KR101602975B1 - Method and small cell base station for small cell access control - Google Patents

Method and small cell base station for small cell access control Download PDF

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KR101602975B1
KR101602975B1 KR1020110057341A KR20110057341A KR101602975B1 KR 101602975 B1 KR101602975 B1 KR 101602975B1 KR 1020110057341 A KR1020110057341 A KR 1020110057341A KR 20110057341 A KR20110057341 A KR 20110057341A KR 101602975 B1 KR101602975 B1 KR 101602975B1
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terminal
terminals
small cell
access control
base station
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KR20120138063A (en
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곽도영
이종식
김현표
허시영
김정휘
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주식회사 케이티
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Priority to PCT/KR2012/004323 priority patent/WO2012173347A2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

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  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
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Abstract

The present invention provides a small cell access control method provided by a small cell base station, comprising the steps of: receiving a call connection request from a first terminal within a small cell coverage of the small cell base station, the capacity of which is saturated; And a signal quality information extracting unit that extracts, from among the first terminal and the plurality of second terminals, access control target information of the first terminal and the plurality of second terminals based on the signal quality information of each of the plurality of second terminals operating in the small cell coverage and the first terminal transmitting the call connection request Selecting a terminal; And controlling the access control target terminal to conduct connection or movement to a macro cell base station or another small cell base station.

Description

[0001] METHOD AND SMALL CELL BASE STATION FOR SMALL CELL ACCESS CONTROL [0002]

The present invention relates to access control in a small cell such as a femtocell.

Conventionally, when a new call connection request is received while the capacity of a small cell base station such as a femtocell base station, a pico cell base station, or a microcell base station is already saturated, a call connection request And the connection to the macro cell base station or the adjacent small cell base station is induced. This increases the interference between a small cell such as a femtocell and a macrocell, and degrades the performance of a small cell.

The present invention provides a method and a small cell base station for providing efficient access control in a small cell capable of mitigating interference between a small cell and a macro cell and improving the small cell performance.

The present invention relates to an efficient access in a small cell that can reduce interference between a small cell and a macro cell and improve a small cell performance when a new call connection request is received in a state where a capacity of a small cell such as a femtocell is already saturated, A method of providing control and a small cell base station.

In one aspect, the present invention provides a small cell access control method provided by a small cell base station, comprising the steps of: receiving a call connection request from a first terminal within a small cell coverage of the small cell base station, the capacity of which is saturated; And a signal quality information extracting unit that extracts, from among the first terminal and the plurality of second terminals, access control target information of the first terminal and the plurality of second terminals based on the signal quality information of each of the plurality of second terminals operating in the small cell coverage and the first terminal transmitting the call connection request Selecting a terminal; And controlling the access control target terminal to conduct connection or movement to a macro cell base station or another small cell base station.

In another aspect, the present invention provides, in a small cell base station for small cell access control, when a call connection request is received from a first terminal within a small cell coverage of the small cell base station, An access control unit for determining whether the number of existing access terminals is equal to or larger than a capacity of the small cell base station; Cell coverage and the signal quality information of each of the plurality of second terminals operating in the small cell coverage and the first terminal transmitting the call connection request when the number of existing access terminals is equal to or larger than the accommodation capacity, And an access control target terminal selecting unit that selects an access control target terminal from among the plurality of second terminals; And an access control section for controlling the access control target terminal to guide or move the connection to the macro cell base station or another small cell cell.

In another aspect, the present invention provides a small cell access control method provided by a small cell base station, comprising: obtaining reference information including signal quality information of each of the terminals within a small cell coverage of a small cell base station; Selecting an access control target terminal among the terminals within the small cell coverage based on the obtained reference information; And controlling the access control target terminal to conduct connection or movement to a macro cell base station or another small cell base station.

INDUSTRIAL APPLICABILITY The present invention can provide efficient access control in a small cell that can reduce interference between a small cell and a macro cell and improve the small cell performance.

The present invention relates to an efficient access in a small cell that can reduce interference between a small cell and a macro cell and improve a small cell performance when a new call connection request is received in a state where a capacity of a small cell such as a femtocell is already saturated, Control can be provided.

