CN111314967B - Switching method and device - Google Patents
Switching method and device Download PDFInfo
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- CN111314967B CN111314967B CN201811428151.1A CN201811428151A CN111314967B CN 111314967 B CN111314967 B CN 111314967B CN 201811428151 A CN201811428151 A CN 201811428151A CN 111314967 B CN111314967 B CN 111314967B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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Abstract
The embodiment of the invention provides a switching method and a device, wherein the method comprises the following steps: a source cell receives a measurement report reported by a user terminal, and a preset area to which the user terminal belongs is determined according to the measurement report; acquiring premature switching information corresponding to a preset area; judging whether the premature switching information meets the premature switching condition; if yes, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal, wherein the measurement reconfiguration message is used for indicating the user terminal to execute event measurement again and increasing the trigger duration of the corresponding measurement event to a target duration; and receiving a measurement report reported again by the user terminal, generating a switching message and sending the switching message to the user terminal, wherein the measurement report reported again is generated when the trigger duration of the measurement event reaches the target duration in the process of re-measurement by the user terminal. The embodiment of the invention delays the switching of the user terminal when determining that the user terminal is in the area which is easy to generate premature switching, thereby improving the switching success rate.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a handover method and a handover apparatus.
Background
With the popularization of mobile internet technology and mobile terminals, users can use user terminals to perform various services, such as internet access, video on demand, mail receiving and sending, downloading and the like; during the moving process of the user terminal, the user terminal can be freely switched among the cells so as to keep the communication of the user terminal uninterrupted.
After the user terminal is switched to the target cell, if the signal of the target cell is not good enough, the user terminal may be switched too early, that is, after the user terminal is switched from the source cell to the target cell, a Radio Link Failure (RLF) may not be maintained in a Radio Link between the user terminal and the target cell; thereby reducing the success rate of handover.
Disclosure of Invention
The embodiment of the invention provides a switching method, which improves the switching success rate by avoiding the occurrence of premature switching.
Correspondingly, the embodiment of the invention also provides a switching device for ensuring the realization and the application of the method.
In order to solve the above problem, the present invention discloses a handover method, which specifically includes: a source cell receives a measurement report reported by a user terminal, and determines the position of the user terminal according to the measurement report; determining a preset region to which the user terminal belongs according to the position of the user terminal, wherein the preset region is determined by dividing a signal coverage region of the source cell according to a preset rule; acquiring premature switching information corresponding to the preset area; judging whether the premature switching information meets the premature switching condition; if the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal, wherein the measurement reconfiguration message is used for indicating the user terminal to re-execute event measurement and increasing the trigger duration of the corresponding measurement event to a target duration; receiving a measurement report reported again by the user terminal, generating a switching message and sending the switching message to the user terminal, wherein the measurement report reported again is generated when the trigger duration of the measurement event reaches a target duration in the process of re-measurement by the user terminal; and if the premature switching information does not meet the premature switching condition, generating a switching message and sending the switching message to the user terminal, wherein the switching message is used for indicating the user terminal to switch to a target cell.
Optionally, the determining the location of the ue according to the measurement report includes: determining a cell terminal index identifier of the user terminal according to the measurement report, and searching a Time Advance (TA) and an antenna arrival angle (AOA) corresponding to the user terminal according to the cell terminal index identifier; and determining the position of the user terminal according to the TA and the AOA.
Optionally, the premature handover information includes a premature handover probability, and the acquiring the premature handover information corresponding to the preset area includes: determining a switching cell pair corresponding to the user terminal according to the measurement report, wherein the switching cell pair comprises a source cell and a target cell; and determining the premature switching probability corresponding to the preset area to which the user terminal belongs based on the area identification corresponding to the preset area and the switching cell pair searching mapping relation.
Optionally, the determining whether the premature handover information satisfies a premature handover condition includes: determining whether the premature handover probability is greater than a probability threshold; if the premature handover probability is greater than a probability threshold, determining that the premature handover information meets a premature handover condition; if the premature handover probability is less than a probability threshold, determining that the premature handover information does not satisfy a premature handover condition.
Optionally, the generating a measurement reconfiguration message includes: generating a target time length of the trigger duration corresponding to the measurement event according to the reference time length and the delay time length of the trigger duration corresponding to the measurement event; and generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event.
Optionally, the method further includes the step of establishing the mapping relationship: dividing a signal coverage area of a source cell according to a preset rule, determining a plurality of preset areas and setting corresponding area identifications for the preset areas; aiming at each preset area, determining the premature switching probability of each switching cell pair corresponding to the preset area; and establishing the mapping relation according to the area identification of each preset area, each switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair.
