KR101399247B1 - Apparatus and method for cell selection to home cell or private network in wireless system - Google Patents

Abstract

The present invention provides an apparatus and method for selecting a cell from a home cell or a private network cell accessible only by a specific terminal or a specific terminal group in a mobile communication system.
The present invention performs cell selection by confirming whether a candidate cell belongs to a list including information on a home cell or a private network cell accessible only by at least one specific terminal stored in the candidate cell.
Further, the present invention has the advantage of providing reliability and tampering efficiency for cell selection by performing priority assignment of the candidate cells.

Description

[0001] APPARATUS AND METHOD FOR CELL SELECTION TO HOME CELL OR PRIVATE NETWORK IN WIRELESS SYSTEM [0002]

The present invention relates to a mobile communication system, and more particularly, to a mobile communication system in which a home cell or a private network, in which public cells and cells corresponding to a private network are mixed, Apparatus and method.

The Universal Mobile Telecommunications System (UMTS) system is based on Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), which are European mobile telecommunication systems, and includes a Wideband Code Division Multiple Access CDMA "), which is a third-generation asynchronous mobile communication system.

The 3GPP, which is in charge of UMTS standardization, is discussing LTE (Long Term Evolution) system as a next generation mobile communication system of UMTS system.

The LTE system is a technology that realizes high-speed packet-based communication with a transfer rate of up to 100 Mbps with the target of commercialization in 2010 or so.

Various communication schemes are being discussed for this purpose. For example, there are discussions such as reducing the number of nodes located on the communication path by simplifying the structure of the network, and approaching wireless protocols to the wireless channel as much as possible.

FIG. 1 illustrates an example of a structure of an evolved UMTS mobile communication system to which the present invention is applied.

Referring to FIG. 1, an Evolved UMTS Radio Access Network (hereinafter referred to as 'E-UTRAN') 110 includes an Evolved Node B (hereinafter referred to as 'ENB') 120, 122, 124, 126, 128, and anchor nodes 130, 132, respectively.

A user equipment (UE) 101 is connected to an Internet Protocol (hereinafter, referred to as 'IP') network by an E-UTRAN 110. The ENBs 120 to 128 correspond to a node ratio (Node B) defined in the UMTS system and are connected to the UE 101 through a radio channel. The ENBs 120-128 perform a more complex role than the conventional NodeB.

In the LTE system, all user traffic including real-time services such as Voice over IP (VoIP) through the Internet protocol is provided through a shared channel.

Therefore, an apparatus for collecting and scheduling the situation information of a plurality of UEs is required, and the ENBs 120 to 128 take charge of the apparatuses. One ENB typically controls multiple cells. In addition, the ENB performs adaptive modulation and coding (AMC) for determining a modulation scheme and a channel coding rate according to a channel state of a mobile station.

In addition, a service supporting UMTS High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA) As in the case of a system supporting an Enhanced Dedicated Channel (E-DCH), a hybrid ARQ (hereinafter referred to as " hybrid ARQ ") is provided between the ENBs 120 to 128 and the UE 101 in the LTE system &Quot; HARQ ") will be performed.

Since the HARQ alone can not satisfy various Quality of Service (QoS) requirements, an outer ARQ in an upper layer is allocated between the terminal 101 and the ENBs 120 to 128 .

The HARQ is a technique of enhancing the reception success rate by soft combining with the retransmitted data without discarding the previously received data. This is used to increase transmission efficiency in high-speed packet communication such as HSDPA or EDCH.

In addition, in order to realize a transmission rate of up to 100 Mbps, the LTE system is expected to use Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology in a 20 MHz bandwidth.

In the standard working group for the 3GPP LTE system, a tendency to apply a home cell or a private network is emerging as a method for providing services different from the conventional UMTS system. Here, the home cell or the private network refers to a cell and a network that provide services only for a specific terminal (s).

However, there are no concrete plans for applying the home cell or the private network.

Therefore, in a mobile communication system in which a home cell or a private network and a macro cell (hereinafter referred to as a " public cell ") are mixed, a method of selecting a cell according to the mobility of terminals is also known as a method used in the existing 3GPP UMTS system There is a problem that must be used.

This is because, as already mentioned, the cell selection method in the conventional 3GPP UMTS system is not applied to the concept of the home cell or the private network. Also, in a communication environment in which the home cell or the private network cell and the public cell are mixed, all the terminals recognize a cell corresponding to the home cell or the private network as an air cell and perform cell selection according to a conventional monitoring scheme do.

Accordingly, there is a need for more specific cell selection schemes according to the presence of a home cell or a private network in a newly proposed LTE system.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems occurring in the prior art, and it is an object of the present invention to provide a mobile communication system in which, in a mobile communication system in which specific cells accessible to only a specific terminal or a specific terminal group are mixed, And a method and apparatus for selecting a cell by confirming whether or not the cell is accessible.

