WO2011126186A1 - Procédé de commande de configuration de connexions par station de base femto et procédé de configuration de connexion par terminal - Google Patents

Procédé de commande de configuration de connexions par station de base femto et procédé de configuration de connexion par terminal Download PDF

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Publication number
WO2011126186A1
WO2011126186A1 PCT/KR2010/006595 KR2010006595W WO2011126186A1 WO 2011126186 A1 WO2011126186 A1 WO 2011126186A1 KR 2010006595 W KR2010006595 W KR 2010006595W WO 2011126186 A1 WO2011126186 A1 WO 2011126186A1
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WO
WIPO (PCT)
Prior art keywords
terminal
rat
femto
neighbor
bss
Prior art date
Application number
PCT/KR2010/006595
Other languages
English (en)
Inventor
Jaewon Lim
Original Assignee
Lg Electronics Inc.
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 KR1020100048761A external-priority patent/KR101637587B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to US13/639,352 priority Critical patent/US9179375B2/en
Publication of WO2011126186A1 publication Critical patent/WO2011126186A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • 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
    • H04W36/008357—Determination of target cell based on access point [AP] properties, e.g. AP service capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to a mobile communication system and, more particularly, to a femto base station in a mobile communication system.
  • 2 nd mobile communication refers to transmission and reception of voice through mobile communication, which includes CMDA, GSM, and the like.
  • GPRS advancing from the GSM, has been proposed to provide a packet switched data service based on the GSM system.
  • 3 rd generation mobile communication allows for transmission and reception of image and data, as well as voice
  • 3GPP Third Generation Partnership Project
  • IMT-2000 mobile communication system
  • RAT radio access technology
  • UTRAN Universal Mobile Telecommunication System
  • UTRAN Universal Mobile Telecommunication System
  • 3 rd generation mobile communication is evolving to 4th mobile communication.
  • the 4 th mobile communication technique includes a long-term evolution network (LTE) technique under standardization by 3GPP and an IEEE 802.16 technique under standardization by IEEE.
  • LTE uses a term of E-UTRAN (Evolved-UTRAN).
  • the 4 th mobile communication technique has introduced OFDM (Orthogonal Frequency Division Multiplexing)/OFDMA (Orthogonal Frequency Division Multiple Access).
  • OFDM uses a plurality of orthogonal subcarriers.
  • OFDM uses orthogonality between IFFT (Inverse Fast Fourier Transform0 and FFT (Fast Fourier Transform).
  • IFFT Inverse Fast Fourier Transform0 and FFT (Fast Fourier Transform).
  • a transmitter performs IFFT on data and then transmits the same.
  • a receiver performs FFT on received signal to restore the original data.
  • the transmitter uses IFFT in order to combine a plurality of subcarriers and the receiver uses corresponding FFT in order to split the multiple subcarriers.
  • Femto cell refers to provision of a small-scale radio environment by installing a base station using small power in indoor spaces such as homes, offices, and the like.
  • the femto cell is expected to improve an indoor service available area and increase capacity to thus enhance quality of service (QoS), and also expected to completely settle the next generation mobile communication system by providing data services.
  • QoS quality of service
  • FIGS. 1 and 2 Various structures as illustrated in FIGS. 1 and 2 have been proposed in order to implement such a femto cell in the existing mobile communication network.
  • FIG. 1 illustrates an example of a network structure based on femto cells according to the related art.
  • M-BS macro base station
  • f-BSs femto base stations
  • the f-BSs are connected with a femto cell network controller (FNC) through the Internet so as to be under the control of the FNC, and provide services to users.
  • FNC femto cell network controller
  • a terminal measures signals of neighboring cells and delivers the measured signal values to its f-BS, and the f-BS recognizes and administers the presence of neighboring cells based on the received signal values. Also, the f-BSs exchange information through a direct link or an indirect link through the FNC.
  • the f-BSs and the M-BS transmit and receive information through the FNC, an RNC (Radio Network Controller) or through an MME (Mobility Management Entity) that controls the f-BSs in a mobile communication network.
  • FIG. 2 illustrates another example of a femto cell-based network structure according to the related art.
  • f-BSs exchange information through a direct link or an MME, unlike the case illustrated in FIG. 1. Also, the M-BS and the f-BSs exchange through MMEs.
  • the FMC technique provides a cellular-based radio access technology (RAT), for example, a CDMA, TDMA, IMT-2000 (e.g., CDMA2000, W-CDMA), and LTE-based access scheme and a unlicensed frequency -based radio access technology (RAT) (e.g., Unlicensed Mobile Access , Bluetooth or Wi-Fi) to a terminal.
