WO2011071332A2 - 중첩 네트워크 환경에서 핸드오버를 수행하기 위한 방법 및 장치와 시스템 - Google Patents

중첩 네트워크 환경에서 핸드오버를 수행하기 위한 방법 및 장치와 시스템 Download PDF

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WO2011071332A2
WO2011071332A2 PCT/KR2010/008836 KR2010008836W WO2011071332A2 WO 2011071332 A2 WO2011071332 A2 WO 2011071332A2 KR 2010008836 W KR2010008836 W KR 2010008836W WO 2011071332 A2 WO2011071332 A2 WO 2011071332A2
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Prior art keywords
cell
user terminal
femto
destination
identifier
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PCT/KR2010/008836
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English (en)
French (fr)
Korean (ko)
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WO2011071332A3 (ko
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리펑
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority to US13/514,676 priority Critical patent/US8938228B2/en
Priority to EP10836227.8A priority patent/EP2512182A4/de
Publication of WO2011071332A2 publication Critical patent/WO2011071332A2/ko
Publication of WO2011071332A3 publication Critical patent/WO2011071332A3/ko
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • a preferred embodiment relates to handover in a wireless communication system, and more particularly, to a method, apparatus and system for performing inbound handover from a macro cell to a femto cell.
  • a radio wave shadow area is formed in an enclosed building such as an office and a house, and the base station does not perform smooth communication with a terminal located in the radio wave shadow area.
  • the wireless communication system provides a femto-cell service for providing high-speed data services while solving service problems in the radio shadow area.
  • the femto cell means a relatively small cell area compared to a macro cell and is formed by a femto base station installed in a desired area of a user. That is, the femto cell is a micro mobile base station connected to a mobile communication core network through a broadband network installed indoors such as a home or an office.
  • a femto cell is a compound word of 'femto' which means 10 -15 (one thousandth of a trillion) and 'cell' which means the communication range of a mobile phone, and means a base station that can provide coverage with a cell radius of 10 meters or less. do.
  • the femto cell adopts the concept of a specific closed subscriber group (hereinafter referred to as 'CSG'). Accordingly, the femto cell can control only a specific group of subscribers to access.
  • the femto cell typically operates in CSG mode and provides service only to user terminals belonging to a specific subscriber group.
  • the femto cell operating in the CSG mode is referred to as a CSG cell in the following description.
  • a user terminal performs an access control to enter the CSG cell.
  • the user terminal should have a list of CSG cell identifiers, which are entitled to access the CSG cell, a so-called allowed CSG list of user terminals.
  • handover is one of the biggest features of a wireless communication system using a cellular network, it is required to ensure the mobility of the user terminal. Since a plurality of femto cells may be installed in one macro cell area, when a user terminal moves between the macro cell and the femto cell, handover is performed. Entry of the user terminal from the macro cell to the femto cell is referred to as inbound handover, and entry of the femto cell from the macro cell to the femto cell is called outbound handover.
  • the network checks whether the user terminal belongs to a specific subscriber group of the femto cell, that is, the CSG cell. Only when the user terminal belongs to a specific subscriber group of the CSG cell, the network may initiate a handover preparation procedure. That is, before performing the handover to the CSG cell, the network should perform access control for the user terminal.
  • a method, apparatus, and system for identifying a femto cell in which confusion occurs due to a duplicately assigned PCID and performing a handover are provided.
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • PCS physical layer cell identifier
  • a method for performing inbound handover by a macro base station supporting a communication service for the macro cell in an established mobile network when the PCID provided for inbound handover from the user terminal is the shared PCID, additional information is received from the user terminal. And receiving one of two or more femto cells provided with the shared PCID as a destination femto cell, and performing an inbound handover procedure for accessing the user terminal and the destination femto cell.
