WO2010101228A1 - Terminal sans fil et procédé de commande de transfert - Google Patents

Terminal sans fil et procédé de commande de transfert Download PDF

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Publication number
WO2010101228A1
WO2010101228A1 PCT/JP2010/053583 JP2010053583W WO2010101228A1 WO 2010101228 A1 WO2010101228 A1 WO 2010101228A1 JP 2010053583 W JP2010053583 W JP 2010053583W WO 2010101228 A1 WO2010101228 A1 WO 2010101228A1
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WO
WIPO (PCT)
Prior art keywords
communication
base station
handover
application
communication delay
Prior art date
Application number
PCT/JP2010/053583
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English (en)
Japanese (ja)
Inventor
充治 千田
Original Assignee
京セラ株式会社
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
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to JP2011502809A priority Critical patent/JP5361986B2/ja
Publication of WO2010101228A1 publication Critical patent/WO2010101228A1/fr

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    • 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
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters

Definitions

  • the present invention relates to a radio terminal and a handover control method capable of performing handover between different cells or different communication systems.
  • a wireless terminal performs handover (also referred to as handoff) for switching a connection destination from a first base station to a second base station having better wireless communication quality than the first base station during movement or the like. )I do.
  • handover between different cells and handover between base stations of different wireless communication methods (hereinafter referred to as “heterogeneous communication methods”).
  • a wireless terminal corresponding to “inter-handover” is provided.
  • a wireless terminal performs a handover, for example, between a macro cell base station and a femto cell base station (see Patent Document 1).
  • the femtocell base station is a small base station mainly installed indoors.
  • a wireless terminal performs handover between base stations that use different wireless communication schemes among radio communication schemes such as OFDMA, CDMA, and TDMA.
  • a wireless terminal that can perform handover between different cells or different communication methods may not always be able to execute an application under the same conditions as before the handover, depending on the type of application being executed. Absent.
  • a wireless terminal executes an application with limited communication delay (voice communication such as VoIP)
  • voice communication such as VoIP
  • the wireless terminal performs a handover to a base station with a large communication delay or a base station with which the communication delay is not guaranteed
  • the performance of the application cannot be fully exhibited, and there is a problem that the convenience of the user is impaired.
  • an application file download application
  • the wireless terminal performs a handover to a base station with a small communication capacity, the same problem as described above occurs.
  • the present invention provides a wireless terminal capable of avoiding that the performance of the application cannot be sufficiently exhibited due to handover even when handover is performed between different cells or different communication methods while executing the application.
  • An object is to provide a handover control method.
  • a feature of the wireless terminal of the present invention is a wireless terminal that performs communication via a connection-destination base station, and controls a handover that switches the connection destination from the first base station to the second base station. And the control unit regulates the handover according to a switching destination communication delay that is a communication delay when the communication is performed by connecting to the second base station.
  • control unit is a case where an application to be controlled is an application whose communication delay is limited, and the switching destination communication delay is connected to the first base station to perform the communication. If it is larger than the switching source communication delay which is the communication delay in the case, the handover is restricted.
  • the control unit regulates the handover.
  • control unit cancels the handover restriction when the wireless communication quality between the first base station and the wireless terminal falls below a predetermined level in a state where the handover is restricted. To do.
  • control unit detects the switching destination communication delay based on a cell type of the second base station.
  • the control unit when the application to be controlled is an application that requires a communication capacity that is equal to or greater than a predetermined capacity, the control unit is a communication capacity when the communication is performed by connecting to the first base station. Detecting a switching source communication capacity and a switching destination communication capacity that is a communication capacity when connecting to the second base station and performing the communication, and the detected switching destination communication capacity is greater than the switching source communication capacity If it is smaller, the handover is restricted.
  • control unit detects the switching destination communication capacity based on a wireless communication method used by the second base station.