Optionally, the determining the premature handover probability of each handover cell pair corresponding to the preset region includes: determining the premature switching times and the switching request times corresponding to the switching cell pairs aiming at each switching cell pair; and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
Optionally, a premature switching report is obtained, and whether the corresponding historical user terminal is switched prematurely is judged according to the premature switching report; if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report; and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
The embodiment of the invention also discloses a switching device, which specifically comprises: a location determining module, configured to receive, by a source cell, a measurement report reported by a user terminal, and determine, according to the measurement report, a location of the user terminal; the area determining module is used for determining a preset area to which the user terminal belongs according to the position of the user terminal, wherein the preset area is determined by dividing a signal coverage area of the source cell according to a preset rule; the information determining module is used for acquiring premature switching information corresponding to the preset area; the condition judging module is used for judging whether the premature switching information meets the premature switching condition; a reconfiguration message generation module, configured to generate a measurement reconfiguration message and send the measurement reconfiguration message to the ue if the premature handover information meets the premature handover condition, where the measurement reconfiguration message is used to instruct the ue to re-perform event measurement and increase a trigger duration of a corresponding measurement event to a target duration; a first switching message generating module, configured to receive a measurement report re-reported by the ue, generate a switching message, and send the switching message to the ue, where the re-reported measurement report is generated when a trigger duration of the measurement event reaches a target duration in a re-measurement process of the ue; and a second handover message generating module, configured to generate a handover message and send the handover message to the user terminal if the premature handover information does not satisfy the premature handover condition, where the handover message is used to instruct the user terminal to handover to a target cell.
Optionally, the location determining module is specifically configured to determine a cell terminal index identifier of the ue according to the measurement report, and search for a time advance TA and an antenna arrival angle AOA corresponding to the ue according to the cell terminal index identifier; and determining the position of the user terminal according to the TA and the AOA.
Optionally, the premature handover information includes a premature handover probability, and the information determining module is specifically configured to determine, according to the measurement report, a handover cell pair corresponding to the user equipment, where the handover cell pair includes a source cell and a target cell; and determining the premature switching probability corresponding to the preset area to which the user terminal belongs based on the area identification corresponding to the preset area and the switching cell pair searching mapping relation.
Optionally, the condition determining module is specifically configured to determine whether the premature handover probability is greater than a probability threshold; if the premature handover probability is greater than a probability threshold, determining that the premature handover information meets a premature handover condition; if the premature handover probability is less than a probability threshold, determining that the premature handover information does not satisfy a premature handover condition.
Optionally, the reconfiguration message generation module is specifically configured to generate a target duration of the trigger duration corresponding to the measurement event according to the reference duration and the delay duration of the trigger duration corresponding to the measurement event; and generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event.
Optionally, the apparatus further comprises: a relationship establishment module, the relationship establishment module comprising:
the division submodule is used for dividing the signal coverage area of the source cell according to a preset rule, determining a plurality of preset areas and setting corresponding area identifiers for the preset areas; a probability determination submodule, configured to determine, for each preset region, a premature handover probability of each handover cell pair corresponding to the preset region; and the mapping relation establishing submodule is used for establishing the mapping relation according to the area identification of each preset area, each switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair.
Optionally, the probability determining sub-module is specifically configured to determine, for each handover cell pair, a number of premature handover requests and a number of handover requests corresponding to the handover cell pair; and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
Optionally, the apparatus further comprises: the premature switching frequency accumulation module is used for acquiring a premature switching report and judging whether the corresponding historical user terminal is subjected to premature switching according to the premature switching report; if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report; and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, after receiving a measurement report reported by a user terminal, a source cell can determine the position of the user terminal, then determine a preset region to which the user terminal belongs according to the position of the user terminal, and acquire premature switching information corresponding to the preset region; and further, whether the location of the user terminal is an area where premature handover is easy to occur can be determined by judging whether the premature handover information meets the premature handover condition. If the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal so that the user terminal can perform event measurement again, and generating a corresponding measurement report and sending the measurement report to the source cell when the trigger duration corresponding to the measurement event is increased to the target duration; after receiving the measurement report reported again by the user terminal, the source cell generates a switching message and sends the switching message to the user terminal, so that the switching of the user terminal is delayed; therefore, the premature switching of the user terminal is avoided, and the switching success rate is improved.
Drawings
FIG. 1 is a flowchart illustrating the steps of an embodiment of a handover method of the present invention;
fig. 2 is a schematic diagram illustrating a source cell signal coverage area divided into a plurality of preset areas according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating the steps of an alternative embodiment of a handoff method of the present invention;
FIG. 4 is a block diagram of a switching device according to an embodiment of the present invention;
fig. 5 is a block diagram of an alternative apparatus for switching according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
One of the core ideas of the embodiment of the invention is that after receiving a measurement report of a user terminal, a source cell can delay the switching of the user terminal when determining that the position of the user terminal is a position where premature switching is easy to occur, thereby avoiding the occurrence of the premature switching of the user terminal and further improving the success rate of the switching.
