CN103124417A - Method, device and system for performing handover decision on user equipment - Google Patents
Method, device and system for performing handover decision on user equipment Download PDFInfo
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- 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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Abstract
An embodiment of the invention provides a method, device and system for performing handover decision on user equipment (UE). The method mainly comprises: a base station where a serving cell belongs to transmits unified time to trigger (TTT) values set targeting at least one neighboring cell to the UE, the base station of the serving cell receives a measurement report containing identification information of the neighboring cell and reported by the UE, wherein the identification information of the neighboring cell is obtained by enabling the UE to changing-over corresponding measurements according to the TTT values; and the base station of the serving cell obtains the size information of the neighboring cell and performs handover decision targeting the UE according to the size information and the set handover decision strategy. By means of the method, device and system for performing handover decision on UE, unified smaller TTT values are configured on macrocells and microcells, and the technical scheme can be used by all the existing UE without changing the current standards.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, and a system for performing handover decision on a UE (User Equipment).
Background
Heterogeneous networks, such as hetnets, are being gradually introduced into next generation wireless networks as a new network deployment. In HetNet, some low power nodes are deployed in the coverage of Macro cell (Macro cell), which may be one or more of RRH (Remote Radio Head), small base station (Pico eNB), HeNB (Home eNB, Home base station), RN (Relay Node), and wireless local area network access point (WiFi AP, for example), and the cells of these low power nodes may be called small cells (Micro/Pico/Femto cell) because the coverage is smaller than the Macro cell. The macro cell provides seamless coverage for the UE, and the small cell improves the capacity of the system.
In the prior art, a method for performing handover decision on UE includes: the base station to which the serving cell belongs judges the size of each neighbor cell according to some priori information, and selects different TTT (time to trigger) values for each neighbor cell according to the size of each neighbor cell. For example, the large TTT value for the macro cell may be represented by TTTbig, and the small TTT value for the small cell may be represented by TTTsmall. And the base station to which the serving cell belongs sends the TTT value of each adjacent cell to the UE.
If the UE measures that an adjacent cell always satisfies the entry condition of the a3 measurement event in the corresponding TTT, that is, the signal strength or the signal quality of the adjacent cell is always higher than the signal strength or the signal quality of the serving cell in the corresponding TTT and reaches a set threshold, the UE reports the identifier of the adjacent cell to the base station to which the serving cell belongs using a measurement reporting process.
And after receiving the adjacent cell reported by the UE, the base station to which the serving cell belongs carries out switching judgment on the adjacent cell so as to determine whether to switch U E to the adjacent cell.
The method for performing handover decision on UE in the prior art at least has the following problems: in the prior art, a base station to which a serving cell belongs configures the same TTT value for different cells of the same U E, which easily causes inaccuracy of handover decision.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, and a system for making a handover decision for U E, so as to enable the handover decision to be more accurate when a uniform TTT value is configured for at least one neighboring cell.
A method for making switching decision for user equipment, wherein a base station to which a serving cell belongs sends a set unified trigger time value for at least one neighbor cell to the user equipment, comprises:
a base station to which a serving cell belongs receives a measurement report which is reported by user equipment and contains identification information of an adjacent cell, wherein the identification information of the adjacent cell is obtained after the user equipment performs switching related measurement according to the trigger time value, and the base station to which the serving cell belongs obtains the size information of the adjacent cell according to the identification information of the adjacent cell;
and the base station to which the serving cell belongs carries out switching judgment aiming at the user equipment according to the size information of the adjacent cell and a set switching judgment strategy.
An apparatus for making a handover decision for a user equipment, the apparatus comprising:
a trigger time value processing module, configured to set a uniform trigger time value for at least one neighboring cell of the ue, and send the trigger time value to the ue;
a measurement report receiving module, configured to receive a measurement report that includes identification information of a neighboring cell and is reported by user equipment, where the identification information of the neighboring cell is obtained after the user equipment performs handover-related measurement according to the trigger time value;
and the measurement report judgment module is used for acquiring the size information of the adjacent cell according to the identification information of the adjacent cell received by the measurement report receiving module, and performing switching judgment aiming at the user equipment according to the size information of the adjacent cell and a set switching judgment strategy.