The present invention also relates to a method for selecting a cell in a home cell or a private network by distinguishing a home cell or a private network cell and a public cell in a mobile communication system in which a specific cell corresponding to a home cell or a private network and a public cell are mixed And an apparatus.

A method according to an embodiment of the present invention is a method for a mobile station to select a cell in a mobile communication system, the method comprising: receiving information on a neighbor cell list and information on a closed subscriber group (CSG) cell from a serving cell; Performing a process on at least one neighboring cell based on information on the neighboring cell list; Determining a candidate cell based on the proximity; Receiving CSG information and a CSG ID from the candidate cell; Selecting the candidate cell when the CSG information indicates that the terminal is connectable to the CSG cell and the CSG ID is included in the CSG list set in the terminal.

An apparatus according to an embodiment of the present invention is an apparatus for selecting a cell in a mobile communication system, the apparatus comprising: a receiving unit for receiving information on a neighbor cell list and information on a CSG (Closed Subscriber Group) cell from a serving cell, A receiving unit receiving the CSG information and the CSG ID from the candidate cell determined as? Performing a proximity operation on at least one neighboring cell based on the information on the neighbor cell list, determining a candidate cell based on the proximity, and transmitting the CSG information to a terminal connected to the CSG cell And selecting a candidate cell when the CSG ID is included in the CSG list set in the terminal.

A terminal compares a list including information about a home cell or a private network stored in the terminal with information for identifying a cell of an object cell received through the system information, The cell selection is performed by defining a possible specific cell as a candidate cell. Also, the terminal compares the list with a specific neighbor cell including a specific offset value of the neighbor cell list received through the system information received from the serving cell, and defines the cell as a candidate cell for cell selection.

Accordingly, it is advantageous to prioritize the correspondence to the candidate cell to provide reliability and efficiency of the match.

The terminal of the present invention has the advantage of simplifying the handling procedure by managing the neighboring cells that are less likely to operate as a home cell or a private network cell so as not to perform the interference. That is, the terminal performs the matching only for the more reliable candidate cell by deleting the least likely cells in the context of the UE, thereby maximizing the efficiency in the handling procedure.

In addition, it has an advantage of ensuring the reliability of the cell selection after the result of the matching by prioritizing the cell which is likely to be a home cell or a private network cell.

1 is an embodiment of a 3GPP LTE system structure to which the present invention is applied.
2 is a diagram illustrating a cell selection method considering a home cell or a private network proposed in the first embodiment of the present invention.
3 is a flowchart illustrating an operation of a terminal according to a first embodiment of the present invention.
4 is an operational flowchart of a network (E-NB) according to the first embodiment of the present invention.
5 is a device block diagram of a terminal according to a first embodiment of the present invention;
6 is a device block diagram of a network (E-NB) according to the first embodiment of the present invention.
FIG. 7 illustrates a cell selection method considering a home cell or a private network according to a second embodiment of the present invention; FIG.
8A and 8B are operational flowcharts of a terminal according to a second embodiment of the present invention;
FIG. 9 is an operational flowchart of a network (E-NB) according to a second embodiment of the present invention;
10 is a device block diagram of a terminal according to a second embodiment of the present invention.
11 is a device block diagram of a network (E-NB) according to a second embodiment of the present invention.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

In describing the present invention, a 3GPP LTE (Long Term Evolution) system, which is a next generation mobile communication system evolved from a 3GPP (Universal Mobile Telecommunication Service) system, will be described as an example. The present invention can be applied to other mobile communication systems performing cell reselection without performing any additional addition or subtraction.

The present invention proposes a mobile communication environment and system supporting a dedicated service for one terminal or a specific terminal group by introducing a home cell or a private network cell. Also, the present invention provides a method for selecting and reselecting a home cell or a private network cell in response to a service of a terminal in a mobile communication environment in which the home cell or a private network cell and a public cell are mixed.

For convenience of explanation, cell selection and cell reselection are denoted by 'cell selection', which is a term including the cell reselection.

Cells in any area to which only a terminal or a specific terminal group such as a home cell, a private network cell, or a company network cell can be connected is defined as a CSG (Closed Subscriber Group) cell. Cell, a home cell, or a private network cell.

≪ Embodiment 1 >

In the first embodiment of the present invention, the mobile communication system broadcasts an identifier indicating whether a target cell is a specific cell accessible only by at least one specific terminal, that is, a cell corresponding to a home cell or a private network, And signaling to the terminal through the system information. And if the identifier indicates a specific cell. The terminal compares the information about the cell of the target cell with the list including the information about the home cell or the private network cell accessible only by at least one specific terminal stored in advance by the terminal. If the target cell is included in the list, the terminal determines the target cell as a cell capable of cell selection and cell reselection. On the other hand, if the target cell is not included in the list, the terminal determines the target cell as a cell which can not be selected and reselected.