Referring to fig. 1, a flowchart illustrating steps of an embodiment of a handover method of the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, the source cell can configure the corresponding measurement event for the user terminal, after the configuration is finished, the user terminal performs the measurement on the corresponding measurement event, and when the measurement result meets the trigger condition of the measurement event, a corresponding measurement report can be generated and reported to the source cell; the source cell may refer to a cell that provides a service for a user terminal. In an embodiment of the present invention, the measurement event may include at least one of: an a1 event, an a2 event, an A3 event, an a4 event, an a5 event, a B1 event, and a B2 event; of course, other measurement events may be included, without limitation; wherein, the measurement executed by the user terminal is different in different measurement events; for example, when the source cell configures an a1 event for the user equipment, the user equipment needs to measure whether the signal quality of the source cell is higher than a certain threshold; when the signal quality of the source cell is higher than a certain threshold, the triggering condition of an A1 event is met, and a measurement report of the A1 event can be generated and uploaded; for another example, when the source cell configures an a3 event for the user equipment, the user equipment needs to measure whether the signal quality corresponding to the neighboring cell of the source cell is higher than that of the source cell; when the signal measurement corresponding to the neighboring cell is higher than the signal quality of the source cell, it is determined that the trigger condition of the A3 event is satisfied, and a measurement report of the A3 event may be generated and uploaded. In this embodiment of the present invention, the measurement report uploaded by the user may be a measurement report used for requesting handover, such as measurement reports corresponding to an A3 event, an a4 event, an a5 event, a B1 event, and a B2 event.
The source cell may then receive a measurement report of the ue, and then decide whether to switch the ue to a cell corresponding to the measurement report (which may be referred to as a target cell) according to the measurement report. In the embodiment of the invention, in order to avoid the user terminal from being switched to the target cell prematurely, whether the user terminal is in an area which is easy to be switched prematurely can be judged, if so, the switching of the user terminal can be delayed, and if not, the user terminal can be switched; therefore, the embodiment of the present invention can obtain the position of the user terminal, and then judge the position of the user terminal, wherein the position of the user terminal can be searched according to the cell radio network temporary identifier corresponding to the user terminal in the measurement report.
And step 102, determining a preset region to which the user terminal belongs according to the position of the user terminal, wherein the preset region is determined by dividing the signal coverage region of the source cell according to a preset rule.
And 103, acquiring premature switching information corresponding to the preset area.
And step 104, judging whether the premature switching information meets the premature switching condition.
In the embodiment of the present invention, the source cell signal coverage area may be divided into a plurality of preset areas according to a preset rule in advance, where the preset rule may be set as required; then, according to the premature switching condition of the historical user terminal in each preset area, determining the premature switching information corresponding to each preset area; the premature handover information corresponding to each preset area is determined to be explained later, and the historical user terminals in the preset area may refer to all the user terminals which are in the preset area before the current time and are accessed to the source cell. And then, according to the position of the user terminal, determining a preset region to which the user terminal belongs, and then, acquiring premature handover information corresponding to the preset region to which the user terminal belongs, so as to judge whether the user terminal is in a region where premature handover is easy to occur according to the premature handover information corresponding to the preset region to which the user terminal belongs.
Wherein, whether the user terminal is in an area where premature handover is easy to occur can be judged by judging whether the premature handover information meets the premature handover condition; if the premature handover information meets the premature handover condition, determining that the user equipment is in an area where the premature handover is likely to occur, and performing step 105, wherein the handover of the user equipment can be delayed; if the premature handover information does not satisfy the premature handover condition, it is determined that the ue is in an area where the premature handover is not likely to occur, so that the ue can perform handover, and step 107 is performed.
And 105, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the ue, where the measurement reconfiguration message is used to instruct the ue to perform event measurement again and increase the trigger duration of the corresponding measurement event to a target duration.
And 106, receiving a measurement report reported again by the user terminal, generating a switching message and sending the switching message to the user terminal, wherein the measurement report reported again is generated when the trigger duration of the measurement event reaches a target duration in the process of re-measurement by the user terminal.
In the embodiment of the present invention, when it is determined that the premature handover information satisfies the premature handover condition, a measurement reconfiguration message may be generated, where the measurement reconfiguration message may instruct the user terminal to perform event measurement again, and increase the trigger duration corresponding to the measurement event to a target duration; the trigger duration of the measurement event may refer to a duration of the trigger measurement event. And then, sending the measurement reconfiguration message to the user terminal, so that the user terminal can perform measurement on a measurement event corresponding to the measurement reconfiguration message after receiving the measurement reconfiguration message. When the user terminal determines that the trigger duration of the measurement event corresponding to the measurement reconfiguration message reaches the target duration, it may be determined that the signal of the target cell tends to be stable, and at this time, a measurement report may be generated and reported to the source cell. The target duration may be set as required, and is greater than the reference duration corresponding to the measurement event corresponding to the measurement reconfiguration message. And then after determining that the signal of the target cell tends to be stable, sending a measurement report to the source cell to request switching, so that the success rate of accessing the target cell by the user terminal can be improved.