  • RAT cellular-based radio access technology
  • the terminal must support a dual-mode.
  • the dual-mode terminal when the dual-mode terminal comes close to a unlicensed frequency-based radio base station, the dual-mode terminal is allowed to use the same service as that in a cellular-based RAT through the unlicensed frequency-based RAT.
  • the dual-mode terminal enters an area of a small radio base station using the unlicensed frequency-based RAT while it is communicating with the cellular mobile communication base station (i.e., the M-BS), it performs handover according to the unlicensed frequency-based RAT of the small radio base station to continue communication of high band seamlessly.
  • the dual-mode terminal is able to perform seamless handover between the cellular-based RAT and the unlicensed frequency-based RAT.
  • FIG. 3 illustrates an example of combining the femto base station and the FMC technique.
  • the M-BS 30 is a general BS, but in this case, because the size of its cell radius is larger than the f-BS, the general BS is called the M-BS.
  • the f-BS 20 provides both a first RAT such as cellular communication and a second RAT based on an unlicensed frequency.
  • a first RAT such as cellular communication
  • a second RAT based on an unlicensed frequency.
  • the related art does not provide a substantial procedure as to which of the first RAT such as the cellular communication or the second RAT such as unlicensed frequency based RAT provided by the target f-BS 20 the terminal 20 is to select when the terminal 10 enters the coverage of the target f-BS 20.
  • the related art terminal 10 preferentially selects the first RAT such as cellular communication provided by the target f-BS 20 for its accessing, which results in a failure of utilization of the FMC technique.
  • the femto BS could deactivate a specfic RAT which is not used among the multiple RATs. In such situation, the terminal could not use the specific RAT to connect to the femto BS since the technique to allow the terminal to use the deactivated RAT is not provided.
  • the present invention has been made in view of the above-mentioned problem, and it is one object of the invention to allow a terminal to communicate with a target femto base station (FBS) by using the most suitable radio access technology (RAT) when the terminal newly accesses the target FBS or performs handover.
  • FBS target femto base station
  • RAT radio access technology
  • the present invention proposes a method for allowing a terminal for selecting an optimal radio access technology (RAT) over a serving FBS with which the terminal is communicating after accessing or a neighbor FBS which the terminal has not accessed yet but can communicate therewith, according to a current status of the terminal and the FBS.
  • RAT radio access technology
  • a method for allowing a terminal to use both a radio access technology (RAT) of a currently connected first FBS and a radio access technology (RAT) of a neighbor FBS when the terminal moves to an area where the coverage of the FBSs overlaps is also provided.
  • the method for controlling a configuration of the connections between a terminal and one or more neighbor BSs includes: receiving, by the serving BS and from a control station, information regarding radio access technologies (RATs) which are supported and have been activated or deactivated by the one or more neighbor BSs from a control station; transmitting an activation request message from the serving BS to the control station in order to activate at least one specific RAT in the deactivated state if there is a need for activating the deactivated RAT to connect the terminal to the one or more neighbor BSs; receiving, by the serving BS and from the control station, an activation response message including information regarding the neighbor BSs and information regarding the at least one specific RAT which is activated according to the activation request message; and transmitting a connection request message from the serving BS to the terminal to allow the terminal to be connected to the one or more
  • the method may further include: receiving, by the serving base station, a measurement report message with respect to one or more neighbor BSs from the terminal; and transmitting, by the serving BS, a report message with respect to the one or more neighbor BSs to the control station based on the measurement report message.
  • the method may further include: determining the at least one specific RAT required for connecting the terminal and the one or more neighbor BSs.
  • the step of the determining the at least one specific RAT may comprises determining whether to additionally establish a new session between the neighbor BSs and the terminal while the session which has been established between the serving base station and the terminal is maintained or whether to transfer a session which had been established between the serving base station and the terminal to the neighbor BSs.
  • the method may further include: transmitting a connection request message including information regarding one or mores RAT which are to be used for a connection with the neighbor BSs to the terminal; and receiving a connection response message including information regarding at least one specific RAT requested by the terminal.
  • the method may further include: exchanging, by the serving BS, at least one of information on at least one RAT supportable by the serving BS or by the terminal and information on at least one RAT preferred by the serving BS or by the terminal.
