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WO2012033316A2 - Procédé et dispositif de transfert radio unique avec commande réseau entre des réseaux sans fil hétérogènes - Google Patents

Procédé et dispositif de transfert radio unique avec commande réseau entre des réseaux sans fil hétérogènes Download PDF

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Publication number
WO2012033316A2
WO2012033316A2 PCT/KR2011/006547 KR2011006547W WO2012033316A2 WO 2012033316 A2 WO2012033316 A2 WO 2012033316A2 KR 2011006547 W KR2011006547 W KR 2011006547W WO 2012033316 A2 WO2012033316 A2 WO 2012033316A2
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WO
WIPO (PCT)
Prior art keywords
network
handover
mobile terminal
access information
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2011/006547
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English (en)
Korean (ko)
Other versions
WO2012033316A3 (fr
Inventor
지정훈
전홍석
안윤영
박창민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020110065659A external-priority patent/KR20120026441A/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US13/821,884 priority Critical patent/US20130170389A1/en
Publication of WO2012033316A2 publication Critical patent/WO2012033316A2/fr
Publication of WO2012033316A3 publication Critical patent/WO2012033316A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04W36/0083—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
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data

Definitions

  • the present invention relates to a method for a mobile terminal to reduce access delay and packet loss during handover between heterogeneous wireless networks.
  • Service providers that provide services such as Internet based multimedia subsystems (IMS) to mobile terminals are providing services through various heterogeneous access technologies and networks.
  • mobile terminals are often configured to operate in a multi-mode such that multiple network accesses are possible. If the mobile terminal is configured to allow multiple network accesses, there is a need for a technique for receiving a seamless service while reducing the connection delay in the handover between heterogeneous networks.
  • a single radio handover has been proposed to reduce connection delay in handover between heterogeneous network accesses.
  • Single radio handover means that only one access interface of the current access network remains available for transmission and reception during handover, while other access interfaces remain in a state where transmission is impossible, that is, only reception or no reception is possible. The method of performing handover.
  • the present invention it is possible to minimize the state in which the multiple radio access interfaces are simultaneously activated, thereby reducing the interference between the radio access interfaces and enabling the quality measurement of the multi radio link.
  • FIG. 1 is a diagram illustrating a network in which a network controlled single radio handover is performed according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an example of a wireless network distribution.
  • FIG. 3 is a diagram illustrating a process of a network controlled single radio handover method according to an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a configuration of a mobile terminal for performing network controlled single radio handover according to an embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a configuration of a handover controller for performing a network controlled single radio handover according to an embodiment of the present invention.
  • a handover controller may include a communication unit configured to communicate with a mobile terminal performing a single radio handover and an information server managing connection information for each wireless network, and a network accessible through a communication unit at a current location of the mobile terminal. Acquiring multi-RAT access information used for access from an information server, obtaining network quality measurement results measured using the multi-RAT access information from the mobile terminal, and determining a target network of the mobile terminal using the network quality measurement results. It includes a handover decision unit.
  • a mobile terminal for performing a single radio handover, an information server for managing access information for each wireless network, and a method for operating a handover controller connected to the mobile terminal and the information server may include a current location of the mobile terminal.
  • the handover controller includes multi-RAT access information and uses network quality by using the multi-RAT access information. Transmitting a network quality measurement message requesting measurement to a mobile terminal, receiving network quality measurement results measured using multi-RAT access information included in the network quality measurement message from the mobile terminal, and network quality measurement results Using the destination network And a determining step.
  • a mobile terminal includes: an interface unit including a plurality of wireless connection interfaces to connect to a plurality of heterogeneous wireless networks, and connected to the first network through a first interface which is one of the plurality of wireless connection interfaces; If a network quality measurement request including multi-RAT access information used to connect to a wireless network adjacent to the current location of the mobile terminal is received from the handover controller through the first interface, at least one network using the multi-RAT access information is received.
  • a network quality measurement unit for measuring quality and transmitting at least one network quality measurement result to a handover controller through a first interface, and a message instructing to perform handover including destination network connection information from the handover controller is received.
