WO2011070875A1 - Systeme de communication sans fil, terminal mobile, et procede de recherche cellulaire - Google Patents

Systeme de communication sans fil, terminal mobile, et procede de recherche cellulaire Download PDF

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Publication number
WO2011070875A1
WO2011070875A1 PCT/JP2010/069491 JP2010069491W WO2011070875A1 WO 2011070875 A1 WO2011070875 A1 WO 2011070875A1 JP 2010069491 W JP2010069491 W JP 2010069491W WO 2011070875 A1 WO2011070875 A1 WO 2011070875A1
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WO
WIPO (PCT)
Prior art keywords
cell
base station
macro
mobile terminal
search
Prior art date
Application number
PCT/JP2010/069491
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English (en)
Japanese (ja)
Inventor
哲也 都木
Original Assignee
日本電気株式会社
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 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2011545150A priority Critical patent/JP5726756B2/ja
Priority to US13/513,901 priority patent/US8965381B2/en
Priority to CN201080055270.2A priority patent/CN102648648B/zh
Priority to EP10835797.1A priority patent/EP2512178A4/fr
Publication of WO2011070875A1 publication Critical patent/WO2011070875A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a radio communication system including a femto cell, a mobile terminal, and a cell search method.
  • the main installation location of the small base station forming the femtocell is a general residence, and the main purpose is to provide services to the residents of the residence.
  • the femtocell and the macrocell are operated differently.
  • the macro cell is operated without including femto cell information as neighboring cell information.
  • the mobile terminal needs to perform location registration again in the femto cell after transitioning to the out-of-service state. Therefore, for example, when the user is in a call, there is a problem that impairs the convenience of the user, such as the call being interrupted when moving from the macro cell to the femto cell.
  • an object of the present invention is to provide a wireless communication system, a mobile terminal, and a mobile terminal that can smoothly move between cells without causing the mobile terminal to transition to an out-of-service state even when moving from a macro cell to a femto cell. And providing a cell search method.
  • the mobile terminal of the present invention includes a macro base station that forms a macro cell or a mobile terminal that communicates with a femto base station that forms a femto cell.
  • Macro cell search means for searching for a communicable macro base station, cell ID detection means for receiving broadcast information from the macro base station searched by the macro cell search means and detecting a cell ID of the macro base station, and the macro Cell ID information storage means for storing the cell ID of the base station, and cell ID comparison means for comparing the cell ID stored in the cell ID information storage means with the cell ID detected by the cell ID detection means.
  • the macro cell search means Search for a base station, cause the cell ID detection means to detect the cell ID, store the detected cell ID in the cell ID information storage means, and each time the portable terminal moves between cells, the macro cell A search means for searching the macro base station; a cell ID detection means for detecting the cell ID; a control means for causing the cell ID comparison means to compare the cell ID; and a storage means for storing the cell ID.
  • Femto cell search means for performing a cell search of the femto base station based on a comparison result between the detected cell ID and the detected cell ID.
  • the wireless communication system of the present invention includes a mobile terminal that communicates with a macro base station that forms a macro cell or a femto base station that forms a femto cell, and the mobile terminal can communicate with the macro base with which the mobile terminal can communicate.
  • Macro cell search means for searching for a station, cell ID detection means for receiving broadcast information from the macro base station searched by the macro cell search means and detecting a cell ID of the macro base station, and the cell of the macro base station
  • a cell ID information storage means for storing an ID
  • a cell ID comparison means for comparing the cell ID stored in the cell ID information storage means with a cell ID detected by the cell ID detection means; and When the reception quality from the femto base station in the area is less than a predetermined threshold, the macro base station is connected to the macro cell search means.
  • the cell search method of the present invention has a reception quality from a femto base station in which a mobile terminal that communicates with a macro base station that forms a macro cell or a femto base station that forms a femto cell is less than a predetermined threshold.
  • the mobile terminal searches for a macro base station with which the mobile terminal can communicate, receives broadcast information from the searched macro base station, detects a cell ID of the macro base station, and stores the detected cell ID
  • the mobile terminal searches for a macro base station with which the mobile terminal can communicate, and is stored with the cell ID detected from the broadcast information received from the searched macro base station.