1 is a heterogeneous network architecture in which a macro cell and a small cell are constructed together.
2 is a flowchart of a method for controlling access to a small cell according to an embodiment.
3 is an exemplary flowchart of the access control target terminal selecting step.
4 is another exemplary flowchart of the access control target terminal selecting step.
5 is another exemplary flowchart of the access control target terminal selecting step.
6 is another exemplary flowchart of the access control target terminal selecting step.
7 is a block diagram of a small cell base station for small cell access control according to another embodiment.
8 is a flowchart of a small cell access control method according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different 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.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a network architecture for applying the small cell access control according to the embodiment.

As shown in FIG. 1, the network architecture for applying the small cell access control according to the embodiment is a heterogeneous network architecture in which a macro cell and a small cell are constructed together.

Here, "small cell" may include a femtocell, a picocell, a microcell, and the like. In a mobile communication, a cell, which is a service zone unit Cell) or may include the meaning of the base station itself.

For the sake of convenience of explanation, in the present specification, a small cell including a femtocell, a picocell, a microcell, etc. and a macro cell are described as a unit of a service zone, and a femtocell base station, a picocell base station, The small cell base station 110 and the macro cell base station 11, which include the mobile station 100, divide the service coverage into the meaning of the base station in charge of the service.

Typically, the coverage 100 of the small cell base station 110 is within the coverage 10 of the macro cell base station 11 and the small cell base station 110 is installed in the indoor or outdoor shadow area to provide service quality or service coverage And is used for data offloading purposes in areas where congestion areas or macrocell capacity saturation occur.

In particular, the femtocell base station 110 of the small cell base station 110 may use a Home Node B (HNB) in a 3GPP (Universal Mobile Telecommunications System) or a Home eNodeB (HeNB) in a 3GPP LTE (Long Term Evolution) . ≪ / RTI >

The small cell base station 110 such as a femtocell base station may be a closed access mode in which a connection is allowed only to a closed subscriber group (CSG) terminal, a CSG terminal and a non- (Hybrid Access Mode) that allows all non-CSG (Non-CSG) terminals to access the non-CSG terminal and an Open Access Mode It can operate in three connection modes.

1, mobility between small cells and macro cells or mobility between small cells can be provided in a heterogeneous network architecture in which a macro cell and a small cell are constructed together.

Hereinafter, a method of providing a small cell access control in a heterogeneous network architecture in which a macro cell and a small cell exemplarily shown in FIG. 1 are constructed together will be described with reference to FIG. 2 to FIG.

2 is a flowchart of a method for controlling access to a small cell according to an embodiment.

2, a small-cell access control method provided by a small-cell base station 110 according to an embodiment is a method for controlling a small-cell access control method in a small-cell coverage 100 of a small- A step S200 of receiving a call connection request from the terminal 111 and a step S200 of receiving a call connection request from the first terminal 111 and a plurality of active The access control target terminal is selected from among the first terminal 111 and the plurality of second terminals 112 based on the signal quality information of the second terminal 112 and the first terminal 111 that has transmitted the call connection request Step S204 and step S206 of controlling the access control target terminal to connect or move to the macro cell base station 11 or another adjacent small cell base station (not shown), and the like.

2, the small-cell access control method provided by the small-cell base station 110 according to the embodiment is characterized in that, before the above-described access control target terminal selection step S204, The base station 110 transmits a signal quality information request message to each of the first terminal 111 and the plurality of second terminals 112 to determine a signal quality from the first terminal 111 and the plurality of second terminals 112, (S202) of the signal quality information of each of the first terminal 111 and the plurality of second terminals 112 by receiving the signal quality information response message including the information.

The signal quality information obtained in the signal quality information acquiring step S202 includes, for example, a signal-to-interference plus noise ratio (CINR), a received signal strength (RSSI), a received signal strength / Io and a reference signal received power (RSRP), or may be any information capable of grasping the communication state between each of the terminals 111 and 112 and the small cell base station 110 .

In order to acquire such signal quality information, the signal quality information request message transmitted from the small cell base station 110 to the first terminal 111 that has made a new call connection request includes a radio resource control connection request (RRC (Radio Resource Control) CONNECTION REQUEST message, and the signal quality information response message for receiving a new call connection request from the first UE 111 may be a response message corresponding to a radio resource control connection request (RRC CONNECTION REQUEST) message.

In addition, the signal quality information request message transmitted to the plurality of second terminals 112 already operating at the time of a new call connection request in the small cell base station 110 is a measurement report message, The signal quality information response message received from the terminal 112 may be a response message corresponding to the MEASUREMENT REPORT message. Here, the RRC CONNECTION REQUEST message and the MEASUREMENT REPORT message may be messages defined in 3GPP Universal Mobile Telecommunications System (UMTS) or 3GPP LTE (Long Term Evolution).