For example, the determination of whether the target cell is included in the list may be performed by a public land mobile network (PLMN) selected by the terminal, a PLMN And checking whether the cell ID (ID) broadcast from the target cell is included in the list including the information on the accessible home cell or the private network cell. If the cell ID is defined in the system such that it can have a unique value regardless of the PLMN, a PLMN identity check may not be necessary.

2 is a diagram illustrating a cell selection scheme considering a home cell or a private network proposed in the first embodiment of the present invention.

Referring to FIG. 2, reference numeral 201 denotes a terminal and reference numeral 202 denotes a candidate cell (e.g., a target cell) for cell selection according to the result of the processing of the 201 terminal.

In step 211, the terminal 201 detects that the measurement is triggered. In this case, the mobile station measures a first common pilot channel (P-CPICH) from the current cell or neighbor cells, and determines a radio channel for the current cell or neighbor cells (Radio channel condition).

The triggering of the related step 211 may be performed when the terminal is powered on or when the terminal needs to know the radio channel environment for the neighboring cells to perform cell selection while moving, And is triggered when it is necessary to periodically know about the radio channel environment.

In step 221, the terminal selects a candidate cell for cell reselection according to the matching result. In FIG. 2, one of the candidate cells is a target cell 202.

If the target cell 202 is selected as a candidate cell for cell selection, the terminal 201 receives the system information broadcasted from the target cell 202 in step 231.

Here, the system information includes an identifier indicating whether the target cell 202 is a cell corresponding to a home cell or a private network. If the identifier indicates a cell corresponding to a home cell or a private network, the MS 201 performs the procedures of steps 241, 243, and 245. On the other hand, if the identifier does not mean the cell in which the target cell 202 corresponds to the home cell or the private network, the terminal 201 performs the procedure of step 251. [

First, in step 241, the terminal 201 searches the target cell 202 in a list including information on the accessible home cell or the private network. Here, the terminal may be storing the list including information on a home cell or a private network accessible to a memory, such as a Universal Subscriber Identity Module (USIM).

The accessible list may be pre-stored in the memory according to a hard coding scheme or signaled from a network entity during a Tracking Area Update (TAU) procedure.

In step 241, the terminal determines whether the target cell 202 is included in the list including information on the home cell or the private network. That is, the terminal checks whether the target cell 202 is accessible using the list. At this time, if the target cell 202 is a cell existing in the list, the terminal 201 regards the target cell 202 as a cell selectable cell in step 243. At this time, if the cell selection is not restricted by the cell selection, the terminal 201 performs cell selection with the target cell 202.

On the other hand, if the target cell 202 is not included in the accessible list in step 241, the terminal 201 determines in step 245 whether the target cell 202 is a non-eligible cell for cell selection I think. Therefore, another candidate cell is selected for cell selection.

Here, it is possible to check whether the target cell 202 is included in the list including information on the home cell or the private network through the system information broadcasted from the target cell 202. That is, the terminal 201 checks whether the cell ID of the target cell 202 transmitted in the system information is included in the list stored in the terminal.

Or, if the cell ID has a unique value only in the PLMN, the terminal will have to check if the 'cell ID + PLMN ID' is included in the list. Here, it does not exclude that a separate ID such as a personal network ID as well as a cell ID can be used.

In step 251, the MS 201 determines that the target cell 202 is a public cell, not a cell for a home cell or a private network, and determines whether cell re-selection is possible according to the conventional method.

3 is a flowchart illustrating an operation of the terminal according to the first embodiment of the present invention.

Referring to FIG. 3, in step 301, the terminal selects a candidate cell for cell selection as a result of performing a process for selecting a cell according to power-on or terminal movement. Then, system information is received from the candidate cell. Here, the candidate cell may be a target cell that can be moved later due to cell selection by the terminal.

In step 303, the terminal obtains an identifier indicating whether the candidate cell corresponds to a home cell or a private network, that is, only a specific cell that can be accessed only for the terminal or only specific terminal groups, using the system information transmitted from the candidate cell do.

Herein, since the terminal or the specific terminal group in the specific cell does not need to share the radio link with the unspecified other terminals in the public cell, it has an advantage that the service quality can be maximally ensured.

If it is determined in step 305 that the identifier is a home cell or a private network cell, step 311 is performed.

In step 311, the terminal compares the cell ID of the candidate cell selected in step 301 with a list including information on the stored accessable home cell or private network cell. The list accessible by the terminal may be stored in a memory such as a 3GPP USIM in a hard-coding manner, or may be signaled from an upper network in a TAU procedure and stored.

The comparison of the cell ID with the accessible list means to check whether the cell ID is included in the list. At this time, if the cell ID is defined to have a unique value only in the PLMN, the cell ID and the PLMN ID can be checked together.

