CN111194041A - Self-optimization method and device - Google Patents
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Abstract
The invention discloses a self-optimization method, firstly, a first base station informs a second base station of splitting or merging information; and then, the second base station performs load balancing or switching according to the acquired splitting or combining information. The invention also discloses other self-optimization methods and corresponding self-optimization equipment. The method of the invention can coordinate the work among different base stations supporting AAS and between the base stations supporting AAS and not supporting AAS, support load balance, support the self-optimization of mobile robustness, avoid the failure of radio link or switching failure of UE and improve the performance of a mobile communication system.
Description
The application is a divisional application of an invention patent application with the application date of 2013, 9 and 27, and the application number of 201310452203.X, and the name of the invention is self-optimizing method and equipment.
Technical Field
The present application relates to the field of mobile communication systems, and in particular, to a method and apparatus for self-optimization.
Background
With the development of communication technology, a mobile communication system is developed into a System Architecture Evolution (SAE) system, and fig. 1 shows a structural diagram of an existing SAE system. As shown in fig. 1, the system includes an evolved universal terrestrial radio access network (E-UTRAN)101 and a core network at least including a Mobility Management Entity (MME)105 and a user plane entity (S-GW)106, where the E-UTRAN101 is used to connect User Equipment (UE) to the core network, and the E-UTRAN101 further includes more than one macro base station (eNB)102 and home base station (HeNB)103, and optionally includes a home base station gateway (HeNB GW)104, and the MME 105 and the S-GW106 may be integrated into one module or may be separately and independently implemented. Wherein, the enbs 102 are connected to each other via an X2 interface, and are connected to the MME 105 and the S-GW106 via an S1 interface, respectively; the HeNB 103 is directly connected with the MME 105 and the S-GW106 through an S1 interface, respectively, or is connected with the optional HeNB GW 104 through an S1 interface, and the HeNB GW 104 is connected with the MME 105 and the S-GW106 through an S1 interface, respectively.
In the initial stage of building the SAE system or in the operation process of the SAE system, a large amount of manpower and material resources are needed to configure and optimize parameters of the SAE system, especially the setting of wireless parameters, so as to ensure good coverage and capacity of the SAE system, robustness of movement, load balance during movement, speed of user equipment access, and the like. In order to save the manpower and material resource configuration consumed in the operation of the SAE system, a self-optimization method of the SAE system is proposed at present. In the self-optimization process, the setting of the eNB or the HeNB is actually optimized according to the current state of the SAE system, and hereinafter, the eNB and the HeNB are collectively referred to as eNB, and a self-optimization method of the SAE system is described.
Fig. 2 is a schematic diagram illustrating a basic principle of self-optimization of an SAE system, and as shown in fig. 2, after an eNB is powered on or accesses an SAE, a self-configuration process may be performed, where the self-configuration process includes basic configuration of the eNB and initial radio parameter configuration. Wherein the basic configuration of the eNB comprises configuring an Internet Protocol (IP) address of the eNB and detecting operations, maintenance and management (OA & M); authentication between the eNB and the core network; for the eNB being a HeNB, the eNB needs to detect the HeNB GW to which it belongs; downloading the software and operating parameters of the eNB for self configuration. The initial wireless parameter configuration is realized according to experience or simulation, and the performance of each eNB of the SAE system is affected by the environment of the area where the eNB is located, so that the eNB needs to perform initial wireless parameter configuration according to the environment of the area where the eNB is located, specifically, initial configuration of a neighbor list and initial configuration of load balancing.
After the self-configuration process is performed, many parameters configured by the eNB are not optimized, and in order to achieve better performance of the SAE system, the configuration of the eNB needs to be optimized or adjusted, which is also called self-optimization of the mobile communication system. When the configuration of the eNB is optimized or adjusted, the eNB may be controlled by a background OA & M, there may be a standardized interface between the OA & M and the eNB, and the OA & M sends parameters to be optimized to the eNB (which may be the eNB or the HeNB) through the interface, and then the eNB optimizes the parameters configured by itself according to the parameters to be optimized. Of course, the eNB may also perform the optimization or adjustment of the corresponding parameters of the eNB itself, that is, the eNB detects the performance to be optimized. Optimizing or adjusting the configuration of the eNB may include: self-optimization of neighbor cell lists, self-optimization of coverage and capacity, self-optimization of mobility robustness, self-optimization of load balancing, and self-optimization of Random Access Channel (RACH) parameters, among others.
At present, the basic principle of load balancing self-optimization is as follows: the neighboring cell exchanges load information and available resource information, when load balancing is needed, the source cell can switch the UE served by the source cell to a neighboring target cell according to the measurement report of the UE and the available resource information of the neighboring cell, and the target cell executes access control. When load balancing is required, the source cell may request the destination cell to change its handover trigger to the source cell.
In release 12, 3GPP further proposes a research project for researching whether and how to perform self-configuration and self-optimization on a network in the context of an adaptive antenna system AAS. Three AAS scenarios that need to be considered for self-configuration and self-optimization are agreed: beamforming (beam forming), cell shaping cell mapping, and cell splitting/combining (meshing). The problem of UE connection failure is discussed in the context of cell splitting/merging. How to solve these problems and how to better support self-configuration self-optimization in AAS scenarios has no reasonable solution.
Disclosure of Invention
In view of this, the present invention aims to provide several self-optimization methods and devices, so that load balancing can be performed among different base stations according to the location of the UE, the available resources of the cell, the available resources of the neighboring cell, and the configuration condition, wireless resources and system resources are used to the maximum extent, mobile load balancing self-optimization is better supported, radio link failure, handover failure, and RRC reestablishment failure are avoided, and the performance of the mobile communication system is improved.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is specifically realized as follows:
the application provides a self-optimization method, which comprises the following steps:
the first base station informs the second base station of splitting information or merging information;
and the second base station performs load balancing or switching according to the acquired splitting information or the acquired combining information.
Preferably, the splitting information includes: splitting the generated information of the new cell, wherein the information of the new cell comprises one or more of the following information: the method comprises the steps of identifying a new cell, frequency information of the new cell, a tracking area code TAC where the new cell is located, a PLMN ID list broadcasted by the new cell, information of a neighboring cell of the new cell, a cell identification of an original cell before the new cell is generated by splitting, and the time for the new cell to be normally used;
the merging information includes: the information of the new cell after combination, wherein the information of the new cell comprises one or more of the following information: the method comprises the steps of identifying a new cell, frequency information of the new cell, a TAC where the new cell is located, a PLMNID list broadcasted by the new cell, information of a neighboring cell of the new cell, cell identification of an original cell before combination and the time of normal use of the new cell.