A user equipment, comprising:
an information receiving module, configured to receive a uniform trigger time value for at least one neighboring cell of the ue, where the uniform trigger time value is issued by a base station to which a serving cell belongs, and the trigger time value is determined according to a size of a neighboring cell with a smallest area in all neighboring cells of the serving cell;
and the measurement reporting processing module is used for performing switching related measurement according to the trigger time value to obtain the identification information of the adjacent cell, and reporting a measurement report containing the identification information of the adjacent cell to the base station to which the serving cell belongs.
A system for making a handover decision for a user equipment comprises the apparatus and the user equipment.
As can be seen from the technical solutions provided by the embodiments of the present invention, the embodiments of the present invention implement that a uniform smaller TTT value is configured for both a macro cell and a small cell, and the technical solutions can be used by existing UEs without changing the existing standards.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a processing flow chart of a method for making a handover decision for a UE according to an embodiment of the present invention;
fig. 2 is a detailed structural diagram of a device for performing handover decision on a UE according to a second embodiment of the present invention;
fig. 3 is a specific structure diagram of a UE according to a second embodiment of the present invention;
fig. 4 is a specific structural diagram of a system for performing handover decision on a UE according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Example one
The processing flow of the method for making a handover decision for a UE provided in this embodiment is shown in fig. 1, and includes the following processing steps:
and step 11, the base station to which the serving cell belongs sends the set value of the unified TTT aiming at least one adjacent cell to the UE.
Specifically, the value of the TTT may be set by comprehensively considering the size of the neighboring cell with the smallest area, the size of the serving cell, a set handover failure rate of the entire network, and a ping-pong handover rate. When the serving cell itself is a small cell, a relatively small value of the above TTT may be set.
In practical applications, the value of TTT may be set to 40 ms.
The reporting period T is used to instruct the UE to report the measurement report periodically according to the reporting period T.
And the base station to which the serving cell belongs sends the value of the TTT and the reporting period T of the measurement report to the UE.
And step 12, the base station to which the serving cell belongs receives a measurement report containing information of the neighbor cell reported by the UE.
After receiving the TTT value and the reporting period T of the measurement report, the UE measures the signal strength or signal quality of each neighboring cell according to an A3 measurement event specified by the 3GPP protocol, and if the UE measures that an adjacent cell always satisfies the entry condition of the A3 measurement event within the time period of the TTT value, that is, the signal strength or quality of the adjacent cell is always higher than that of the serving cell or reaches a set threshold value within the time period of the TTT value, the UE sends the measurement report including the identification information of the adjacent cell to the base station to which the serving cell belongs by using a measurement reporting process.
If the UE measures that the neighboring cells always satisfy the entry condition of the a3 measurement event within the time period of the TTT value, the UE sends a measurement report containing the identification information of the neighboring cells to the base station to which the serving cell belongs by using a measurement reporting process.
The operation of sending the measurement report to the base station to which the serving cell belongs by the UE is periodically repeated according to the reporting period T of the measurement report, that is, the UE immediately starts the timing operation of the reporting period T after the measurement report is sent for the first time, and after the timing is finished, the measurement report is sent again, and then the timing operation of the reporting period T is started again, and the operation is repeated.
In the timing process of the reporting period T, if the UE detects that the new neighboring cell satisfies the entry condition of the a3 measurement event, the UE sends a measurement report including the identification information of the new neighboring cell to the base station to which the serving cell belongs by using a measurement reporting process. And then, resetting the timing of the previous reporting period T to 0, restarting the timing operation of the reporting period T, and after the timing is finished, sending the measurement report containing the identification information of the new neighbor cell and the previously reported neighbor cell again.