If the cell ID of the selected candidate cell in step 301 is included in the cell list of step 311 in step 313, the terminal proceeds to step 321 and considers the selected candidate cell in step 301 as a cell selectable cell. If cell selection is not restricted by other information, cell selection is performed with the candidate cell.

In step 313, if the cell ID of the candidate cell is not included in the list, the terminal proceeds to step 323 and regards the candidate cell as a cell that can not be selected.

If the identifier does not indicate a home cell or a private network cell in step 305, the candidate cell is regarded as a public cell, and it is determined whether the cell is selected according to an existing method.

4 is a flowchart of the operation of the network (E-NB) according to the first embodiment of the present invention.

Referring to FIG. 4, in step 401, the E-NB sets system information to be broadcast to a cell. In step 403, the E-NB checks whether the selected cell is a cell corresponding to a home cell or a private network. The check may be signaled through Operations & Maintenance (O & M) or via an upper specific Network Entity. Therefore, the ENB can confirm that the cell is a set home cell or a private network cell.

If it is determined in step 405 that the cell to which the system information is to be transmitted is a specific cell corresponding to a home cell or a private network, the E-NB proceeds to step 411, where the E-NB transmits an identifier value to be transmitted to the system information, Is set to a value indicating that the specific cell is connectable.

If it is determined in step 405 that the cell does not correspond to a specific cell, the process proceeds to step 413 where the identifier to be transmitted in the system information is set to a value corresponding to a public cell indicating that the cell is not a specific cell.

In step 421, the E-NB transmits the identifier information set in step 411 or step 413. It is included in the system information block (SIB) and broadcasted in the cell.

5 is a block diagram of a mobile terminal according to a first embodiment of the present invention.

Referring to FIG. 5, the transmitter / receiver 501 receives a pilot signal for a response or receives system information from a candidate cell for cell selection after a matching result.

The measuring unit 511 measures a pilot signal received from the serving cell and neighboring cells of the terminal through the transceiving unit 501 and determines a candidate cell for cell selection according to the matching result.

When a candidate cell is selected through the ranging unit 511, the cell identifier analyzing unit 521 checks the system information of the candidate cell received through the transceiving unit 501, Lt; / RTI >

The cell extracting unit 513 extracts identifier information for distinguishing the cell from the system information or identifier information for estimating mobility of the terminal, and stores the extracted identifier information. For example, the identifier information may be a cell ID, a PLMN ID or a cell ID, as well as a separate ID such as a personal network ID.

The identifier analyzing unit 521 analyzes the cell identifier extracted from the cell extracting unit 513 by using the ID corresponding to the information that can be identified through the cell extracting unit 513, And confirms whether the cell is a corresponding cell.

The accessibility determining unit 523 determines whether or not the cell ID extracted from the cell extracting unit 513 corresponds to a home cell or a private network accessible only to a specific terminal or a specific terminal group stored in the list storing unit 525 Is included in the list including the information on the cells that are not included in the list.

The list storage unit 525 stores the list in advance in a Universal Subscriber Identity Module (USIM) of the terminal according to the hard-coding scheme. Or a topology list signaled from a particular network in the tracking area update process. At this time, the result of the accessibility determination unit 523 operates as an input signal in determining the cell selection of the cell selection determination unit 531. [

If the cell analyzer 521 determines that the cell is not a cell corresponding to a home cell or a private network, the identifier analyzer 521 determines whether the cell is finally accessible by using the cell extractor 513 and the list storage 525 It is not necessary to check whether or not the cell is accessible via the unit 523. Accordingly, the UE can determine whether to select a cell according to an existing method through the cell selection unit 531. [ That is, the cell is regarded as a public cell, and the cell selection is performed considering the result of the access to neighbor cells including the cell.

6 is a block diagram of a device of a network (E-NB) according to the first embodiment of the present invention

Referring to FIG. 6, the identifier setting unit 601 sets an identifier indicating whether the cell of the E-NB corresponds to a home cell or a private network. At this time, whether or not the cell corresponds to a home cell or a private network can be determined by O & M or by signaling to a higher specific network entity.

Accordingly, when the cell is set as a home cell or a private network cell, the identifier setting unit 601 sets an identifier indicating the home cell or the private network cell in the system information and transmits the identifier. On the other hand, if the cell does not correspond to a home cell or a private network cell, the identifier value to be transmitted is set to a value indicating that the cell is not a home cell or a private network cell.

The transceiver 611 broadcasts the identifier information set by the home cell identifier setting unit 601 to all the terminals in the cell by including the system information.

