WO2012161511A2 - Procédé de recherche d'un lan ap sans fil destiné à un transfert intercellulaire vertical vers un lan sans fil dans un réseau de communication mobile et son appareil compact de balise électromagnétique d'une station de base de communication mobile - Google Patents

Procédé de recherche d'un lan ap sans fil destiné à un transfert intercellulaire vertical vers un lan sans fil dans un réseau de communication mobile et son appareil compact de balise électromagnétique d'une station de base de communication mobile Download PDF

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Publication number
WO2012161511A2
WO2012161511A2 PCT/KR2012/004068 KR2012004068W WO2012161511A2 WO 2012161511 A2 WO2012161511 A2 WO 2012161511A2 KR 2012004068 W KR2012004068 W KR 2012004068W WO 2012161511 A2 WO2012161511 A2 WO 2012161511A2
Authority
WO
WIPO (PCT)
Prior art keywords
mobile communication
wlan
base station
beacon
wireless lan
Prior art date
Application number
PCT/KR2012/004068
Other languages
English (en)
Korean (ko)
Other versions
WO2012161511A3 (fr
Inventor
김혜숙
Original Assignee
Kim Hye Sook
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 Kim Hye Sook filed Critical Kim Hye Sook
Publication of WO2012161511A2 publication Critical patent/WO2012161511A2/fr
Publication of WO2012161511A3 publication Critical patent/WO2012161511A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access 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
    • H04W36/0055—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
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology
    • 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]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • 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