  • the control unit regulates the handover, and the femto A cell base station is a base station connected to a backbone communication network via a public communication network with indefinite communication delay.
  • a feature of the handover control method of the present invention is a handover control method for controlling handover of a wireless terminal that performs communication via a connection destination base station, wherein the connection destination is changed from a first base station to a second base station. And a step of controlling a handover to be switched, wherein the step of controlling regulates the handover according to a switching destination communication delay which is a communication delay when the communication is performed by connecting to the second base station.
  • a terminal and a handover control method can be provided.
  • FIG. 1 is a schematic configuration diagram of a communication system including a wireless terminal according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing the configuration of the wireless terminal according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating base station information stored in the wireless terminal according to the embodiment of the present invention.
  • FIG. 4 is a flowchart showing a basic operation of the wireless terminal according to the embodiment of the present invention.
  • FIG. 5 is a flowchart showing an additional operation of the wireless terminal according to the embodiment of the present invention.
  • FIG. 1 is a schematic configuration diagram of a communication system 1 including a wireless terminal 100 according to the present embodiment.
  • the radio terminal 100 is a radio terminal that supports both handovers between different types of cells and handover between different types of communication schemes.
  • the radio terminal 100 is wirelessly connected to any one of the macrocell base station 10, the femtocell base station 20, and the macrocell base station 30, and directly or indirectly connected to the backbone communication network 40 via the connection destination base station.
  • Packet communication is performed with the communication destination device 50.
  • a voice call application, a file download application, an interactive game application, or a mail application is used for the packet communication.
  • Each of the macrocell base station 10, the femtocell base station 20, and the macrocell base station 30 forms a cell that is a communicable area.
  • the macro cell base station 10 and the macro cell base station 30 form a large cell (macro cell) of about several hundred meters to several kilometers.
  • the femtocell base station 20 is a small base station that is mainly installed indoors, and forms a small cell (femtocell) of about several meters to several tens of meters.
  • the femtocell base station 20 may be arranged in a macro cell.
  • the femtocell base station 20 is connected to the backbone communication network 40 via a public communication network 25 that is a commercial line such as FTTH, DSL, or CATV. Since the backbone communication network 40 is managed by a communication carrier and configured using a dedicated line, the upper limit of communication delay is guaranteed. On the other hand, in the public communication network 25, the upper limit of communication delay is generally not guaranteed.
  • the macrocell base station 10 and the femtocell base station 20 are configured according to LTE (E-UTRAN) which is one of 3.9 generation mobile phone systems.
  • the macrocell base station 30 is configured according to GSM, which is a second generation mobile phone system.
  • LTE the OFDMA method is used as a wireless communication method.
  • LTE a large communication capacity of up to about 100 Mbps (downstream theoretical value) is provided.
  • GSM the TDMA method is used as a wireless communication method.
  • GSM a small communication capacity of about 171 kbps (downstream theoretical value) is provided.
  • the communication capacity (theoretical value) of LTE is nearly 600 times the communication capacity (theoretical value) of GSM, and the difference in communication capacity is large.
  • the wireless communication unit 110 includes an LNA, a power amplifier, an up converter, a down converter, and the like, and transmits and receives wireless signals to and from a wireless base station to which the wireless communication unit 110 is wirelessly connected.
  • the wireless communication unit 110 has a configuration corresponding to a plurality of wireless communication methods.
  • the wireless communication unit 110 receives a signal (for example, a pilot signal) broadcast from a neighboring base station.
  • the control unit 120 is configured by a CPU, for example, and controls various functions provided in the wireless terminal 100.
  • the storage unit 130 is configured by a memory, for example, and stores various types of information used for control and the like in the wireless terminal 100.
  • the microphone 140 collects sound and inputs sound data based on the collected sound to the control unit 120.
  • the speaker 150 outputs sound based on the sound data acquired from the control unit 120.
  • the display unit 160 displays an image received through the control unit 120 and displays operation details.
  • the input unit 170 is configured by a numeric keypad, function keys, and the like, and is an interface used for inputting user operation details.
  • the control unit 120 includes a wireless communication quality measurement unit 121, an application execution unit 122, a detection unit 123, and a handover control unit 124.