  • a method for establishing a connection including: receiving, by a terminal and from a serving BS, information regarding one or more neighbor base stations (BSs) and information regarding RATs which are supported and have been activated or deactivated by the one or more neighbor BSs; transmitting information regarding an RAT requested to be activated among the deactivated RATs; receiving , by the terminal and from the neighbor BSs, system information with respect to the RAT which is activated according to the transmission; and connecting the terminal to the neighbor BSs by using the system information.
  • BSs neighbor base stations
  • RATs which are supported and have been activated or deactivated by the one or more neighbor BSs
  • the method may further include: receiving a reference signal from the one or more neighbor base stations (BSs); and receiving system information including information regarding the one or more RATs which have been activated or deactivated by the one or more neighbor BSs from the neighbor BSs, wherein the system information is received through the RAT in a deactivated state.
  • BSs neighbor base stations
  • the method may further include: determining whether or not configuration of a connection to the one or more neighbor BSs is required after the information is received; and determining an RAT to be used for a connection to the one or more neighbor BSs if the configuration of a connection to the one or more neighbor BSs is required.
  • the method may further include: receiving a reference signal from the one or more neighbor BSs through the activated RAT; performing a cell measurement by using the reference signal; and determining whether to connect the terminal to the neighbor BSs according to the measurement results.
  • the method may further include: transmitting a result report on the connection to the serving BS after the connection is made.
  • a method for configuring a connection including: receiving, by a terminal which has accessed a serving femto base station (BS), system information including information regarding one or more RATs which are supported and have been activated or deactivated by one or more neighbor femto BSs from the one or more neighbor femto BSs, the system information being received through an RAT in an activated state; transmitting, by the terminal, a connection request message including information regarding the RAT in the activated state to the one or more neighbor femto BSs if it is needed to connect to the one or more neighbor femto BSs through at least one RAT in a deactivated state, the connection request message being transmitted by using the RAT in the activated state; and accessing the neighbor femto BSs by using an RAT activated according to the request.
  • BS serving femto base station
  • the method may further include: determining whether of a connection to the one or more neighbor BSs is required; and determining an RAT to be used for a connection to the one or more neighbor BSs if when the connection is required.
  • the method may further include: receiving a reference signal from the one or more neighbor BSs through the RAT activated according to the request; performing a cell measurement by using the reference signal; and determining whether to connect the terminal to the neighbor BSs according to the measurement results.
  • the method may further include: transmitting a result report on the connection to the serving BS after the connection is set.
  • a method for establishing a connection with a femto base station comprises performing, by a terminal, a capability negotiation procedure.
  • a capability negotiation procedure information on one or more RATs, which are supported and had been activated by at least one of the terminal and the femto base station, and information on at least one or more RATs, which are preferred by at least one of the terminal and the femto base station, are exchanged between the terminal and the femto base station (BS).
  • BS femto base station
  • the method may further comprise establishing, by the terminal, a first connection with the femto base station (BS) using a first RAT which has been activated based on the information; transmitting, by the terminal, a message for activating a specific RAT among the one or more deactivated RATs to the femto base station; establishing, by the terminal, a second connection with the femto base station (BS) using the specific RAT which has been activated according to the transmission of the message.
  • BS femto base station
  • the message for activating the specific RAT may be a connect request message including information on the specific RAT to be activated. Also, the method may further comprise receiving a connect response message including information on the specific RAT which has been activated according to the transmission of the connect request message.
  • the method may further comprises receiving, from the femto base station, a connect request message including information on the specific RAT.
  • the message for activating the specific RAT may be a connect request response message.
  • a particular terminal can selectively use an advantageous RAT according to the characteristics of a service the particular terminal currently uses.
  • the terminal can request thee femto BS to activate the specific RAT and then connect to the femto BS using the specific RAT.
  • traffic of terminals that may be concentrated into a single base station can be distributed.
  • excessive power consumption that may be otherwise generated when a base station simultaneously uses a plurality of communication schemes.
  • the terminal can simultaneously access a plurality of base stations through different RATs, the bandwidth can be increased.
  • FIG. 1 is a view illustrating an example of a femto cell-based network architecture according to the related art
  • FIG. 2 is a view illustrating another example of a femto cell-based network architecture according to the related art
  • FIG. 3 is a view illustrating the combination of a femto base station and an FMC (Fixed Mobile Convergence) technique
  • FIG. 4 is a conceptual view illustrating a method according to a first exemplary embodiment of the present invention.
  • FIG. 5 is a conceptual view illustrating a method according to a second exemplary embodiment of the present invention.