Preferably, the load balancing performed by the second base station according to the acquired splitting information or the acquired combining information includes:
and receiving a resource state updating message containing a cell resource measurement result aiming at the new cell, and carrying out load distribution according to the cell resource measurement result of the new cell.
Preferably, the switching by the second base station according to the acquired splitting information or the combining information includes:
configuring the UE to measure the new cell;
or sending a handover request message, wherein the handover request message includes information of one or more new cells, and the information of the new cells includes: cell identity, keNB star, short media access control identity shortMAC-I.
The application provides a self-optimizing device, includes: a notification module and a self-optimization module, wherein:
the notification module is used for notifying split information or combined information;
and the self-optimization module is used for carrying out load balancing or switching according to the acquired splitting information or merging information.
The application provides a self-optimization method, which comprises the following steps:
the first base station informs the second base station of the capability information of the first base station and/or the state information of the first base station cell;
and the second base station performs load balancing or switching or executes energy saving according to the acquired state information or the acquired capability information.
Preferably, the capability information of the first base station includes at least one of the following information:
whether the first base station or the first base station cell supports AAS,
Whether the first base station or the first base station cell supports beamforming,
Whether the first base station or the first base station cell supports cell shaping,
Whether the first base station or the first base station cell supports cell splitting,
Whether the first base station or the first base station cell supports cell combining.
Preferably, if the first base station or the first base station cell supports cell splitting, the method further comprises: the first base station informs the second base station of the supported cell splitting configuration, and informs the second base station of the current service cell and the cell information which can be supported by splitting or combining.
Preferably, the cell information that can be supported by splitting or combining includes one or more of the following information:
the method comprises the steps of cell identification of a cell, frequency information of the cell, TAC where the cell is located, a PLMNID list broadcasted by the cell, information of cells adjacent to the cell, cell identification of an original cell before splitting or combining, and time of normal use of the cell.
Preferably, the state information of the first base station cell includes: the cell is in an active state, or the cell is in an inactive state, or an AAS active state, or an AAS inactive state, or which cell splitting state information of the AAS.
Preferably, the load balancing performed by the second base station according to the acquired information includes:
receiving a resource state updating message containing a cell resource measurement result of a new cell, or receiving a cell resource measurement result of a cell which is in an inactive state and can be obtained through cell splitting, and carrying out load distribution according to the cell resource measurement result; wherein the cell resource measurement result of the new cell comprises: cell identification, hardware load indication, S1 transport layer TNL load indication, radio resource indication, comprehensive available capacity group and ABS state;
or, the base station corresponding to the information request executes AAS cell splitting.
Preferably, the switching by the second base station according to the acquired information includes:
configuring UE to measure the new cell or prepare for switching, wherein the sent switching request message contains information of the new cell, and the information of the new cell comprises: cell identity, keNB star, short media access control identity shortMAC-I.
The application provides a self-optimizing device, includes: a notification module and a self-optimization module, wherein:
the notifying module is used for notifying the capability information of the equipment and/or the state information of the cell of the equipment;
and the self-optimization module is used for carrying out load balancing or switching or executing energy saving according to the acquired state information or capability information.
The application provides a self-optimization method, which comprises the following steps:
when the base station carries out the operation of the self-adaptive antenna system AAS, generating a UE context for the UE in a connection state in a new cell;
and the base station receives the RRC connection reestablishment request in the cell, establishes RRC connection for the UE and sends an RRC connection reestablishment message.
Preferably, the generating, by the base station, the UE context in the new cell when performing the AAS operation includes:
when a base station determines to perform cell splitting on a control cell of the base station, generating a UE context for a new cell of UE in a cell before splitting after splitting;
or when the base station determines to carry out cell combination on the control cell, generating UE context for the UE in the cell before combination in the new cell after combination;
wherein, the UE context comprises the shortMAC-I, KeNB star and/or the PCI of the source cell where the UE is located.
Preferably, the UE context further comprises the C-RNTI of the UE in the new cell.
Preferably, the base station performs the operation of generating the UE context in the new cell when performing the AAS operation, in case that the cell splitting or combining can be completed within the time of the clock T311 of the cell.
The application provides a self-optimizing device, includes: a context management module and a connection management module, wherein:
the context management module is used for generating a UE context for the UE in a connection state in a new cell when the equipment performs AAS operation;
the connection management module is used for receiving an RRC connection reestablishment request of the UE in the cell, establishing RRC connection for the UE and sending an RRC connection reestablishment message.
The application provides a self-optimization method, which comprises the following steps:
the first base station determines to split or combine the cells, and informs the second base station of splitting information or combining information;
the second base station initiates a switching process to other cells or sends reconstruction information to the first base station for the UE which is switched to the cell to be split or combined.
Preferably, the first base station notifies the second base station of the splitting or combining information through UE associated signaling or UE non-associated signaling.
Preferably, if the signaling is associated by the UE, the reason that the signaling contains the handover failure is cell splitting or merging; if the UE non-associated signaling is passed, the signaling contains the state of the cell as follows: the AAS cell splits or merges the state of the cells or the inactive state.
Preferably, the reconstruction information includes cell information of all new cells generated by splitting or combining, and the cell information includes cell identification, KeNB star, shortMAC-I.
The application provides a self-optimizing device, includes: a notification module and a self-optimization module, wherein:
the notifying module is configured to notify splitting or combining information after the device receives a handover request message from another base station and when it is determined to perform cell splitting or combining before a handover completion message of the UE is not received;
the self-optimization module is used for initiating a switching process from the UE which is switched to the cell to be split or combined to other cells or sending reconstruction information to the corresponding base station.
The application provides a self-optimization method, which comprises the following steps:
the first base station performs cell splitting or merging when receiving a switching request message from the second base station, or determines to perform cell splitting or merging after receiving the switching request message from the second base station, and sends a switching preparation failure message to the second base station, wherein the failure reason is cell splitting or merging;
the second base station initiates a switching process to other cells or sends reconstruction information to the first base station for the UE which is switched to the cell to be split or combined.
Preferably, the handover preparation failure message further includes splitting information or merging information.
Preferably, the splitting information or the combining information may be sent to the base station 2 through UE non-associated signaling.