For example, the signal quality information request message may use a Radio Resource Control Request (RRC CONNECTION REQUEST) message defined in 3GPP UMTS (WCDMA) as follows.

Figure 112011044706209-pat00001

The signal quality information request message for the currently connected second terminal 112 may use a MEASUREMENT REPORT message defined in the 3GPP UMTS (WCDMA) according to an event trigger. This MEASUREMENT REPORT message may be included as an Optional Field in a Radio Resource Control Request (RRC CONNECTION REQUEST) message.

Figure 112011044706209-pat00002

Here, measuredResultsOnRACH can be defined as follows.

Figure 112011044706209-pat00003

Also, in a manner similar to 3GPP UMTS (WCDMA), in the 3GPP LTE, the signal quality information request message of the first MS 111 requesting a new call connection can be used as a RRC CONNECTION REQUEST message have.

Figure 112011044706209-pat00004

That is, in the RRC CONNECTION REQUEST message, the RRC CONNECTION REQUEST message is modified to include the measResults IE in the criticalExtensionsFuture sequence that is not currently defined, and the RRC CONNECTION REQUEST message is used to request the signal quality information request .

The signal quality information request message to the currently connected second terminal 112 may be used as a MEASUREMENT REPORT message defined in 3GPP LTE according to an event trigger.

Figure 112011044706209-pat00005

Finally, the Measurement Results Information Element (measResults IE) is defined in 3GPP as follows.

Figure 112011044706209-pat00006

On the other hand, the small cell base station 110 determines the capacity of the small cell base station 110, such as the number of available terminals or the number of available terminals. Therefore, the small cell base station 110 can provide a service only when a terminal having a capacity equal to or less than the capacity of the terminal is connected.

In this sense, the fact that the small cell base station 110 is saturated with the capacity means that the same number of terminals as the predetermined capacity are connected and operating. That is, the number of the plurality of second terminals 112 operating in the small cell coverage 100 of the small cell base station 110 in which the capacity is saturated is larger than the number of the second terminals 112 in the capacity Capacity. ≪ / RTI >

As described above, when the small cell base station 110, which has already been saturated with the capacity, receives a new call connection request from the first terminal 111, The call connection is rejected to the terminal 111 without any consideration and the connection is induced to the macro cell base station 11 or the adjacent small cell base station.

Such a conventional access control method is a method of access control in which a first terminal 111 that has made a new call connection request and a plurality of second terminals 112 that are already connected and operated are collectively considered without comprehensively Since the call connection is refused to the first terminal 111 that has made a new call connection request in a state in which the capacity is saturated, it is rather problematic to increase the interference between the small cell such as a femtocell and the macrocell, This can be.

In order to solve this problem, according to the present invention, when a new call connection request is received in a state in which the capacity of the small cell base station 110 is saturated, a call connection to the first terminal 1110, which has transmitted a new call connection request, The first terminal 111 that has made a new call connection request and the plurality of second terminals 112 that are already connected and operated in connection with the state or situation of the second terminal 112, Which is controlled to be guided or moved to the macro cell base station 11 or the adjacent small cell base station among the plurality of second terminals 112 already operating in connection with the first terminal 111 that has already been connected to the small cell base station 11, .

As described above, in the access control target terminal selecting step (S204), the signal quality information of each of the first terminal 111 that has made a new call connection request and the plurality of second terminals 112 that are already connected and operated already, , The access control target terminal is selected.

At this time, based on the signal quality information of each of the first terminal 111 that has made a new call connection request and the plurality of second terminals 112 that are already connected and operated, 2 terminals 112 according to the high and low levels of the signal quality information, and to select the access control target terminal according to the determined connection priority order.

In the access control target terminal selecting step S204, the first terminal 111 and the plurality of second terminals 112, in addition to the signal quality information of the first terminal 111 and the plurality of second terminals 112, And the connection mode type of the small cell base station 110 in which the capacity is saturated and the CSG terminal for each of the first terminal 111 and the plurality of second terminals 112, It is possible to select an access control target terminal from among the first terminal 111 and the plurality of second terminals 112 on the basis of the received information.

Hereinafter, the access control target terminal selecting step (S204) will be described in more detail with reference to Figs. 3 to 6 showing some examples of the access control target terminal selecting methods.

