JP2011087294A - Method and facility for supporting mobility management in radio communication network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a facility for supporting mobility management in a radio communication network. <P>SOLUTION: Based on neighboring cell information reported from a home base station, a neighboring relationship information table is constructed and maintained, and based on associated information in the neighboring relationship information table, a cell search of UE, cell re-selection measurement and cell switching measurement are optimized. Therefore, since the mobility management of the home base station is supported and efficiency in the cell search and the measurement can be improved, cell re-selection and switching performance is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to the technical field of wireless communication networks, and more particularly, to a method and apparatus for supporting mobility management in a wireless communication network.

  3GPP's long-term evolution system is a highly promising mobile communication system, which can provide higher radio access speeds and better service support from a traditional Universal Mobile Telecommunications System (UMTS) network. FIG. 1 is a diagram illustrating an architecture of an LTE network. In the LTE network, a mobility management entity MME (Mobility Management Entity) is connected to a base station via an S1 interface. The home base station HeNB (Home eNode B) can be directly connected to the MME, or can be connected to the MME via a home base station gateway HeNB GW (HeNB Gateway). In the LTE system, a concept called a closed subscriber group (CSG) is introduced to the HeNB. By adopting CSG admission control, only a specific terminal UE (User Equipment) can access the corresponding HeNB. The home base station HNB (Home NodeB) of the UMTS system also has a similar function.

  In UMTS, LTE, and LTE-A systems, HNB / HeNB and other types of base stations (eg, macro base station (macro eNB), micro base station (micro eNB), pico base station (pico eNB), relay node (relay) node)) is a very important technical point, and HNB / HeNB more effectively supports mobile services to satisfy user demand and improve provider competitiveness Related to doing. FIG. 2 shows two main home base station switching scenes, a switching scene from a macro cell to a home cell and a switching scene between home base stations.

  The present invention provides a method and equipment for supporting mobility management in a wireless communication network, which can effectively support the mobility management problem of a home base station, as a technical problem to be solved. Yes.

In order to solve the above technical problem, the present invention provides the following technical solution.
In a method for supporting mobility management in a wireless communication network, a pre-built neighbor including information of neighboring home cells of a macro cell including a home cell in a coverage of the macro cell and information of neighboring home cells of the home cell Maintaining the switching priority of each adjacent home cell of any one cell in the relationship information table based on cell reselection and switching statistical information, and the switching priority and the information of the CSG to which the terminal belongs And controlling the terminal to perform a cell search, reselection and switching process.

  Preferably, in the method, the switching priority of each of the adjacent home cells is maintained based on statistical information on cell reselection and switching. Determine the number of times of successful switching and reselection to each of the home cells, and based on the number of times, the switching priority of the neighboring home cell with the higher number of times is higher than the switching priority of the neighboring home cell with the lower number of times. To set the switching priority of each of the adjacent home cells.

  Preferably, in the above method, maintaining the switching priority of each of the adjacent home cells based on cell reselection and switching statistical information, and further, from the arbitrary one cell within a predetermined first time. It is determined whether or not there has been a failure to switch to each of the neighboring home cells, and if there is a failure, the switching priority of each of the neighboring home cells is lowered according to a predetermined policy.

  Preferably, in the above method, in the construction of the adjacency information table, home cell information corresponding to the home base station reported from a home base station, information on neighboring home cells of the home base station, and the home base station Receiving information on the macro cell where the home base station is located, information on the home cell corresponding to the home base station reported from each home base station, information on neighboring home cells of the home base station, and information on the macro cell where the home base station is located Building and maintaining an adjacency information table based on the information.

  Preferably, in the above method, the home cell information corresponding to the home base station includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID and TAI, The information on the neighboring home cell of the base station includes some or all of PCI, E-CGI, frequency point information, and TAI, and the information on the macro cell where the home base station is located is PCI, E-CGI. , Including some or all of the frequency point information and TAI, and the information of the neighboring home cell of the macro cell is a part of PCI, E-CGI, CSG-ID, access mode, HeNB ID and TAI. Or the information of neighboring home cells of the home cell includes PCI, E-CGI, CSG-ID, access mode, HeNB ID Some of the fine TAI or include all.

  Preferably, in the above method, the adjacency information table and the switching priority information are stored in a network node on the network side, and the network node further includes an adjacent cell of a cell where the terminal is currently located. The terminal performs the cell search, reselection and switching process based on information, information on switching priority of neighboring cells of the first cell where the terminal is currently located, and information on CSG to which the terminal belongs. To control.

  Preferably, in the method, in controlling the terminal to perform the cell search, reselection and switching process, the home cells of the CSG in which each adjacent home cell is arranged in order of higher switching priority, Arranging adjacent home cells of the first cell according to the front-to-back order of the non-CSG home cell in the open / hybrid mode and the non-CSG home cell in the closed mode, and the network node includes the adjacent home of the first cell Controlling the terminal to preferentially execute the cell search, reselection, and switching process for a cell that is previously arranged in the cell.

  Preferably, in the method, in controlling the terminal to perform the cell search, reselection, and switching process, the network node further has a movement speed of the terminal higher than a predetermined first threshold. When indicated by the mobility state of the terminal, according to the order of the arrangement, the neighboring macro cell of the first cell arranges the neighboring cells of the first cell before the neighboring home cell of the first cell. Controlling the terminal to preferentially execute the cell search, reselection and switching process for a previous cell.

  Preferably, in the above method, the adjacency information table and the switching priority information are stored in a network node on the network side, and the network node includes the adjoining home cell of the first home cell and the first home cell. Information on neighboring cells of the first home cell including the macro cell in which the first indoor base station corresponding to the home cell is located is selected from the neighboring relationship information table, and information on neighboring cells of the first home cell and the first Information of switching priority of neighboring cells of the home cell is transmitted to the first home base station, and the first home base station further transmits information on neighboring cells of the first home cell, and information on the first home cell. The cell search, reselection and re-selection based on the information on the switching priority of neighboring cells and the information on the first CSG to which the first terminal entering the first home cell belongs. Controlling the first terminal to perform a switching process.

  Preferably, in the method, the adjacency information table and the switching priority information are stored in a network node on the network side, and the network node includes a first macro cell including an adjacent home cell of the first macro cell. Is selected from the adjacent relationship information table, and the information on the neighboring cells of the first macro cell and the information on the switching priority of the neighboring cells of the first macro cell are the first corresponding to the first macro cell. The first macro base station transmits information on neighboring cells of the first macro cell, information on switching priority of neighboring cells of the first macro cell, and the first macro cell entering the first macro cell. Based on information of the first CSG to which the terminal belongs, the first terminal is configured to perform the cell search, reselection, and switching process. Control to.