≪ Embodiment 2 >

In the second embodiment of the present invention, if a specific neighbor cell in the neighboring cell list broadcasted in the current cell in the mobile communication system is a cell for a home cell or a private network, To perform cell selection. At this time, the present invention optionally provides an Offset value for assigning a priority to the neighboring cell. Accordingly, if the offset value is included in the specific neighbor cell information of the neighbor cell list, the terminal regards the neighbor cell as not a cell for the home cell or the private network, and performs the interference according to the conventional method.

On the other hand, if the offset value is included in the specific neighbor cell information of the neighbor cell list, the terminal regards the neighbor cell as a cell for a home cell or a private network, And compares it with a list containing information about the network. On the other hand, if the neighboring cell is not included in the list, the cell is regarded as a cell which is not a cell selection target and does not perform the interference. Also, in the present invention, instead of considering the adjacent cell as a cell that is not a cell selection target, the offset value is neglected and the offset value is negatively applied to the adjacent cell result value May also be included.

In addition, if the neighboring cell is included in the list, the terminal regards the neighboring cell as a cell corresponding to a home cell or a private network to which the terminal can access, adds the offset value of the neighboring cell information, , And applies the result of the matching to the neighboring cell to increase the priority of cell selection for the neighboring cell. At this time, the offset value may be represented by an infinite value.

For example, the PLMN (Public Land Mobile Network) selected by the UE is identical to the PLMN broadcasted by the cell, and the UE determines whether the neighbor cell is included in the list Cell ID of the cell to be broadcasted. If the cell ID is defined in the system so that it can have a unique value regardless of PLMN, a PLMN identity check may not be necessary.

7 is a diagram illustrating a cell selection method considering a home cell or a private network according to a second embodiment of the present invention. The FIG. 7 can be more suitably used for the cell reselection scenario according to the mobility of the terminal.

Referring to FIG. 7, reference numeral 701 denotes a terminal and reference numeral 702 denotes a current cell (i.e., serving cell) in which the terminal is located.

In step 711, the serving cell 702 transmits a list of neighbor cells of the terminal 701 through the system information. That is, the terminal 701 receives a list of adjacent cells for the presence, which is one of the system information broadcasted from the current cell.

The neighbor cell list includes target cells to which the terminal 701 should perform monitoring when the mobile terminal 701 needs to perform a handover, and cell selection-related parameters of the cells.

In FIG. 7, the neighbor cell list includes values capable of estimating information on a plurality of cells adjacent to the serving cell. For example, information such as frequency information or a cell identifier (ID) of each cell. That is, the neighbor cell list is composed of cell selection related parameters, and in particular, in the case of a neighbor cell corresponding to a home cell or a private network, a specific offset value is included according to the present invention. As an example, an offset value of 3db may be included.

Wherein the offset value is a value indicating whether or not a terminal capable of accessing a specific cell corresponding to the home cell or the private network is capable of accessing the specific neighbor cell corresponding to the home cell or the private network when the terminal selects a candidate cell for selecting a resultant cell. In order to give higher priority to the user. In other words. A plurality of specific terminals accessible to the particular cell are enabled to operate with a plus offset value to the corresponding result value when the neighboring cells are tampered with.

For example, the neighbor cell list in step 711 includes the neighbor cell # 1, the neighbor cell # 2, the neighbor cell # 3, the neighbor cell # 4, the neighbor cell # 5, the neighbor cell # Lt; / RTI > At this time, if the neighbor cell # 6 is a specific cell corresponding to the home cell or the private network, the system information transmitted in step 711 may be set as follows.

[Neighbor cell list]

Neighbor cell # 1 information:

Neighbor cell # 2 information:

Neighbor cell # 3 information:

Neighbor cell # 4 information:

Neighbor cell # 5 information:

Neighbor cell # 6 information: Includes specific offset value information for setting priority

Neighbor cell # 7 information:

Neighbor cell # 8 information:

In step 721, the terminal 701 extracts at least one neighboring cell including the offset value. Assuming the above example, the neighbor cell # 6 corresponds to this, and the terminal 701 extracts the neighbor cell # 6.

In step 723, the terminal 701 checks whether the extracted neighboring cell (neighboring cell # 6) is included in the accessible 'list including information on the home cell or the private network cell'.

The accessible list may be hard-coded in the same memory as the 3GPP USIM, stored in the terminal 701, or signaled from the upper network according to the TAU procedure and stored in the terminal 701. If the cell ID has a unique value only in the PLMN, the cell ID-PLMN ID pair (Pair) can be compared with the list when performing step 723.

In step 723, the terminal 701 identifies cells that are not included in the list among the cells of step 721 through the accessible list, and deletes the cells from the access targets. That is, in steps 725 and 727 to be performed later, the cells deleted from the to-be-monitored object are regarded as cells that can not be selected when the cell is selected. This is because the cells that are not in the list are deleted in advance from the object of monitoring so as to perform the interference with the neighboring cells more efficiently.