And step 13, the base station to which the serving cell belongs acquires the size information of the neighboring cell according to the identification information of the neighboring cell, and decides the UE according to the size information of the neighboring cell and a set switching decision strategy.
The base station to which the serving cell belongs obtains size information of the neighboring cell according to the identification information and prior information of the neighboring cell, where the prior information includes cell-related information configured by an OAM (Operation administration and Maintenance) system and/or UE history information received by the base station to which the serving cell belongs when the UE is switched to the serving cell, the cell-related information includes information such as the size and coverage of each cell, and the UE history information includes size information of a cell where the UE recently resides.
When the base station to which the serving cell belongs determines that the neighboring cell is a small cell according to the size information of the neighboring cell, the base station to which the serving cell belongs immediately performs a handover decision on the neighboring cell for the UE.
When the base station to which the serving cell belongs determines that the neighboring cell is a macro cell according to the size information of the neighboring cell, the base station to which the serving cell belongs delays the handover decision of the neighboring cell, and continues to receive the measurement report periodically reported by the UE, and when the number of times that the base station to which the serving cell belongs receives the measurement report including the neighboring cell reaches a set value N, the base station to which the serving cell belongs performs the handover decision of the neighboring cell for the UE. Therefore, although the embodiment of the present invention issues a uniform TTT value to the UE, the TTT value actually used for performing the handover decision for the macro cell is TTT + n*T, wherein N is [0, N-1 ]]The random number n is a random number within a range, and the reporting period T of the UE may be reset to 0 at any time.
As can be seen from the technical solutions provided by the embodiments of the present invention, the embodiments of the present invention implement that a uniform smaller TTT value is configured for both a macro cell and a small cell, and the technical solutions can be used by existing UEs without changing the existing standards.
The embodiment of the invention also sets the measurement reporting process of the UE to be periodic by adopting different switching judgment strategies aiming at the macro cell and the small cell, so that the actual effective TTT values of the target cells are different when the target cells are the macro cell and the small cell, thereby reducing the failure rate of switching the UE to the small cell on one hand, and keeping the ping-pong switching probability of the whole network below an acceptable threshold on the other hand.
Example two
An embodiment of the present invention further provides a device for making a handover decision for a UE, where the device is disposed in a base station to which a serving cell of the UE belongs, and a specific structure of the device is shown in fig. 2, where the device specifically includes:
a TTT value processing module 21, configured to set a uniform TTT value for at least one neighboring cell of the UE, and send the TTT value to the UE;
a measurement report receiving module 22, configured to receive a measurement report that includes identification information of a neighboring cell and is reported by the UE, where the neighboring cell is obtained after the UE performs handover-related measurement according to the TTT value;
a measurement report decision module 22, configured to obtain size information of the neighboring cell according to the identifier information of the neighboring cell received by the measurement report receiving module 22, and perform a handover decision for the UE according to the size information of the neighboring cell and a set handover decision policy.
The TTT value processing module 21 is further configured to set a uniform TTT value and a reporting period of a measurement report for at least one neighboring cell of the UE, where the TTT value is determined according to a size of a neighboring cell with a smallest area in all neighboring cells of the serving cell, and specifically, the TTT value may be set by comprehensively considering the size of the neighboring cell with the smallest area, the size of the serving cell, a set handover failure rate of the entire network, and a ping-pong handover rate. When the serving cell itself is a small cell, a relatively small value of the above TTT may be set. The reporting period is used for indicating the UE to report the measurement report periodically; and sending the TTT value and the reporting period of the measurement report to the UE.