  Preferably, in the method, in controlling the first terminal to perform the cell search, reselection and switching process, after the first terminal enters the coverage of the first macro cell, the first macro The base station arranges the adjacent home cells of the first macro cell based on the information of the first CSG to which the first terminal belongs previously acquired and the switching priority of each adjacent home cell of the first macro cell; The first CSG home cells arranged in descending order of switching priority, the non-first CSG home cell in the open / hybrid mode, and the non-first CSG home cell in the closed mode are arranged in the front-to-back order. Arranging adjacent home cells of the macro cell.

  Preferably, in the above method, information on all of the adjacent home cells of the first macro cell or a part of the home cells selected in the front-rear order from the arranged adjacent home cells of the first macro cell is used as the first macro base. The station transmits to the first terminal based on the air interface resource situation and / or the neighboring cell policy arrangement of the first terminal.

  Preferably, in the method, in the transmission, the network side pages the first terminal in an idle state, establishes a connection with the first terminal, and transmits information on all or part of the home cells to the first terminal. Transmitting via a connection, or the network side waits for the cell switching or reselection to occur in the first terminal, and when the cell switching or reselection occurs in the first terminal, all or part of the above Transmitting home cell information via a connection currently established by the first terminal.

  Preferably, in the above method, the first terminal in a vacant state is further arranged in accordance with the order of the order of arrangement, for all or some of the home cells transmitted from the network side, for which the order is in front. The cell search and measurement are preferentially performed, and the cell is reselected based on the measurement result.

  Preferably, in the method, the adjacent cell of the first macro cell further includes an adjacent macro cell of the first macro cell, and the first macro base station further includes a first threshold value at which a moving speed of the first terminal is a predetermined threshold value. When higher is indicated by the mobility state of the first terminal, when transmitting all or part of the home cell information, the first terminal is arranged in front of the whole or part of the home cells. Information on neighboring macrocells of one macrocell is transmitted to the first terminal, and the first terminal further transmits information on neighboring macrocells of the first macrocell and all or part of the information transmitted from the network side according to the order of rearrangement. The cell search and measurement are preferentially performed for those home cells that are arranged before, and the cells are reselected based on the measurement results.

  Preferably, in the above method, when the first terminal is in a connection state and cell switching is required, the first macro base station further performs an order of adjacent home cells of the first macro cell according to the order of rearrangement. Of these, the terminal is preferentially measured with respect to the previous one, and the terminal is controlled to execute cell switching based on the measurement result.

  Preferably, in the method, the adjacent cell of the first macro cell further includes an adjacent macro cell of the first macro cell, and the first macro base station further includes a first threshold value at which a moving speed of the first terminal is a predetermined threshold value. If higher, indicated by the mobility state of the first terminal, and if the first terminal is in a connected state and cell switching is required, before the adjacent home cell of the first macro cell according to the order of rearrangement Preferentially measure the adjacent macrocells and adjacent home cells of the first macrocell to be arranged in front of the arrangement, and control the terminal to perform cell switching based on the measurement result .

  Preferably, in the method, further comprising maintaining the mobility state of the first terminal according to a cell type, and maintaining the mobility state of the first terminal according to a cell type, Specifically, the first terminal statistics the number of cell reselection and switching that occurred within a predetermined second time, and the macro cell and home cell that the first terminal generated within the predetermined second time. Obtaining a product obtained by multiplying the sum of the number of cell reselections and switching between the cells and the number of cell reselections and switching between home cells by a predetermined weight (0 <weight <1); The terminal obtains a sum obtained by adding the product to the number of cell reselection and switching between the macro cells generated within the predetermined second time, and a size between the sum value and a plurality of predetermined thresholds. To determine the mobility state of the first terminal based on Including, the method comprising way.

  Preferably, when performing the cell switching or reselection process in the method, the first macro cell is further included in the information of all or part of the home cells transmitted from the network node. In this case, the cell switching is executed using the information of the target home cell including at least the CSG ID and the access mode.

  The present invention further provides a network node for supporting mobility management in a wireless communication network. In the network node, the neighbor of any one cell in the pre-established adjacency information table including the information of the neighboring home cell of the macro cell including the home cell in the coverage of the macro cell and the information of the neighboring home cell of the home cell Based on the switching priority maintenance unit that maintains the switching priority of each home cell based on cell reselection and switching statistical information, and the information on the switching priority and the CSG to which the terminal belongs, cell search, An optimal processing unit for controlling the terminal so as to perform a reselection and switching process.

  Preferably, in the network node, the switching priority maintenance unit determines the number of successful switching and reselection from the arbitrary one cell to each of the adjacent home cells within a predetermined first time, Based on the number of times, the switching priority of each of the neighboring home cells is set so that the switching priority of the neighboring home cell having the larger number of times becomes higher than the switching priority of the neighboring home cell having the smaller number of times.

  Preferably, in the network node, the switching priority maintenance unit further determines whether there is a switching failure from the arbitrary one cell to each of the adjacent home cells within a predetermined first time, and fails. If there is, the switching priority of each of the adjacent home cells is lowered according to a predetermined policy.

  Preferably, the network node receives information on a home cell corresponding to the home base station reported from a home base station, information on neighboring home cells of the home base station, and information on a macro cell where the home base station is located. Based on the information on the home cell corresponding to the home base station reported from each home base station, the information on the neighboring home cell of the home base station, and the information on the macro cell where the home base station is located, Equipped with adjacency maintenance unit to build and maintain.

  Preferably, in the network node, the information of the home cell corresponding to the home base station includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI, The home base station neighboring home cell information includes part or all of PCI, E-CGI, frequency point information and TAI, and the macro cell information where the home base station is located is PCI, Including some or all of E-CGI, frequency point information, and TAI, neighboring home cell information of the macro cell is one of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI. Information of neighboring home cells of the home cell includes PCI, E-CGI, CSG-ID, access mode, Includes some or all of the HeNB ID and TAI.

  Preferably, in the network node, the optimal processing unit includes the CSG home cell in which each adjacent home cell is arranged in order of higher switching priority, the non-CSG home cell in the open / hybrid mode, and the closed mode. In accordance with the order of the non-CSG home cells, the neighboring cell of the first cell where the terminal is currently located is arranged, and the cell search is performed for a cell having a previous arrangement among neighboring home cells of the first cell. The terminal is controlled to preferentially execute the reselection and switching process.

  Preferably, in the network node, the optimal processing unit is configured so that when the moving speed of the terminal is higher than a predetermined first threshold, the mobility state of the terminal indicates the order of the first cell according to the order of the arrangement. Prioritize the cell search, reselection, and switching processes for the adjacent cells of the first cell that the adjacent macro cell arranges before the adjacent home cell of the first cell, with respect to the cell that has the previous arrangement. The terminal is controlled to execute.