  • To the desired network comprising: a handover to perform the handover.
  • a method of operating a mobile terminal connected to a handover controller connected to an information server for managing access information for each wireless network wherein the mobile terminal controls the handover through a first interface that is one of a plurality of wireless access interfaces.
  • a system for performing a network controlled single radio handover including a mobile terminal performing a single radio handover according to another aspect, an information server managing access information for each wireless network, and a handover controller connected to the mobile terminal and the information server
  • the method of operation may include multi-RAT access information including wireless network connection information used to connect to a network accessible at the current location of the mobile terminal as the information server receives a network connection information request message from the handover controller.
  • FIG. 1 is a diagram illustrating a network in which a network controlled single radio handover is performed according to an embodiment of the present invention.
  • the system in which the network control single radio handover of FIG. 1 is performed includes a mobile terminal 110 (Multi-Mode MS), a handover controller 120 (HandOver Controller), an information server 130 and a plurality of PoAs ( 140, 150, 160; Point of Attachment).
  • the handover controller 120 may be called a handover controller or a handover control device.
  • the mobile terminal 110 includes a multimode interface composed of a plurality of radio access interfaces for accessing a heterogeneous network.
  • the mobile terminal 110 may include various types of interfaces such as a worldwide interoperability for microwace access (WiMAX) network interface, a WiFi network interface, a 3rd generation partnership project (3GPP) network interface, and the like as a multimode interface.
  • WiMAX worldwide interoperability for microwace access
  • WiFi WiFi network interface
  • 3GPP 3rd generation partnership project
  • the multimode interface may be defined as an integrated type of heterogeneous network interfaces or may include some or all of several network interface types separately attached to a terminal.
  • the multimode interface may be substituted and changed in various implementation manners.
  • the mobile terminal 110 may be various mobile devices such as a mobile phone, a smart phone, a personal digital assistant (PDA), a personal computer, a laptop, and the like.
  • PDA personal digital assistant
  • the mobile terminal 110 performs handover according to a single radio handover scheme. Accordingly, the mobile terminal 110 maintains only a single access interface of the current access network in a state capable of transmitting and receiving, and operates the other access interface in a state in which transmission is impossible, that is, only reception or even no reception is possible.
  • the handover controller 120 is connected to the mobile terminal 110 and the information server 130. As illustrated in FIG. 1, the handover controller 120 may be connected to the mobile terminal 110 through a PoA 140 of a network in which the mobile terminal 110 is currently connected and in service to perform message transmission and reception. . Alternatively, the message exchange between the handover controller 120 and the mobile terminal 110 may be performed through a medium access control (MAC) protocol or an upper IP transmission protocol (eg, UDP).
  • MAC medium access control
  • UDP upper IP transmission protocol
  • the information server 130 stores access information for each wireless network for each heterogeneous network.
  • the wireless network access information may be stored in association with current location information of the mobile terminal 110.
  • the location information may be of various forms that can specify the location of the mobile terminal 110, such as global positioning system (GPS) information, radio cell location information, and point of attachment (PoA) identification information of layer 2 (L2). Information may be used.
  • the access information for each wireless network of the information server 130 may be configured as heterogeneous wireless network access information adjacent to one wireless network based on the access information of one wireless network.
  • the information server 130 may transmit wireless network access information for the heterogeneous network to the handover controller 120 at the request of the handover controller 120.
  • the information server 130 receives a network connection information request message including the location information of the mobile terminal 110 from the handover controller 120, the mobile terminal 110 is accessible or at the corresponding location. May be configured to retrieve all wireless network connection information adjacent to the.
  • the plurality of PoAs 140, 150, and 160 are devices such as a WiFi access point (AP) or a cellular and a WiMAX base station (BS) that provide a wired or wireless link connection of the mobile terminal 110.
  • AP WiFi access point
  • BS WiMAX base station
  • FIG. 2 is a diagram illustrating an example of a wireless network distribution.
  • Table 1 below shows an example of connection information for each wireless network established in the information server 130 with reference to FIG. 2.