Specifically, the measurement report determining module 22 is further configured to obtain size information of the neighboring cell according to the identifier information of the neighboring cell and the prior information received by the measurement report receiving module, where the prior information includes relevant information of each cell configured by the OAM system and/or historical information of the UE;
specifically, the measurement report determining module 22 may further include:
a first decision processing module 221, configured to execute a handover decision on the neighboring cell for the UE when the neighboring cell is determined to be a small cell according to the size information of the neighboring cell acquired by the size information acquiring module 221;
or,
a second decision processing module 222, configured to continue to receive a measurement report that includes information of the neighboring cell and is periodically reported by the UE when the neighboring cell is determined to be a macro cell according to the size information of the neighboring cell acquired by the size information acquiring module 221, and execute a handover decision for the UE when the number of times the measurement report is received reaches a set value. Therefore, although the embodiment of the present invention issues a uniform TTT value to the UE, the TTT value actually used for performing the handover decision for the macro cell is TTT + n*T, wherein N is [0, N-1 ]]The random number n is a random number within a range, and the reporting period T of the UE may be reset to 0 at any time.
The embodiment further provides a UE, the specific structure of which is shown in fig. 3, including:
an information receiving module 31, configured to receive a uniform TTT value for at least one neighboring cell of the UE, where the TTT value is determined according to a size of a neighboring cell with a smallest area in all neighboring cells of the serving cell, where the TTT value is issued by a base station to which the serving cell belongs;
a measurement report processing module 32, configured to perform handover related measurement according to the TTT value to obtain identifier information of the neighboring cell, and configured to report a measurement report including the identifier information of the neighboring cell to a base station to which the serving cell belongs.
Specifically, the information receiving module 31 is further configured to receive a reporting period of a measurement report issued by a base station to which the serving cell belongs, where the reporting period is used to instruct the UE to periodically report the measurement report according to the reporting period;
specifically, the measurement report processing module 32 is further configured to report the measurement report including the identification information of the neighboring cell to the base station to which the serving cell belongs periodically according to the reporting period.
Further, the measurement report processing module 32 is further configured to measure that at least one neighboring cell always satisfies an entry condition of an a3 measurement event in the time period of the TTT value, send a measurement report including identification information of the at least one neighboring cell to a base station to which the serving cell belongs by using a measurement report process, start timing operation of a timer of the report period, after the timing of the timer is ended, send the measurement report again, then start timing operation of the timer of the report period again, and repeat the process.
The measurement report processing module 32 is further configured to, in the timing process of the timer in the reporting period, if it is detected that the new neighboring cell meets the entry condition of the a3 measurement event, send a measurement report including the identification information of the new neighboring cell to the base station to which the serving cell belongs by using the measurement reporting process, then return the timing of the timer in the previous reporting period T to 0, restart the timing operation of the timer in the reporting period T, and after the timing of the timer is ended, send a measurement report including the identification information of the new neighboring cell and the previously reported neighboring cell again.
The embodiment further provides a system for making a handover decision for a UE, where a specific structure of the system is shown in fig. 4, and the system includes: the device for carrying out switching judgment on the UE and the UE. The specific structure of the apparatus is shown in fig. 2, and the specific structure of the UE is shown in fig. 3.
The specific process of performing handover decision on the UE by applying the apparatus and system of the embodiment of the present invention is similar to the foregoing method embodiment, and is not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In summary, the embodiments of the present invention implement configuring a uniform smaller TTT value for both the macro cell and the small cell, and the technical solution can be used by the existing UE without changing the existing standard.
The embodiment of the invention also sets the measurement reporting process of the UE to be periodic by adopting different switching judgment strategies aiming at the macro cell and the small cell, so that the actual effective TTT values of the target cells are different when the target cells are the macro cell and the small cell, thereby reducing the failure rate of switching the UE to the small cell on one hand, and keeping the ping-pong switching probability of the whole network below an acceptable threshold on the other hand.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. A method for making a handover decision for a user equipment, comprising:
the base station to which the serving cell belongs sends the set unified trigger time value aiming at least one adjacent cell of the user equipment to the user equipment;
a base station to which a serving cell belongs receives a measurement report which is reported by user equipment and contains identification information of an adjacent cell, wherein the identification information of the adjacent cell is obtained after the user equipment performs switching related measurement according to the trigger time value, and the base station to which the serving cell belongs obtains the size information of the adjacent cell according to the identification information of the adjacent cell;
and the base station to which the serving cell belongs carries out switching judgment aiming at the user equipment according to the size information of the adjacent cell and a set switching judgment strategy.
