WO2012173347A2 - Procédé de régulation d'accès à une petite cellule et station de base de petite cellule - Google Patents

Procédé de régulation d'accès à une petite cellule et station de base de petite cellule Download PDF

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Publication number
WO2012173347A2
WO2012173347A2 PCT/KR2012/004323 KR2012004323W WO2012173347A2 WO 2012173347 A2 WO2012173347 A2 WO 2012173347A2 KR 2012004323 W KR2012004323 W KR 2012004323W WO 2012173347 A2 WO2012173347 A2 WO 2012173347A2
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Prior art keywords
terminal
small cell
access control
terminals
base station
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PCT/KR2012/004323
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English (en)
Korean (ko)
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WO2012173347A3 (fr
Inventor
곽도영
이종식
김현표
허시영
김정휘
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주식회사 케이티
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Publication of WO2012173347A2 publication Critical patent/WO2012173347A2/fr
Publication of WO2012173347A3 publication Critical patent/WO2012173347A3/fr

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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

Definitions

  • the present invention relates to access control in small cells such as femtocells.
  • the present invention provides a method and a small cell base station for providing efficient access control in a small cell that can mitigate interference between the small cell and the macro cell and improve small cell performance.
  • the present invention provides efficient access in a small cell that can mitigate interference between the small cell and the macro cell and improve small cell performance when a new call connection request is received while the capacity of the small cell such as a femtocell is already saturated.
  • the present invention provides a small cell access control method provided by a small cell base station, the method comprising: receiving a call connection request from a first terminal in small cell coverage of the small cell base station whose capacity is saturated; And a plurality of second terminals operating within the small cell coverage and among the first terminal and the plurality of second terminals based on signal quality information of each of the first terminal transmitting the call connection request. Selecting a terminal; And controlling the access control target terminal to induce or move an access to a macro cell base station or another small cell base station.
  • the present invention in the small cell base station for small cell access control, when a call connection request is received from the first terminal within the small cell coverage of the small cell base station, the small cell base station is operating within the small cell coverage
  • An access control determining unit determining whether the number of existing access terminals is equal to the capacity of the small cell base station; If the number of existing access terminals is equal to the capacity, the first terminal is based on signal quality information of each of a plurality of second terminals operating within the small cell coverage and each of the first terminals transmitting the call connection request.
  • An access control target terminal selecting unit configured to select an access control target terminal from a terminal and the plurality of second terminals; And an access control unit configured to control the access control target terminal to induce or move a connection to a macro cell base station or another small cell base station.
  • the present invention provides a small cell access control method provided by a small cell base station, the method comprising: obtaining reference information including signal quality information of each of terminals within a small cell coverage of the small cell base station; Selecting an access control target terminal from terminals within the small cell coverage based on the obtained reference information; And controlling the access control target terminal to induce or move an access to a macro cell base station or another small cell base station.
  • the obtaining of the reference information may further obtain information on at least one of whether an emergency call is related, whether a Closed Subscriber Group (CSG) terminal is connected, and an access mode type.
  • CSG Closed Subscriber Group
  • the access priority of each terminal within the small cell coverage is determined based on the obtained reference information, and the access control target terminal is determined according to the determined access priority. Can be selected.
  • the present invention can provide efficient access control in a small cell that can mitigate interference between the small cell and the macro cell and improve small cell performance.
  • the present invention provides efficient access in a small cell that can mitigate interference between the small cell and the macro cell and improve small cell performance when a new call connection request is received while the capacity of the 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 built together.
  • FIG. 2 is a flowchart illustrating a small cell access control method according to an embodiment.
  • FIG. 3 is an exemplary flowchart of an access control target terminal selection step.
  • FIG. 4 is another exemplary flowchart of an access control target terminal selection step.
  • FIG. 5 is another exemplary flowchart of an access control target terminal selection step.
  • FIG. 6 is another exemplary flowchart of an access control target terminal selection step.
  • FIG. 7 is a block diagram of a small cell base station for small cell access control according to another embodiment.
  • FIG. 8 is a flowchart illustrating a small cell access control method according to another embodiment.
  • 1 is a network architecture for applying small cell access control according to an embodiment.
  • a network architecture for applying small cell access control is a heterogeneous network architecture in which a macrocell and a small cell are constructed together.
  • the "small cell” may include a femtocell, a picocell, a microcell, and the like, and a cell, which is a unit of service area that one base station is responsible for in mobile communication, It may have a meaning as one kind of Cell) or may include a meaning of the base station itself.
  • small cells and macrocells including a femtocell, a picocell, a microcell, and the like are described as a service area unit, and a femtocell base station, a picocell base station, a microcell base station, and the like are described.
  • the small cell base station 110, the macro cell base station 11, etc. to be included are described separately as the meaning of the base station in charge of the service in each service coverage.
  • the coverage 100 of the small cell base station 110 is present in the coverage 10 of the macro cell base station 11, and the small cell base station 110 is installed in an indoor or outdoor shadow area to improve the quality of service or service coverage.