  Preferably, in the network node, the terminal statistics the number of cell reselection and switching occurring within a predetermined second time, and the terminal is connected between the macro cell and the home cell generated within the predetermined second time. A product obtained by multiplying the sum of the number of cell reselection / switching times and the number of cell reselection / switching times between home cells by a predetermined weight (0 <weight <1) is acquired, and the terminal obtains the predetermined number of times. Obtaining a sum obtained by adding the product to the number of cell reselections and switching between macrocells occurring within 2 hours, and determining the mobility state of the terminal based on a size between the sum and a plurality of predetermined thresholds. A mobility state maintenance unit is further provided.

  Preferably, in the network node, after the first terminal enters the coverage of the first home cell, an adjacent home cell of the first home cell and a first home base station corresponding to the first home cell are located. The network node selects information on the neighboring cells of the first home cell including the macro cell to be selected from the neighboring relationship information table, and the switching priority of the neighboring cells of the first home cell and the neighboring cells of the first home cell. A first distribution unit for transmitting the degree information to the first home base station.

  Preferably, in the network node, after the first terminal enters the coverage of the first macro cell, the information on the neighboring cells of the first macro cell including the neighboring home cell of the first macro cell is indicated by the network node. Second distribution selected from the relationship information table and transmitting information on neighboring cells of the first macro cell and information on switching priority of neighboring cells of the first macro cell to the first macro base station corresponding to the first macro cell A unit is further provided.

  As can be seen from the above description, a method and facility for supporting mobility management in a wireless communication network according to the present invention supports mobility management for a home base station by constructing an adjacency information table. Yes. Further, in the present invention, by distributing the information on the related adjacent home cell, the terminal can optimize the cell search and measurement based on the information, and improve the cell search efficiency. However, based on this information, it is possible to optimize the cell switching of the terminal and reduce the time required for the cell switching.

1 illustrates an LTE network architecture in the prior art. Two typical switching scenes in the prior art are shown. 4 shows a flow of a mobility management support method according to an embodiment of the present invention. 4 shows an example of a relationship between a macro cell and a home cell according to an embodiment of the present invention. FIG. 3 is a structural diagram of a network node for supporting mobility management in a wireless communication network according to an embodiment of the present invention;

  The present invention provides a method and equipment for supporting mobility management in a wireless communication network, and builds and maintains a neighbor relation information table based on neighbor cell information reported from a home base station. The present invention further provides a specific embodiment for optimizing UE cell search, cell reselection measurement, and cell switching measurement based on the adjacency information table. Hereinafter, the present invention will be described in detail through specific embodiments as a whole with reference to the drawings. In addition, the method and apparatus in the present invention can be applied not only to the UMTS system and the LTE system, but also to the future evolution system LTE-A of the LTE system.

<Example 1>
The present embodiment provides a method for supporting mobility management, and according to the method, the network side can acquire related information of the adjacent home base station, which effectively solves the mobility management problem of the home base station. Support. As shown in FIG. 3, the method for supporting mobility management in the wireless communication network according to the present embodiment includes the following steps.

  In step 31, each home base station in the network sends the home cell information corresponding to the home base station, the neighboring home cell information of the home base station, and the macro cell where the home base station is located to the network node. Report.

  Here, the adjacent home cell of the home base station is an adjacent home cell of the home cell corresponding to the home base station. The macro cell in which the home base station is located means that the home base station is located within the coverage of the macro cell. In the present invention, the above “adjacent” means that there is a portion overlapping the coverage between cells, and the above “adjacent home cell of the home base station” and “macro cell where the home base station is located” Are adjacent cells of the home base station.

  Here, the network node is an MME or other functional node.

  Here, during the start-up and operation, the home base station may collect information on neighboring cells by scanning using its own downlink receiver, or the measurement reported from the terminal to the own base station. Information on neighboring cells may be collected using reports, and then reported to the network node.

  Here, the home cell information corresponding to the home base station includes physical layer cell identification PCI (Physical Cell Identifier), cell global identification code E-CGI (E-UTRAN Cell Global Identifier), CSG identification (CSG-ID). , Access mode, home base station indicator (HeNB ID), and tracking area indicator TAI (Tracking Area Identifier).

  The information of the adjacent home cell of the home base station includes a part or all of PCI, E-CGI, frequency point information, and TAI.

  The information of the macro cell where the home base station is located includes part or all of PCI, E-CGI, frequency point information, and TAI.

  In step 32, the network node reports the home cell information corresponding to the home base station reported from each home base station, the neighboring home cell information of the home base station, and the macro cell where the home base station is located. Collectively, an adjacency information table is constructed and maintained based on this. The adjacency information table includes information on adjacent home cells of the macro cell and information on adjacent home cells of the home cell. The adjacent home cell of the macro cell includes a home cell in the coverage of the macro cell.

  Here, the information of the adjacent home cell of the macro cell includes PCI, E-CGI, CSG-ID, access mode, HeNB ID, TAI, and the like. The information on the adjacent home cell of the home cell includes PCI, E-CGI, CSG-ID, access mode, HeNB ID, TAI, and the like.

  In step 32, the network node reports information about the home cell corresponding to the home base station reported from each home base station, information about neighboring home cells of the home base station, and information about a macro cell where the home base station is located. To collect all the home cells in the coverage of each macro cell, and based on the detailed information of the home cell corresponding to the home base station reported from each home base station, in the coverage of each macro cell Build detailed information for all home cells. The detailed information specifically includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI. Similar detailed information is constructed for adjacent home cells of each home cell.

  In step 33a, the network node selects information on the neighboring cell of the first macro cell from the neighboring relationship information table, and sets the information on the neighboring cell of the first macro cell to the first macro cell. Transmit to the corresponding first macro base station. The adjacent cell of the first macro cell includes the adjacent home cell of the first macro cell.

  In step 33b, the network node selects information on the neighboring cell of the first home cell from the neighboring relationship information table, and selects the information on the neighboring cell of the first home cell as the first home cell. Transmit to the first home base station corresponding to the home cell. Note that the neighboring cells of the first home cell include the neighboring home cell of the first home cell and the macro cell in which the first home base station is located.

  As can be seen from the above description, according to the present embodiment, the network node can acquire detailed information of the neighboring home cell of each cell, and further obtains detailed information of the corresponding neighboring cell from the macro base station / home. It can be delivered to the base station, thereby providing support for mobility management of the home base station. The following examples describe how to use this information to support mobility management.

<Example 2>
This embodiment is implemented based on the adjacency information table constructed in the first embodiment, and the network side further sets the switching priority for the adjacent home cell in the adjacency information table. Priorities are arranged based on The network side here may be the network node in the first embodiment, or may be a macro base station or a home base station.