  • the wireless network access information for the heterogeneous network of the information server 130 of Table 1 is composed of heterogeneous wireless network access information adjacent to the location indicated by the 3GPP radio cell information based on the 3GPP radio cell information.
  • Table 1 Broadband 3GPP Wireless Access Information WiMAX Wireless Information WiFi wireless connection information Ca Ma Cb Mb Fa, Fb
  • the information server 130 when the information server 130 receives a network access information request message in which the location information of the mobile terminal 110 is Ca, the wireless network accessible from the location is connected to the broadband 3GPP network and the WiMAX network.
  • the wireless network access information corresponding to Ca and Ma is transferred to the handover controller 120.
  • the location information of the mobile terminal 110 receives a network access information request message of Cb, the wireless network accessible from the location is identified as a broadband 3GPP network, a WiMAX network, and a WiFi network, and is assigned to Cb, Mb, Fa, and Fb.
  • the wireless network access information is transmitted to the handover controller 120.
  • Table 1 exemplifies a case where adjacent heterogeneous wireless network access information is constructed based on 3GPP radio cell information, but heterogeneous wireless network access information of the information server 130 may be constructed in various forms.
  • FIG. 3 is a diagram illustrating a process of a network controlled single radio handover method according to an embodiment of the present invention.
  • the handover controller 120 determines the current location of the mobile terminal 110 and requests the information server 130 for wireless network connection information used to access a network accessible from the current location of the mobile terminal 110 ( 310).
  • the handover controller 120 may obtain location information of the mobile terminal 110 through various methods. For example, when the mobile terminal 110 moves from the currently connected PoA 140 to the candidate PoA 1 150, the mobile terminal 110 may be notified of the location change from the candidate PoA 1 150 or the mobile terminal 110. .
  • the location information of the mobile terminal 110 the location information of the cell (Cell) currently connected to the terminal 110, L2 PoA (Point of Attachment) identification information, GPS information, and the like may be used.
  • L2 PoA Point of Attachment
  • the information server 130 may respond to the query of the handover controller 120 with a network connection information response message in response to the network connection information request of the handover controller 120 (320).
  • the network connection information response message transmitted by the information server 130 to the handover controller 120 to respond to the query is accessible from the current location of the mobile terminal 110 other than the network to which the mobile terminal 110 is currently connected. All wireless network connection information is included.
  • the access information for all wireless networks accessible from the current location of the mobile terminal 110 may be referred to as multi-radio access technology access information.
  • the multi-RAT access information includes information for accessing each radio link.
  • the multi-RAT access information may include a RAT type, a carrier frequency, a Point of Attachment (PoA) identifier supporting a L2 connection, a preamble, a PHY profile ID, and the like.
  • PoA Point of Attachment
  • the RAT type indicates the type of wireless network (eg WiMax, WiFi, 3GPP).
  • the carrier frequency represents frequency information used to connect to the wireless network.
  • the PoA identifier supporting the L2 connection means an identifier of each PoA.
  • the preamble means an information value for synchronizing with the PoA, and the PHY profile ID includes physical connection information.
  • Such multi-RAT access information is exemplary, and detailed information constituting the multi-RAT access information may vary according to the type of the wireless network.
  • the handover controller 120 transmits a network quality measurement request message (Single Radio scan request) to the mobile terminal 110 to request link quality measurement of the multi-radio radio (330).
  • the network quality measurement request message includes the multi-RAT access information received from the information server 130.
  • the network quality measurement request message may be transmitted through a wireless access interface of a network to which the multimode mobile terminal 110 is currently connected.
  • the network quality measurement request message may be transmitted through a protocol on IP or an L2 frame of a currently connected network.
  • the mobile terminal 110 measures the wireless network quality by using the multi-RAT access information received from the handover controller 120 (340). In this case, when there are a plurality of wireless networks to which the mobile terminal 110 can connect, the multi-radio radio link quality measurement may be performed. When the power of the wireless access interface used for accessing the network included in the multi-RAT access information is turned off (Power-Off), the mobile terminal 110 supplies power to the corresponding wireless access interface to switch to a state in which reception is possible. The network quality can be measured by analyzing the received signal.