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • PCS physical layer cell identifier
  • the mobility management node performs the access control for performing the inbound handover, when receiving a handover request message from the macro base station supporting the communication service for the macro cell, the allowed CSG list of the user terminal And checking whether a CSG identifier of a destination femto cell is retained, and when not allowing an allowed CSG list of the user terminal, obtaining the allowed CSG list from a home subscriber server (HSS); If it does not hold the CSG identifier of the destination femto cell, destination femto Acquiring the CSG identifier from a base station; when acquiring the allowed CSG list and the CSG identifier, confirming whether the CSG identifier of the destination femto cell is included in the allowed CSG list of the user terminal; Correspondingly, sending a handover failure or command message to the macro base station.
  • HSS home subscriber server
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • PCS physical layer cell identifier
  • a system for performing inbound handover by a macro base station that supports a communication service for the macro cell in an established mobile network may provide additional information from the user terminal when the PCID provided for inbound handover from the user terminal is the shared PCID.
  • a macro base station configured to receive one of two or more femtocells provided with the shared PCID as a destination femto cell, and perform an inbound handover procedure for accessing the user terminal and the destination femto cell.
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • PCS physical layer cell identifier
  • the destination femto base station Acquiring the CSG identifier and acquiring the allowed CSG list and the CSG identifier, after checking whether the CSG identifier of the destination femto cell is included in the allowed CSG list of the user terminal, handover in response to the confirmation result
  • the mobility management node sends a failure or command message to the macro base station.
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • PCS physical layer cell identifier
  • a user terminal capable of inbound handover in an advanced mobile network receives a message including a measurement gap used to obtain system information of a destination femto cell from a macro base station, and uses the measurement gap to system of the destination femto cell. After acquiring the information, a measurement report message including preliminary access control information confirming whether access to the destination femto cell is allowed based on the obtained system information is transmitted to the macro base station.
  • the macro cell and a plurality of femto cells in the macro cell are configured, and the same shared physical layer cell identifier (PCS) is given to two or more femto cells of the plurality of femto cells.
  • a method for performing an inbound handover by a user terminal in an established mobile network may include receiving a message from a macro base station including a measurement gap used to obtain system information of a destination femto cell, and using the measurement gap. Transmitting a measurement report message including a process of acquiring system information of a destination femto cell and preliminary access control information confirming whether access to the destination femto cell is permitted based on the acquired system information to the macro base station; Process.
  • FIG. 1 is a block diagram of a mobile communication system to which an embodiment of the present invention is applied;
  • SAE system architecture evolution
  • FIG. 3 is a flowchart of a procedure for performing inbound handover according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method, apparatus and system for performing handover when a user terminal moves from a macro cell to a femto cell.
  • FIG. 1 illustrates a mobile communication system to which a preferred embodiment of the present invention is applied.
  • the mobile communication system includes macro cells 110 and 150 formed by macro base stations 130 and 160 and a plurality of femto cells 120 and 170 installed in the macro cells 110 and 150. Include.
  • the macro base station 130 and the macro cell 110 will be described with reference.
  • a plurality of femto cells 120 may be located or newly installed in an area of the macro cell 110 formed by the macro base station 130.
  • the macro base station 130 in order to support inbound handover to the plurality of femto cells 120, the macro base station 130 must register the femto cell 120 capable of inbound handover in a neighbor list. However, at this time, the registered femtocell 120 may not exceed a maximum of 32.
  • the macro base station 130 that manages the macro cell 110 assigns one physical layer cell identifier (PCID) to each femto base station located in its service area.
  • PCID physical layer cell identifier
  • the macro base station Duplicately assigns PCIDs to femto base stations. Therefore, a plurality of femto cells 120 existing in the macro cell 110 may be allocated the same PCID. Accordingly, the macro base station 130 should be able to determine the correct destination femto cell when the corresponding PCID included in the measurement report message received from the user terminal 140 is a PCID that is duplicated.
  • the user terminal needs to perform preliminary access control on the destination CSG cell in order to eliminate an attempt to handover to a CSG cell not included in its allowed CSG list. Therefore, only when the cell reported by the user terminal corresponds to the allowed CSG cell, the network may initiate a handover preparation procedure to the reported CSG cell. However, the network also needs to directly perform access control on the destination CSG cell of the user terminal.
  • FIG. 2 illustrates a System Architecture Evolution (SAE) architecture, which is an evolved packet system currently underway in 3GPP to implement a preferred embodiment.