The source cell can then receive the measurement report reported again by the user terminal, and at this time, a corresponding handover message can be generated and then sent to the user terminal; and the user terminal can switch to the target cell after receiving the switching message.
And 107, generating a switching message and sending the switching message to the user terminal, wherein the switching message is used for indicating the user terminal to switch to a target cell.
In the embodiment of the invention, when the premature switching information is determined not to meet the premature switching condition, the premature switching information can be converted into the switching information and sent to the user terminal, and then the user terminal can be switched to the target cell according to the switching information.
In the embodiment of the invention, after receiving a measurement report reported by a user terminal, a source cell can determine the position of the user terminal, then determine a preset region to which the user terminal belongs according to the position of the user terminal, and acquire premature switching information corresponding to the preset region; and further, whether the location of the user terminal is an area where premature handover is easy to occur can be determined by judging whether the premature handover information meets the premature handover condition. If the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal so that the user terminal can perform event measurement again, and generating a corresponding measurement report and sending the measurement report to the source cell when the trigger duration corresponding to the measurement event is increased to the target duration; after receiving the measurement report reported again by the user terminal, the source cell generates a switching message and sends the switching message to the user terminal, so that the switching of the user terminal is delayed; therefore, the premature switching of the user terminal is avoided, and the switching success rate is improved.
In another embodiment of the present invention, the premature handover information includes a premature handover probability, and the method further includes the step of establishing the mapping relationship: dividing a signal coverage area of a source cell according to a preset rule, determining a plurality of preset areas and setting corresponding area identifications for the preset areas; aiming at each preset area, determining the premature switching probability of a switching cell pair corresponding to the preset area; and establishing the mapping relation according to the area identification of each preset area, the switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair. And then, the mapping relation can be searched according to the identifier of the preset area to which the user terminal belongs, and the premature switching probability of the preset area to which the user terminal belongs is determined. In one example of the present invention, referring to fig. 2, the signal coverage area of the source cell is divided into a plurality of preset areas, which are respectively numbered as 1, 2, and ….
In an example of the present invention, the determining the probability of premature handover of each handover cell pair corresponding to the preset region may include the following sub-steps:
substep S11: determining the premature switching times and the switching request times corresponding to the switching cell pairs aiming at each switching cell pair;
substep S12: and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
In the embodiment of the invention, the premature switching times of each switching cell pair corresponding to each preset area can be accumulated according to the premature switching report corresponding to the historical terminal of the source cell; may include the following substeps:
substep S31: acquiring a premature switching report, and judging whether the corresponding historical user terminal is subjected to premature switching according to the premature switching report;
substep S32: if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report;
substep S33: and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
The historical user terminal may send an RRC (Radio Resource Control) connection reestablishment request to the source cell, or may send an RRC connection reestablishment request to a neighboring cell of the source cell. When a source cell receives an RRC connection reestablishment request sent by a historical user terminal, an rlfinal (Radio Link Failure indication) message may be obtained from the RRC connection reestablishment request; the internal too early handover report is then generated according to the RLFindication message and may be referred to as an internal handover report. The RLFindication may include a physical Cell id (physical Cell identity) and a c-RNTI (Cell Radio Network Temporary Identifier) of the target Cell. After an internal Handoverreport is generated in a source cell, a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal can be determined; wherein the handover cell pair includes a source cell and a target cell. And then generating a handover cell pair according to the physical cell identifier of the source cell and the physical cell identifier of the target cell, such as a representation mode: [ physcellld of source cell, physcellld of target cell ]. Determining a cell terminal index identifier according to the c-RNTI corresponding to the historical user terminal; then, searching a time advance TA and an antenna arrival angle AOA corresponding to the historical user terminal according to the cell terminal index identifier; and determining the position of the historical user terminal according to the TA and the AOA. And then determining the preset region of the historical user terminal according to the position of the historical user terminal. And adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area. Further, a predetermined area may include multiple premature handover probabilities, one handover probability corresponding to a handover cell pair. For example, in fig. 2, the predetermined region 1 includes three premature handover probabilities: source cell A, target cell B-0.6, source cell A, target cell C-0.7, source cell A, target cell D-0.3.