  • the mobile terminal 110 transmits the network quality measurement result to the handover controller 120 through a single radio scan response message (350).
  • the handover controller 120 determines a target network to which the mobile terminal 110 should handover by using the network quality measurement result received from the mobile terminal 110 (360).
  • a plurality of network quality measurement results may be compared to determine a network showing the best quality as the destination network.
  • the handover controller 120 includes the determined destination network information to the mobile terminal 110 and transmits a message instructing to handover to the destination network (370).
  • the mobile terminal 110 performs the handover to the destination network determined by the handover controller 120.
  • the mobile terminal 110 may activate a radio access interface for accessing the determined destination network and deactivate the radio access interface used to access the previous network.
  • the procedure for performing handover may vary according to the type of wireless network.
  • the wireless connection information based on the current location of the mobile terminal is secured in advance from the information server before the handover controller on the network receives a handover command to the mobile terminal.
  • the mobile terminal can easily perform quality measurement of the multi-radio link.
  • the present invention it is possible to minimize the state in which the multiple radio access interfaces are simultaneously activated to reduce the interference between the radio access interfaces and to measure the quality of the multi radio link.
  • FIG. 4 is a block diagram illustrating a configuration of a mobile terminal 110 for performing a network controlled single radio handover according to an embodiment of the present invention.
  • the mobile terminal 110 may include an interface unit 410, a network quality measuring unit 420, and a handover performing unit 430.
  • the interface unit 410 includes a plurality of wireless connection interfaces 412, 414, 416. Multiple wireless access interfaces 412, 414, 416 may be heterogeneous interfaces used to connect to heterogeneous wireless networks. Although three interfaces are illustrated in FIG. 3, the type and number of wireless access interfaces included in the interface unit 410 are not limited.
  • the mobile terminal 110 may operate according to a single radio handover. In this case, only one wireless access interface is activated in the interface unit 410 to maintain the network connected to and transmitted through the corresponding interface. The other wireless access interface is in a state in which transmission is impossible, that is, only reception is possible. Operation remains impossible until reception.
  • the first interface 412 is currently active, and the remaining interfaces 414 and 416 are deactivated.
  • a quality measurement request message including multi-RAT access information used to access an adjacent PoA at the current location of the mobile terminal 110 is received.
  • the unit 420 performs network quality measurement that can be accessed using the multi-RAT access information.
  • the network quality measurement unit 420 may check whether an interface for accessing the wireless network included in the multi-RAT access information is operating. For example, when the second interface 414 is used to access a wireless network included in the RAT access information, the network quality measuring unit 420 may turn off the second interface 414 if the second interface 414 is turned off. Powered to 414 may be controlled to operate.
  • the network quality measurer 420 may measure network quality by using a signal received by the second interface 414 through the corresponding wireless network by using the multi-RAT access information.
  • the network quality measuring unit 420 may include the second interface 414 and the third interface when the interfaces for accessing the wireless network included in the multi-RAT access information are the second interface 414 and the third interface 416.
  • Each signal received from 416 may be used to measure network quality.
  • the network quality measurer 420 may measure network quality using various parameters such as signal strength, signal quality, and received power strength parameters of the received signal.
  • the network quality measurer 420 transmits a quality measurement result response message including the measured network quality information to the handover controller 120 through the first interface 412.
  • the handover command may be received from the handover controller 120 through the first interface 412 including destination network connection information for the destination network determined based on the information of the quality measurement result response message. Then, the handover performer 430 performs a handover according to the handover command. When the second interface 414 is used to connect to the destination network, the handover performer 430 activates the second interface 414 to transmit and receive a signal through the second interface 414, and the remaining interface ( 412 and 416 may control the interface unit 410 to be deactivated.
  • FIG. 5 is a block diagram showing the configuration of a handover controller 120 for performing a network controlled single radio handover according to an embodiment of the present invention.
  • the handover controller 120 may include a communication unit 510 and a handover determination unit 520.