  • SAE System Architecture Evolution
  • the SAE includes a UE (201), an E-UTRAN (Enhanced UTRAN) 203, a mobility management entity (hereinafter referred to as an MME) 211, a serving gateway (Serving). Gateway (hereinafter referred to as 'SGW') 205, Packet or Public Data Network Gateway (PDN) referred to as 'PGW' (207), Serving GPRS Support Node (SGSN) 209, Home subscriber server (HSS) 213 and the like.
  • 'SGW' Packet or Public Data Network Gateway
  • SGSN Serving GPRS Support Node
  • HSS Home subscriber server
  • the E-UTRAN 203 is an evolved access network, and an evolved base station (enhanced Node B: referred to as 'eNB') (not shown) is included as an E-UTRAN entity.
  • the eNB refers to a base station of a macro cell
  • a home enhanced node hereinafter, referred to as 'HeNB'
  • 'HeNB' home enhanced node
  • the MME 211 performs functions such as Non Access Stratum (NAS) signaling, NAS signaling security, mobility management between 3GPP networks, location management of an idle mode UE, roaming, authentication, and bearer management.
  • NAS Non Access Stratum
  • the SGW 205 includes mobility management between eNBs, mobility management between 3GPP networks, idle mode downlink packet buffering, lawful interception, packet routing and packet routing of E-UTRAN idle mode downlink. and forwarding).
  • the PGW 207 also includes policy enforcement, per-user based packet filtering, charging support, lawful interception, and UE IP allocation. ), Packet screening, and the like.
  • the Serving GPRS Support Node (SGSN) 209 is an entity related to legacy packet network (GPRS), and the Home Subscriber Server (HSS) 213 manages user subscription information and location information. It will be apparent to those skilled in the art that the above-mentioned entities may have additional functions.
  • FIG. 3 illustrates a procedure for performing inbound handover according to a preferred embodiment of the present invention.
  • a user terminal performs a scanning process for neighboring cells for intra-frequency and inter-frequency handover configured by a macro base station (eNB) serving as a serving base station. For example, as the user terminal enters a specific femto cell region, the user terminal determines whether a signal strength from the femto base station HeNB measured through a scanning process is greater than or equal to a predetermined threshold. In this case, the predetermined threshold may be set in advance to determine the necessity of handover.
  • the user terminal transmits a measurement report message to the macro base station if a signal strength of a predetermined threshold or more exists (step 301).
  • the measurement report message includes the PCID of the destination femto cell capable of inbound handover of the user terminal.
  • the destination femto cell corresponds to a femto cell in which signal strength above a predetermined threshold is measured.
  • splits exist in PCIDs identifying a femto cell and may be used to identify a CSG cell. That is, a group of several PCIDs among the total PCIDs may be reserved for the CSG cell only. Accordingly, if the PCID has information on the split, the user terminal and the macro base station may distinguish whether the corresponding femto cell is a CSG cell by the PCID of the femto cell.
  • the macro base station examines PCID information included in the measurement report message received from the user terminal and then checks whether there is a PCID confusion (step 303).
  • the macro base station proceeds to step 311 to perform a handover preparation procedure. If the PCID confusion problem does not exist, the destination femto cell can be identified using the PCID included in the measurement report message. In this case, access control for the user terminal may be performed by the core network, and a detailed description thereof will be described later.
  • the macro base station If the macro base station cannot identify the destination femto cell using the PCID, a procedure for identifying the destination femto cell is performed (steps 305 to 309). In this case, the macro base station sets a measurement gap.
  • the measurement gap is information required for the user terminal to obtain system information of a destination femto cell.
  • the macro base station transmits an RRC connection reconfiguration message (hereinafter referred to as an 'RCR message') including information on the measurement gap (measurement gap parameters) to the user terminal (step 305). This assigns the set measurement gap to the mobile terminal.
  • the RCR message includes a "measConfig” field which is an information element.
  • the "measConfig” field there is a “measGapConfig” field which is a sub information element.
  • the "measGapConfig” field may include measurement gap parameters.
  • the user terminal may obtain system information of a destination femto cell by using measurement gap parameters included in the RCR message.