2. The method of claim 1, wherein the base station to which the serving cell belongs sends the set uniform trigger time value for at least one neighbor cell to the user equipment, and the method comprises:
a base station to which a serving cell belongs sets a uniform trigger time value and a reporting period of a measurement report for at least one neighboring cell of user equipment, wherein the trigger time value is determined according to the size of the neighboring cell with the smallest area in the at least one neighboring cell of the serving cell, and the reporting period is used for indicating the user equipment to report the measurement report periodically according to the reporting period;
and the base station to which the serving cell belongs sends the trigger time value and the reporting period of the measurement report to the user equipment.
3. The method of claim 2, wherein the trigger time value is determined according to a size of a neighbor cell with a smallest area among all neighbor cells of the serving cell, and comprises:
the trigger time value is determined according to the size of the neighbor cell having the smallest area among all neighbor cells of the serving cell and the size of the serving cell.
4. The method according to claim 1, wherein the obtaining, by the base station to which the serving cell belongs, the size information of the neighboring cell according to the identification information of the neighboring cell includes:
and the base station to which the serving cell belongs acquires the size information of the adjacent cell according to the identification information and the prior information of the adjacent cell, wherein the prior information comprises cell related information configured by an operation, administration and maintenance (OAM) system and/or historical information of the user equipment.
5. The method according to any one of claims 1 to 4, wherein the making of the handover decision for the user equipment according to the size information of the neighboring cell and the set handover decision policy comprises:
when the base station to which the serving cell belongs determines that the neighboring cell is a small cell according to the size information of the neighboring cell, the base station to which the serving cell belongs performs a handover decision on the neighboring cell for the user equipment; or,
when the base station to which the serving cell belongs determines that the neighboring cell is a macro cell according to the size information of the neighboring cell, the base station to which the serving cell belongs determines that the number of times of receiving the measurement report reaches a set value, and the base station to which the serving cell belongs performs handover decision on the neighboring cell for the user equipment.
6. An apparatus for making a handover decision for a user equipment, the apparatus comprising:
a trigger time value processing module, configured to set a uniform trigger time value for at least one neighboring cell of the ue, and send the trigger time value to the ue;
a measurement report receiving module, configured to receive a measurement report that includes identification information of a neighboring cell and is reported by user equipment, where the identification information of the neighboring cell is obtained after the user equipment performs handover-related measurement according to the trigger time value;
and the measurement report judgment module is used for acquiring the size information of the adjacent cell according to the identification information of the adjacent cell received by the measurement report receiving module, and performing switching judgment aiming at the user equipment according to the size information of the adjacent cell and a set switching judgment strategy.
7. An apparatus for making a handover decision for a user equipment according to claim 6, wherein:
the trigger time value processing module is further configured to set a uniform trigger time value and a reporting period of a measurement report for at least one neighboring cell of a user equipment, where the trigger time value is determined according to a size of a neighboring cell with a smallest area among all neighboring cells of the serving cell, and the reporting period is used to instruct the user equipment to report the measurement report periodically; and sending the trigger time value and the reporting period of the measurement report to the user equipment.
8. An apparatus for making a handover decision for a user equipment according to claim 6, wherein:
the measurement report decision module is specifically configured to obtain size information of the neighboring cell according to the identifier information of the neighboring cell and the prior information received by the measurement report receiving module, where the prior information includes relevant information of each cell configured by the operation, administration, and maintenance OAM system and/or historical information of the user equipment.