  • the wireless communication quality measuring unit 121 measures the wireless communication quality (for example, received SNR or RSSI) from the signal received by the wireless communication unit 110.
  • the wireless communication quality measured by the wireless communication quality measuring unit 121 is notified to the handover control unit 124.
  • the handover control unit 124 controls handover for switching the connection destination from the neighboring base stations to a base station with better radio communication quality based on the radio communication quality corresponding to each base station.
  • the application execution unit 122 corresponds to the highest layer in the communication protocol stack, and executes the application as described above. Information regarding the application being executed in the application execution unit 122 is notified to the handover control unit 124.
  • the detection unit 123 includes a switching source communication delay that is a communication delay when performing communication via a base station (hereinafter referred to as a switching source base station) to which the wireless communication unit 110 is wirelessly connected, and A switching destination communication delay that is a communication delay when communication is performed by connecting to any one (hereinafter referred to as a switching destination base station) is detected.
  • the communication delay detected by the detection unit 123 is notified to the handover control unit 124.
  • the application executed in the application execution unit 122 is an application whose communication delay is limited, and the switching destination communication delay is larger than the switching source communication delay or the switching destination communication delay is indefinite. In this case, the handover to the switching destination base station is restricted.
  • the detection unit 123 has a switching source communication capacity that is a communication capacity when communication is performed by connecting to the switching source base station, and a communication capacity when communication is performed by connecting to the switching destination base station. The switching destination communication capacity is further detected.
  • the detection unit 123 may detect the communication capacity of the switching source base station from the communication capacity (actually measured value) in actual communication.
  • the detection unit 123 may detect the communication capacity using only the wireless communication method information in the attribute information.
  • the communication capacity detected by the detection unit 123 is notified to the handover control unit 124.
  • the handover control unit 124 Regulate handover.
  • the handover control unit 124 may cancel the handover restriction when the wireless communication quality between the switching source base station and the wireless terminal 100 falls below a predetermined level in a state where the handover is restricted.
  • FIG. 4 is a flowchart showing the basic operation of the radio terminal 100.
  • the handover control unit 124 starts this operation flow when the handover to the switching destination base station becomes possible based on the wireless communication quality measured with the wireless communication quality measuring unit 121 and the switching destination base station. To do.
  • the state where handover is possible is a state where, for example, the wireless communication quality with the switching destination base station is better than the wireless communication quality with the switching source base station.
  • step S12 the detection unit 123 detects the switching source communication delay and the switching destination communication delay by the above method.
  • step S13 the handover control unit 124 determines whether or not the switching destination communication delay is indefinite. That is, it is determined whether the upper limit of the switching destination communication delay is guaranteed. If it is determined that the switching destination communication delay is indefinite, the process proceeds to step S16. Otherwise, the process proceeds to step S14.
  • step S14 the handover control unit 124 determines whether or not the switching destination communication delay is larger than the switching source communication delay. If it is determined that the switching destination communication delay is greater than the switching source communication delay, the process proceeds to step S16. Otherwise, the process proceeds to step S15.
  • step S15 the handover control unit 124 executes handover to the switching destination base station. Specifically, the handover control unit 124 transmits a handover request to the switching destination base station, and then connects to the switching destination base station and disconnects from the switching source base station.
  • step S16 the handover control unit 124 regulates handover to the switching destination base station. That is, the handover control unit 124 stops the handover to the switching destination base station and waits until another switching destination base station is found. When another switching destination base station is found, this operation flow is applied again.
  • FIG. 5 is a flowchart showing the additional operation of the wireless terminal 100.
  • the wireless terminal 100 can execute the operation flow of FIG. 5 in addition to the operation flow of FIG.
  • FIG. 5 may be executed in parallel with the operation flow of FIG. 4 or may be executed only while an application requiring a large capacity is being executed.