  • the present invention relates to a method for minimizing terminal power consumption required for searching for a WLAN AP and minimizing quality of service due to handoff during a vertical handoff from a mobile communication network to a wireless LAN.
  • a mobile communication base station beacon transmitted by a small mobile communication base station beacon device having the same coverage as the wireless LAN AP the terminal does not directly search for a beacon signal of the wireless LAN AP, but through the conventional mobile communication neighbor base station discovery procedure available WLAN
  • the method of distributing traffic to the WLAN is expected to be the most effective method because the cost is lower and the capacity increase effect is higher than other methods, but the actual effect is due to the issue of vertical handoff from the mobile communication network to the WLAN. Is not meeting expectations.
  • the most issues in the vertical handoff from the mobile communication network to the WLAN are the WLAN access point (AP) discovery method and IP mobility management protocol.
  • DSMIP Dual Stack Mobile IP
  • PMIP Proxy Mobile IP
  • IP Flow Mobility there is no effective method for WLAN AP discovery yet. have.
  • a typical WLAN AP discovery method is for a terminal to always search for a WLAN AP.
  • this method has a disadvantage in that the battery consumption of the terminal is too high.
  • the most advanced form of the present method is to inform the terminal of density information of the WLAN AP through the mobile communication network and to allow the terminal to adjust the WLAN AP discovery period according to the density of the WLAN AP.
  • the WLAN AP can be relatively energy-efficient, but the radio resources are wasted to inform the UE AP density information, and it is difficult to discover the WLAN AP in an area where the WLAN AP density is low. There is this.
  • the present invention provides a WLAN AP discovery method for reducing terminal power consumption and minimizing quality degradation due to handoff delay in providing a vertical handoff function from a mobile communication network to a wireless LAN. There is a purpose.
  • an object of the present invention is to provide a small mobile communication base station beacon apparatus that can implement the above energy efficient WLAN AP discovery method at low cost.
  • the UE discovers the WLAN AP through the WLAN AP discovery procedure and performs a vertical handoff to the WLAN AP. al handoff).
  • the beacon channel may consist of only a pilot channel, a pilot channel and a synchronization channel, or a pilot channel, a synchronization channel and some control channels.
  • the specific cell identifier may be a Cell-ID transmitted through a PN offset or a synchronization channel.
  • the small mobile communication base station beacon device may be implemented as a device independent from the WLAN AP, or may be implemented as an integrated device with the WLAN AP and may share some modules with the WLAN AP.
  • the second step may further include determining that there is a WLAN AP available nearby when the signal strength corresponding to the specific cell identifier is greater than or equal to a threshold.
  • the terminal may recognize the specific cell identifier and prevent the handoff by not reporting the strength of the specific cell identifier or a signal corresponding thereto to the mobile communication base station. .
  • the third step may be characterized in that the mobile communication base station recognizes the specific cell identifier, thereby preventing the handoff by ignoring the specific cell identifier or the signal strength corresponding thereto.
  • the small mobile communication base station beacon apparatus transmits control information for preventing handoff
  • the terminal transmits the control information.
  • it may be characterized in that no handoff is attempted to the small mobile base station beacon apparatus.
  • the terminal reports a specific cell identifier and a corresponding signal strength to a mobile communication base station through a mobile communication neighbor cell search procedure, and if the signal strength of the mobile communication base station is greater than or equal to a predetermined threshold, The method may further include reporting to a vertical handoff control server.
  • the fourth step may include a vertical transmission to the WLAN AP when the terminal receives a message for detecting the WLAN AP corresponding to the specific cell identifier from the vertical control server. Handoff may be performed.
  • a small mobile communication base station beacon apparatus for WLAN AP discovery for vertical handoff from a mobile communication network includes a specific cell identifier assigned for WLAN AP discovery.
  • a digital signal processing unit for generating a digital signal, and converts the digital signal of the digital signal processing unit into an analog signal, and then to a transmission frequency, amplified to a predetermined signal strength and the coverage corresponding to the coverage of the corresponding WLAN AP through the antenna
  • a control unit for controlling the digital signal processor and the beacon transmitter and providing a timing and frequency reference signal.
  • the apparatus may further include a plurality of digital signal processing units supporting a plurality of different mobile communication technologies, and may further include a plurality of beacon transmitters supporting different frequency assignments or frequency bands.
  • the digital signal processing unit and the beacon transmitter may support a method of continuously transmitting a beacon signal or a method of transmitting at a predetermined interval.
  • the terminal may further include a synchronization receiving unit configured of any one of a GPS reception module, a base station forward channel reception module, and an IEEE 1588 synchronization reception module. .
  • the present invention it is possible to determine the existence of the WLAN AP through the conventional neighbor base station discovery procedure in the mobile communication network to prevent the waste of radio resources compared to the conventional WLAN AP discovery method, and stable vertical hand to the WLAN AP By performing the off, it is possible to minimize the power consumption of the terminal and at the same time prevent the handoff delay to provide a high quality service.
  • the present invention provides an energy efficient WLAN AP discovery method for the vertical handoff from the mobile communication network to the wireless LAN to maximize the traffic distribution effect of the mobile communication network through the WLAN.
  • FIG. 1 is a diagram illustrating a network structure to which a small mobile communication base station beacon apparatus according to the present invention is applied.
  • FIG. 2 is a flowchart illustrating a case where a terminal independently discovers a WLAN AP according to the present invention.
  • 3 is a procedure of a method for notifying a terminal by determining whether or not a vertical handoff from a mobile communication network to a WLAN AP.
  • FIG. 4 is a block diagram of a small mobile communication base station beacon device according to the present invention.
  • FIG. 5 is a block diagram of a small mobile communication base station beacon device supporting a plurality of mobile communication technologies according to the present invention.
  • the present invention instead of directly searching for the beacon signal of the WLAN AP through the mobile communication base station beacon transmitted by the small mobile communication base station beacon apparatus having the same coverage as the WLAN AP (Access Point) It is possible to accurately detect available WLAN APs through a conventional mobile communication neighbor base station discovery procedure, thereby minimizing terminal power consumption required for WLAN AP discovery during vertical handoff from the mobile communication network to the WLAN and quality of service due to handoff. Provided are a method for minimizing degradation and a small mobile communication base station beacon device therefor.
  • reference numerals 101 and 102 denote coverages of a mobile communication base station and a mobile communication base station, respectively
  • reference numerals 103 and 104 denote coverages of a WLAN AP and a WLAN AP, respectively.
  • Reference numerals 105 and 106 denote small mobile communication base station beacon apparatuses and their coverage according to the present invention
  • reference numeral 107 denotes a mobile communication terminal.
  • the small mobile communication base station beacon device 105 is designed to have almost the same coverage as the WLAN AP 103 and transmits to the corresponding beacon channel according to the applied mobile communication technology. In this case, a specific cell identifier allocated for WLAN AP discovery is transmitted through the beacon channel.
  • the small mobile communication base station beacon device 105 transmits a PN offset (PN_Offset) to a specific cell identifier allocated for WLAN AP discovery through a pilot channel.
  • PN_Offset PN offset