  • a small base station used for improving or offloading data in congested areas or areas where macrocell capacity saturation occurs.
  • the femtocell base station among the small cell base station 110 is a Home NodeB (HNB) in a 3rd Generation Partnership Project (3GPP) Universal Mobile Telecommunications System (UMTS) or a Home eNodeB (HeNB) in a 3GPP Long Term Evolution (LTE). It may include.
  • HNB Home NodeB
  • 3GPP 3rd Generation Partnership Project
  • UMTS Universal Mobile Telecommunications System
  • HeNB Home eNodeB
  • LTE Long Term Evolution
  • the small cell base station 110 such as a femtocell base station, is a closed access mode (CSG terminal), a CSG terminal, and a non-closed subscriber group that allows access only to a closed subscriber group (CSG) terminal.
  • CSG terminal closed access mode
  • CSG terminal closed subscriber group
  • Non-CSG Non-Closed Subscriber Group
  • a hybrid access mode that allows all access to the terminal Hybrid Access Mode
  • Open Access Mode Open Access Mode
  • mobility between the small cell and the macrocell or mobility between the small cells may be provided.
  • FIGS. 2 to 6 a method of providing small cell access control in a heterogeneous network architecture in which a macrocell and a small cell illustrated in FIG. 1 are constructed together will be described with reference to FIGS. 2 to 6.
  • FIG. 2 is a flowchart illustrating a small cell access control method according to an embodiment.
  • the small cell access control method provided by the small cell base station 110 includes a first method within the small cell coverage 100 of the small cell base station 110 whose capacity is saturated.
  • An access control target terminal is selected from the first terminal 111 and the plurality of second terminals 112 based on the signal quality information of each of the second terminal 112 and the first terminal 111 that has transmitted the call connection request.
  • Step S204 and controlling the access control target terminal to induce or move the access to the macro cell base station 11 or another small cell base station (not shown) (S206) and the like.
  • the small cell access control method provided by the small cell base station 110 includes a small cell with a saturated capacity before the 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, and receives signal quality from each of the first terminal 111 and the plurality of second terminals 112.
  • the method may further include obtaining 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 (S202).
  • the signal quality information acquired in the above-described signal quality information acquisition step S202 may be, for example, a signal to interference and noise ratio (CINR), a received signal strength indication (RSSI), or an Ec. / Io and Reference Signal Received Power (RSRP) may include one or more, and may also be any information that can determine the communication state between each terminal 111, 112 and the small cell base station 110. .
  • CINR signal to interference and noise ratio
  • RSSI received signal strength indication
  • RSRP Reference Signal Received Power
  • 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 is a Radio Resource Control (RRC) connection request.
  • RRC Radio Resource Control
  • REQUEST the signal quality information response message received from the first terminal 111 that has made a new call connection request may be a response message corresponding to the RRC CONNECTION REQUEST message.
  • the signal quality information request message transmitted from the small cell base station 110 to the plurality of second terminals 112 that were already operating at the time of the new call connection request is a measurement report message
  • the plurality of second The signal quality information response message received from the terminal 112 may be a response message corresponding to a measurement report message.
  • the RRC CONNECTION REQUEST message and the MEASUREMENT REPORT message may be messages defined in 3GPP Universal Mobile Telecommunications System (UMTS) or 3GPP Long Term Evolution (LTE).
  • the signal quality information request message may use a radio resource control connection request (RRC CONNECTION REQUEST) message defined as follows in 3GPP UMTS (WCDMA).
  • RRC CONNECTION REQUEST radio resource control connection request
  • the signal quality information request message for the currently connected second terminal 112 may use a measurement report message defined as follows in 3GPP UMTS (WCDMA) according to an event trigger.
  • the MEASUREMENT REPORT message may be included as an optional field in a RRC CONNECTION REQUEST message.
  • measuredResultsOnRACH may be defined as follows.
  • the signal quality information request message of the first terminal 111 requesting a new call connection may be used as a radio resource control connection request message as shown below. have.
  • the signal quality information request message to the currently connected second terminal 112 may be used as the following MEASUREMENT REPORT message defined in 3GPP LTE according to an event trigger.
  • Measurement Results Information Element (measResults IE) is defined in 3GPP as follows.
  • the small cell base station 110 has a capacity that has meaning such as the number of terminals that can be connected or the number of terminals that can be serviced. Therefore, the small cell base station 110 can provide a service only when a terminal having a capacity less than or equal to is connected.
  • the fact that the small cell base station 110 is saturated in capacity means that the same number of terminals as the predetermined capacity are connected and operated. 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 with saturated storage capacity is accommodated by the small cell base station 110 with saturated storage capacity. It may be equal to or greater than the dose.
  • the small cell base station 110 having the saturated capacity already receives a new call connection request from the first terminal 111, the first call transmission request is transmitted in the state where the capacity is saturated.
  • the terminal 111 refused the call connection without any consideration and induced the connection to the macro cell base station 11 or another small cell base station adjacent thereto.
  • Such a conventional access control method can be performed without conditions without comprehensively considering the state or situation of each of the first terminal 111 that has newly requested a call connection request and the plurality of second terminals 112 that are already connected and operating. Since the call connection is rejected with respect to the first terminal 111 that has newly requested a call connection in a state where the capacity is saturated, the problem of increasing the interference between the small cell and the macro cell, such as a femtocell, and reducing the small cell performance. This can be.
  • the present invention establishes a call connection to the first terminal 1110 that transmits the new call connection request.
  • a new call connection request is newly considered in consideration of the state or situation of each of the first terminal 111 that has newly requested a call connection request and the plurality of second terminals 112 already connected and operating.