9. The apparatus as claimed in claim 8, wherein the measurement report decision module further comprises:
a first decision processing module, configured to execute a handover decision on the neighboring cell for the ue when the neighboring cell is determined to be a small cell according to the size information of the neighboring cell acquired by the size information acquiring module of the neighboring cell;
or,
a second decision processing module, configured to execute a handover decision on the neighboring cell for the ue when the number of times the measurement report is received reaches a set value when the neighboring cell is determined to be a macro cell according to the size information of the neighboring cell acquired by the size information acquiring module of the neighboring cell.
10. A user device, comprising:
an information receiving module, configured to receive a uniform trigger time value for at least one neighboring cell of the ue, where the uniform trigger time value is issued by a base station to which a serving cell belongs, and the trigger time value is determined according to a size of a neighboring cell with a smallest area in all neighboring cells of the serving cell;
and the measurement reporting processing module is used for performing switching related measurement according to the trigger time value to obtain the identification information of the adjacent cell, and reporting a measurement report containing the identification information of the adjacent cell to the base station to which the serving cell belongs.
11. The user equipment of claim 10, wherein:
the information receiving module is further configured to receive a reporting period of a measurement report issued by a base station to which the serving cell belongs, where the reporting period is used to instruct the user equipment to periodically report the measurement report according to the reporting period;
the measurement report processing module is further configured to report a measurement report including the identification information of the neighboring cell to the base station to which the serving cell belongs periodically according to the reporting period.
12. The user equipment of claim 10, wherein:
the measurement report processing module is further configured to send a measurement report including identification information of at least one neighboring cell to the base station to which the serving cell belongs, if it is measured that the at least one neighboring cell always satisfies an entry condition of an a3 measurement event within the time period of the trigger time value.
13. The user equipment of claim 12, wherein:
the measurement report processing module is further configured to, during a timing process of a timer in a reporting period, if it is detected that a new neighboring cell meets an entry condition of an a3 measurement event, send a measurement report including identification information of the new neighboring cell to a base station to which the serving cell belongs, return the timing of the timer in the reporting period to 0, restart a timing operation of the timer in the reporting period, and after the timing of the timer is ended, send a measurement report including the identification information of the new neighboring cell and identification information of a previously reported neighboring cell.
14. A system for making handover decisions for user equipment, comprising an apparatus as claimed in any one of claims 6 to 9 and a user equipment as claimed in any one of claims 10 to 13.
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PCT/CN2012/084830 WO2013071895A1 (en) | 2011-11-18 | 2012-11-19 | Method, device and system for user equipment to make handoff decision |
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WO2014183588A1 (en) * | 2013-08-01 | 2014-11-20 | 中兴通讯股份有限公司 | Pre-switching processing method and device, user equipment and cell |
WO2015039449A1 (en) * | 2013-09-23 | 2015-03-26 | 中兴通讯股份有限公司 | Small cell switching method, base station and computer storage medium |
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CN103857015B (en) * | 2013-12-31 | 2017-02-15 | 电子科技大学 | Cell search method based on UE leave mode under LTE |
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US8305997B2 (en) * | 2009-03-10 | 2012-11-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic time to trigger for UE measurements |
US20110086635A1 (en) * | 2009-10-09 | 2011-04-14 | Alcatel-Lucent Usa Inc. | Method And Apparatus For Utilizing Mobility State Information |
KR101722204B1 (en) * | 2010-04-27 | 2017-04-03 | 삼성전자주식회사 | Apparatus and method for providing handover support inforamtion in mobile communication system |
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WO2014183588A1 (en) * | 2013-08-01 | 2014-11-20 | 中兴通讯股份有限公司 | Pre-switching processing method and device, user equipment and cell |
US10015707B2 (en) | 2013-08-01 | 2018-07-03 | Zte Corporation | Method and device for processing pre-handover, UE and cell |
WO2015039449A1 (en) * | 2013-09-23 | 2015-03-26 | 中兴通讯股份有限公司 | Small cell switching method, base station and computer storage medium |
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Application publication date: 20130529 |