  • the user terminal may resolve the PCID confusion using the system information and perform preliminary access control.
  • System information (or system information message) transmitted by the base station is information commonly required in a cell and is used for network connection of a user terminal.
  • the system information includes a scheduling block that aggregates various system information, one master information block (hereinafter referred to as MIB) for network information, and a plurality of various system information blocks. Block, hereinafter referred to as 'SIB'.
  • MIB master information block
  • 'SIB' Block
  • the system information is periodically transmitted to the user terminal by the base station, and each SIB may be divided into a plurality of divided blocks.
  • the user terminal receives the system information through a specific channel (eg, Broadcast Control Channel (BCCH)) from a network (eg, EUTRAN) that manages the cell to which it belongs.
  • BCCH Broadcast Control Channel
  • EUTRAN a network that manages the cell to which it belongs.
  • the user terminal acquires information necessary for access to the network, including core network information or network information, through the system information.
  • the MIB uses fixed scheduling having a 40 ms period, and repeated transmission is performed within 40 ms.
  • SIB uses fixed scheduling with an 80ms period, and repetitive transmission is made within 80ms.
  • the measurement gap may be set as shown in Table 1 based on the transmission scheduling information of the MIB and the SIB.
  • the measurement gap parameter is composed of a gap pattern, a repetition period, a gap length, and a start subframe.
  • the measurement gap parameter is included in the RCR message and transmitted to the user terminal.
  • the user terminal may acquire the MIB and SIB included in the system information of the destination femto cell by setting the measurement gap to obtain the transmission schedule information of the MIB and the SIB.
  • the user terminal can obtain the system information of the destination femtocell.
  • the measurement gap adversely affects voice calls in progress and can degrade call quality. Therefore, the setting of the measurement gap should be minimized.
  • the user terminal uses a MIB and SIB information to identify a cell global identifier (CGI), a tracking area identifier (TAI), and a CSG identifier of a destination femto cell. Closed Subscriber Group Identification (hereinafter referred to as "CSG ID”) information can be obtained.
  • CGI cell global identifier
  • TAI tracking area identifier
  • CSG ID Closed Subscriber Group Identification
  • the user terminal may resolve the PCID confusion by providing the CGI or the CGI and the TAI information to the macro base station.
  • the user terminal may perform preliminary access control using CSG ID information.
  • the user terminal constructs a measurement report message and transmits the measurement report message to the macro base station (step 307).
  • the measurement report message includes CGI and Pre-AC result information, and may further include TAI information.
  • a new Boolean Type information element, "Pre-AC result,” is added to the "MeasResult" field of the measurement report message to notify the macro base station of the preliminary access control result performed by the user terminal. If the CSG ID of the destination femto cell is included in the allowed CSG list of the user terminal, since the user terminal can access the destination femto cell, the pre-AC result is set to "TRUE". Otherwise, if the CSG ID of the destination femto cell is not included in the allowed CSG list of the user terminal, since the user terminal cannot access the destination femto cell, the pre-AC result is set to "FALSE".
  • the reason for performing the preliminary access control in the user terminal is unnecessary signaling by initiating a handover preparation procedure according to the preliminary access control result of the user terminal in the macro base station. This is because the overhead can be reduced.
  • the macro base station When the macro base station receives the measurement report message from the user terminal, the macro base station releases the measurement gap setting used to obtain system information.
  • the macro base station includes " pre-AC result " information included in the measurement report message.
  • Read to check the preliminary access control results of the user terminal step 309). If the preliminary access control result is "TRUE”, the macro base station moves to step 311 to start a handover preparation procedure. On the other hand, when the preliminary access control result is "FALSE", the macro base station terminates preparation for handover.
  • the macro base station transmits a handover request message to the MME to initiate a handover preparation procedure (step 311).
  • the handover request message includes information on a destination femto cell.
  • the destination femto cell can be identified through the CGI reported by the user terminal.
  • the MME When the MME receives a handover request message from the macro base station, the MME performs access control of a user terminal to a destination femto cell. Even if the user terminal performs preliminary access control, the MME performs access control again. This is because the user terminal may report an incorrect "pre-AC result".