  • the cell ID is compared, and a cell search of the femto base station is performed based on a comparison result between the stored cell ID and the detected cell ID.
  • the broadcast information is received from the surrounding macrocell, and the cell ID of the macrocell is detected from the broadcast information that can be received at that time.
  • the detected cell ID is stored in the cell ID information storage means.
  • the broadcast information from a surrounding macro cell is received, the cell ID of a macro cell is detected, the cell ID memorize
  • 1 is a block diagram illustrating a wireless communication system according to a first embodiment of the present invention. It is a block diagram which shows the structure of the portable terminal in the radio
  • FIG. 1 is a block diagram illustrating a wireless communication system according to a first embodiment of this invention.
  • a macro base station forming a macro cell of a base station 102, a base station 104, and a base station 106, and a femto A small cell base station (femto base station forming a femto cell) 110 is provided.
  • the base station 102 covers the macro cell 103.
  • Base station 104 covers macro cell 105.
  • Base station 106 covers macro cell 107.
  • a small base station 110 for femtocells is installed in a residence 108 and covers a small area femtocell 109 in the vicinity of the residence 108.
  • a wireless communication system including three base stations, that is, a base station 102, a base station 104, and a base station 106, and one small base station 110 for a femto cell is illustrated.
  • An example is given.
  • the wireless communication system is further provided with a plurality of base stations and small base stations for femtocells.
  • base station 102, base station 104, and base station 106 are assigned different cell IDs (identifiers).
  • the broadcast information broadcast from each of the base station 102, the base station 104, and the base station 106 includes each cell ID.
  • the mobile terminal 101 performs voice and data communication with the base station 102, the base station 104, and the base station 106 in which the mobile terminal 101 is located.
  • the mobile terminal 101 When the mobile terminal 101 is located in the femtocell 109, the mobile terminal 101 performs voice and data communication with the femtocell small base station 110 wirelessly.
  • the user of the mobile terminal 101 lives in the residence 108.
  • FIG. 2 is a block diagram showing a configuration of the mobile terminal 101.
  • the mobile terminal 101 includes a communication unit 201 and a control unit 202.
  • the communication unit 201 wirelessly communicates voice and data with the base station.
  • the communication unit 201 performs a cell search to search for a base station with which the mobile terminal 101 can communicate, receives the broadcast information from the base station, and receives a cell ID included in the received broadcast information.
  • a cell ID detection function unit 252 for detection.
  • the control unit 202 controls each unit in the mobile terminal 101. Further, the control unit 202 has a cell ID comparison function unit 254.
  • the mobile terminal 101 has a cell ID information storage unit 253.
  • the control unit 202 also registers cell ID information in the cell ID information storage unit 253 and reads cell ID information from the cell ID information storage unit 253.
  • 3A to 3D are explanatory diagrams of processing at each position when the mobile terminal 101 moves.
  • 4A and 4B are diagrams illustrating information stored in the cell ID information storage unit 253.
  • FIG. 3A when the mobile terminal 101 is in a position L1 (a position within the macro cell 103 and the femto cell 109 and out of the macro cell 105 and the macro cell 107) in the vicinity of the residence 108, the mobile terminal 101 It resides in the femtocell 109 and communicates with the small base station 110 for the femtocell. In the initial state, cell ID information is not stored in cell ID information storage unit 253 of portable terminal 101 as shown in FIG. 4A.
  • the reception quality of the signal received by the mobile terminal 101 from the femtocell 109 deteriorates. Therefore, when the mobile terminal 101 moves to a position L2 (a position outside the femtocell 109 and within the macrocell 103, the macrocell 105, and the macrocell 107) at the boundary of the femtocell 109, the reception quality is improved. Less than a predetermined threshold that can be performed. When the reception quality from the femtocell 109 becomes less than a predetermined threshold, the cell search function unit 251 of the mobile terminal 101 performs a cell search.
  • the mobile terminal 101 When the mobile terminal 101 is present at the position L2, the mobile terminal 101 performs a cell search to detect the macro cell 103, the macro cell 105, and the macro cell 107. Among the macro cell 103, the macro cell 105, and the macro cell 107, the reception quality Performs location registration in the best macro cell.
  • the mobile terminal 101 moves between cells after storing the cell ID in the cell ID information storage unit 253, the mobile terminal 101 stores the cell ID stored in the cell ID information storage unit 253 every time it moves between cells. And the received cell ID are compared, and processing for confirming cell ID match or mismatch is performed.