  • Access control target terminal which is controlled to induce or move a connection to a macro cell base station 11 or another small cell base station among a plurality of second terminals 112 that are already connected to and operate with the first terminal 111 which has already been connected. Select.
  • the access control target terminal selection step (S204) the signal quality information of each of the first terminal 111 that has newly made a call connection request and the plurality of second terminals 112 already connected and operating.
  • the access control target terminal is selected based on
  • the first terminal 111 and the plurality of agents may be determined according to the high and low signal quality information, and the access control target terminal may be selected according to the determined access priority.
  • the access control target terminal selection step (S204) in addition to the signal quality information of each of the first terminal 111 and the plurality of second terminals 112, the first terminal 111 and the plurality of second terminals 112, respectively.
  • One or more of whether or not the emergency call is related to each of the first terminal 111 and the plurality of second terminals 112, the CSG terminal, and the connection mode type of the small cell base station 110 whose capacity is saturated.
  • the access control target terminal can be selected from the first terminal 111 and the plurality of second terminals 112.
  • the access control target terminal selection step (S204) will be described in more detail with reference to FIGS. 3 to 6, which show some examples of the access control target terminal selection scheme, respectively.
  • FIG 3 is an exemplary flowchart of an access control target terminal selection step (S204).
  • the access control target terminal selection step (S204) may be performed by selecting an emergency call () among a plurality of second terminals 112 previously connected and operating with a first terminal 111 that has newly requested a call connection request. Determining whether there is an emergency terminal associated with an Emergence Call (S300), and if the emergency terminal is present as a result of the grasping at step S300, the emergency terminal is selected from the first terminal 111 and the plurality of second terminals 112.
  • An access control target terminal selection step (S204) illustrated in FIG. 3 by way of example is a step for selecting an access control target terminal regardless of the access mode type of the small cell base station 110 whose capacity is saturated.
  • step S204 of selecting the access control target terminal illustrated in FIG. 4 when the access mode type of the small cell base station 110 whose capacity is saturated is the limited access mode, selecting the access control target terminal It's a step for you.
  • the access control target terminal selection step (S204) may include determining whether the first terminal 111 newly requesting a call connection is an emergency terminal associated with an emergency call (S400), and at step S400. As a result of the determination, if the first terminal 111 is an emergency terminal, selecting the terminal with the lowest signal quality information among the plurality of second terminals 112 previously connected and operating as the access control target terminal (S402). ) And determining whether the first terminal 111 is the CSG terminal (S404), and determining the first terminal 111 if the first terminal 111 is not an emergency terminal (S404).
  • the terminal 111 is a CSG terminal, 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 (S406) and in the S404 step. As a result of the determination, if the first terminal 111 is not the CSG terminal, the first terminal 111 is connected to the access control target terminal. And selecting the words (S407).
  • FIG 5 is another exemplary flowchart of the access control target terminal selection step (S204).
  • step S204 of selecting the access control target terminal illustrated in FIG. 5 when the access mode type of the small cell base station 110 whose capacity is saturated is the hybrid access mode, selecting the access control target terminal It's a step for you.
  • the access control target terminal selection step (S204) may include determining whether the first terminal 111 newly requesting a call connection is an emergency terminal associated with an emergency call (S500), and step S500. As a result of the determination, if the first terminal 111 is an emergency terminal, it is determined whether a non-CSG terminal exists among the plurality of second terminals 112 previously connected and operated (S502) and the determination result of step S502.
  • step S504 the terminal having the lowest signal quality information among the non-CSG terminals is selected as the access control target terminal (S504) and the determination result of step S502, If the non-CSG terminal does not exist among the second terminals, selecting the terminal with the lowest signal quality information among the plurality of second terminals 112 as the access control target terminal (S506) and the grasping result of step S500 If the terminal 111 is not an emergency terminal, the first stage If it is determined in step S508 that the 111 is the CSG terminal, and the determination result of step S508 is the first terminal 111 is the CSG terminal, it is determined whether a non-CSG terminal exists among the plurality of second terminals 112.
  • step S510 selecting the terminal having the lowest signal quality information among the non-CSG terminals as the access control target terminal ( If the non-CSG terminal does not exist among the plurality of second terminals 112 as a result of the determination in step S512 and S510, the terminal having the lowest signal quality information among the first terminal 111 and the plurality of second terminals 112.
  • step S516 the terminal with the lowest received signal quality is selected as the access control target terminal.
  • FIG. 6 is another exemplary flowchart of the access control target terminal selection step (S204).
  • step S204 of selecting an access control target terminal illustrated in FIG. 6 when the access mode type of the small cell base station 110 whose capacity is saturated is an open access mode, the access control target terminal is selected. It's a step for you.
  • the access control target terminal selection step (S204) includes determining whether the first terminal 111 that has newly requested a call connection is an emergency terminal associated with an emergency call (S600), and a first terminal. If the terminal 111 is an emergency terminal, selecting the terminal having the lowest signal quality information among the plurality of second terminals 112 previously connected and operating as the access control target terminal (S602) and the first terminal ( If the terminal 111 is not an emergency terminal, selecting the 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) or the like.
  • Access control to the access control target terminal is performed.