  • the MME uses an handover request message received from the macro base station to refer to an International Mobile Subscriber Identity (hereinafter referred to as "IMSI”) and a destination femto cell ID (hereinafter referred to as "HeNB ID”) of a user terminal. Is determined.
  • the MME may determine the HeNB ID from the "Target ID" field in the handover request message. Meanwhile, IMSI of the user terminal is stored in advance in the MME.
  • the MME checks whether it has an allowed CSG list (Allowed CSG List, hereinafter 'ACL') and a CSG ID of the destination femto cell in its database (step 313). If the MME has the allowed CSG list and the CSG ID of the destination femto cell, access control of the user terminal is performed (step 323). On the other hand, if the MME does not have the allowed CSG list and the CSG ID of the destination femto cell, the operations in steps 315 to 321 are performed.
  • Allowed CSG List hereinafter 'ACL'
  • the MME transmits an allowed CSG list request message to the HSS to obtain the allowed CSG list of the user terminal (step 315).
  • the ACL request message includes the IMSI of the user terminal.
  • the HSS sends an ACL response message to the MME in response to the ACL request message (step 317).
  • the HSS may identify the allowed CSG list of the user terminal by using IMSI of the user terminal included in the ACL request message. Accordingly, the HSS transmits the allowed CSG list of the corresponding user terminal to the MME by including the ACL response message.
  • the MME sends a CSG ID request message to a femto base station HeNB to obtain a CSG ID of the destination femto cell (step 319).
  • the CSG ID request message includes the HeNB ID.
  • the femto base station transmits a CSG ID response message to the MME in response to the CSG ID request message (step 321).
  • the femto base station may identify the CSG ID of the corresponding destination femto cell using the HeNB ID included in the CSG ID request message. Accordingly, the femto base station includes the CSG ID of the corresponding destination femto cell in the CSG ID response message and transmits it to the MME.
  • the MME When the MME obtains the allowed CSG list of the user terminal and the CSG ID of the destination femto cell from the HSS and the femto base station, the MME performs access control for the user terminal.
  • the MME can determine whether the user terminal can access the destination femto cell by checking whether the CSG ID of the destination femto cell is included in the allowed CSG list of the user terminal. In the above-described process, the MME may perform access control on the user terminal.
  • the MME continues to perform a handover procedure (steps 327, 329, 331).
  • the user terminal transmits a handover failure message to the macro base station (step 325).
  • the macro base station completes preparation for handover.
  • the MME transmits a handover request message to the femto base station (step 327).
  • the femto base station transmits a handover response message to the MME in response to the handover request message (step 329).
  • the MME Upon receiving the handover response message, the MME transmits a handover command message to the macro base station (step 331).
  • the macro base station performs a general handover procedure after receiving the handover command message (step 333).
  • a new handover method may be defined. That is, the method for performing handover may solve the existing PCID confusion problem and may newly define signaling for access control and handover preparation of the user terminal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/KR2010/008836 2009-12-10 2010-12-10 중첩 네트워크 환경에서 핸드오버를 수행하기 위한 방법 및 장치와 시스템 Ceased WO2011071332A2 (ko)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/514,676 US8938228B2 (en) 2009-12-10 2010-12-10 Method, apparatus and system for performing handover in an overlapping network environment
EP10836227.8A EP2512182A4 (de) 2009-12-10 2010-12-10 Verfahren, vorrichtung und system zur durchführung einer übergabe in einer überlappenden netzwerkumgebung

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KR1020090122497A KR20110065825A (ko) 2009-12-10 2009-12-10 중첩 네트워크 환경에서 핸드오버를 수행하기 위한 방법 및 시스템
KR10-2009-0122497 2009-12-10

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WO2011071332A3 WO2011071332A3 (ko) 2011-11-10

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US8938228B2 (en) 2015-01-20
EP2512182A4 (de) 2017-02-22
KR20110065825A (ko) 2011-06-16
WO2011071332A3 (ko) 2011-11-10
US20120315908A1 (en) 2012-12-13

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