  • the mobile terminal 101 determines that the cell ID stored in the cell ID information storage unit 253 and the received cell ID completely match, the mobile terminal 101 performs a cell search for the femtocell 109.
  • the mobile terminal 101 has moved to a position L3 away from the femtocell 109 (a position within the macrocell 107 and out of the macrocell 103, macrocell 105, and femtocell 109). .
  • the mobile terminal 101 When the mobile terminal 101 confirms that the cell ID stored in the cell ID information storage unit 253 completely matches the received cell ID, the mobile terminal 101 performs a cell search process of the femtocell 109. When the femtocell 109 having sufficient communication quality is detected as a result of the cell search, the mobile terminal 101 performs inter-cell movement processing on the femtocell 109 and registers the position in the femtocell 109.
  • the mobile terminal 101 when the mobile terminal 101 approaches the vicinity of the femtocell 109, a cell search for the femtocell 109 is performed. Accordingly, thereafter, the mobile terminal 101 can be smoothly moved to the femtocell 109 without being changed to the out-of-service state.
  • a condition that the cell ID information stored in the cell ID information storage unit 253 and the received cell ID completely match is set in advance as a cell search condition, and the cell search condition is cleared.
  • cell search conditions are not limited to these conditions.
  • the cell search condition as described above, the cell IDs of the macro cell 103, the macro cell 105, and the macro cell 107 completely coincide with the cell IDs stored in the cell ID information storage unit 253 in the mobile terminal 101.
  • the received cell ID may match even a part of the cell ID stored in the cell ID information storage unit 253.
  • an arbitrary condition may be set as the cell search condition according to the power consumption performance of the mobile terminal 101.
  • the small base station 110 forming the femtocell 109 to be searched is installed in the user's residence 108, and information such as a base station identification code such as a frequency and a scrambling code necessary for the cell search is provided. I know it. Therefore, these pieces of information may be held in the mobile terminal 101 in advance. Alternatively, a menu may be provided in the mobile terminal 101 so that information relating to a cell to be searched can be edited through a user operation so that a specific cell can be set as a search target. For this reason, even if the femto cell information is not registered in the neighboring cell information of the macro cell, the cell search of the femto cell can be activated from the cell ID.
  • FIG. 5 is a flowchart used for explaining the operation of the wireless communication system according to the first embodiment of the present invention.
  • the cell search function unit 251 of the mobile terminal 101 measures the reception quality of the femto cell (step S101).
  • the cell search function unit 251 determines whether or not the reception quality is equal to or higher than a threshold value (step S102).
  • the process returns to step S101, and the cell search function unit 251 measures the reception quality of the femtocell again.
  • the cell search function unit 251 determines that the reception quality is less than the threshold (step S102: NO)
  • the cell search function unit 251 performs a cell search for the macro cell (step S103).
  • the cell search function unit 251 determines whether or not at least one of the detected macro cells has a reception quality equal to or higher than a threshold value as a result of the cell search (step S104). If the cell search function unit 251 determines that all the detected macro cells do not have a reception quality equal to or higher than the threshold (step S104: NO), the process returns to step S103, and the cell search function unit 251 again performs the macro cell. Perform a cell search. On the other hand, when the cell search function unit 251 determines that at least one of the detected macro cells has a reception quality equal to or higher than the threshold (step S104: YES), the cell search function unit 251 Location registration is performed for the one having the highest reception quality (step S105).
  • the cell ID detection function unit 252 receives a cell ID from each of the detected macro cells, and sends the cell ID of the received macro cell to the control unit 202, and the control unit 202 carries the sent cell ID.
  • the data is stored in the cell ID information storage unit 253 provided in the terminal 101 (step S106).
  • the cell search function unit 251 performs cell search to search for a macro cell.
  • the cell ID detection function unit 252 receives a cell ID from the searched macro cell.
  • the cell ID comparison function unit 254 collates cell IDs. That is, the cell ID comparison function unit 254 checks whether or not the cell ID stored in the cell ID information storage unit 253 matches the cell ID received by the cell ID detection function unit 252 (step S108). .
  • step S109 NO