Herein, the process of deleting from the object of interest is performed when the mobile terminal 701 moves, that is, when the mobile terminal needs to secure mobility, among the neighbor cells in the signaled neighbor cell list of step 711, That is, among the neighbor cells including the specific offset value information for prioritizing the home cell or the private network cell, it is not necessary to perform the interference on the cells that are not included in the accessible list stored in the terminal .

Accordingly, it is desired to increase the efficiency according to the handling of the terminal by deleting, in advance, the cells in the neighboring cell list but not present in the list in step 723. That is, the priority of the cell selection is lowered for the cells that are in the neighbor cell list but not in the list of the home cell or the private network in step 723. This is because, if the neighboring cells are not included in the list regarding the home cell or the private network, the terminal can not access it regardless of the result of the matching.

As an example, if the neighbor cell # 6 is not included in the accessible list stored by the terminal, adjacent cell # 6 need not be tampered when the terminal performs the tampering.

In step 731, the terminal 701 senses that the neighboring cells are triggered according to the movement. For example, if the radio intensity of the current cell is lower than a certain threshold value, a match for the neighboring cells may be triggered.

In step 741, the terminal 701 performs a process for the neighboring cells in the neighboring cell list. At this time, the terminal 701 performs neighboring cells including a specific offset value to prioritize the home cell or the private network cell among the neighboring cells. At this time, the terminal 701 may not perform a process for cells not included in the stored accessible list.

If the adjacent cell that performed the interference in step 741 is a neighbor cell including specific offset value information for prioritizing the home cell or the private network cell extracted in step 721 and the terminal stores the check result in step 723 In step 743, the terminal 701 adds the specific offset value corresponding to the cell to the matching result.

This is to increase the probability of selecting a home cell or a private network accessible by the terminal 701 as a candidate cell for performing cell selection. That is, when the cell is selected, the terminal places a priority on the candidate cell added with the offset value. The specific offset value may have an infinite value or a wrong value for each home cell or a private network cell.

If the offset value has an infinite value, the cell performs all the other neighboring cells and does not need to compare all of the neighboring cells, It is possible to select a candidate cell for selection.

In step 751, the terminal 701 selects a candidate cell to perform cell selection according to the result of the proximity of the neighboring cells. In step 753, the terminal 701 receives the cell selection related system information from the candidate cell in step 751, analyzes the cell selection related system information, and finally determines whether to select the cell.

8A and 8B are operational flowcharts of a terminal according to a second embodiment of the present invention.

Here, steps 801 to 833 of FIG. 8A are flowcharts showing an operation in which the UE receives a list of neighboring cells for interference through system information from a serving cell, and steps 841 to 857 of FIG. FIG. 8 is a flowchart illustrating an operation for performing a basis based on a neighbor cell list. FIG.

Referring to FIG. 8A, in step 801, a terminal receives a list of neighbor cells for a to-be-broadcast broadcasted in a current cell.

In step 811, the terminal extracts neighboring cells including specific offset value information from neighboring cells of the neighboring cell list received in step 801. The specific offset value information is a value for indicating a home cell or a private network according to the present invention, that is, a value accessible for only a specific terminal or group of terminals, to give priority to a cell when selecting the offset value.

In step 813, the MS determines whether the cells extracted in step 811 are included in a list including information on an accessable home cell or a private network cell stored in the MS. The accessible list may be hardcoded and stored in memory, such as a 3GPP USIM, or may be signaled from the network and stored in a procedure such as a TAU.

If the cell ID is a unique value regardless of the PLMN, it is checked whether the cell ID of the cell is included in the accessible list. If the cell ID has a unique value only in the PLMN, It is possible to check whether the ID is included in the list.

If the extracted neighboring cell is not included in the accessible list in step 821, the process proceeds to step 833. In step 833, the terminal regards the neighboring cell as a cell that can not be selected, and deletes the neighboring cell from the interference target of the terminal. This is so as not to perform the interference with respect to the cell in the future when the interference is triggered. That is, the efficiency of the operation of the terminal due to the interference is guaranteed.

On the other hand, if it is determined in step 821 that the neighboring cell is included in the accessible list, the process proceeds to step 831 where the cell identification of the neighboring cell or the cell ID of the neighboring cell and a specific offset value corresponding to the neighboring cell .

8B is a process of monitoring a terminal according to the present invention. In step 841, the terminal detects that a neighboring cell is triggered due to mobility or other reasons.

In step 851, the neighboring cells to be subjected to interference are subjected to interference. At this time, if, for example, cells included in the access list that include specific offset value information for prioritizing cell selection among neighboring cells but are stored in the terminal are not deleted from the access target by the step 833 It may not perform the abovementioned operations on neighboring cells.

On the other hand, if a cell corresponding to a home cell or a private network among neighbor cells includes specific offset value information for prioritization, if the cell is a cell included in an accessible list stored in the terminal, The neighboring cells stored in advance in step 831 are subjected to the matching.