  The adjacency information table includes information on adjacent home cells of the macro cell and information on adjacent home cells of the home cell. For any one cell (macro cell or home cell) in the adjacency information table, the adjacency information table includes information on all adjacent home cells of the arbitrary cell. As shown in FIG. 4, as an example, for macro cell 1, the adjacent home cells are home cells 1 to 9. For home cell 2, its adjacent home cells are home cells 1, 3, 4.

  In this embodiment, for each adjacent home cell of any one cell in the adjacent relationship information table, the number of times of successful switching from the arbitrary one cell to each of the adjacent home cells within a predetermined first time. Each switching priority of the neighboring home cells is calculated so that the switching priority of the neighboring home cell having the higher number of times is higher than the switching priority of the neighboring home cell having the lower number of times based on the number of times. Set.

For example, the predetermined first time is 2 hours.
For the adjacent home cell 1 of the macro cell 1, the number of times of successful switching from the macro cell 1 to the home cell 1 within the two hours is statistically obtained to obtain the number of times 1.
For the adjacent home cell 2 of the macro cell 1, the number of successful switching from the macro cell 1 to the home cell 2 within the two hours is statistically obtained to obtain the number of times 2.
For the adjacent home cell 3 of the macro cell 1, the number of times of successful switching from the macro cell 1 to the home cell 3 within the two hours is statistically obtained to obtain the number of times 3.
......
For the adjacent home cell 9 of the macro cell 1, the number of successful switching from the macro cell 1 to the home cell 9 within the two hours is statistically obtained to obtain the number of times 9.
When the above number of times 1> number of times 2> number of times 3>. The specific switching priority can be indicated by a number.

  Of course, a plurality of threshold values may be set in advance. The higher threshold is made to correspond to the higher switching priority, the number of times of each adjacent home cell is compared with the plurality of thresholds, the maximum threshold value is found from the threshold values smaller than the above number, and the switching corresponding to the maximum threshold value is performed. The priority is the switching priority of the adjacent home cell.

  In this embodiment, after setting the switching priority of each adjacent home cell based on the above number of times, the network node further includes each of the adjacent home cells from the arbitrary one cell within the predetermined first time. Determine if there was a failure to switch to. If there is a failure, the switching priority of each adjacent home cell is lowered according to a predetermined policy. The predetermined policy can be set by itself. For example, if switching to a certain neighboring home cell fails, the switching priority of the neighboring home cell is lowered by one rank, or the switching priority of the neighboring home cell is set to the lowest numerical value, or the neighboring home cell is switched to a cell. It is prohibited to be a target cell.

<Example 3>
In the present invention, based on the switching priority of the second embodiment, it is arranged based on the switching priority, and then, in order to optimize the measurement performed for cell search and cell reselection, the empty state is set. For a certain terminal, it is necessary for the network side to select an adjacent home cell with a previous arrangement from the adjacent relation information table and transmit it to the terminal. For the terminal in the connection state, the network side controls the terminal to perform measurement preferentially for the cell in the adjacent home cell with the previous arrangement based on the adjacency information table and the switching priority. To do.

  In the present invention, the network node or base station (macro base station or home base station) can control the terminal to perform an optimized cell search, reselection and switching process. In this embodiment, a network node will be described as an example.

  In this embodiment, since the network node stores the adjacent relationship information table and the switching priority information, the network node directly stores information on the neighboring cell of the cell where the terminal is currently located, the terminal The terminal can be controlled to execute the cell search, reselection, and switching process based on information on the switching priority of the neighboring cell of the first cell where the current location is and information on the CSG to which the terminal belongs.

  Here, the control of the terminal to perform the cell search, reselection, and switching process is specifically performed as follows.

  In accordance with the front-to-back order of the CSG home cell in which each adjacent home cell is arranged in the order of switching priority, the non-CSG home cell in the open / hybrid mode, and the non-CSG home cell in the closed mode, Arrange adjacent home cells.

  The network node controls the terminal to preferentially execute the cell search, reselection, and switching process for a cell that is previously arranged among neighboring home cells of the first cell. Here, the network node arranges among adjacent cells of the first cell according to the order of the arrangement according to the order of arrangement, if the mobility state of the terminal indicates that the moving speed of the terminal is higher than a predetermined first threshold. The terminal is controlled so as to preferentially execute the cell search, reselection and switching processes for a cell preceded by a cell. The adjacent cell of the first cell includes an adjacent home cell and an adjacent macro cell of the first cell. Among the neighboring cells of the first cell, the neighboring macro cell of the first cell is arranged before the neighboring home cell of the first cell.

  In this embodiment, when the terminal is controlled to perform the cell search, reselection and switching process, the network node further determines that the terminal of the terminal when the moving speed of the terminal is higher than a predetermined first threshold. When indicated by the mobility state, the cell search, reselection, and switching processes are preferentially performed on the cells that are in the front of the first cell among the neighboring cells of the first cell according to the order of the rearrangement. Control the terminal. Among the neighboring cells of the first cell, the neighboring macro cell of the first cell is arranged before the neighboring home cell of the first cell.

<Example 4>
In this embodiment, the network node or base station (macro base station or home base station) can control the terminal to perform the optimized cell search, reselection and switching process.

  In this embodiment, when the base station controls the terminal to perform the optimized cell search, reselection and switching process, for example, the cell search in which the first home base station corresponding to the first home cell is optimized, When performing the reselection and switching process, the network node selects information on neighboring cells of the first home cell from the neighboring relationship information table, and information on neighboring cells of the first home cell and the first home. Information on the switching priority of adjacent cells of the cell is transmitted to the first home base station. The neighboring cell of the first home cell includes a neighboring home cell of the first home cell and a macro cell in which the first home base station is located. Then, the first home base station is associated with the information on the neighboring cell of the first home cell, the information on the switching priority of the neighboring cell of the first home cell, and the first terminal located in the first home cell. Based on the information of the first CSG, the first terminal is controlled to execute the cell search, reselection and switching processes.

  In this embodiment, when the optimized cell search, reselection, and switching process is performed by the first macro base station corresponding to the first macro cell, the network node stores information on neighboring cells of the first macro cell. And selecting from the adjacency information table, and transmitting information on the neighboring cells of the first macro cell and information on switching priority of the neighboring cells of the first macro cell to the first macro base station. The neighboring cell of the first macro cell includes the neighboring home cell of the first macro cell. Then, the first macro base station receives information on neighboring cells of the first macro cell, information on switching priority of neighboring cells of the first macro cell, and a first CSG to which the first terminal located in the first macro cell belongs. Based on the information, the first terminal is controlled to perform the cell search, reselection and switching processes. Here, when the first terminal is controlled to execute the cell search, reselection, and switching processes, the following procedure is specifically performed.