3 is an exemplary flowchart of an access control subject terminal selection step (S204).

3, the access control target terminal selection step S204 is a step of selecting an access control target terminal among the plurality of second terminals 112 that have already been connected and operated with the first terminal 111 that has made a new call connection request (Step S300). If it is determined in step S300 that there is an emergency terminal, it is determined whether there is an emergency terminal among the first terminal 111 and the plurality of second terminals 112 (S302) of selecting a terminal having the lowest signal quality information among the remaining terminals as an access control target terminal, and if the emergency terminal does not exist as a result of the determination in step S300, the first terminal 111 and the plurality of second Selecting a terminal having the lowest signal quality information among the terminals 112 as an access control target terminal (S304), and the like.

The access control target terminal selecting step S204 illustrated in FIG. 3 is a step for selecting an access control target terminal irrespective of the connection mode type of the small cell base station 110 in which the capacity is saturated.

Fig. 4 is another exemplary flowchart of the access control subject terminal selection step S204.

The access control target terminal selecting step (S204) illustrated in FIG. 4 selects the access control target terminal when the connection mode type of the small cell base station 110 in which the storage capacity is saturated is the limited access mode (Closed Access Mode) .

Referring to FIG. 4, the access control target terminal selection step (S204) includes a step S400 of determining whether the first terminal 111 that has made a new call connection request is an emergency terminal related to an emergency call (S400) If the first terminal 111 is an emergency terminal, selecting the terminal having the lowest signal quality information among the plurality of second terminals 112 already connected and operating as an access control target terminal (S402 (Step S404) of determining whether the first terminal 111 is a CSG terminal, if the first terminal 111 is not an emergency terminal, as a result of the detection in step S400, If the terminal 111 is the CSG terminal, step S406 of selecting the terminal having the lowest signal quality information among the first terminal 111 and the plurality of second terminals 112 as the access control target terminal, If it is determined that the first terminal 111 is not the CSG terminal, (S407), and the like.

5 is another exemplary flowchart of the access control subject terminal selection step S204.

The access control target terminal selecting step (S204) illustrated in FIG. 5 selects the access control target terminal when the connection mode type of the small cell base station 110 in which the storage capacity is saturated is the hybrid access mode .

Referring to FIG. 5, the access control target terminal selection step (S204) includes a step S500 of determining whether the first terminal 111 that has made a new call connection request is an emergency terminal related to an emergency call (S500) If it is determined that the first terminal 111 is an emergency terminal, step S502 of determining whether a non-CSG terminal exists among a plurality of second terminals 112 already connected and operating has been performed, If the non-CSG terminal exists among the plurality of second terminals 112, a step S504 of selecting the terminal having the lowest signal quality information among the Non-CSG terminals as an access control target terminal, (S506) of selecting, as an access control target terminal, a terminal having the lowest signal quality information among the plurality of second terminals 112 if the non-CSG terminal is not present in the second terminal, If the terminal 111 is not an emergency terminal, CSG terminal of the plurality of second terminals 112 is determined if the first terminal 111 is the CSG terminal and if the first terminal 111 is the CSG terminal in step S508 If it is determined in step S510 that the non-CSG terminal exists among the plurality of second terminals 112 as a result of the determination in step S510, the step of selecting a terminal having the lowest signal quality information among the non-CSG terminals as an access control target terminal CSG terminal among the plurality of second terminals 112 does not exist as a result of the determination in step S510 that the signal quality information of the first terminal 111 and the plurality of second terminals 112 is the lowest CSG terminal and the first terminal 111 of the plurality of second terminals 112 if the first terminal 111 is not a CSG terminal (step S514) (S516) a terminal having the lowest received signal quality as an access control target terminal.

6 is another example flowchart of the access control subject terminal selection step S204.

The access control target terminal selecting step S204 shown in Fig. 6 is a step of selecting an access control target terminal when the connection mode type of the small cell base station 110 in which the storage capacity is saturated is the open access mode .

Referring to FIG. 6, the access control target terminal selection step S204 includes a step S600 of determining whether the first terminal 111 that has made a new call connection request is an emergency terminal related to an emergency call, (S602) of selecting, as an access control target terminal, a terminal having the lowest signal quality information among a plurality of second terminals 112 already connected and operated when the terminal 111 is an emergency terminal, 111) is not an emergency terminal, a step S604 of selecting a terminal having the lowest signal quality information among the first terminal 111 and the plurality of second terminals 112 as an access control target terminal (S604).