The application provides a self-optimizing device, includes: a notification module and a self-optimization module, wherein:
after the device receives the handover request message from other base stations, when deciding to perform cell splitting or cell combining, the notification module is configured to send a handover preparation failure message to the other base stations, where the failure cause included in the handover preparation failure message is cell splitting or cell combining;
the self-optimization module is used for initiating a switching process from the UE which is switched to the cell to be split or combined to other cells or sending reconstruction information to the corresponding base station.
In summary, the several self-optimization technical solutions provided by the present invention enable coordination work among different base stations supporting the AAS and among base stations supporting the AAS and not supporting the AAS, support load balancing, support self-optimization of mobility robustness, and avoid radio link failure or handover failure of the UE, thereby improving the performance of the mobile communication system.
Drawings
FIG. 1 is a schematic diagram of a conventional SAE system;
FIG. 2 is a schematic diagram illustrating the basic principle of self-optimization of an SAE system;
FIG. 3 is a flowchart illustrating a first method of self-optimization in an AAS scenario according to the present invention;
FIG. 4 is a flowchart illustrating a second method for self-optimization in AAS supporting scenarios according to the present invention;
FIG. 5 is a flowchart illustrating a third method for self-optimization in AAS supporting scenarios according to the present invention;
FIG. 6 is a flowchart illustrating a fourth method for self-optimization in AAS supporting scenarios according to the present invention;
FIG. 7 is a flowchart illustrating a fifth method for self-optimization in AAS supporting scenarios according to the present invention;
FIG. 8 is a schematic structural diagram of a first preferred self-optimizing apparatus according to the present invention;
FIG. 9 is a schematic diagram of a second preferred self-optimizing apparatus according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
FIG. 3 is a flowchart illustrating a first method of self-optimization in a AAS-supported scenario according to the present invention. As shown in fig. 3, the process includes:
When the base station 1 is to split/combine the cells, or after splitting/combining the cells, the splitting information or the combining information is notified to other base stations.
For a cell to be split, the splitting information or combining information includes: splitting the generated information of the new cell, wherein the information of the new cell comprises one or more of the following information:
-cell identity (which may be PCI and/or ECGI) of the new cell;
-frequency information of the new cell;
-the Tracking Area Code (TAC) where the new cell is located;
-a list of PLMN IDs broadcasted by the new cell;
-information of new cell neighbor cells;
-splitting the cell identity of the original cell before the new cell is generated. The relation between the new cell and the original cell can be known by the cell identification;
time the new cell can be used normally. The time may be absolute time or relative time, and represents that the base station 2 may start a timer after receiving the message from the base station 1, and how long the new cell may be used normally. This time may also indicate that the original cell will not be available after this time. The information that the original cell will not be usable after that time may also be included in the serving cell information of the original cell.
The base station 2 knows from the relationship of the new cell and the original cell before the split that the original cell will no longer be available because of the cell split. Or the base station 1 explicitly includes the state of the original cell as cell splitting or cell splitting in progress or AAS through the message notifying the base station 2, or the base station 1 includes the original cell in the serving cell information to be deleted in the message notifying the base station 2, so that the base station 2 knows that the original cell is no longer available.
For the cells to be merged, the splitting information or merging information includes: the merged information of the new cell, wherein the information of the new cell comprises one or more of the following information:
-cell identity (which may be PCI and/or ECGI) of the new cell;
-frequency information of the new cell;
-the Tracking Area Code (TAC) where the new cell is located;
-a list of PLMN IDs broadcasted by the new cell;
-information of new cell neighbor cells;
-merging the cell identities of the previous original cells. The relationship between the merged cell and the original cell before merging can be known by the cell identifications;
time the new cell can be used normally. The time may be absolute time or relative time, and a timer may be started according to the relative time, which indicates how long the base station 2 receives the message from the base station 1, and then the combined cells may be used normally. This time may also indicate that the original cell will not be available after this time before combining. The information that the original cell before combining will not be used after the time may also be included in the serving cell information of the original cell before combining.
The base station 2 knows the original cell that will no longer be available because of cell combining based on the relationship between the cell after combining and the original cell before combining. Or the base station 1 explicitly includes the state of the original cell as cell merging or cell splitting in progress or AAS through the message notifying the base station 2, or the base station 1 includes the original cell in the serving cell information to be deleted in the message notifying the base station 2, so that the base station 2 knows that the original cell is no longer available.
The base station 1 may inform the base station 2 of the above information through an eNB configuration update message.
The base station 2 may configure the measurements of the UE. For example, the cell before the split is cell 1, and the split is followed by cell 2 and cell 3. If the neighbor cell of cell 10 under base station 2 contains cell 1, then base station 2 can configure the measurements of the UE under cell 10, the measured neighbor cell containing a number of new cells (such as cell 2 and cell 3). Therefore, the UE can be switched to the cell 2 or the cell 3 in time, the failure of a wireless link or the failure of switching is avoided, and the UE is prevented from returning to an idle mode. When configuring UE measurements, the base station 2 may consider the time information received from the base station 1 to decide when to configure UE measurements according to the time that the new cell can be used normally.
The base station 2 may configure the measurements of the UE. For example, the cell before the combination is cell 2 and cell 3, and the cell after the combination is cell 1. If the neighbor cell of cell 10 under base station 2 contains a new cell (e.g., cell 2), then base station 2 can configure the measurements of the UEs under cell 10, the measured neighbor cell containing cell 1. This ensures that the UE can be switched to cell 1 in time, avoiding failure of the radio link or switching failure, and avoiding the UE returning to the idle mode. When configuring UE measurements, the base station 2 may consider the time information received from the base station 1 to decide when to configure UE measurements according to the time that the new cell can be used normally.
The base station 2 can perform Multiple handover preparation (re-estimation). For example, the cell before the split is cell 1, and the split is followed by cell 2 and cell 3. If the neighboring cell of cell 10 under base station 2 contains cell 1, then base station 2 can do handover preparation when deciding to initiate handover of the UE to cell 1. That is, the handover request message sent by the base station 2 to the base station 1 includes information of a plurality of new cells (for example, cell 2 and cell 3), and the information of the cell 2 and the cell 3 includes cell identifiers of the cell 2 and the cell 3, a keNB star (the specific meaning and the calculation method are the same as those in 3GPP specifications TS36.331 and TS33.401, and are not described herein again), and a short media access control identifier (shortMAC-I). Therefore, in the process of splitting the cell 1 into the cell 2 and the cell 3, if the cell 1 becomes unavailable, the UE can be successfully reestablished in the cell 2 or the cell 3, the UE can be accessed into the cell 2 or the cell 3 in time, the failure of a wireless link or the failure of switching is avoided, and the UE is prevented from returning to an idle mode. When making the handover multi-preparation, the base station 2 may decide whether and when to perform the handover multi-preparation for the UE to be handed over according to the time that the new cell (the cell that may be generated by splitting or combining) may be normally used, taking into account the time information received from the base station 1.