  • the Cell-ID is transmitted to a specific cell identifier allocated for WLAN AP discovery through a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH).
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the beacon channel of the small mobile communication base station beacon apparatus 105 may include a cell common control channel for transmitting cell configuration information.
  • the beacon channel of the small mobile communication base station beacon device 105 for UMTS additionally includes a primary common control physical channel (PCCPCH), so that the terminal is a small mobile communication base station beacon device 105 during a typical neighboring base station discovery procedure. ) May be sent to prevent the base station from attempting a handoff by mistaken).
  • PCCPCH primary common control physical channel
  • the small mobile communication base station beacon device 105 may be implemented as a single device integrated with the wireless LAN AP 103 or may be implemented as a separate device from the wireless LAN AP 103. It is installed in the same position as the WLAN AP (103).
  • the neighbor base station list information of the mobile communication base station 101 is included in the small base station beacon for the WLAN AP search so that the terminal can quickly detect the small mobile communication base station beacon device 105 in a typical neighbor base station search procedure.
  • the specific cell identifier assigned to the device 105 is included.
  • reference numeral s201 denotes a typical mobile communication neighbor cell search procedure of the terminal.
  • the terminal detects the specific cell identifier transmitted by the small mobile base station beacon apparatus through this procedure.
  • the specific cell identifier allocated for WLAN AP discovery is detected (s202)
  • the WLAN AP discovery and WLAN access procedure is performed (s203).
  • the terminal may determine that there is a WLAN AP available nearby, and perform the WLAN AP discovery and WLAN access procedure (S203).
  • the terminal performs a vertical handoff from the mobile communication network to the WLAN (S205).
  • the terminal reports the cell identifier and signal strength of the neighbor cell that satisfies a specific condition to the mobile communication base station, and the base station determines whether to handoff between base stations based on this. Since the small mobile communication base station beacon device corresponding to the specific cell identifier has only a beacon channel, not a normal mobile communication base station capable of processing traffic, a method of preventing handoff to the small mobile communication base station beacon device This is necessary.
  • the present invention provides the following three methods as a solution to this.
  • the cell identifier and signal strength of the small mobile communication base station beacon device may be ignored without being transmitted to the mobile communication base station.
  • the signal strength of the small mobile base station beacon in the mobile base station call processing software can be ignored.
  • the small mobile base station beacon apparatus may transmit control information for preventing vertical handoff to itself. For example, in the case of a small mobile communication base station beacon device for UMTS, a handoff attempt may be prevented to itself through a normal cell indicator (NCI) through a PCCCH.
  • NCI normal cell indicator
  • FIG. 3 is a flowchart illustrating a method of notifying a terminal by determining whether a vertical handoff is performed from a mobile communication network to a WLAN AP.
  • the terminal 107 reports the neighbor base station discovery information including the cell identifier of the neighbor cell satisfying the condition during the mobile communication neighbor cell search procedure and the corresponding signal strength information to the mobile communication base station 101, and the mobile communication base station 101. 101 determines whether to handoff by analyzing this (S301).
  • the specific cell identifier allocated for the discovery of the WLAN AP in the neighbor base station discovery information reported by the terminal 107 is included.
  • the mobile communication base station 101 receives it from the terminal 107 and transmits it to the vertical handoff control server 301 (S302).
  • the vertical handoff control server 301 reports the reported signal strength, user profile, and operator. It is determined whether the vertical handoff is performed to the WLAN AP based on the policy, and when it is determined that the vertical handoff needs to be performed, a handoff instruction message is sent to the terminal 107 (S303).
  • the terminal 107 receives this message from the vertical handoff control server 301, the terminal 107 performs a vertical handoff procedure to the WLAN AP.
  • the mobile communication base station 101 when the signal strength corresponding to the specific cell identifier is greater than or equal to a predetermined threshold, the mobile communication base station 101 includes information on the specific cell identifier in the neighbor base station discovery information. Can be set to send.
  • the small mobile communication base station beacon apparatus 400 includes a controller 401, a digital signal processor 402, a beacon transmitter 403 including a D / A and frequency converter 406 and a power amplifier 407, and the like. It consists of.
  • the small mobile communication base station beacon device is applied to a mobile communication technology (e.g., synchronous CDMA, TDD technology, etc.) that requires synchronization between base stations in a typical mobile communication neighbor cell search procedure or mobile communication neighbor cell search performance. It may be configured to further include a synchronization receiver 405 if necessary to improve.
  • the synchronization receiver 405 may be implemented by one of a GPS receiver, a mobile communication terminal receiving module, and an IEEE 1588 synchronous reception LAN interface.
  • the digital signal processor 402 generates a beacon channel digital signal data including a specific cell identifier assigned for the WLAN AP discovery beacon transmitter To the D / A and frequency converter 406 of 403.
  • the D / A and frequency converter 406 converts the digital signal data from the digital signal processing unit 402 into an analog signal, converts it into a transmission frequency band, and transfers the signal to the power amplifier 407.
  • the power amplifier 407 amplifies the transmission band analog signal from the D / A and frequency converter 406 to an appropriate output level and transmits it through the transmission antenna 404.
  • the controller 401 controls the operations of the digital signal processor 402 and the beacon transmitter 403 and provides timing and frequency references thereto.
  • the digital signal processing unit 402 of the small mobile communication base station beacon device 400 is generally implemented as an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), but a simple memory or shift register. It may be implemented in memory.
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • the beacon channel digital signal data generated through the digital signal processing in advance is stored in the memory or the shift register.
  • the stored signal data is transferred to the D / A converter under the control of the controller 401.
  • the synchronization receiver 405 since the synchronization receiver 405 has technical limitations for each implementation method, it is necessary to mix these methods appropriately.
  • the installation location of the small mobile communication base station beacon device is limited, and in some cases, a GPS antenna and an additional cable need to be installed.
  • the initial timing acquisition time is long in an in-building environment where the GPS signal is weak. Therefore, it is desirable to apply the GPS receiver to shaded areas such as islands or areas where mobile communication base station signals are weak and difficult to establish a wired infrastructure.
  • a timing server In case of utilizing the IEEE 1588 technology, a timing server must be provided in the wired IP network, and in particular, all routers and switch devices in the WAN section between the timing server and the small mobile base station beacon device must be upgraded to support IEEE 1588. . Therefore, it is desirable to apply the IEEE 1588 technology when the wired infrastructure supports IEEE 1588.
  • the small mobile base station beacon apparatus may have a plurality of digital signal processing units (502-1 ⁇ 502-k) to support a plurality of mobile communication technologies, a plurality of FA (Frequency Assignment) or a plurality It may have a plurality of beacon transmitters (503-1 ⁇ 503-k) to support the number of bands.
  • the digital signal data of the beacon channel generated by each digital signal processor is transferred to the plurality of beacon transmitters, converted into analog signals, converted into transmission frequency bands, and then amplified to an appropriate signal strength. Thereafter, they are combined via signal combiner 508 and then sent out via transmit antenna 504.