After the neighboring cell of the source cell receives the RRC connection reestablishment request, an external early handover report may be generated according to the RLFindication message in the RRC connection reestablishment request, and the external early handover report may be referred to as an external handover, and then the external handover is sent to the source cell. And after receiving the external Handoverport, the source cell can judge whether the type corresponding to the external Handoverport is a too early switching type, and if so, the source cell can execute the determination of the preset region to which the historical user terminal belongs, the switching cell corresponding to the historical user terminal, the steps and the subsequent steps. If not, the external Handoverport can be ignored, or other processing is performed on the external Handoverport; the embodiments of the present invention are not limited in this regard.
In the embodiment of the invention, in the process of establishing the mapping relation, the signal coverage area of the source cell is divided according to a preset rule, a plurality of preset areas are determined, and corresponding area identifiers are set for the preset areas; aiming at each preset area, determining the premature switching probability of a switching cell pair corresponding to the preset area; and establishing the mapping relation according to the area identification of each preset area, the switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair. Each switching cell pair in each preset region corresponds to one premature switching probability, different premature switching probabilities can be adopted for user terminals of different switching cells, the premature switching probabilities of the preset regions are refined, and therefore the accuracy of avoiding the premature switching is further improved, and the switching success rate is further improved.
In another embodiment of the present invention, how the source cell delays the handover of the ue will be described in detail.
Referring to fig. 3, a flowchart illustrating steps of an alternative embodiment of a handover method according to the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, after receiving a measurement report reported by a user terminal, a source cell can judge whether the user terminal is allowed to be switched to a corresponding target cell; in order to avoid the user terminal performing premature handover, the location of the user terminal may be determined, and whether the user terminal is in an area where the premature handover is likely to occur is determined; if the user terminal is determined to be in the area where the premature handover is likely to occur, the handover of the user terminal may be delayed, and if the user terminal is determined to be in the area where the premature handover is not likely to occur, the user terminal may be handed over.
Wherein the step of determining the location of the user terminal may include steps 302-303:
step 302, determining a cell terminal index id of the ue according to the measurement report, and searching for a timing advance TA and an antenna arrival angle AOA corresponding to the ue according to the cell terminal index id.
In the embodiment of the invention, the measurement report comprises the c-RNTI corresponding to the user terminal, so the c-RNTI can be obtained from the measurement report, and then the cell terminal index identifier corresponding to the user terminal is determined according to the c-RNTI. Searching corresponding TA (Timing Advance) and AOA (Arrival Angle of antenna) from the cache of the source cell according to the cell terminal index identifier; and further, the position of the user terminal can be determined according to the TA and the AOA.
And step 304, determining a preset area to which the user terminal belongs according to the position of the user terminal.
After the position of the user terminal is determined, the preset region corresponding to the user terminal and the corresponding region identifier may be determined according to the range information corresponding to each preset region.
Step 305, determining a handover cell pair corresponding to the user equipment according to the measurement report, where the handover cell pair includes a source cell and a target cell.
In the embodiment of the invention, a preset area corresponds to the premature switching probability corresponding to a plurality of switching cells, so that the target cell corresponding to the switching of the user terminal can be determined according to the measurement report; and then taking the source cell and the target cell as a switching cell pair of the user terminal. Then, a mapping relation generated in advance is obtained, according to the area identifier of the preset area of the user terminal and the mapping relation searched by the switching cell pair, a premature switching probability corresponding to the switching cell pair in the preset area to which the user terminal belongs (which may be referred to as the premature switching probability corresponding to the preset area to which the user terminal belongs) is obtained and determined, and the premature switching probability is determined as the premature switching information. It may then be determined whether the premature handover information satisfies the premature handover condition, and refer to step 307:
and 307, judging whether the premature switching probability is greater than a probability threshold value.
Then, whether the premature handover information meets the premature handover condition can be judged by judging whether the probability of the premature handover corresponding to the handover cell in the preset area to which the user terminal belongs is greater than a probability threshold; if the premature handover probability is greater than the probability threshold, it is determined that the premature handover information satisfies the premature handover condition, step 308 may be executed, and if the premature handover probability is less than the probability threshold, it is determined that the premature handover information does not satisfy the premature handover condition, step 311 may be executed. Wherein the probability threshold can be set according to requirements.
And 308, generating a target duration of the trigger duration corresponding to the measurement event according to the reference duration and the delay duration of the trigger duration corresponding to the measurement event.
Step 310, receiving a measurement report re-reported by the ue, generating a handover message and sending the handover message to the ue, wherein the re-reported measurement report is generated when the trigger duration of the measurement event reaches a target duration.
When the premature switching probability is determined to be greater than the probability threshold, the reference duration and the delay duration of the trigger duration corresponding to the measurement event can be obtained, and the sum of the reference duration and the delay duration is determined as the target duration; and then generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event. Wherein, the delay time length can be set according to requirements.