The base station 2 can make a handover multiple preparation. For example, the cell before the combination is cell 2 and cell 3, and the cell after the combination is cell 1. If the neighboring cells of the cell 10 under the base station 2 include cell 2, the base station 2 can do handover preparation when deciding to initiate handover of the UE to cell 2. That is, the handover request message sent by the base station 2 to the base station 1 includes information of a cell (for example, cell 1), and the information of the cell 1 includes a cell identifier of the cell 1, a keNB star (the specific meaning and calculation method are the same as those in 3GPP specifications TS36.331 and TS33.401, and are not described herein again), and shortMAC-I. Thus, in the process of combining the cell 2 and the cell 3 into the cell 1, if the cell 2 becomes unavailable, the UE can be successfully reestablished in the cell 1, the UE can be accessed into the cell 1 in time, the failure of a wireless link or the failure of switching is avoided, and the UE is prevented from returning to an idle mode. When making the handover multi-preparation, the base station 2 may decide whether and when to perform the handover multi-preparation for the UE to be handed over according to the time that the new cell (the cell that may be generated by splitting or combining) may be normally used, taking into account the time information received from the base station 1.
For the case that the cell 1 is to be split into the cell 2 and the cell 3, if the base station 2 requests the base station 1 to report the cell 1 resource and the base station 1 accepts the request, the base station 1 includes the cell resource measurement results of the cell 2 and the cell 3 when sending the resource status update message. The cell resource measurement results of the cell 2 and the cell 3 may include a cell identifier, a hardware load indication, an S1 transport layer TNL load indication, a radio resource indication, a comprehensive available capacity group, and an ABS status. The base station 2 knows the information of cell 1 splitting through the notification of the base station 1, so the base station 2 considers the report as a normal report, and because the cell 1 is replaced by the cell 2 and the cell 3, the load states of the cell 2 and the cell 3 are valuable to the base station 2. Therefore, when the base station 2 wants to flow the offload to the cell of the base station 1, the offload can be performed in time, the re-initiation of the resource request process is avoided, the suspension (pending) of the original resource request process is avoided, and the failure of the resource reporting and the offload to be performed in time due to the disappearance of the cell 1 is avoided.
For the case that the cell 2 and the cell 3 are to be combined into the cell 1, if the base station 2 requests the base station 1 to report the resource of the cell 2 or the cell 3 and the base station 1 receives the request, the base station 1 includes the cell resource measurement result of the cell 1 when sending the resource status update message. The cell resource measurement result of the cell 1 may include a cell identifier, a hardware load indication, an S1 transport layer TNL load indication, a radio resource indication, a combined available capacity group, and an ABS status. The base station 2 knows the information that the cell 2 and the cell 3 are combined into the cell 1 through the notification of the base station 1, so the base station 2 considers the report as a normal report, and the load state of the cell 1 is valuable to the base station 2 because the cell 1 is to replace the cell 2 and the cell 3. Therefore, the method can be carried out in time when the base station 2 wants to shunt offload the offload to the base station 2 or the cell 3, thereby avoiding reinitiating the resource request process, avoiding the original resource request process from being suspended, and avoiding the situation that the resource report and the offload cannot be carried out in time due to the disappearance of the cell 2 or the cell 3.
The message between the base station 1 and the base station 2 can be sent through an X2 interface or sent through a core network by using an S1 message.
Thus, the working process of the first self-optimization method under the AAS scene is completed. By the method, the base station can timely acquire the state of the adjacent base station cell, better utilize system resources and wireless resources, more effectively perform mobile load balancing self-optimization, better set measurement and switching, and avoid radio link failure or switching failure or Radio Resource Connection (RRC) reestablishment failure.
Fig. 4 is a flowchart of a second method for self-optimization in the AAS-supported scenario according to the present invention. As shown in fig. 4, the process includes:
The base station 1 capability information includes at least one of the following information:
capability information of whether base station 1 or base station 1 cell supports AAS,
Whether base station 1 or base station 1 cell supports beamforming,
Whether the base station 1 or the base station 1 cell supports cell shaping,
Whether base station 1 or base station 1 cell supports cell splitting,
Whether base station 1 or base station 1 cell supports cell merging.
In case base station 1 or base station 1 cell supports cell splitting, base station 1 may also inform base station 2 which configured cell splitting is supported, e.g. information supporting splitting into 2 or 3 cells. The message sent by the base station 1 to the base station 2 also contains the current serving cell information and cell information that can be supported by splitting or combining. For example, the current serving cell is cell 1, and when necessary, cell 1 may be split into cell 2 and cell 3, so that the message may include information of cell 2 and cell 3 as serving cells in addition to information of cell 1 as serving cells, and states of cell 2 and cell 3 are inactive (not active) and may be split into active (active) states by AAS. The relationship of cell 2 and cell 3 to cell 1 may also be included in the message (i.e., cell 2 and cell 3 may be generated by splitting of cell 1). This relationship may be identified by including the information of cell 2 and cell 3 in the information of serving cell 1 as sub-information of serving cell 1. The information of cell 2 and cell 3 may also include the identity of cell 1 to indicate which cell (i.e., cell 1) may be split. For another example, the current serving cell is cell 2 and cell 3, and cell 2 and cell 3 may be merged into cell 1 when needed, so that the message includes information of cell 1 as the serving cell in addition to information of cell 2 and cell 3, and the state of cell 1 is inactive (not active), and may be merged into an active (active) state through AAS. The relationship of cell 1 to cell 2 and cell 3 may also be included in the message (i.e., cell 1 may be generated by combining cell 2 and cell 3). The information of cell 1 may also include cell identities of cell 2 and cell 3 to indicate which cells may be combined.