  • the handover control unit 124 determines whether or not the application being executed in the application execution unit 122 is an application that requires a large capacity. For example, the handover control unit 124 performs the determination by acquiring application identification information from the application execution unit 122 or acquiring information indicating the presence or absence of capacity restriction from the application execution unit 122.
  • step S22 the detection unit 123 detects the switching source communication capacity and the switching destination communication capacity by the above method.
  • step S23 the handover control unit 124 determines whether or not the switching destination communication capacity is smaller than the switching source communication capacity. If it is determined that the switching destination communication capacity is smaller than the switching source communication capacity, the process proceeds to step S25; otherwise, the process proceeds to step S24.
  • step S25 the handover control unit 124 regulates handover to the switching destination base station. That is, the handover control unit 124 stops the handover to the switching destination base station and waits until another switching destination base station is found. When another switching destination base station is found, this operation flow is applied again.
  • the wireless terminal 100 when the wireless terminal 100 that is executing an application that requires a large capacity is connected to the macro cell base station 10, handover to the macro cell base station 30 can be regulated.
  • the switching destination communication delay is larger than the switching source communication delay.
  • the handover control unit 124 regulates the handover to the switching destination base station, so that it is possible to avoid the performance of the application from being sufficiently exhibited due to the handover.
  • the handover control unit 124 A handover to the switching destination base station can also be executed.
  • the handover control unit 124 cancels the handover restriction when the wireless communication quality between the switching source base station and the wireless terminal 100 falls below a predetermined level in a state where the handover is restricted. For this reason, the application can be continued by the handover before the application cannot be executed in the switching source base station.
  • the detection unit 123 detects a switching destination communication delay based on the cell type of the switching destination base station. Therefore, the switching destination communication delay can be easily detected without actually connecting to the switching destination base station and measuring the communication capacity.
  • the handover control unit 124 determines that the switching destination communication capacity is smaller than the switching source communication capacity. Restricts handovers. As a result, it is possible to avoid that the performance of the application cannot be sufficiently exhibited due to handover.
  • the detection unit 123 detects the switching destination communication capacity based on the wireless communication scheme used by the switching destination base station. Therefore, the switching destination communication capacity can be easily detected without actually connecting to the switching destination base station and measuring the communication capacity.
  • the handover control unit 124 regulates handover when the application executed in the application execution unit 122 is an application with a limited communication delay and the switching destination base station is a femtocell base station. To do. Thereby, the hand-over to a femtocell base station can be prevented more reliably.
  • the present invention has been described according to the embodiment. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.
  • the macro cell base station is exemplified as the base station whose communication delay is limited.
  • the base station is not limited to the macro cell base station and is connected to the backbone communication network without going through the public communication network.
  • a microcell base station may be used.
  • handover between LTE and GSM is taken as an example of handover between different types of communication methods, but not limited to between LTE and GSM, any combination is possible as long as it is a handover between different wireless communication methods.
  • UTRAN W-CDMA
  • cdma2000 defined by 3GPP2
  • a wireless communication system such as WiMAX or wireless LAN may be used.
  • the terminal initiated handover has been described, but the present invention may be applied to a base station initiated handover.
  • the switching destination base station is designated by the switching source base station.
  • the radio terminal 100 applies the above-described handover control to the designated switching destination base station, and when the designated switching destination base station does not satisfy the application restrictions, the handover to the switching destination base station is performed. Can be refused. That is, the radio terminal 100 executes a handover to the switching destination base station only when the switching destination base station designated by the switching source base station satisfies the application restrictions.
  • the wireless terminal and the handover control method according to the present invention have sufficient performance of the application along with the handover even when the handover is performed between different cells or different communication systems while the application is being executed. Therefore, it is useful in wireless communication such as mobile communication.