After the access control target terminal is selected from among the plurality of second terminals 112 already connected and operating with the first terminal 111 that has made a new call connection request according to the above-described methods, Access control is performed on the access control target terminal.

As described above, in the access control step (S206) for the access control target terminal, the small cell base station 110 transmits the selected access control target terminal to the macro cell base station 11 or the adjacent small cell base station (not shown) Thereby controlling the connection or movement.

In this access control step S206, the connection induction or movement of the access control target terminal to the macro cell base station 11 or another adjacent small cell base station (not shown) (Serving Radio Network Subsystem) Relocation (SRNS) procedure, a handover procedure such as a hard handover, or a redirection procedure.

In this access control step S206, the small cell base station 110 transmits the macro cell base station 11 having the best signal quality based on the neighbor macro cell information measured in the initial setting or the sniff mode operation ) So that the access control target terminal can be guided or redirected.

That is, when the small cell base station 110 determines the macrocell frequency with the best signal quality based on the neighbor macro cell information measured in the initial setting or the sniff mode operation, To the access control target terminal.

In addition, when moving to the macro cell base station 11, the conventional SRNS relocation procedure may be followed. Alternatively, the small cell base station 110 may perform the initial setting or sniff operation without going through the target macrocell base station selection procedure of the access control target terminal A macrocell having the best signal quality may be designated as a target macrocell based on the measured neighboring macrocell information in the Sniff mode operation, thereby deriving a movement procedure for the access control target terminal.

Hereinafter, the small cell base station 110 for small cell access control will be described with reference to FIG.

7 is a block diagram of a small cell base station 110 for small cell access control according to another embodiment.

7, the small cell base station 110 for small cell access control according to another embodiment receives a call connection request from the first terminal 111 in the small cell coverage 100 of the small cell base station 110, It is determined whether or not an access control is performed to determine whether the number of existing access terminals (that is, the number of second terminals 112) operating in the small cell coverage 100 is equal to or larger than the capacity of the small cell base station 110 A plurality of second terminals 112 operating in the small cell coverage 100 and a plurality of first terminals 111 transmitting a call connection request are connected to the first terminal 111, An access control target terminal selection unit 720 for selecting an access control target terminal from among the first terminal 111 and the plurality of second terminals 112 based on the signal quality information, ) Or connection to another adjacent small cell base station or It includes an access control unit 730 and so on for controlling so.

As shown in FIG. 7, the small cell base station 110 for small cell access control according to another embodiment accesses the small cell base station 110 at the time of receiving a call connection request from the first terminal 111 When the number of existing access terminals, which is the number of the second terminals 112 in operation, is equal to or larger than the capacity of the small cell base station 110, a signal quality information request is sent to each of the first terminal 111 and the plurality of second terminals 112 By receiving a signal quality information response message including the signal quality information from each of the first terminal 111 and the plurality of second terminals 112 by transmitting the message quality information response message to the first terminal 111 and the plurality of second terminals 112, And a signal quality information acquisition unit 740 for acquiring signal quality information.

The access control target terminal selecting section 720 selects one of the first terminal 111 and the plurality of second terminals 112 based on the signal quality information of each of the first terminal 111 and the plurality of second terminals 112 ), And the access control target terminal can be selected according to the determined access priority order.

The access control target terminal selecting unit 720 may determine whether the emergency call is related to each of the first terminal 111 and the plurality of second terminals 112 and whether the first terminal 111 and the plurality of second terminals 112 Based on at least one of the CSG terminal existence and the connection mode type of the small cell base station 110 and the signal quality information of each of the first terminal 111 and the plurality of second terminals 112, The terminal may be selected, and a more specific selection method may be selected according to the access control target terminal selection method shown in FIG. 3 to FIG.

The small cell base station 110 may be, for example, one of a femtocell base station, a pico cell base station, and a microcell base station. If the small cell base station 110 is a femtocell base station, the small cell base station 110 transmits a Home Node B (HNB) in a 3GPP Universal Mobile Telecommunications System (UMTS) or a Home eNodeB (HeNB) in a 3GPP Long Term Evolution (LTE) ), And the like.

8 is a flowchart of a small cell access control method according to another embodiment.

Referring to FIG. 8, the small cell access control method of the small cell base station 110 according to still another embodiment of the present invention includes the signal quality information of each of the terminals in the small cell coverage 100 of the small cell base station 110 A step S802 of selecting an access control target terminal among the terminals in the small cell coverage 100 based on the obtained reference information, (S804) of controlling the connection to or from the macro cell base station 10 or another small cell base station.