The cell information that can be supported by splitting or combining includes one or more of the following information:
-cell identity (which may be PCI and/or ECGI) of the cell;
-frequency information of a cell;
-the Tracking Area Code (TAC) in which the cell is located;
-a list of PLMN IDs broadcasted by the cell;
-information of cell neighbor cells;
cell identity of the original cell before splitting/combining. The relation between the new cell and the original cell can be known by the cell identification; for the merging case, the cell identifier of the original cell may be multiple;
times when a cell may be used normally, e.g. one to three pm.
Wherein the state information of the cell includes information of which cell is in an active state, or in an inactive state, or in an AAS active state, or in an AAS inactive state, or in which cell splitting state of the AAS. Which cell split state the AAS, e.g. cell 1, can split into two cells or 3 cells, is now in a split into 2 cells state.
The base station 1 may inform the base station 2 of the above information through an X2 setup request message or an eNB configuration update message. The base station 2 may transmit the above-mentioned information of the base station 2 to the base station 1 through the X2 setup response message or the eNB configuration update message.
Upon update of the above capability or cell status of the base station 1, the base station 1 may transmit the above information to the base station 2 with an eNB configuration update message. If the new configuration starts to be used normally after a certain time, the base station 1 notifies the base station 2 of the time of normal use, where the time may be absolute time or relative time, and indicates that the new configuration starts to be used normally after a period of time after the base station 2 receives the message.
The base station 2 may configure the UE measurements when the state of the cell under base station 1 changes. For example, the cell before the split is cell 1, and the split is followed by cell 2 and cell 3. If the neighbor cell of cell 10 under base station 2 contains cell 1, then base station 2 can configure the measurements of the UE under cell 10, the measured neighbor cells containing cell 2 and cell 3. Thus, timely switching to the cell 2 or the cell 3 is ensured, failure of a wireless link or switching failure is avoided, and the UE is prevented from returning to an idle mode. When configuring UE measurements, the base station 2 may consider the time information received from the base station 1 to decide when to configure UE measurements according to the time that the new cell can be used normally.
The base station 2 may configure the UE measurements when the state of the cell under base station 1 changes. For example, the cell before the combination is cell 2 and cell 3, and the cell after the combination is cell 1. If the neighbor cell of cell 10 under base station 2 contains cell 2, then base station 2 can configure the measurements of the UE under cell 10, the measured neighbor cell containing cell 1. This ensures that the handover to cell 1 can be performed in time, avoiding radio link failure or handover failure and avoiding the UE returning to the idle mode. When configuring UE measurements, the base station 2 may consider the time information received from the base station 1 to decide when to configure UE measurements according to the time that the new cell can be used normally.
The base station 2 can make a handover multiple preparation. For example, the cell before the split is cell 1, and the split is followed by cell 2 and cell 3. If the neighboring cell of cell 10 under base station 2 contains cell 1, then base station 2 can do handover preparation when deciding to initiate handover of the UE to cell 1. I.e. the handover request message sent by the base station 2 to the base station 1 contains the information of cell 2 and cell 3. The information of cell 2 and cell 3 may be included in the re-establishment information of the handover request. The information of the cell 2 and the cell 3 includes a cell identifier, a keNB star (the specific meaning and the calculation method are the same as those in 3GPP specifications TS36.331 and TS33.401, and are not described herein again), and shortMAC-I. Therefore, in the process of splitting the cell 1 into the cell 2 and the cell 3, if the cell 1 becomes unavailable, the UE can be successfully reestablished in the cell 2 or the cell 3, the UE can be accessed into the cell 2 or the cell 3 in time, the failure of a wireless link or the failure of switching is avoided, and the UE is prevented from returning to an idle mode. When making the handover multi-preparation, the base station 2 may decide whether and when to perform the handover multi-preparation for the UE to be handed over according to the time that the new cell (the cell that may be generated by splitting or combining) may be normally used, taking into account the time information received from the base station 1.
The base station 2 can make a handover multiple preparation. For example, the cell before the combination is cell 2 and cell 3, and the cell after the combination is cell 1. If the neighboring cells of the cell 10 under the base station 2 include cell 2, the base station 2 can do handover preparation when deciding to initiate handover of the UE to cell 2. I.e. the handover request message sent by the base station 2 to the base station 1 contains the information of cell 1. The information of cell 1 may be included in the re-establishment information of the handover request. The information of the cell 1 includes a cell identifier of the cell 1, a keNB star (the specific meaning and the calculation method are the same as those in 3GPP specifications TS36.331 and TS33.401, and are not described herein again), and shortMAC-I. Thus, in the process of combining the cell 2 and the cell 3 into the cell 1, if the cell 2 becomes unavailable, the UE can be successfully reestablished in the cell 1, the UE can be accessed into the cell 1 in time, the failure of a wireless link or the failure of switching is avoided, and the UE is prevented from returning to an idle mode. When performing handover multiple preparations, the base station 2 may determine whether and when to perform handover multiple preparations for the UE to be handed over according to the time that the new cell can be normally used, taking into account the time information received from the base station 1.
For the case that the cell 1 is to be split into the cell 2 and the cell 3, if the base station 2 requests the base station 1 to report the cell 1 resource and the base station 1 accepts the request, the base station 1 may include the cell resource measurement results of the cell 2 and the cell 3 when sending the resource status update message. The cell resource measurement results of the cell 2 and the cell 3 may include a cell identifier, a hardware load indication, an S1 transport layer TNL load indication, a radio resource indication, a comprehensive available capacity group, and an ABS status. The base station 2 knows the information of cell 1 splitting through the notification of the base station 1, so the base station 2 considers the report as a normal report, and because the cell 1 is replaced by the cell 2 and the cell 3, the load states of the cell 2 and the cell 3 are valuable to the base station 2. Therefore, the method can be carried out in time when the base station 2 wants to flow the offload to the cell of the base station 1, thereby avoiding the re-initiation of the resource request process, avoiding the original resource request process from being suspended, and avoiding the situation that the resource report and the offload cannot be carried out in time due to the disappearance of the cell 1.
For the case that the cell 2 and the cell 3 are to be combined into the cell 1, if the base station 2 requests the base station 1 to report the resource of the cell 2 or the cell 3 and the base station 1 receives the request, the base station 1 may include the cell resource measurement result of the cell 1 when sending the resource status update message. The cell resource measurement result of the cell 1 may include a cell identifier, a hardware load indication, an S1 transport layer TNL load indication, a radio resource indication, a combined available capacity group, and an ABS status. The base station 2 knows the information that the cell 2 and the cell 3 are combined into the cell 1 through the notification of the base station 1, so the base station 2 considers the report as a normal report, and the load state of the cell 1 is valuable to the base station 2 because the cell 1 is to replace the cell 2 and the cell 3. Therefore, the method can be carried out in time when the base station 2 wants to shunt offload the offload to the base station 2 or the cell 3, thereby avoiding reinitiating the resource request process, avoiding the original resource request process from being suspended, and avoiding the situation that the resource report and the offload cannot be carried out in time due to the disappearance of the cell 2 or the cell 3.