  1) After the first terminal enters the coverage of the first macro cell, the first macro base station acquires the information of the first CSG to which the first terminal belongs and the information of each adjacent home cell of the first macro cell. Based on the switching priority, adjacent home cells of the first macro cell are arranged. According to the front-to-back order of the first CSG home cell in which each adjacent home cell is arranged in order of higher switching priority, the non-first CSG home cell in open / hybrid mode, and the non-first CSG home cell in closed mode, The adjacent home cells of one macro cell are arranged.

  2) Then, based on the air interface resource status and / or the neighboring cell policy arrangement of the first terminal, the first macro base station receives information on all or part of the neighboring home cells of the first macro cell, Transmit to the first terminal. The part of the home cells are selected in the front-back order from the adjacent home cells of the arranged first macro cell.

  Here, at the time of the transmission, the network side pages the first terminal in an idle state, establishes a connection with the first terminal, and transmits all or part of the home cell information via the connection. Send. Alternatively, the network side waits for the occurrence of switching or reselection of the cell of the first terminal, and when the switching or reselection of the cell of the first terminal occurs, the information on all or part of the home cells is stored in the first terminal. One terminal transmits it through a connection that is currently established.

  3) The first terminal in the idle state further performs cell search for all or a part of the home cells transmitted from the network side in front of the rearrangement according to the order of the rearrangement. Prioritize measurement and reselect a cell based on the measurement result. When the first terminal is in a connection state and the cell needs to be switched, the first macro base station further arranges one of the adjacent home cells of the first macro cell in the front-to-back order. In contrast, the terminal is controlled to perform measurement preferentially and to perform cell switching based on the measurement result.

  In the present embodiment, when the first terminal is controlled to execute the cell search, reselection and switching processes, the following is further performed.

  For cell reselection, the first macro base station may further include all or part of the first terminal if the mobility state of the first terminal indicates that the movement speed of the first terminal is higher than a predetermined first threshold. When transmitting the home cell information, the information of the neighboring macro cell of the first macro cell is further transmitted to the first terminal. The adjacent macro cells of the first macro cell are arranged in front of all or some of the home cells. The first terminal, according to the order of the arrangement, the neighboring macrocell information of the first macrocell transmitted from the network side and the whole or a part of the home cells, with the arrangement in front, Cell search and measurement are performed with priority, and cell reselection is performed based on the measurement results.

  For cell switching, the first macro base station further indicates the mobility state of the first terminal when the moving speed of the first terminal is higher than a predetermined first threshold, and the first terminal connects to the first macro base station. If it is in a state and the cell needs to be switched, according to the order of the arrangement, the first macro cell adjacent macro cell and the adjacent home cell are preferentially measured for the one with the arrangement in front, and the measurement result Based on the above, the terminal is controlled to perform cell switching. The neighboring macro cells of the first macro cell are arranged before the neighboring home cells of the first macro cell.

  In order to make the above arrangement method easier to understand, it will be further described with reference to FIG. Assuming that the first terminal enters the coverage of the macro cell 1, the CSG to which the first terminal belongs is CSG1, and the switching priority of the adjacent home cells 1 to 9 of the macro cell 1 decreases, that is, the home cell 1 Has the highest switching priority, and the home cell 9 has the lowest switching priority. The CSG to which each home cell belongs and the operation method are as shown in FIG. The home cells 1 to 9 are arranged by the above arrangement method.

  First, home cells 1 to 9 are divided into three groups according to CSG1 home cells, non-CSG1 home cells in open / hybrid mode, and non-CSG1 home cells in closed mode.

  The first set is a home cell of CSG 1 and includes home cells 3, 7, and 8.

  The second set is a non-CSG1 home cell in open / hybrid mode, and includes home cells 5, 6, and 9.

  The third set is a non-CSG1 home cell in closed mode, and includes home cells 1, 2, and 4.

Then, in each group, they are arranged in descending order of switching priority. Since the switching priorities of the home cells 1 to 9 are gradually decreased, the final arrangement result is as follows.
Home cell 3, 7, 8, 5, 6, 9, 1, 2, 4

  When the arrangement of the adjacent home cells of the first macro cell is completed, the network side (for example, the first macro base station) transmits information on all or a part of the home cells adjacent to the first macro cell, the air interface resource status, and / Or based on the neighbor cell policy arrangement of the first terminal, to transmit to the first terminal. The part of the home cells are selected in the front-back order from the adjacent home cells of the arranged first macro cell. For example, when there is no room for air interface resources, information on some home cells can be transmitted. On the contrary, when there is a surplus in the air interface resource, information of all home cells can be transmitted. For example, when the neighboring cell policy arrangement of the first terminal indicates that a predetermined number of neighboring cell information can be received, information on the corresponding number of home cells is transmitted.

  In the present embodiment, when the first terminal is in an idle state, the first terminal searches for and measures a cell based on the information of all or part of the home cells distributed on the network side, and based on the measurement result, Reselection can be made. For cell search in the prior art, LTE and LTE-A support the terminal to perform autonomous search, thereby increasing the UE's ability, but resulting in low efficiency in cell search and its measurement Yes. In a present Example, the efficiency of a search can be improved because the information of a suitable home cell is provided and UE searches based on this.

  In the present embodiment, when the first terminal is in a connection state and cell switching is necessary, the current service cell of the first terminal is further arranged in the previous home cell among the adjacent home cells of the first macro cell. The terminal is controlled to preferentially measure a certain home cell, and the cell is reselected based on the measurement result. In addition, during the execution of the cell switching in the present embodiment, the current service cell further determines the cell by the target home cell information included in the information on all or part of the home cells transmitted from the network side. Perform switching. The information on the target home cell includes at least a CSG ID and an access mode. Since the information of the target home cell is stored in the current service cell or network node before switching, the current service cell does not need to be acquired again from the base station corresponding to the target home cell via signaling after the switching occurs Therefore, according to the present embodiment, the switching time can be shortened.

<Example 5>
In this embodiment, in order to optimize the cell reselection and the switching process, the mobility state of the terminal is further considered based on the fourth embodiment, and the information on the neighboring cells is provided to the UE in the idle state. Decide how to distribute or how to control the measurement target of the UE in the connection state.

  After entering the coverage of the first macro cell for the first terminal in the idle state, the network side (for example, the first macro base station) further determines the mobility state of the first terminal. When the mobility state of the first terminal indicates that the moving speed of the first terminal is higher than a predetermined first threshold, the first macro cell is further transmitted when transmitting all or part of the home cell information. The information of the neighboring macro cell is transmitted to the first terminal. The adjacent macro cells of the first macro cell are arranged in front of all or some of the home cells. The first terminal, in accordance with the order of the rearrangement, the neighboring macrocell information of the first macrocell transmitted from the network side and all or some of the home cells, with respect to the cell with the previous order, Cell search and measurement are performed with priority, and cell reselection is performed based on the measurement results. For example, when the predetermined first threshold corresponds to a high-speed movement state, in this embodiment, the terminal preferentially transmits macrocell information during high-speed movement, and preferentially stays in the macrocell. On the other hand, when the terminal is in a low speed or medium speed movement state, the information of all or part of the home cells is directly transmitted, that is, the home cell information is preferentially transmitted. The transmission process follows the method in Example 4.