And after receiving the measurement reconfiguration message, the ue may perform measurement on a measurement event corresponding to the measurement reconfiguration message. When the user terminal determines that the trigger duration of the measurement event corresponding to the measurement reconfiguration message reaches the target duration, it may be determined that the signal of the target cell tends to be stable, and at this time, a measurement report may be generated and reported to the source cell. Therefore, after the signal of the target cell tends to be stable, the measurement report is sent to the source cell to request switching, and the success rate of the user terminal accessing the target cell can be improved.
The source cell may receive the measurement report reported again by the user terminal, and at this time, may generate a corresponding handover message, and then send the handover message to the user terminal; and the user terminal can switch to the target cell after receiving the switching message.
In the embodiment of the invention, when the premature switching information is determined not to meet the premature switching condition, the premature switching information can be converted into the switching information and sent to the user terminal, and then the user terminal can be switched to the target cell according to the switching information.
In the embodiment of the invention, after receiving a measurement report reported by a user terminal, a source cell can determine the position of the user terminal, then determine a preset region to which the user terminal belongs according to the position of the user terminal, and acquire premature switching information corresponding to the preset region; and further, whether the location of the user terminal is an area where premature handover is easy to occur can be determined by judging whether the premature handover information meets the premature handover condition. If the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal so that the user terminal can perform event measurement again, and generating a corresponding measurement report and sending the measurement report to the source cell when the trigger duration corresponding to the measurement event is increased to the target duration; after receiving the measurement report reported again by the user terminal, the source cell generates a switching message and sends the switching message to the user terminal, so that the switching of the user terminal is delayed; therefore, the premature switching of the user terminal is avoided, and the switching success rate is improved.
Secondly, in the embodiment of the present invention, a cell terminal index identifier of the user terminal may be determined according to the measurement report, and a time advance TA and an antenna arrival angle AOA corresponding to the user terminal may be searched according to the cell terminal index identifier; and determining the position of the user terminal according to the TA and the AOA. And then improve and confirm the accuracy of the said user terminal position, thus further raise and avoid the accuracy rate of switching over prematurely, and further raise and switch over the success rate.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 4, a block diagram of a switching device according to an embodiment of the present invention is shown, which may specifically include the following modules:
a location determining module 401, configured to receive, by a source cell, a measurement report reported by a user equipment, and determine a location of the user equipment according to the measurement report;
a region determining module 402, configured to determine a preset region to which the user terminal belongs according to the position of the user terminal, where the preset region is determined by dividing a signal coverage region of the source cell according to a preset rule;
an information determining module 403, configured to obtain premature handover information corresponding to the preset area;
a condition determining module 404, configured to determine whether the premature handover information satisfies a premature handover condition;
a reconfiguration message generation module 405, configured to generate a measurement reconfiguration message and send the measurement reconfiguration message to the ue if the premature handover information meets the premature handover condition, where the measurement reconfiguration message is used to instruct the ue to re-perform event measurement and increase the trigger duration of the corresponding measurement event to a target duration;
a first switching message generating module 406, configured to receive a measurement report re-reported by the ue, generate a switching message, and send the switching message to the ue, where the re-reported measurement report is generated when a trigger duration of the measurement event reaches a target duration in a re-measurement process of the ue;
a second handover message generating module 407, configured to generate a handover message and send the handover message to the user equipment if the premature handover information does not satisfy the premature handover condition, where the handover message is used to instruct the user equipment to handover to a target cell.
Referring to fig. 5, a block diagram of an alternative embodiment of the switching device of the present invention is shown, and specifically, the structure may include the following modules:
in another embodiment of the present invention, the location determining module 401 is specifically configured to determine a cell terminal index identifier of the ue according to the measurement report, and search for a timing advance TA and an antenna arrival angle AOA corresponding to the ue according to the cell terminal index identifier; and determining the position of the user terminal according to the TA and the AOA.
In another embodiment of the present invention, the information determining module 403 is specifically configured to determine, according to the measurement report, a handover cell pair corresponding to the user equipment, where the handover cell pair includes a source cell and a target cell; and determining the premature switching probability corresponding to the preset area to which the user terminal belongs based on the area identification corresponding to the preset area and the switching cell pair searching mapping relation.
In another embodiment of the present invention, the condition determining module 404 is specifically configured to determine whether the premature handover probability is greater than a probability threshold; if the premature handover probability is greater than a probability threshold, determining that the premature handover information meets a premature handover condition; if the premature handover probability is less than a probability threshold, determining that the premature handover information does not satisfy a premature handover condition.
In another embodiment of the present invention, the reconfiguration message generating module 405 is specifically configured to generate a target duration of the trigger duration corresponding to the measurement event according to the reference duration and the delay duration of the trigger duration corresponding to the measurement event; and generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event.