  • FIG. 6 is a conceptual view illustrating a method according to a third exemplary embodiment of the present invention.
  • FIG. 7 is a flow chart illustrating the process of the method of FIG. 4 according to the first exemplary embodiment of the present invention.
  • FIG. 8 is a flow chart illustrating the processes of the methods of FIGS. 5 and 6 according to the second and third exemplary embodiments of the present invention.
  • FIG. 9 is a flow chart illustrating the processes according to the fourth exemplary embodiments of the present invention.
  • FIG. 10 is a schematic block diagram showing the configuration of a terminal 100 and a femto base station 200 according to an exemplary embodiment of the present invention.
  • the present invention is applied to a femto base station (BS).
  • BS femto base station
  • the present invention can be also applicable to any communication system and method to which a technical idea of the present invention is applicable.
  • a terminal is used, but the terminal may be also referred to as a term such as user equipment (UE), mobile equipment (ME), mobile station (MS), or the like.
  • the UE may be a portable device such as a notebook computer, a mobile phone, a PDA, a smartphone, a notebook computer, and the like, or a non-portable device such as a PC or a vehicle-mounted device.
  • femto base station which may be also called a home (e)NodeB.
  • a mobile terminal and a femto cell base station are all available for communication by using a plurality of radio access technologies (RATs).
  • RATs radio access technologies
  • a first RAT such as 3GPP LTE, IEEE 802.16m, and the like
  • a second ratio access technology such as a wireless local area network (WLAN), BluetoothTM, ZigBeeTM, and the like
  • WLAN wireless local area network
  • BluetoothTM BluetoothTM
  • ZigBeeTM ZigBeeTM
  • an area in which communication areas of two adjacent base stations overlap is defined as a ‘overlapped region’
  • a mobile terminal located in the overlapped region can simultaneously communicate with a plurality of base stations by using a plurality of communication schemes.
  • a terminal is allowed to communicate with a neighbor femto base station (FBS) by using a second RAT, while communicating with a first FBS (i.e., a serving FBS) by using a first RAT, thus distributing traffic of the terminal into the two BSs.
  • FBS neighbor femto base station
  • the terminal may selectively use an RAT having the best access quality according to a channel state among the RATs provided by the respective BSs.
  • the terminal may measure each channel quality with respect to the RATs provided by the first and second BSs and access through an RAT having good channel quality to each base station according to each channel quality. For example, when access quality of a cellular-based RAT with respect to the first BS is good and access quality of a second RAT wit respect to the second BS is good, the terminal communicates with the first BS by using the first RAT and communicates with the second BS by using the second RAT, thus improving communication quality and the bandwidth of the terminal.
  • a scheme in which the first femto BS determines whether to generate a new RAT different from the RAT based on which the terminal is connected to the first femto BS and a scheme in which the terminal determines it by itself are provided.
  • the terminal when the terminal performs handover from the first BS to the neighbor second BS, the terminal may be allowed to use the second RAT,
  • the BSs provide a plurality of RATs, but when a particular RAT is not in use, the BSs deactivate the particular RAT.
  • the deactivation refers to not performing an operation wirelessly for the corresponding RAT.
  • the terminal when the terminal attempts to access the second BS, if the particular RAT has been deactivated, the terminal can activate the deactivated RAT of the second BS according to the method of an exemplary embodiment of the present invention.
  • FIG. 4 is a conceptual view illustrating a method according to a first exemplary embodiment of the present invention.
  • a terminal 100 a terminal 100, a first femto BS 210, a second femto BS 220, and a femto cell network controller (FNC) 400 are illustrated.
  • FNC femto cell network controller
  • the first or second femto BS 210 or 220 provides a cellular-based first RAT and a unlicensed frequency-based second RAT (e.g., UMA, WLAN, BluetoothTM, Zigbee, White Space Communication and the like).
  • a cellular-based first RAT e.g., UMA, WLAN, BluetoothTM, Zigbee, White Space Communication and the like.
  • a cell coverage of the cellular-based RAT may be smaller than that of the unlicensed frequency-based second RAT. This is because a transmission coverage are various according to a characteristic of each RAT.
  • the first or second femto BS 210 or 220 may appropriately deactivate a currently unused RAT among multiple RATs.
  • FIG. 4 illustrates that the second femto BS 220 activates only the cellular-based first RAT and deactivates the unlicensed frequency-based second RAT.