  After entering the coverage of the first macro cell for the first terminal in the connection state, the network side (for example, the first macro base station) further determines the mobility state of the first terminal. If the mobility state of the first terminal indicates that the moving speed of the first terminal is higher than a predetermined first threshold, and the first terminal is in a connection state and cell switching is required, According to the order, the first macro cell adjacent macro cell and the adjacent home cell are preferentially measured with respect to the cell with the previous order in the order of the rearrangement, and the switching of the cells is executed based on the measurement result. The terminal is controlled as follows. The adjacent macrocells of the first macrocell are arranged in front of the adjacent home cells of the first macrocell. In this way, when the terminal is moving at high speed, in this embodiment, the terminal can be controlled to preferentially switch to the macro cell instead of the home cell in order to avoid frequent cell switching.

  In the present embodiment, when determining the movement state of the first terminal, it is considered that the coverage of the home cell is smaller than the coverage of the normal macro base station. Therefore, in the present embodiment, it is preferable to determine the movement state of the first terminal by the following method so that the current movement state of the terminal can be more reliably reflected.

  The network side statistics the number of cell reselection and switching that the first terminal has occurred within a predetermined second time.

  The sum of the number of cell reselections and switching between the macro cell and the home cell generated by the first terminal within the predetermined second time and the number of cell reselections and switching between the home cells is a predetermined weight ( Get product multiplied by 0 <weight <1). In an actual application, the weight value can be set according to the coverage ratio between the home cell and the macro cell.

  The first terminal obtains a sum obtained by adding the product to the number of cell reselections and switching between macrocells occurring within the predetermined second time.

  The mobility state of the first terminal is determined based on a size between the sum value and a plurality of predetermined threshold values.

  For example, when the sum is equal to or greater than a predetermined first threshold, the mobility state of the first terminal is determined to be a high-speed movement state.

  If the sum is less than or equal to a predetermined second threshold, the mobility state of the first terminal is determined to be a normal speed movement state.

  When the sum is larger than the predetermined second threshold and smaller than the predetermined first threshold, the mobility state of the first terminal is determined to be a medium speed movement state.

  Here, the predetermined first threshold value is larger than the predetermined second threshold value.

<Example 6>
Based on each of the above embodiments, this embodiment provides a corresponding facility for performing the method described in the above embodiments.

  As shown in FIG. 5, the present embodiment provides a network node for supporting mobility management in a wireless communication network.

  The network node includes a neighbor of any one cell in a pre-established neighbor relation information table including information on a neighboring home cell of a macro cell including a home cell in the coverage of the macro cell and information on a neighboring home cell of the home cell. Based on the switching priority maintenance unit that maintains the switching priority of each home cell based on cell reselection and switching statistical information, and the information on the switching priority and the CSG to which the terminal belongs, cell search, An optimal processing unit for controlling the terminal so as to perform a reselection and switching process.

  Here, the switching priority maintenance unit determines the number of successful switching and reselection from the one arbitrary cell to each of the adjacent home cells within a predetermined first time, and based on the number of times The switching priority of each of the adjacent home cells is set so that the switching priority of the adjacent home cell having the higher number of times becomes higher than the switching priority of the adjacent home cell having the lower number of times.

  The switching priority maintenance unit further determines whether there has been a switching failure from the arbitrary one cell to each of the adjacent home cells within a predetermined first time. The switching priority of each cell is lowered according to a predetermined policy.

  Preferably, the network node receives information on a home cell corresponding to the home base station reported from a home base station, information on neighboring home cells of the home base station, and information on a macro cell where the home base station is located. Based on the information on the home cell corresponding to the home base station reported from each home base station, the information on the neighboring home cell of the home base station, and the information on the macro cell where the home base station is located, Equipped with adjacency maintenance unit to build and maintain.

  Here, the home cell information corresponding to the home base station includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI. The adjacent home cell information includes part or all of PCI, E-CGI, frequency point information and TAI, and the macro cell where the home base station is located includes PCI, E-CGI, frequency Point information and part or all of TAI are included, and adjacent home cell information of the macro cell includes part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID and TAI. The information on the home cell adjacent to the home cell includes PCI, E-CGI, CSG-ID, access mode, HeNB ID, and part of TAI. It includes all.

  Preferably, in the network node, the optimal processing unit includes the CSG home cell in which each adjacent home cell is arranged in order of higher switching priority, the non-CSG home cell in the open / hybrid mode, and the closed mode. In accordance with the order of the non-CSG home cells, the neighboring cell of the first cell where the terminal is currently located is arranged, and the cell search is performed for a cell having a previous arrangement among neighboring home cells of the first cell. The terminal is controlled to preferentially execute the reselection and switching process.

  Preferably, the optimum processing unit is configured such that, when the mobility state of the terminal indicates that the moving speed of the terminal is higher than a predetermined first threshold, the neighboring macrocells of the first cell follow the first order in the order of arrangement. The cell search, reselection, and switching processes are performed preferentially for the cells that are arranged in front of the neighboring cells of the first cell that are arranged before the adjacent home cell of one cell. Control the terminal.

  Preferably, in the network node, the terminal statistics the number of cell reselection and switching occurring within a predetermined second time, and the terminal is connected between the macro cell and the home cell generated within the predetermined second time. A product obtained by multiplying the sum of the number of cell reselection / switching times and the number of cell reselection / switching times between home cells by a predetermined weight (0 <weight <1) is acquired, and the terminal obtains the predetermined number of times. Obtaining a sum obtained by adding the product to the number of cell reselections and switching between macrocells occurring within 2 hours, and determining the mobility state of the terminal based on a size between the sum and a plurality of predetermined thresholds. A mobility state maintenance unit is further provided.

  A first home cell including a macro cell in which a neighboring home cell of the first home cell and a first home base station corresponding to the first home cell are located after the first terminal enters the coverage of the first home cell; The network node selects the neighboring cell information from the neighboring relationship information table, and the neighboring cell information of the first home cell and the switching priority information of the neighboring cell of the first home cell are Transmitting information to the base station, selecting neighboring cell information of the first macro cell including the neighboring home cell of the first macro cell from the neighboring relationship information table, and selecting neighboring cell information of the first macro cell as the first macro cell. And / or a neighboring home cell of the first home cell and a macro cell in which the first home base station is located. Information on the neighboring cell of the first home cell is selected from the neighboring relationship information table, and information on the neighboring cell of the first home cell is transmitted to the first home base station corresponding to the first home cell. 1 distribution unit.