In another embodiment of the present invention, the apparatus further comprises: the relationship-establishing module 408 is configured to establish,
the relationship establishing module 408 includes:
the dividing submodule 4081 is configured to divide the signal coverage area of the source cell according to a preset rule, determine a plurality of preset areas, and set a corresponding area identifier for each preset area;
a probability determination submodule 4082, configured to determine, for each preset region, a premature handover probability of each handover cell pair corresponding to the preset region;
the mapping relation establishing submodule 4083 is configured to establish the mapping relation according to the area identifier of each preset area, each handover cell pair corresponding to the preset area, and the premature handover probability of the handover cell pair.
In another embodiment of the present invention, the probability determining sub-module 4082 is specifically configured to determine, for each handover cell pair, the number of premature handovers and the number of handover requests corresponding to the handover cell pair; and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
In another embodiment of the present invention, the apparatus includes a premature handover times accumulation module 409, configured to obtain a premature handover report, and determine whether a corresponding historical ue has a premature handover according to the premature handover report; if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report; and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
In the embodiment of the invention, after receiving a measurement report reported by a user terminal, a source cell can determine the position of the user terminal, then determine a preset region to which the user terminal belongs according to the position of the user terminal, and acquire premature switching information corresponding to the preset region; and further, whether the location of the user terminal is an area where premature handover is easy to occur can be determined by judging whether the premature handover information meets the premature handover condition. If the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal so that the user terminal can perform event measurement again, and generating a corresponding measurement report and sending the measurement report to the source cell when the trigger duration corresponding to the measurement event is increased to the target duration; after receiving the measurement report reported again by the user terminal, the source cell generates a switching message and sends the switching message to the user terminal, so that the switching of the user terminal is delayed; therefore, the premature switching of the user terminal is avoided, and the switching success rate is improved.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The foregoing describes in detail a switching method and a switching device provided by the present invention, and specific examples are applied in the present disclosure to explain the principle and the implementation of the present invention, and the descriptions of the foregoing embodiments are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (16)
1. A method of handover, comprising:
a source cell receives a measurement report reported by a user terminal, and determines the position of the user terminal according to the measurement report;
determining a preset region to which the user terminal belongs according to the position of the user terminal, wherein the preset region is determined by dividing a signal coverage region of the source cell according to a preset rule;
acquiring premature switching information corresponding to the preset area;
judging whether the premature switching information meets the premature switching condition;
if the premature handover information meets the premature handover condition, generating a measurement reconfiguration message and sending the measurement reconfiguration message to the user terminal, wherein the measurement reconfiguration message is used for indicating the user terminal to re-execute event measurement and increasing the trigger duration of the corresponding measurement event to a target duration; receiving a measurement report reported again by the user terminal, generating a switching message and sending the switching message to the user terminal, wherein the measurement report reported again is generated when the trigger duration of the measurement event reaches a target duration in the process of re-measurement by the user terminal;
and if the premature switching information does not meet the premature switching condition, generating a switching message and sending the switching message to the user terminal, wherein the switching message is used for indicating the user terminal to switch to a target cell.
2. The method of claim 1, wherein the determining the location of the ue according to the measurement report comprises:
determining a cell terminal index identifier of the user terminal according to the measurement report, and searching a Time Advance (TA) and an antenna arrival angle (AOA) corresponding to the user terminal according to the cell terminal index identifier;
and determining the position of the user terminal according to the TA and the AOA.
3. The method according to claim 1, wherein the premature handover information includes a premature handover probability, and the obtaining the premature handover information corresponding to the preset area includes:
determining a switching cell pair corresponding to the user terminal according to the measurement report, wherein the switching cell pair comprises a source cell and a target cell;
and determining the premature switching probability corresponding to the preset area to which the user terminal belongs based on the area identification corresponding to the preset area and the switching cell pair searching mapping relation.
4. The method of claim 3, wherein said determining whether the premature handover information satisfies a premature handover condition comprises:
determining whether the premature handover probability is greater than a probability threshold;
if the premature handover probability is greater than a probability threshold, determining that the premature handover information meets a premature handover condition;
if the premature handover probability is less than a probability threshold, determining that the premature handover information does not satisfy a premature handover condition.
5. The method of claim 1, wherein generating the measurement reconfiguration message comprises:
generating a target time length of the trigger duration corresponding to the measurement event according to the reference time length and the delay time length of the trigger duration corresponding to the measurement event;
and generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event.
6. The method of claim 3, further comprising the step of establishing said mapping relationship:
dividing a signal coverage area of a source cell according to a preset rule, determining a plurality of preset areas and setting corresponding area identifications for the preset areas;
aiming at each preset area, determining the premature switching probability of each switching cell pair corresponding to the preset area;
and establishing the mapping relation according to the area identification of each preset area, each switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair.