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

Abstract

La présente invention concerne un procédé permettant de détecter précisément un point d'accès d'un réseau local (LAN AP) sans fil disponible grâce à une procédure typique de recherche d'une station de base de communication mobile adjacente, la procédure utilisant une balise électromagnétique d'une station de base de communication mobile qui transmet un signal provenant d'un appareil compact de balise électromagnétique d'une station de base de communication mobile possédant une couverture identique à celle d'un LAN AP sans fil, au lieu d'un terminal qui recherche directement un signal d'une balise électromagnétique d'un LAN AP sans fil. L'invention concerne également un appareil compact de balise électromagnétique d'une station de base de communication mobile pour le procédé. Selon la présente invention, l'existence du LAN AP sans fil peut être déterminée grâce à la procédure de recherche d'une station de base adjacente dans un réseau de communication mobile, empêchant ainsi la perte de ressources sans fil par rapport aux procédés conventionnels de recherche d'un LAN AP sans fil. En outre, selon la présente invention, un transfert intercellulaire vertical vers un LAN AP sans fil peut être effectué de manière stable, minimisant ainsi la consommation d'énergie dans un terminal et empêchant également un retard de transfert intercellulaire, ce qui permet de fournir un service de haute qualité.
PCT/KR2012/004068 2011-05-23 2012-05-23 Procédé de recherche d'un lan ap sans fil destiné à un transfert intercellulaire vertical vers un lan sans fil dans un réseau de communication mobile et son appareil compact de balise électromagnétique d'une station de base de communication mobile WO2012161511A2 (fr)

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Application Number Priority Date Filing Date Title
KR10-2011-0048721 2011-05-23
KR1020110048721A KR101105646B1 (ko) 2011-05-23 2011-05-23 이동통신망에서 무선랜으로의 버티컬 핸드오프를 위한 무선랜 ａｐ 탐색 방법 및 이를 위한 소형 이동통신 기지국 비콘장치

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WO2012161511A2 true WO2012161511A2 (fr) 2012-11-29
WO2012161511A3 WO2012161511A3 (fr) 2013-03-21

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KR101431473B1 (ko) 2012-07-10 2014-08-20 주식회사 케이티 기지국―ａｐ 커버리지 기반의 와이파이 오프로딩율 제공을 위한 방법
KR102297934B1 (ko) * 2015-03-27 2021-09-06 주식회사 케이티 단말 장치 및 이에 의한 무선 통신 연결 방법，및 비콘 장치 및 이에 의한 ａｐ 정보의 제공 방법

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