In step S800 of acquiring the reference information, the small cell base station 110 obtains information on at least one of the emergency call related information, the CSG terminal status, the connection mode type, etc., in addition to the signal quality information .

In step S802 of selecting an access control target terminal, the small cell base station 110 determines the access priority order of each of the terminals in the small cell coverage 100 based on the obtained reference information, The access control target terminal can be selected.

According to the small cell access control method according to yet another embodiment, when the small cell base station 110 receives a new call connection request in a state in which the capacity of the small cell base station 110 is saturated, (The first terminal 111) and the terminal that is already connected and operating (the second terminal 112), and selects or moves the access control target terminal to the macro cell base station 10 or another small cell base station Control can be performed,

In addition, according to the small-cell access control method according to yet another embodiment, the small-cell base station 110 can perform the service performance in the small-cell coverage (for example, data The access control target terminal may be selected from the terminals already connected to the macro cell base station 10 or another small cell base station by considering the transmission speed, delay, traffic balance, etc. as a whole, have.

As described above, according to the present invention, it is possible to provide an efficient access control in a small cell that can reduce the interference between the small cell and the macro cell and improve the small cell performance.

It is another object of the present invention to provide a small cell which can reduce interference between a small cell and a macro cell when a new call connection request is received while a capacity of a small cell such as a femtocell is already saturated, It is possible to provide efficient access control.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A small cell access control method provided by a small cell base station,
Receiving a new call connection request from a first terminal within a small cell coverage of the small cell base station in which the capacity is saturated; And
Based on the signal quality information of each of the plurality of second terminals operating in the small cell coverage and the first terminal transmitting the call connection request, among the first terminal and the plurality of second terminals, ; And
Controlling the access control target terminal to connect or move to a macro cell base station or another small cell base station,
Wherein the selecting comprises:
The access control target terminal is further selected by considering the emergency call related to each of the first terminal and the plurality of second terminals and the connection mode type of the small cell base station in which the capacity is saturated,
When there is an emergency terminal related to an emergency call among the first terminal and the plurality of second terminals, the access control target terminal is selected excluding the emergency terminal,
Wherein the connection mode type of the small cell base station is set to one of a limited connection mode, a hybrid connection mode, and an open connection mode. The method according to claim 1,
Wherein the selecting comprises:
Determining a connection priority order for each of the first terminal and the plurality of second terminals based on the signal quality information of each of the first terminal and the plurality of second terminals, And the terminal is selected. delete The method according to claim 1,
Wherein the selecting comprises:
Determining whether the emergency terminal related to the emergency call is present among the first terminal and the plurality of second terminals;
Selecting the terminal having the lowest signal quality information among the terminals other than the emergency terminal among the first terminal and the plurality of second terminals as the access control target terminal if the emergency terminal exists; And
And selecting the terminal having the lowest signal quality information among the first terminal and the plurality of second terminals as the access control target terminal if the emergency terminal does not exist. The method according to claim 1,
Wherein the selecting comprises:
When the connection mode type of the small cell base station in which the capacity is saturated is the limited connection mode,
Determining whether the first terminal is the emergency terminal associated with the emergency call;
If the first terminal is the emergency terminal, selecting the terminal having the lowest signal quality information among the plurality of second terminals as the access control target terminal;
Determining whether the first terminal is a closed subscriber group terminal if the first terminal is not the emergency terminal;
If the first terminal is the closed subscriber group terminal, selecting the terminal having the lowest signal quality information among the first terminal and the plurality of second terminals as the access control target terminal; And
And selecting the first terminal as the access control target terminal if the first terminal is not the closed subscriber group terminal. The method according to claim 1,
Wherein the selecting comprises:
When the connection mode type of the small cell base station in which the capacity is saturated is the hybrid connection mode,
Determining whether the first terminal is the emergency terminal associated with the emergency call;
Determining whether a Non-Closed Subscriber Group (CSG) exists among the plurality of second terminals if the first terminal is the emergency terminal;
Selecting a terminal having the lowest signal quality information among the non-closed subscriber group terminals as the access control target terminal if the non-closed subscriber group terminal exists among the plurality of second terminals;
Selecting a terminal having the lowest signal quality information among the plurality of second terminals as the access control target terminal if the non-closed subscriber group terminal does not exist among the plurality of second terminals;