  • the small cell base station 110 is the selected access control target terminal to the macrocell base station 11 or another small cell base station (not shown) Control to induce or move connections.
  • the connection induction or movement of the access control target terminal to the macrocell base station 11 or another small cell base station (not shown) is relocated to the serving radio network subsystem that is also used in the existing system.
  • SRNS Serving Radio Network Subsystem
  • a handover procedure such as a hard handover, or a redirection procedure.
  • the small cell base station 110, the macrocell base station 11 having the best signal quality based on the neighboring macrocell information measured at the time of initial setting or sniff mode operation May be controlled to induce or redirect the access control target terminal.
  • the access control target terminal can be induced.
  • the small cell base station 110 is initially set or sniffed without going through the target macrocell base station selection procedure of the access control target terminal
  • the macrocell having the best signal quality may be designated as the target macrocell based on the neighboring macrocell information measured during the (Sniff) mode operation to induce a mobile procedure for the access control target terminal.
  • FIG. 7 is a block diagram of a small cell base station 110 for small cell access control according to another embodiment.
  • the small cell base station 110 for small cell access control requests a call connection from the first terminal 111 within the small cell coverage 100 of the small cell base station 110. Is received, it is determined whether the access control to determine whether the number of existing access terminals (that is, the number of the second terminal 112) operating within the small cell coverage 100 is greater than the capacity of the small cell base station 110; When the number of the existing access terminals is greater than or equal to the capacity 710, each of the plurality of second terminals 112 operating in the small cell coverage 100 and each of the first terminals 111 that transmits the call connection request are provided.
  • the access control target terminal selecting 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, and the access control target terminal are the macro cell base station 11. ) Or directs the connection to another small cell base station It includes an access control unit 730 and so on for controlling so.
  • the small cell base station 110 for small cell access control accesses the small cell base station 110 at the time of receiving a call connection request from the first terminal 111. If the number of the existing access terminals, which is the number of the second terminals 112 that are operating, is greater than or equal to the capacity of the small cell base station 110, request for the signal quality information to each of the first terminal 111 and the plurality of second terminals 112. By transmitting a message and receiving a signal quality information response message including signal quality information from each of the first terminal 111 and the plurality of second terminals 112, thereby receiving each of the first terminal and the plurality of second terminals.
  • the apparatus may further include a signal quality information acquisition unit 740 for acquiring the signal quality information.
  • the above-described access control target terminal selection unit 720 is based on the signal quality information of each of the first terminal 111 and the plurality of second terminals 112, the first terminal 111 and the plurality of second terminals 112.
  • the access priority can be determined for each of them, and the access control target terminal can be selected according to the determined access priority.
  • the above-described access control target terminal selecting unit 720 includes whether the emergency call is associated with each of the first terminal 111 and the plurality of second terminals 112, the first terminal 111, and the plurality of second terminals 112. ) Access control targets based on one or more of the CSG terminal status 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 based on the access control target terminal selection method illustrated in FIGS. 3 to 6.
  • the small cell base station 110 described above may be, for example, one of a femtocell base station, a picocell base station, a microcell base station, and the like. If the small cell base station 110 is a femtocell base station, the small cell base station 110 is a Home NodeB (HNB) in a 3GPP UMTS (Universal Mobile Telecommunications System) or a Home eNodeB (HeNB) in a 3GPP Long Term Evolution (LTE). ) May be included.
  • HNB Home NodeB
  • 3GPP UMTS Universal Mobile Telecommunications System
  • HeNB Home eNodeB
  • LTE Long Term Evolution
  • FIG. 8 is a flowchart illustrating a small cell access control method according to another embodiment.
  • signal quality information of each of the terminals in the small cell coverage 100 of the small cell base station 110 may be determined.
  • Acquiring reference information including S800; selecting an access control target terminal from among terminals in the small cell coverage 100 based on the obtained reference information (S802); It may include the step (S804) and the like to control the connection or move to the macro cell base station 10 or another small cell base station.
  • the small cell base station 110 may further acquire information on one or more of whether or not the emergency call is related, whether or not the CSG terminal is connected, the type of connection mode, and the amount of data transmission, in addition to the signal quality information. Can be.
  • step S802 the small cell base station 110 determines the access priority of each of the terminals in the small cell coverage 100 based on the obtained reference information, and determines the access priority. In accordance with this, the access control target terminal can be selected.
  • the small cell base station 110 when a new call connection request is received in the state that the capacity of the small cell base station 110 is saturated, the terminal making a new call connection request Selecting an access control target terminal from (the first terminal 111) and a terminal (second terminal 112) already connected and operating to induce or move the access to the macro cell base station 10 or another small cell base station. You can control it,
  • the small cell base station 110 may provide service performance (eg, data) within the small cell coverage even when the capacity of the small cell base station 110 is not saturated.
  • the access control target terminal may be selected among the terminals that are already connected, and the control may be performed to induce or move the access to the macro cell base station 10 or another small cell base station. have.
  • the present invention in the small cell that can reduce the interference between the small cell and the macro cell and improve the small cell performance when a new call connection request is received while the capacity of the small cell such as femtocell is already saturated. Efficient access control can be provided.