  After the first terminal enters the coverage of the first macro cell, the network node selects information of neighboring cells of the first macro cell including the neighboring home cell of the first macro cell from the neighboring relationship information table, and The information processing apparatus further includes a second distribution unit that transmits information on neighboring cells of the first macro cell and information on switching priority of neighboring cells of the first macro cell to a first macro base station corresponding to the first macro cell.

  To summarize the above description, a method and facility for supporting mobility management in a wireless communication network according to an embodiment of the present invention provides mobility management of a home base station to improve cell search and measurement efficiency. At the same time, the time for cell reselection and switching can be shortened.

  Methods and equipment for supporting mobility management in a wireless communication network according to embodiments of the present invention are not limited to the operations listed in the specification and embodiments, and are fully applicable to various fields to which the present invention is applicable. Can be applied. It is easy for those who are familiar with this field to realize other benefits and perform corrections. Accordingly, without departing from the spirit or scope of the general concept that is limited in the claims and their equivalents, the present invention is not limited to the specific details, representative equipment and The present invention is not limited to the example using the drawings.

Claims (29)

In a method for supporting mobility management in a wireless communication network,
Each of the adjacent home cells of any one cell in the pre-established adjacency information table including information on the adjacent home cell of the macro cell including the home cell in the coverage of the macro cell and information on the adjacent home cell of the home cell Maintaining switching priorities based on cell reselection and switching statistics,
Controlling the terminal to perform a cell search, reselection and switching process based on the switching priority and information of the CSG to which the terminal belongs;
A method comprising the steps of: In maintaining the switching priority of each of the adjacent home cells based on statistical information of cell reselection and switching,
Judge the number of successful switching and reselection from any one cell to each of the neighboring home cells within a predetermined first time, and based on the number of times, the switching priority of the neighboring home cells with a large number of times Setting the switching priority of each of the adjacent home cells so that the degree is higher than the switching priority of the adjacent home cell with a small number of times,
The method of claim 1, comprising: In maintaining the switching priority of each of the adjacent home cells based on cell reselection and switching statistical information,
It is determined whether there has been a failure to switch from the arbitrary one cell to each of the adjacent home cells within a predetermined first time. If there is a failure, the switching priority of each of the adjacent home cells is set to a predetermined value. Lowering according to policy,
The method of claim 2 comprising: In constructing the adjacency information table,
Receiving information on a home cell corresponding to the home base station reported from a home base station, information on neighboring home cells of the home base station, and information on a macro cell where the home base station is located;
Construct an adjacency information table based on the home cell information reported from each home base station, information on the neighboring home cell of the home base station, and information on the macro cell where the home base station is located. Maintenance and maintenance,
The method of claim 1, comprising: The information of the home cell corresponding to the home base station includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI,
The adjacent home cell information of the home base station includes a part or all of PCI, E-CGI, frequency point information, and TAI,
The information of the macro cell where the home base station is located includes a part or all of PCI, E-CGI, frequency point information, and TAI.
The information of the adjacent home cell of the macro cell includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI,
The method according to claim 4, wherein the information of the neighboring home cell of the home cell includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI. The adjacency information table and the switching priority information are stored in a network node on the network side,
Further, the network node is based on information on neighboring cells of the cell in which the terminal is currently located, information on switching priority of neighboring cells in the first cell in which the terminal is currently located, and information on CSG to which the terminal belongs. 5. The method of claim 4, wherein the terminal is controlled to perform the cell search, reselection and switching process. In controlling the terminal to perform the cell search, reselection and switching process,
In accordance with the front-to-back order of the CSG home cell in which each adjacent home cell is arranged in the order of switching priority, the non-CSG home cell in the open / hybrid mode, and the non-CSG home cell in the closed mode, Arranging adjacent home cells;
The network node controls the terminal to preferentially execute the cell search, reselection, and switching process for a cell that is previously arranged among neighboring home cells of the first cell;
The method of claim 6, comprising: In controlling the terminal to perform the cell search, reselection and switching process,
When the network node indicates that the mobility speed of the terminal is higher than a predetermined first threshold according to the mobility state of the terminal, the neighboring macro cell of the first cell is adjacent to the first cell according to the order of rearrangement. The terminal is controlled to preferentially execute the cell search, reselection, and switching processes for the cells that are arranged in front of the first cell arranged in front of the home cell. thing,
The method of claim 7, comprising: The adjacency information table and the switching priority information are stored in a network node on the network side,
The network node includes information on neighboring cells of the first home cell including a neighboring home cell of the first home cell and a macro cell in which a first indoor base station corresponding to the first home cell is located. The information on the neighboring cell of the first home cell and the information on the switching priority of the neighboring cell of the first home cell are transmitted to the first home base station,
Further, the first home base station includes information on neighboring cells of the first home cell, information on switching priority of neighboring cells of the first home cell, and a first terminal entering the first home cell. The method according to claim 4, wherein the first terminal is controlled to perform the cell search, reselection and switching process based on information of the first CSG. The adjacency information table and the switching priority information are stored in a network node on the network side,
The network node selects information on neighboring cells of the first macro cell including neighboring home cells of the first macro cell from the neighboring relationship information table, and information on neighboring cells of the first macro cell and neighboring of the first macro cell. Cell switching priority information is transmitted to the first macro base station corresponding to the first macro cell;
Further, the first macro base station includes information on neighboring cells of the first macro cell, information on switching priority of neighboring cells of the first macro cell, and information on the first CSG to which the first terminal entering the first macro cell belongs. 5. The method of claim 4, wherein the first terminal is controlled to perform the cell search, reselection and switching process based on information. In controlling the first terminal to perform the cell search, reselection and switching process,
After the first terminal enters the coverage of the first macro cell, the first macro base station obtains the information of the first CSG to which the first terminal belongs and the switching priority of each adjacent home cell of the first macro cell. Arranging adjacent home cells of the first macrocell based on the degree;
According to the front-to-back order of the first CSG home cell in which each adjacent home cell is arranged in order of higher switching priority, the non-first CSG home cell in open / hybrid mode, and the non-first CSG home cell in closed mode, Arranging adjacent home cells of one macro cell;
The method of claim 10, comprising:   The first macro base station provides information on all the adjacent home cells of the first macro cell or a part of the home cells selected in order from the adjacent home cell of the arranged first macro cell. And / or transmitting to the first terminal based on a neighboring cell policy arrangement of the first terminal. In the above transmission,
The network side pages the first terminal in an idle state, establishes a connection with the first terminal, and transmits all or part of home cell information via the connection, or
The network side waits for the occurrence of cell switching or reselection to the first terminal, and when the cell switching or reselection occurs to the first terminal, the information on all or part of the home cells is transmitted to the first terminal. Send over the currently established connection,