  • the process returns to step S107, and the cell search function unit 251, the cell ID detection function unit 252, and the cell ID comparison function unit 254 again search for a macro cell, receive a cell ID, and collate, respectively. Do.
  • the cell ID comparison function unit 254 determines that the cell ID stored in the cell ID information storage unit 253 matches the cell ID received by the cell ID detection function unit 252 (step S109: YES)
  • the cell ID comparison The functional unit 254 collates the received cell ID with the cell search condition, and confirms whether the received cell ID matches the cell search condition (step S110).
  • the cell search condition indicates a condition for performing the cell search of the femto cell. For example, the condition that the cell ID information stored in the cell ID information storage unit 253 and the received cell ID completely match, or the received cell ID is at least one of the cell ID information stored in the cell ID information storage unit 253.
  • the cell search condition includes a condition that the data matches the part.
  • step S111 If the received cell ID does not match the cell search condition (step S111: NO), the process returns to step S107, and a macro cell search, cell ID reception, and verification are performed again.
  • step S111: YES in the example of FIGS. 3A to 3D described above, the three cell IDs of the macro cell 103, the macro cell 105, and the macro cell 107 are complete.
  • the cell search function unit 251 adds a cell search for the femto cell in addition to the macro cell neighboring cell search. Thereby, the cell search function unit 251 performs a cell search for the femto cell (step S112).
  • the cell search function unit 251 determines whether or not the reception quality of the femto cell is equal to or higher than a threshold (step S113).
  • the process returns to step S112, and the cell search function unit 251 performs the femto cell search again.
  • the cell search function unit 251 determines that the reception quality of the femto cell is equal to or higher than the threshold (step S113: YES)
  • the cell search function unit 251 performs location registration in the femto cell (step S114).
  • the mobile terminal 101 determines whether or not an instruction to end the process is given through a user operation or the like (step S115).
  • step S115: NO the process returns to step S101, and the cell search function unit 251 performs the measurement of the reception quality of the femtocell.
  • step S115: YES the process ends.
  • the mobile terminal 101 When the cell ID stored in the cell ID information storage unit 253 matches the received cell ID, the mobile terminal 101 performs a search for the femtocell 109. As described above, the mobile terminal 101 can move to the femtocell without causing the mobile terminal 101 to transition to the out-of-service state.
  • the second embodiment of the present invention is basically the same as the first embodiment, but as a femtocell detection method, IEEE 802.15.1 (Bluetooth (registered trademark)), which is a representative of near field communication, is used. ) Is used. Thereby, the present invention can also be applied when improving the power consumption performance of the portable terminal.
  • IEEE 802.15.1 Bluetooth (registered trademark)
  • IEEE 802.15.1 Bluetooth (registered trademark)
  • Bluetooth registered trademark
  • the short-range communication is activated only when the cell ID is matched and the cell IDs match each other by detecting the cell ID and checking whether the cell IDs match or do not match.
  • the cell search function unit 251 performs femtocell cell search using near field communication in step S112 of FIG. By doing so, it is not necessary to always activate short-range communication, and the above-described problem of degrading the power consumption performance of the mobile terminal can be prevented.
  • the above-described portable terminal 101 has a computer system inside.
  • the operation of each processing unit described above is stored in a computer-readable recording medium in the form of a program.
  • the computer reads and executes this program, and the above-described processing is performed.
  • the computer-readable recording medium includes a magnetic disk, a magneto-optical disk, a CD (Compact Disc) -ROM (Read Only Memory), a DVD (Digital Versatile Disc) -ROM, a semiconductor memory, and the like.
  • the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.
  • the program may be for realizing a part of the above-described functions. Furthermore, what can implement
  • the present invention can be used in, for example, a wireless communication system including a femtocell. According to the present invention, it is possible to move to a femtocell without causing the mobile terminal to transition to the out-of-service state. As a result, even if the user moves from the macro cell to the femto cell during communication using the mobile terminal, for example, communication is not interrupted, and good communication can be maintained.
  • control unit control means 251 ... cell search function unit ( Macro cell search means, femto cell search means) 252 ... Cell ID detection function section (cell ID detection means) 253 ... Cell ID information storage section (cell ID information storage means) 254 ... Cell ID comparison function section (cell ID comparison means)