Determining whether the first terminal is a closed subscriber group terminal if the first terminal is not the emergency terminal;
Determining whether a non-closed subscriber group terminal exists among the plurality of second terminals if the first terminal is a closed subscriber group terminal;
Selecting a terminal having the lowest signal quality information among the non-closed subscriber group terminals as the access control target terminal if the non-closed subscriber group terminal exists among the plurality of second terminals;
Selecting a terminal having the lowest signal quality information among the first terminal and the plurality of second terminals as the access control target terminal if the non-closed subscriber group terminal of the plurality of second terminals does not exist; And
And selecting the terminal having the lowest received signal quality among the plurality of second terminal and the first terminal as the access control subject terminal if the first terminal is not the closed subscriber group terminal Wherein the small cell access control method comprises the steps of: The method according to claim 1,
Wherein the selecting comprises:
When the connection mode type of the small cell base station in which the capacity is saturated is the open connection mode,
Determining whether the first terminal is the emergency terminal associated with the emergency call;
If the first terminal is the emergency terminal, selecting the terminal having the lowest signal quality information among the plurality of second terminals as the access control target terminal; And
And selecting the terminal having the lowest signal quality information among the first terminal and the plurality of second terminals as the access control target terminal if the first terminal is not the emergency terminal Control method. The method according to claim 1,
Prior to the selecting step,
Receiving a signal quality information response message including signal quality information from each of the first terminal and the plurality of second terminals by transmitting a signal quality information request message to each of the first terminal and the plurality of second terminals, And acquiring signal quality information of each of the first terminal and the plurality of second terminals. 9. The method of claim 8,
The signal quality information request message transmitted to the first terminal is a radio resource control connection request (RRC)
Wherein the signal quality information request message transmitted to the plurality of second terminals is a MEASUREMENT REPORT message. The method according to claim 1,
Wherein the controlling comprises:
And controls the access control target terminal to be guided or redirected to the macro cell base station having the best signal quality based on the neighboring macro cell information measured in the initial setting or the sniff mode operation. Access control method. The method according to claim 1,
Wherein the number of the plurality of second terminals operating within the small cell coverage of the small cell base station in which the capacity is saturated is equal to or larger than a capacity of the small cell base station in which the capacity is saturated. Control method. The method according to claim 1,
Wherein the signal quality information comprises:
Wherein the mobile station includes at least one of a Carrier to Interference plus Noise Ratio (CINR), a Received Signal Strength Indication (RSSI), and a Reference Signal Received Power (RSRP) Access control method. In a small cell base station for small cell access control,
When receiving a call connection request from the first terminal within the small cell coverage of the small cell base station, determining whether the number of existing access terminals operating in the small cell coverage is equal to or larger than the capacity of the small cell base station A determination unit;
Cell coverage and the signal quality information of each of the plurality of second terminals operating in the small cell coverage and the first terminal transmitting the call connection request when the number of existing access terminals is equal to or larger than the accommodation capacity, And an access control target terminal selecting unit that selects an access control target terminal from among the plurality of second terminals; And
And an access control unit for controlling the access control target terminal to guide or move a connection to a macro cell base station or another small cell base station,
Wherein the access control target terminal selecting unit comprises:
The access control target terminal is further selected by considering the emergency call related to each of the first terminal and the plurality of second terminals and the connection mode type of the small cell base station in which the capacity is saturated,
When there is an emergency terminal related to an emergency call among the first terminal and the plurality of second terminals, the access control target terminal is selected excluding the emergency terminal,
Wherein the connection mode type of the small cell base station is set to one of a limited connection mode, a hybrid connection mode, and an open connection mode. 14. The method of claim 13,
And transmitting a signal quality information request message to each of the first terminal and the plurality of second terminals when the number of existing access terminals is equal to or greater than the reception capacity, Further comprising a signal quality information obtaining unit for obtaining signal quality information of each of the first terminal and the plurality of second terminals by receiving a signal quality information response message including the signal quality information response message. 14. The method of claim 13,
Wherein the access control target terminal selecting unit comprises:
Determining a connection priority order for each of the first terminal and the plurality of second terminals based on the signal quality information of each of the first terminal and the plurality of second terminals, Cell access control for small-cell access control. delete 14. The method of claim 13,
The small cell base station
A femtocell base station, a femtocell base station, a ficocell base station, and a microcell base station. delete delete delete
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