The base station 2, when sending the resource status request message to the base station 1, may request the resource status of the cell which is now in the inactive state but can be split by a certain cell. If the base station 1 accepts the request, the base station 1 includes the resource cell resource measurement result of the cell which can be generated by cell splitting when transmitting the resource status update. The cell resource measurement result comprises a cell identifier, a hardware load indication, an S1 transport layer TNL load indication, a radio resource indication, a comprehensive available capacity group, an ABS state and the like.
When the base station 2 needs to offload load to the base station 1, the base station 2 may send a message to the base station 1, requesting the base station 1 to perform AAS cell splitting. The base station 2 may decide to request the base station 1 to perform AAS cell splitting according to the received capability information of the base station 1 and/or the resource status of the cell of the base station 1 and/or the traffic volume that the base station 2 needs to offload. Especially, according to the resource reporting procedure between the base station 1 and the base station 2, when the available resources of the cell of the base station 1 are insufficient, such an operation has a great effect on effective load balancing. The base station 2 may also request how the base station 1 performs AAS operations, for example, to divide into 2 cells or 3 cells, according to the AAS operation configuration supported by the base station 1. The base station 1 may perform corresponding operations after receiving the cell splitting request of the base station 2. The base station 2 may also inform the base station 1 of the information of the required resources so that the base station 1 performs the corresponding AAS operation, e.g. splitting into two cells or three cells, depending on the situation of the resources required by the base station 2. Such a scheme is particularly useful in the context of a heterogeneous network (hetnet), e.g., a macro cell with basic coverage, and a pico (pico) cell. The pico cell supports the AAS function, and the pico cell does not bring coverage holes when executing the AAS operation, so the pico cell can execute the AAS operation according to the requirement of the flow load of the basic coverage cell.
When the base station 2 needs to offload load to the base station 1, the base station 2 may send a message to the base station 1 to request the base station 1 to perform cell mapping. The base station 2 may determine to request the base station 1 to execute cell mapping according to the received capability information of the base station 1 and/or the resource state of the cell of the base station 1 and/or the traffic volume that the base station 2 needs to offload. And the base station 2 requests the base station 1 to perform cell mapping towards the direction according to the measurement report of the UE or the position of the UE.
To save energy, the base station 1 may be in a switch off or deactivation state. When requesting the base station 1 to open the cell (switch on), the base station 2 may request the base station 1 to open the cell in what manner, for example, to open the cell 1 or to open the cell 2 and the cell 3 (it is assumed here that the cell 1 may be split into the cell 2 and the cell 3), and the base station 2 may determine how to open the base station 1 according to the traffic and resource requirements that the base station 2 needs to offload to the base station 1.
The message between the base station 1 and the base station 2 can be sent through an X2 interface or sent through a core network by using an S1 message.
Thus, the working process of the self-optimization method II under the AAS scene is completed. By the method, the base station can timely know the state of the cell of the adjacent base station, system resources and wireless resources are better utilized, mobile load balancing self-optimization is more effectively carried out, measurement and switching are better set, and radio link failure or switching failure or RRC reestablishment failure is avoided.
Fig. 5 is a flowchart of a third method for supporting self-optimization in an AAS scenario according to the present invention. As shown in fig. 5, the process includes:
Specifically, the base station may generate the UE context at the new cell if:
the base station decides to perform cell splitting on its controlling cell, e.g. cell 1 into cell 2 and cell 3. The base station generates UE context for the UE in the cell 1 in the cell 2 and the cell 3, wherein the UE context comprises shortMAC-I, KeNB star, PCI of a source cell where the UE is located, and can also comprise C-RNTI of the UE in the cell 1. The base station also knows the cell, e.g. cell 2 or cell 3, in which this UE context is located. Thus, if the UE served in the cell 1 cannot be successfully switched away, the UE with connection failure in the cell 1 split can ensure that the UE is successfully reestablished in the cell 2 or the cell 3, so that the UE does not return to the idle mode.
The base station decides to perform cell merging on its control cells, e.g. cell 2 and cell 3 are merged into cell 1. The UE served by the base station to cell 2 generates a UE context in cell 1, and the UE served by the base station to cell 3 generates a UE context in cell 1. The UE context comprises a shortMAC-I, KeNB star, the PCI of a source cell where the UE is located, and can also comprise a C-RNTI of the UE in a cell 2 or a cell 3. The base station also knows the cell, e.g. cell 1, in which this UE context is located. Thus, if the UE served in the cell 2 or the cell 3 cannot be successfully switched away, the UE with connection failure in the process of combining the cell 2 and the cell 3 can ensure that the UE is successfully reestablished in the cell 1, so that the UE does not return to the idle mode.
The base station receives a switching request message sent from another base station or MME, and the switching request message contains the PCI of the source cell. According to the second method, if another base station knows that the base station supports the AAS function or that a cell of the base station supports the AAS function, the other base station may always include the cell identity PCI of the source cell when initiating the handover of the UE to the base station or to the cell of the base station. If the destination cell for the handover is cell 1, and cell 1 is splitting into cell 2 and cell 3, then the destination base station generates UE context for the UE in cell 2 and cell 3. The UE context comprises a shortMAC-I, KeNB star, the PCI of a source cell where the UE is located, and can also comprise a C-RNTI of the UE in a cell 2 or a cell 3. The base station also knows the cell, e.g. cell 2 or cell 3, in which this UE context is located. Thus, if the UE fails handover, the re-establishment can be successful in cell 2 and cell 3, so that the UE does not return to idle mode. If the target cell for handover is cell 2, and cell 2 and cell 3 are merging into cell 1, then the target base station generates a UE context for the UE in cell 1. The UE context comprises shortMAC-I, KeNB star, the PCI of the source cell where the UE is located, and can also comprise the C-RNTI of the UE in the cell 1. The base station also knows the cell, e.g. cell 1, in which this UE context is located. Thus, if the UE fails handover, the re-establishment can be successful in cell 1, so that the UE does not return to the idle mode.