  • the communication unit 510 includes a communication interface for communicating with the mobile terminal 110 and the information server 130 for managing the connection information for each wireless network.
  • the handover decision unit 520 determines the current location of the mobile terminal 110.
  • the handover decision unit 520 controls the communication unit 510 to be used to access the network including the current location of the mobile terminal 110 to the information server 130 and accessible from the current location of the mobile terminal 110. You can request network connection information.
  • the handover decision unit 520 sends a network connection information response message including the multi-RAT access information used to access the network adjacent to the current location of the mobile terminal 110 from the information server 130 through the communication unit 510.
  • the handover decision unit 520 includes the received multi-RAT access information and transmits a quality measurement request message for requesting quality measurement of a network accessible by using the multi-RAT access information through the communication unit 510 to the mobile terminal 110. To transmit.
  • the handover determination unit 520 determines the destination network to which the mobile terminal 110 performs handover by using the received quality measurement result. do. Then, the handover decision unit 520 transmits a message to the mobile terminal 110 instructing the handover to the destination network determined through the communication unit 510.
  • the invention can also be embodied as computer readable code on a computer readable recording medium.
  • Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). It also includes.
  • the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif et un procédé permettant d'effectuer un transfert intercellulaire grâce à la détection de l'état d'un autre réseau sans fil lorsque seule une interface d'accès sans fil destinée à un réseau d'accès actuel est activée sur un terminal mobile. Un contrôleur de transfert intercellulaire se charge de la communication entre un terminal mobile effectuant un transfert radio unique et un serveur d'informations gérant les informations d'accès pour chaque réseau sans fil. Ledit contrôleur de transfert intercellulaire obtient des informations d'accès RAT multiple servant à accéder à un réseau qui est accessible à la position actuelle dudit terminal mobile. Le contrôleur de transfert intercellulaire obtient un résultat de mesure de la qualité du réseau, mesuré à l'aide des informations d'accès RAT multiple, en provenance du terminal mobile, et il détermine un réseau cible pour le terminal mobile au moyen de ce résultat de mesure de la qualité du réseau.
PCT/KR2011/006547 2010-09-09 2011-09-05 Procédé et dispositif de transfert radio unique avec commande réseau entre des réseaux sans fil hétérogènes Ceased WO2012033316A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/821,884 US20130170389A1 (en) 2010-09-09 2011-09-05 Network control single radio handover method and device between heterogeneous wireless networks

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2010-0088598 2010-09-09
KR20100088598 2010-09-09
KR10-2011-0065659 2011-07-01
KR1020110065659A KR20120026441A (ko) 2010-09-09 2011-07-01 이기종 무선 네트워크간 네트워크 제어 단일 라디오 핸드오버 방법 및 장치

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WO2012033316A2 true WO2012033316A2 (fr) 2012-03-15
WO2012033316A3 WO2012033316A3 (fr) 2012-05-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018131904A1 (fr) * 2017-01-12 2018-07-19 주식회사 케이티 Procédé de commande de transfert de réseau hétérogène, et appareil associé
US10660004B2 (en) 2017-01-12 2020-05-19 Kt Corporation Method for controlling heterogeneous network handover and apparatus therefor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100975740B1 (ko) * 2007-03-23 2010-08-12 삼성전자주식회사 이종 무선 통신 네트워크에서 핸드오버 방법 및 장치
US8594069B2 (en) * 2007-08-06 2013-11-26 Qualcomm Incorporated In-order data delivery during handover in a wireless communication system
KR101467780B1 (ko) * 2007-10-17 2014-12-03 엘지전자 주식회사 이기종 무선접속망간 핸드오버 방법
KR101565921B1 (ko) * 2008-10-10 2015-11-16 삼성전자주식회사 이종망으로의 핸드오버를 위한 정보 제공 시스템 및 이를 위한 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018131904A1 (fr) * 2017-01-12 2018-07-19 주식회사 케이티 Procédé de commande de transfert de réseau hétérogène, et appareil associé
US10660004B2 (en) 2017-01-12 2020-05-19 Kt Corporation Method for controlling heterogeneous network handover and apparatus therefor

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