In step 853, the terminal adds the specific offset value to the result of performing the motion on the cell. That is, the terminal capable of accessing a cell corresponding to a home cell or a private network is given priority in selecting a candidate cell for cell selection. In general, the neighboring cell having the largest offset value may be set as the candidate cell, unless the neighboring cell has a specific offset, as long as it is not limited by other conditions.

In step 855, the terminal selects a candidate cell to perform cell selection from neighboring cells according to the matching result.

In step 857, the terminal receives system information related to cell selection from the selected candidate cell, and determines whether to select a cell in the cell.

9 is a flowchart of the operation of the network (E-NB) according to the second embodiment of the present invention.

Referring to FIG. 9, in step 901, the E-NB sets neighbor cell list information. The neighbor cell list information may be broadcast in the system information broadcasted in the cell of the E-NB.

In step 903, the E-NB checks whether the specific neighbor cell in the neighbor cell list corresponds to a home cell or a private network. The check may be performed by the O & M or by signaling from an upper network entity.

If it is determined in step 905 that the specific neighbor cell is a specific cell supporting the home cell or the private network, the E-NB determines, in step 911, You can explicitly / implicitly include certain offset values that you can see.

On the other hand, if it is determined in step 905 that the particular neighbor cell is not a cell supporting the home cell or the private network, the neighbor cell information is not included in the neighbor cell information in step 913.

In step 921, when the offset value setting process for all the adjacent cells to be set up is completed, the E-NB includes the set neighboring cell list in the system information and broadcasts it into the cell.

10 is a block diagram of a terminal according to a second embodiment of the present invention.

Referring to FIG. 10, the transmitter / receiver 1001 receives a pilot signal for a response, receives neighbor cell list information for neighboring cells from the current cell through system information, Lt; / RTI >

The neighboring cell list receiving unit 1011 checks the neighboring cell list for interference using the system information transmitted from the current cell through the transmitting and receiving unit 1001. [

The specific cell extracting unit 1031 extracts adjacent cells including a specific offset value from the neighbor cell list received by the neighboring cell list receiving unit 1011. [ This is because the terminal, which is accessible to the specific cell corresponding to the home cell or the private network through the neighbor cell list, assigns a priority over the specific offset value and selects a cell having the priority.

The accessibility determining unit 1033 determines whether or not the specific cell extracted through the offset containing neighbor cell extracting unit 1031 is stored in the list storing unit 1035, It is determined whether or not the cell is accessible. Again, the accessibility determination unit 1033 determines whether the extracted specific cell is a cell included in the list.

If the cell ID of the extracted cell is not included in the list, the proximity cell context management unit 1021 deletes the adjacent cell from the object of interest.

Meanwhile, if the cell ID of the extracted cell is included in the list, the handling unit 1041 performs a process for the adjacent cell, and adds a specific offset value to the cell in the matching result. This is to give the cell a priority in selecting a home cell or a private network cell.

Therefore, the specific cell determining unit 1050 selects the cell for cell selection according to the result of the involvement of the handling unit 1041, and transmits the selected cell from the candidate cell via the transceiving unit 1001 Analyzes the cell selection related system information, and selects the cell as a home cell or a private network cell unless it is specifically restricted.

11 is a device block diagram of a network (E-NB) according to the second embodiment of the present invention.

11, a home cell check unit 1101 checks whether a specific neighbor cell of a neighbor cell list included in system information transmitted from a serving cell corresponds to a home cell or a private network accessible only by a specific terminal or a specific terminal group It is checked whether or not it is a specific cell.

The offset value setting unit 1103 confirms that the neighboring cell is a specific cell through the home cell check unit 1101 and increases the probability that the terminal capable of accessing the cell can select the cell when the cell is selected Set a specific offset value.

It is checked whether the specific cell check unit 1101 can operate as the home cell or the private network cell for all the neighbor cells included in the neighbor cell list, The neighbor cell list setting unit 1105 completes the neighbor cell list setting.

The transmission / reception unit 1111 broadcasts the neighbor cell list generated in the cell including the specific terminal or specific terminal groups. The neighbor cell list is broadcast to all terminals in the cell through system information.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

Claims (32)