The generation of the UE context in the new cell by the base station while performing the AAS operation may be performed according to the configuration of operation and maintenance (O & M) or may be autonomously decided by the base station. The base station generates the UE context of the new cell when performing the AAS operation, and performs the UE context generation only if the UE context of the new cell can be completely split or combined within the time of the clock T311 of the cell. The base station may also consider the time required for cell splitting or merging when setting the T311 clock for a cell supporting the AAS operation such that T311 is longer than the time required for the AAS operation. The time required for the AAS operation refers to the time from the beginning of the cell splitting performed by the base station to the time that the split cell can be normally used.
Thus, the working process of the self-optimization method III in the AAS scene is completed. By the method, radio link failure or switching failure or RRC reestablishment failure can be avoided, the capacity of the network is better ensured, and the user satisfaction is improved.
FIG. 6 is a flowchart illustrating a fourth method for self-optimization in AAS supporting scenarios according to the present invention. As shown in fig. 6, the process includes:
Wherein base station 2 is a neighboring base station to base station 1. The cell controlled by base station 2 is the neighbour of the cell controlled by base station 1. When the base station 1 decides to split or combine the cells, it may have received the handover request message from the base station 2 for handover of the UE, but has not received the handover complete message from the UE.
The base station 1 may notify the base station 2 of the splitting information or combining information of the base station 1 cell through UE associated (associated) signaling or UE non-associated signaling. If the signaling is associated through the UE, the signaling can contain the reason of the switching failure, namely cell splitting or merging; if through UE non-associated signaling, the signaling may contain the state of the cell as: the AAS cell splits or merges cell states or inactive states. If the signaling is UE non-associated signaling, the eNB can configure an update message to inform the base station 2 of the splitting information or the combining information of the base station 1 cell.
The splitting information or the merging information further includes the splitting information or the merging information described in step 301, which is not described herein again.
In step 602, the base station 2 initiates a handover procedure to another cell or sends re-establishment information to the base station 1 for the UE being handed over to the cell to be split or merged. The base station 2 sends a handover request message to the base station 1 according to the handover request message (handover request and handover request message if it is S1 handover), but does not receive the resource release message or the UE context release order message, and knows that the handover of the UE is not completed. Wherein, the message between the base station 1 and the base station 2 can be sent through an X2 interface or sent through a core network by using an S1 message.
The base station 2 may initiate a handover of the UE to a new cell resulting from splitting or combining. For the case that the cell of the base station 1 is split, the base station 2 includes all split cell information in the re-establishment information included in the handover request or handover request message, where the cell information includes a cell identifier, a KeNB star, and a shortMAC-I. Therefore, the reconstruction success can be guaranteed no matter which split cell the UE reconstructs in. The base station 2 may calculate the KeNB star according to the cell identifier, the cell frequency, and the like of the new cell generated by splitting or combining received from step 601. The calculation of shortMAC-I and KeNB stars is the same as the prior art, and the present invention is not described in detail.
The base station 2 may also send reconstruction information to the base station 1, where the reconstruction information includes cell information of all new cells generated by splitting or combining, and the cell information includes a cell identifier, a KeNB star, and a shortMAC-I. Therefore, the reconstruction success can be guaranteed no matter which split cell the UE reconstructs in. The base station 2 may calculate the KeNB star according to the cell identifier, the cell frequency, and the like of the new cell generated by splitting or combining received from step 601. The calculation of shortMAC-I and KeNB stars is the same as the prior art, and the present invention is not described in detail.
Thus, the working process of the self-optimization method in the AAS scene is completed. By the method, radio link failure or switching failure or RRC reestablishment failure can be avoided, the capacity of the network is better ensured, and the user satisfaction is improved.
Fig. 7 is a flowchart of a fifth method for self-optimization in the AAS-supported scenario according to the present invention. As shown in fig. 7, the process includes:
in step 701, the base station 1 is performing cell splitting or merging when receiving the handover request message from the base station 2, or the base station 1 decides to perform cell splitting or merging after receiving the handover request message from the base station 2, and the base station 1 sends a handover preparation failure message to the base station 2. The handover preparation failure message may be sent through an X2 interface or through a core network with an S1 message.
The failure reason included in the handover preparation failure is cell splitting or merging.
The handover preparation failure may further include splitting information or merging information. The splitting information or the merging information is the same as step 301, and is not described herein again.
The base station 1 may send cell split information or merge information to the base station 2 through UE non-associated signaling, e.g., eNB configuration update. The splitting information or the merging information is the same as step 301, and is not described herein again.
Step 702 is the same as step 602 and will not be described herein. The base station 2 knows that the target cell is performing cell splitting or merging and splitting information or merging information according to the handover preparation failure, or the base station 2 knows that the target cell is performing cell splitting according to the handover preparation failure and knows the splitting information or merging information according to the UE non-associated signaling, so that the base station 2 performs the operation of step 602.
Thus, the working process of the self-optimization method in the AAS scene is completed. By the method, radio link failure or switching failure or RRC reestablishment failure can be avoided, the capacity of the network is better ensured, and the user satisfaction is improved.
Corresponding to the first method of self-optimization shown in fig. 3, the present invention provides a self-optimization device shown in fig. 8, which includes a notification module and a self-optimization module, wherein:
the notification module is used for notifying split information or combined information;
and the self-optimization module is used for carrying out load balancing or switching according to the acquired splitting information or merging information.
Corresponding to the second method for self-optimization shown in fig. 4, the present invention also provides a self-optimization device, which has the same structure as the self-optimization device shown in fig. 8, and also includes a notification module and a self-optimization module, where:
the notifying module is used for notifying the capability information of the equipment and/or the state information of the cell of the equipment;
and the self-optimization module is used for carrying out load balancing or switching or executing energy saving according to the acquired state information or capability information.
Corresponding to the third method of self-optimization shown in fig. 5, the present invention provides a self-optimization apparatus as shown in fig. 9, the apparatus comprising: a context management module and a connection management module, wherein:
the context management module is used for generating a UE context for the UE in a connection state in a new cell when the equipment performs AAS operation;
the connection management module is used for receiving an RRC connection reestablishment request of the UE in the cell, establishing RRC connection for the UE and sending an RRC connection reestablishment message.