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Abstract

La présente invention concerne un procédé pour une station de base de petite cellule pour réguler l'accès à une petite cellule. Le procédé comprend les étapes consistant à : recevoir une requête d'accès d'appel provenant d'un premier terminal à l'intérieur d'une zone de couverture de petite cellule de la station de base de petite cellule ayant une capacité saturée ; sélectionner un terminal cible de régulation d'accès parmi le premier terminal et plusieurs seconds terminaux sur la base d'informations de qualité de signal sur chacun des différents seconds terminaux fonctionnant à l'intérieur de la zone de couverture de petite cellule et du premier terminal qui transmet la requête d'accès d'appel ; et commander le terminal cible de régulation d'accès de façon à induire un accès à, ou un déplacement vers, une station de base macrocellulaire ou une station de base de petite cellule différente.
PCT/KR2012/004323 2011-06-14 2012-05-31 Procédé de régulation d'accès à une petite cellule et station de base de petite cellule WO2012173347A2 (fr)

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KR1020110057341A KR101602975B1 (ko) 2011-06-14 2011-06-14 스몰셀 액세스 제어를 위한 방법 및 스몰셀 기지국
KR10-2011-0057341 2011-06-14

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CN105307243A (zh) * 2014-07-22 2016-02-03 中兴通讯股份有限公司 无线接入网及其服务小小区的选择方法和装置

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KR102160418B1 (ko) 2019-06-03 2020-09-29 박순구 5세대 이동통신 기반에서의 스몰 셀 기지국 장치를 이용한 영상관리 서비스 시스템
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