The method of claim 12, comprising:   The first terminal in the vacant state further performs cell search and measurement on all or a part of the home cells transmitted from the network side in front of the rearrangement according to the order of the rearrangement. The method according to claim 12, wherein the method is preferentially performed and cell reselection is performed based on a measurement result. The neighboring cell of the first macro cell further includes a neighboring macro cell of the first macro cell,
The first macro base station may further include information on all or part of the home cells when the mobility state of the first terminal indicates that the movement speed of the first terminal is higher than a predetermined first threshold. When transmitting, further transmitting information of neighboring macrocells of the first macrocell arranged in front of all or some of the home cells to the first terminal,
The first terminal is further in accordance with the order of the arrangement, the neighboring macrocell information of the first macrocell transmitted from the network side and the whole or a part of the home cells, with the arrangement in front, The method according to claim 14, wherein cell search and measurement are preferentially performed, and cell reselection is performed based on a measurement result.   When the first terminal is in a connection state and the cell needs to be switched, the first macro base station further arranges one of the adjacent home cells of the first macro cell in the front-to-back order. The method according to claim 12, wherein the terminal is controlled to perform measurement with priority on the basis of the measurement result and to perform cell switching based on the measurement result. The neighboring cell of the first macro cell further includes a neighboring macro cell of the first macro cell,
The first macro base station is further indicated by the mobility state of the first terminal when the moving speed of the first terminal is higher than a predetermined first threshold, and the first terminal is in a connection state and the cell When switching is required, priority is given to the adjacent macro cell and the adjacent home cell of the first macro cell arranged in front of the adjacent home cell of the first macro cell according to the order of the arrangement in the order before and after the arrangement. The method according to claim 16, wherein the terminal is controlled to perform cell switching based on the measurement result. Further comprising maintaining a mobility state of the first terminal according to a cell type;
In maintaining the mobility state of the first terminal according to the cell type, specifically,
Statistics the number of cell reselection and switching that the first terminal has occurred within a predetermined second time;
The sum of the number of cell reselections and switching between the macro cell and the home cell generated by the first terminal within the predetermined second time and the number of cell reselections and switching between the home cells is a predetermined weight ( Obtaining a product multiplied by 0 <weight <1);
The first terminal obtains a sum obtained by adding the product to the number of cell reselections and switching between macrocells occurring within the predetermined second time;
18. The method according to claim 15 or 17, further comprising: determining a mobility state of the first terminal based on a magnitude between the sum value and a plurality of predetermined threshold values. the method of.   When performing the cell switching or reselection process, the first macro cell is further included in the information of all or part of the home cells transmitted from the network node, and includes at least a CSG ID. 19. The method according to claim 18, wherein cell switching is performed using information on a target home cell including an access mode and an access mode. In a network node for supporting mobility management in a wireless communication network,
Each of the adjacent home cells of any one cell in the pre-established adjacency information table including information on the adjacent home cell of the macro cell including the home cell in the coverage of the macro cell and information on the adjacent home cell of the home cell A switching priority maintenance unit for maintaining switching priority based on cell reselection and switching statistical information;
An optimal processing unit that controls the terminal to perform a cell search, reselection and switching process based on the switching priority and the information of the CSG to which the terminal belongs;
A network node comprising: The switching priority maintenance unit is
Judge the number of successful switching and reselection from any one cell to each of the neighboring home cells within a predetermined first time, and based on the number of times, the switching priority of the neighboring home cells with a large number of times 21. The network node according to claim 20, wherein the switching priority of each of the adjacent home cells is set so that the degree is higher than the switching priority of the adjacent home cell with a small number of times. The switching priority maintenance unit further includes:
It is determined whether there has been a failure to switch from the arbitrary one cell to each of the adjacent home cells within a predetermined first time. If there is a failure, the switching priority of each of the adjacent home cells is set to a predetermined value. The network node according to claim 21, wherein the network node is lowered according to the policy.   Receives information on the home cell corresponding to the home base station reported from the home base station, information on the neighboring home cell of the home base station, and information on the macro cell where the home base station is located, and is reported from each home base station. An adjacency maintenance unit that builds and maintains an adjacency information table based on information on the home cell corresponding to the home base station, information on an adjacent home cell of the home base station, and information on a macro cell in which the home base station is located The network node according to claim 20, comprising: The information of the home cell corresponding to the home base station includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI,
The adjacent home cell information of the home base station includes part or all of PCI, E-CGI, frequency point information, and TAI,
The information of the macro cell where the home base station is located includes a part or all of PCI, E-CGI, frequency point information, and TAI.
The adjacent home cell information of the macro cell includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI.
The network node according to claim 23, wherein the information of the neighboring home cell of the home cell includes a part or all of PCI, E-CGI, CSG-ID, access mode, HeNB ID, and TAI. . The optimum processing unit is
In accordance with the front-to-back order of the CSG home cell in which each adjacent home cell is arranged in the order of higher switching priority, the non-CSG home cell in the open / hybrid mode, and the non-CSG home cell in the closed mode, Arranging adjacent home cells of the first cell in which they are located;
24. The terminal is controlled to preferentially execute the cell search, reselection, and switching process for a cell that is arranged in front of neighboring home cells of the first cell. The network node described in. The optimum processing unit is
If the terminal mobility is higher than a predetermined first threshold, as indicated by the mobility state of the terminal, the neighboring macro cell of the first cell is placed in front of the neighboring home cell of the first cell according to the rearrangement order. The terminal is controlled so as to preferentially execute the cell search, reselection, and switching process for a cell preceding the first cell among the first cells to be arranged. The network node according to claim 25.   The terminal statistics the number of times of cell reselection and switching that occurred within a predetermined second time, and the number of times of cell reselection and switching between the macro cell and the home cell that occurred within the predetermined second time. A product obtained by multiplying the sum of the cell reselection / switching times between home cells by a predetermined weight (0 <weight <1), and between the macro cells generated by the terminal within the predetermined second time A mobility state maintenance unit that obtains a sum obtained by adding the product to the number of times of cell reselection and switching, and determines the mobility state of the terminal based on a size between the sum and a plurality of predetermined thresholds The network node according to claim 26, further comprising:   A first home cell including a macro cell in which a neighboring home cell of the first home cell and a first home base station corresponding to the first home cell are located after the first terminal enters the coverage of the first home cell; The network node selects the neighboring cell information from the neighboring relationship information table, and the neighboring cell information of the first home cell and the switching priority information of the neighboring cell of the first home cell are The network node according to claim 23, further comprising a first distribution unit for transmitting to a base station.   After the first terminal enters the coverage of the first macro cell, the network node selects information of neighboring cells of the first macro cell including the neighboring home cell of the first macro cell from the neighboring relationship information table, and A second distribution unit for transmitting information on neighboring cells of the first macro cell and information on switching priority of neighboring cells of the first macro cell to a first macro base station corresponding to the first macro cell; The network node according to claim 23.

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