Corresponding to the fourth method for self-optimization shown in fig. 6, the present invention also provides a self-optimization device, which has the same structure as the self-optimization device shown in fig. 8, and also includes a notification module and a self-optimization module, where:
the notifying module is configured to notify splitting or combining information after the device receives a handover request message from another base station and when it is determined to perform cell splitting or combining before a handover completion message of the UE is not received;
the self-optimization module is used for initiating a switching process from the UE which is switched to the cell to be split or combined to other cells or sending reconstruction information to the corresponding base station.
Corresponding to the fifth method for self-optimization shown in fig. 7, the present invention also provides a self-optimization device, which has the same structure as the self-optimization device shown in fig. 8, and also includes a notification module and a self-optimization module, where:
after the device receives the handover request message from other base stations, when deciding to perform cell splitting or cell combining, the notification module is configured to send a handover preparation failure message to the other base stations, where the failure cause included in the handover preparation failure message is cell splitting or cell combining;
the self-optimization module is used for initiating a switching process from the UE which is switched to the cell to be split or combined to other cells or sending reconstruction information to the corresponding base station.
According to the technical scheme, the self-optimization technical scheme provided by the invention enables coordination work among different base stations supporting AAS and among base stations supporting AAS and not supporting AAS, supports load balancing, supports self-optimization of mobile robustness, avoids radio link failure or switching failure of UE, and improves the performance of a mobile communication system.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (14)
1. A method of self-optimization, comprising:
the second base station receives the notice of splitting information or combining information from the first base station;
and the second base station performs load balancing or switching according to the acquired splitting information or the acquired combining information.
2. The method of claim 1, wherein:
the splitting information includes: splitting the generated information of the new cell, wherein the information of the new cell comprises one or more of the following information: the method comprises the steps of identifying a new cell, frequency information of the new cell, a tracking area code TAC where the new cell is located, a PLMN ID list broadcasted by the new cell, information of a neighboring cell of the new cell, a cell identification of an original cell before the new cell is generated by splitting, and the time for the new cell to be normally used;
the merging information includes: the information of the new cell after combination, wherein the information of the new cell comprises one or more of the following information: the method comprises the steps of identifying a new cell, frequency information of the new cell, a TAC where the new cell is located, a PLMN ID list broadcasted by the new cell, information of a neighboring cell of the new cell, cell identification of an original cell before combination and time for normal use of the new cell.
3. A self-optimizing device, comprising:
a module for receiving splitting information or combining information notified by a first base station;
and the self-optimization module is used for carrying out load balancing or switching according to the acquired splitting information or merging information.
4. A method of self-optimization, comprising:
the second base station receives the notification of the capability information of the first base station and/or the state information of the first base station cell;
and the second base station performs load balancing or switching or executes energy saving according to the acquired state information or the acquired capability information.
5. The method of claim 4, wherein the capability information of the first base station comprises at least one of the following information:
whether the first base station or the first base station cell supports AAS,
Whether the first base station or the first base station cell supports beamforming,
Whether the first base station or the first base station cell supports cell shaping,
Whether the first base station or the first base station cell supports cell splitting,
Whether the first base station or the first base station cell supports cell combining.
6. A self-optimizing device, for use in a first base station, comprising: a notification module and a self-optimization module, wherein:
the notifying module is configured to notify the second base station of capability information of the first base station under the adaptive antenna system AAS and/or state information of the cell of the device, so that the second base station performs load balancing or switching or performs energy saving according to the acquired state information or capability information.
7. A method of self-optimization, comprising:
when the base station carries out the operation of the self-adaptive antenna system AAS, generating a UE context for the UE in a connection state in a new cell;
and the base station receives the RRC connection reestablishment request in the cell, establishes RRC connection for the UE and sends an RRC connection reestablishment message.
8. The method of claim 7, wherein the base station generating a UE context in a new cell when performing AAS operation comprises:
when a base station determines to perform cell splitting on a control cell of the base station, generating a UE context for a new cell of UE in a cell before splitting after splitting;
or, when the base station decides to perform cell merging on the control cell, generating a UE context for the UE in the cell before merging in the new cell after merging.
9. A self-optimizing device, comprising: a context management module and a connection management module, wherein:
the context management module is used for generating a UE context for the UE in a connection state in a new cell when the equipment performs AAS operation;
the connection management module is used for receiving an RRC connection reestablishment request of the UE in the cell, establishing RRC connection for the UE and sending an RRC connection reestablishment message.
10. A method of self-optimization, comprising:
the second base station receives the notice of splitting information or combining information when the first base station decides to split or combine the cells;
the second base station initiates a switching process to other cells or sends reconstruction information to the first base station for the UE which is switched to the cell to be split or combined.
11. A self-optimizing device, comprising: a notification module and a self-optimization module, wherein:
the notifying module is configured to notify splitting or combining information after the device receives a handover request message from another base station and when it is determined to perform cell splitting or combining before a handover completion message of the UE is not received;
so that the other base stations initiate the switching process to other cells or send reconstruction information to the corresponding base stations for the UE which is switched to the cell to be split or combined.
12. A method of self-optimization, comprising:
the second base station receives a handover preparation failure message sent by the first base station, wherein the failure reason is cell splitting or cell merging; the handover preparation failure message is sent when the first base station receives a handover request message from the second base station while cell splitting or merging is being performed, or is sent when the first base station determines to perform cell splitting or merging after receiving the handover request message from the second base station;
the second base station initiates a switching process to other cells or sends reconstruction information to the first base station for the UE which is switched to the cell to be split or combined.
13. The method of claim 12, wherein:
the handover preparation failure message further includes splitting information or merging information.
14. A self-optimizing device, comprising: a notification module and a self-optimization module, wherein:
after the device receives the handover request message from other base stations, when deciding to perform cell splitting or cell combining, the notification module is configured to send a handover preparation failure message to the other base stations, where the failure cause included in the handover preparation failure message is cell splitting or cell combining;
so that the other base stations initiate the switching process to other cells or send reconstruction information to the corresponding base stations for the UE which is switched to the cell to be split or combined.
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| CN108156609B (en) * | 2016-12-02 | 2022-08-19 | 中兴通讯股份有限公司 | Cell merging and splitting method, device and base station |
| CN109947763B (en) * | 2017-09-07 | 2021-09-17 | 大唐移动通信设备有限公司 | Processing method and device based on self-optimization network SON |
| CN109788517B (en) * | 2017-11-15 | 2023-04-07 | 大唐移动通信设备有限公司 | Pcell or PScell management method and device |
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| CN104519506A (en) | 2015-04-15 |
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