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

Abstract

La présente invention concerne un terminal sans fil (100) qui réalise une communication utilisant une application prédéterminée, par l'intermédiaire d'une station de base de destination. Une unité de commande (120) commande le passage d'un transfert d'une destination d'une première station de base à une seconde station de base. Lorsque l'application prédéterminée est une application dans laquelle un délai de communication est limité, l'unité de commande (120) détecte le délai de communication source, qui est le délai de communication lors de l'établissement d'une communication en connexion avec la première station de base, et le délai de communication de destination, qui est le délai de communication lors de l'établissement d'une communication en connexion avec la seconde station de base. Lorsque le délai de communication de destination détecté est supérieur au délai de communication de destination, ou lorsque le délai de communication de destination n'est pas défini, l'unité de commande (120) limite le transfert.
PCT/JP2010/053583 2009-03-04 2010-03-04 Terminal sans fil et procédé de commande de transfert WO2010101228A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011502809A JP5361986B2 (ja) 2009-03-04 2010-03-04 無線端末及びハンドオーバ制御方法

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JP2009051378 2009-03-04
JP2009-051378 2009-03-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012100106A (ja) * 2010-11-02 2012-05-24 Kyocera Corp 基地局装置およびハンドオーバ方法
KR20130142509A (ko) * 2012-06-19 2013-12-30 주식회사 케이티 서비스 제공 방법, 이를 지원하는 단말 및 서비스 제어 장치
JPWO2020202381A1 (fr) * 2019-03-29 2020-10-08
JPWO2020202382A1 (fr) * 2019-03-29 2020-10-08

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10191419A (ja) * 1996-12-27 1998-07-21 Matsushita Electric Ind Co Ltd 移動局装置
JP2006020270A (ja) * 2004-06-04 2006-01-19 Ntt Docomo Inc ハンドオーバー制御装置、無線リソース管理装置、ネットワークリソース管理装置、移動通信システム及びハンドオーバー制御方法
JP2008135939A (ja) * 2006-11-28 2008-06-12 Kyocera Corp 無線通信端末および通信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10191419A (ja) * 1996-12-27 1998-07-21 Matsushita Electric Ind Co Ltd 移動局装置
JP2006020270A (ja) * 2004-06-04 2006-01-19 Ntt Docomo Inc ハンドオーバー制御装置、無線リソース管理装置、ネットワークリソース管理装置、移動通信システム及びハンドオーバー制御方法
JP2008135939A (ja) * 2006-11-28 2008-06-12 Kyocera Corp 無線通信端末および通信方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012100106A (ja) * 2010-11-02 2012-05-24 Kyocera Corp 基地局装置およびハンドオーバ方法
KR20130142509A (ko) * 2012-06-19 2013-12-30 주식회사 케이티 서비스 제공 방법, 이를 지원하는 단말 및 서비스 제어 장치
KR101894588B1 (ko) * 2012-06-19 2018-09-03 주식회사 케이티 서비스 제공 방법, 이를 지원하는 단말 및 서비스 제어 장치
JPWO2020202381A1 (fr) * 2019-03-29 2020-10-08
JPWO2020202382A1 (fr) * 2019-03-29 2020-10-08
WO2020202382A1 (fr) * 2019-03-29 2020-10-08 本田技研工業株式会社 Dispositif terminal, système de communication, procédé de communication, et programme
CN113574933A (zh) * 2019-03-29 2021-10-29 本田技研工业株式会社 终端装置、通信系统、通信方法以及程序
JP7285918B2 (ja) 2019-03-29 2023-06-02 本田技研工業株式会社 端末装置、通信システム、通信方法、及びプログラム
CN113574933B (zh) * 2019-03-29 2023-12-12 本田技研工业株式会社 终端装置、通信系统、通信方法以及存储介质

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JP5361986B2 (ja) 2013-12-04

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