Abstract

L'invention concerne un système de communication sans fil qui permet le transfert en douceur d'un terminal mobile entre des cellules sans que le terminal mobile transite hors de la couverture, même lors du transfert d'une macrocellule à une femtocellule. Un terminal mobile est pourvu: d'un moyen de recherche de macrocellules qui recherche une macro-station de base pouvant communiquer avec le terminal mobile, qui communique avec des macro-stations de base formant des macrocellules et des femto-stations de base qui forment des femtocellules; un moyen de détection d'ID de cellules qui reçoit des informations diffusées à partir de la macro-station de base trouvée par les moyens de recherche de macrocellules, et détecte l'ID de cellules de la macro-station de base; un moyen de stockage d'informations d'ID de cellules qui permet de stocker les ID de cellules de la macro-station de base; un moyen de comparaison des ID de cellules qui permet de comparer les ID de cellules stockées par le moyen de stockage d'informations des ID de cellules et des ID de cellules détectées par le moyen de détection d'ID cellulaire; un moyen de commande qui amène le moyen de recherche de macrocellule à rechercher la macro-station de base lorsque la qualité de réception de la femto-station de base qui couvre le terminal mobile n'atteint pas un seuil prédéterminé, amène le moyen de détection des ID de cellules à détecter les ID de cellules, stocke les ID de cellules détectées dans le moyen de stockage d'informations d'ID de cellules, et chaque fois que le terminal mobile change la cellule, amène le moyen de détection d'ID de cellules à détecter les ID de cdellules, et amène le moyen de comparaison d'ID de cellules à comparer les ID de cellules; et un moyen de recherche de femtocellules qui recherche des cellules pour la femto-station de base sur la base des résultats de la comparaison des ID de cellules stockées par le moyen de stockage d'informations d'ID de cellules et des ID de cellules détectées.
PCT/JP2010/069491 2009-12-07 2010-11-02 Systeme de communication sans fil, terminal mobile, et procede de recherche cellulaire WO2011070875A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2011545150A JP5726756B2 (ja) 2009-12-07 2010-11-02 無線通信システム、携帯端末、及びセルサーチ方法
US13/513,901 US8965381B2 (en) 2009-12-07 2010-11-02 Wireless communication system, mobile terminal, and cell search method
CN201080055270.2A CN102648648B (zh) 2009-12-07 2010-11-02 无线通信系统、便携终端、以及小区搜索方法
EP10835797.1A EP2512178A4 (fr) 2009-12-07 2010-11-02 Systeme de communication sans fil, terminal mobile, et procede de recherche cellulaire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-277557 2009-12-07
JP2009277557 2009-12-07

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WO2011070875A1 true WO2011070875A1 (fr) 2011-06-16

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US (1) US8965381B2 (fr)
EP (1) EP2512178A4 (fr)
JP (1) JP5726756B2 (fr)
CN (1) CN102648648B (fr)
WO (1) WO2011070875A1 (fr)

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See also references of EP2512178A4

Also Published As

Publication number Publication date
JP5726756B2 (ja) 2015-06-03
CN102648648A (zh) 2012-08-22
CN102648648B (zh) 2015-09-30
EP2512178A4 (fr) 2016-11-09
US8965381B2 (en) 2015-02-24
US20120244867A1 (en) 2012-09-27
EP2512178A1 (fr) 2012-10-17
JPWO2011070875A1 (ja) 2013-04-22

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