7. The method of claim 6, wherein the determining the probability of premature handover of each handover cell pair corresponding to the predetermined area comprises:
determining the premature switching times and the switching request times corresponding to the switching cell pairs aiming at each switching cell pair;
and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
8. The method of claim 7, further comprising:
acquiring a premature switching report, and judging whether the corresponding historical user terminal is subjected to premature switching according to the premature switching report;
if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report;
and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
9. A switching device, comprising:
a location determining module, configured to receive, by a source cell, a measurement report reported by a user terminal, and determine, according to the measurement report, a location of the user terminal;
the area determining module is used for determining a preset area to which the user terminal belongs according to the position of the user terminal, wherein the preset area is determined by dividing a signal coverage area of the source cell according to a preset rule;
the information determining module is used for acquiring premature switching information corresponding to the preset area;
the condition judging module is used for judging whether the premature switching information meets the premature switching condition;
a reconfiguration message generation module, configured to generate a measurement reconfiguration message and send the measurement reconfiguration message to the ue if the premature handover information meets the premature handover condition, where the measurement reconfiguration message is used to instruct the ue to re-perform event measurement and increase a trigger duration of a corresponding measurement event to a target duration;
a first switching message generating module, configured to receive a measurement report re-reported by the ue, generate a switching message, and send the switching message to the ue, where the re-reported measurement report is generated when a trigger duration of the measurement event reaches a target duration in a re-measurement process of the ue;
and a second handover message generating module, configured to generate a handover message and send the handover message to the user terminal if the premature handover information does not satisfy the premature handover condition, where the handover message is used to instruct the user terminal to handover to a target cell.
10. The apparatus of claim 9,
the location determining module is specifically configured to determine a cell terminal index identifier of the ue according to the measurement report, and search for a time advance TA and an antenna arrival angle AOA corresponding to the ue according to the cell terminal index identifier; and determining the position of the user terminal according to the TA and the AOA.
11. The apparatus of claim 9, wherein the premature handover information comprises a premature handover probability,
the information determining module is specifically configured to determine, according to the measurement report, a handover cell pair corresponding to the user equipment, where the handover cell pair includes a source cell and a target cell; and determining the premature switching probability corresponding to the preset area to which the user terminal belongs based on the area identification corresponding to the preset area and the switching cell pair searching mapping relation.
12. The apparatus of claim 11,
the condition judgment module is specifically used for judging whether the premature switching probability is greater than a probability threshold value; if the premature handover probability is greater than a probability threshold, determining that the premature handover information meets a premature handover condition; if the premature handover probability is less than a probability threshold, determining that the premature handover information does not satisfy a premature handover condition.
13. The apparatus of claim 9,
the reconfiguration message generation module is specifically used for generating a target duration of the trigger duration corresponding to the measurement event according to the reference duration and the delay duration of the trigger duration corresponding to the measurement event; and generating a measurement reconfiguration message according to the target duration of the trigger duration corresponding to the measurement event.
14. The apparatus of claim 11, further comprising: a relationship establishing module for establishing a relationship between the first and second network nodes,
the relationship establishing module comprises:
the division submodule is used for dividing the signal coverage area of the source cell according to a preset rule, determining a plurality of preset areas and setting corresponding area identifiers for the preset areas;
a probability determination submodule, configured to determine, for each preset region, a premature handover probability of each handover cell pair corresponding to the preset region;
and the mapping relation establishing submodule is used for establishing the mapping relation according to the area identification of each preset area, each switching cell pair corresponding to the preset area and the premature switching probability of the switching cell pair.
15. The apparatus of claim 14,
the probability determination submodule is specifically configured to determine, for each handover cell pair, the number of premature handover times and the number of handover requests corresponding to the handover cell pair; and calculating the ratio of the premature switching times to the switching request times to obtain the premature switching probability of the switching cell pair.
16. The apparatus of claim 15, further comprising:
the premature switching frequency accumulation module is used for acquiring a premature switching report and judging whether the corresponding historical user terminal is subjected to premature switching according to the premature switching report; if the historical user terminal is determined to be switched prematurely, determining a preset area to which the historical user terminal belongs and a switching cell pair corresponding to the historical user terminal according to the premature switching report; and adding 1 to the premature switching times of the switching cells corresponding to the historical user terminal, and establishing the corresponding relation between the switching cells corresponding to the historical user terminal and the belonged preset area.
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| CN102196485A (en) * | 2010-03-09 | 2011-09-21 | 中兴通讯股份有限公司 | Method and system for reducing unnecessary switching in LTE (Long Term Evolution) system |
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