A method for selecting a cell in a mobile communication system,
Receiving information on a neighbor cell list and information on a closed subscriber group (CSG) cell from a serving cell;
Performing a process on at least one neighboring cell based on information on the neighboring cell list;
Determining a candidate cell based on the proximity;
Receiving CSG information and a CSG ID from the candidate cell; And
And selecting the candidate cell if the CSG information indicates that the terminal is connectable to the CSG cell and the CSG ID is included in the CSG list set in the terminal. 2. The method of claim 1, wherein the information on the neighbor cell list includes at least one offset value corresponding to at least one neighbor cell,
Wherein the offset value is used to determine a measure. The method of claim 1, further comprising the step of receiving Public Land Mobile Network (PLMN) information from the candidate cell. The method of claim 1, further comprising: selecting the candidate cell if the candidate cell belongs to a registered or selected PLMN. The method according to claim 1,
Wherein the CSG list is stored in advance in the universal subscriber identity module of the terminal. The method according to claim 1,
Wherein when the CSG ID is included in a CSG list set in the terminal, the CSG information indicates that the terminal is connectable. The method according to claim 1,
Wherein the CSG list is signaled from the predetermined upper network to the terminal. The method according to claim 1,
Wherein the CSG ID and the CSG information are received through the system information from the candidate cell. The method according to claim 1,
If the CSG ID is not included in the CSG list, identifying the candidate cell as a candidate cell that is not cell selectable. 3. The method of claim 2, further comprising: extracting a neighboring cell from the information of the neighboring cell list based on the at least one offset value. 11. The method of claim 10, wherein when the extracted neighboring cell is not included in the CSG list, the priority level of the extracted neighboring cell is reduced. 11. The method of claim 10, further comprising determining whether a CSG ID of the extracted neighbor cell is included in a CSG list. An apparatus for selecting a cell in a mobile communication system,
A receiver for receiving information on a neighbor cell list and information on a closed subscriber group (CSG) cell from a serving cell, and receiving CSG information and a CSG ID from candidate cells determined based on the presence side; And
Performing a proximity operation on at least one neighboring cell based on the information on the neighbor cell list, determining a candidate cell based on the proximity, and transmitting the CSG information to a terminal connected to the CSG cell And a controller for selecting the candidate cell when the CSG ID is included in the CSG list set in the terminal. 14. The method of claim 13, wherein the information on the neighbor cell list includes at least one offset value corresponding to at least one neighbor cell,
Wherein the offset value is used to determine a match. 14. The cell selection device of claim 13, wherein the always-receiving unit receives PLMN (Public Land Mobile Network) information from the candidate cell. 14. The cell selection device of claim 13, wherein the controller selects the candidate cell when the candidate cell belongs to the registered or selected PLMN. 14. The method of claim 13,
Wherein the CSG list is stored in advance in the universal subscriber identity module of the terminal. 14. The method of claim 13,
Wherein when the CSG ID is included in a CSG list set in the terminal, the CSG information indicates that the terminal is connectable. 14. The method of claim 13,
Wherein the CSG list is signaled from the predetermined upper network to the terminal. 14. The method of claim 13,
Wherein the CSG ID and the CSG information are received through the system information from the candidate cell. 14. The method of claim 13,
Wherein if the CSG ID is not included in the CSG list, the controller identifies the candidate cell as a candidate cell that is not cell selectable. 15. The method of claim 14,
Further comprising: a controller for extracting a neighboring cell from information on the neighboring cell list based on the at least one offset value. 23. The cell selection device of claim 22, wherein the control unit controls the priority level of the extracted neighboring cell to be reduced when the extracted neighboring cell is not included in the CSG list. 23. The cell selection device of claim 22, wherein the controller determines whether the CSG ID of the extracted neighbor cell is included in the CSG list. A method for serving a closed subscriber group (CSG) cell in a mobile communication system,
Setting information on a neighbor cell list, information on a closed subscriber group (CSG) cell, CSG information, and a CSG ID in the system information; And
And broadcasting the information on the set neighbor cell list, information on a closed subscriber group (CSG) cell, CSG information, and CSG ID to at least one terminal in the cell in the system information A method of servicing a CSG cell. 26. The method of claim 25,
Wherein the information on the neighbor cell list includes at least one offset value corresponding to at least one neighbor cell,
Wherein the offset value is used to determine a measure. 26. The method of claim 25,
Wherein when the CSG ID is included in a CSG list set in the terminal, the CSG information indicates that the terminal is connectable. 26. The method of claim 25, wherein the CSG list is signaled from a predetermined higher network to the terminal. An apparatus for serving a CSG (Closed Subscriber Group) cell in a mobile communication system,
A setting unit for setting information on a neighbor cell list, information on a closed subscriber group (CSG) cell, CSG information, and a CSG ID in the system information; And
And transmitting and receiving information on the set adjacent cell list, information on a closed subscriber group (CSG) cell, CSG information, and CSG ID to at least one terminal in the cell in the system information Device serving CSG cell. 30. The method of claim 29,
Wherein the information on the neighbor cell list includes at least one offset value corresponding to at least one neighbor cell,
Wherein the offset value is used to determine a measure. 30. The method of claim 29,
Wherein when the CSG ID is included in a CSG list set in the terminal, the CSG information indicates that the terminal is connectable. 30. The apparatus of claim 29, wherein the CSG list is signaled from a predetermined higher network to the terminal.

Images