  • the terminal 100 is provided with a service through the cellular-based RAT and the unlicensed frequency-based RAT from the first BS 210.
  • the terminal moves to a overlapped region in which the cell coverage of the first femto BS 210 and the second femto BS 220 overlaps. Then, the terminal 100 transmits a request for activating the second RAT of the second femto BS 220 to the femto cell network controller (FNC) 400 through the first femto BS 210 or the first femto BS 210 transmits a request for activating the second RAT to the FNC.
  • FNC cell network controller
  • the FNC 400 delivers the activation request to the second femto BS 220.
  • the terminal 100 transfers the session which has been connected with the first femto BS 210 according to the second RAT to the second femto BS 220.
  • the terminal 100 may perform a service according to the first RAT with the first femto BS 210, and perform a service according to the second RAT with the second femto BS 220.
  • the first femto BS 210 and the second femto BS 220 can cooperatively provide a service to the terminal.
  • the first femto BS 210 can distribute traffic to the second femto BS 220.
  • the first femto BS 220 may deactivate the first RAT.
  • the second femto BS 220 may activate only the second wireless access scheme, and then when there is no terminal connected by using the first RAT, the second femto BS 220 may deactivate the first RAT.
  • FIG. 5 is a conceptual view illustrating a method according to a second exemplary embodiment of the present invention.
  • the terminal 100, the first femto BS 210, and the second femto BS 220 are illustrated.
  • the terminal 100 transmits a request for activating the second RAT of the second femto BS 220 to the second femto BS 220.
  • the terminal 100 directly transmits the activation request by using the activated RAT.
  • the second exemplary embodiment of the present invention in which the terminal 100 transmits the activation request to the neighbor second femto BS 220, namely, to the target femto BS is effective when the second femto BS 220 is not connected with the FNC and the respective femto BSs are disposed in such a distributed manner that they perform a control function by themselves.
  • the second exemplary embodiment is advantageous in that, because the terminal 100 activates the RAT of the neighbor second femto BS according to the determination of the terminal 100 itself and does not pass through the FNC, a new connection can be quickly established.
  • the terminal 100 may perform a service with the first femto BS 210 according to the first RAT, and performs a service with the second femto BS 220 according to the second RAT.
  • the first femto BS 210 and the second femto BS 220 may cooperatively provide a service for the terminal 100.
  • FIG. 6 is a conceptual view illustrating a method according to a third exemplary embodiment of the present invention.
  • the terminal 100 transfers a session ongoing through the first RAT with the first femto BS 210 to the second femto BS 220.
  • the session is transferred to the second femto BS 220, it is configured by using the second RAT.
  • the ongoing session is transferred to the second femto BS 220.
  • the terminal 100 transmits a request message for activating the second RAT of the second femto BS 220 to the second femto BS 220.
  • the request message may be transmitted through the first femto BS 210 to the second femto BS 220.
  • the activation request may include handover-related information (e.g., information indicating that handover is requested, and information required for handover).
  • the handover-related information may include a time (rendezvous time) at which the terminal is to access the second femto BS, information on security, Service QoS, user priority level information, and the like.
  • the terminal activates the second RAT of the second femto BS and, at the same time, transmits a handover request, whereby the terminal can quickly transfer the ongoing session.
  • FIG. 7 is a flow chart illustrating the process of the method of FIG. 4 according to the first exemplary embodiment of the present invention.
  • the first femto BS determines whether or not a new RAT different from an RAT according to which the terminal 100 is connected with the first femto BS is to be generated.
  • the terminal 100 when the neighbor second femto BS 220, to which the terminal 100 wants to be connected, has deactivated all the RATs so there is no RAT being currently operated, the terminal 100 cannot communicate with the neighbor second femto BS 220, and thus, it cannot request a connection with respect to a particular RAT from the second femto BS 220.
  • the terminal 100 can request the FNC 400 to activate a particular RAT of the second femto BS 220 through the first femto BS 210.
  • the terminal 100 performs a basic capability negotiation with the first femto BS 210, e.g., the illustrated serving femto BS. Namely, the terminal 100 transmits information regarding supported RATs (available RAT Info) and information regarding a preferred RAT (RAT preference Info) to the first femto BS 210. Also, the first femto BS 210 transmits information regarding supported RATs (available RAT Info) and information regarding a preferred RAT (RAT preference Info) to the terminal 100.
  • the information regarding supported RATs (available RAT Info) may include IDs of RATs.
  • the information regarding the preferred RATs (RAT preference Info) may be expressed in the ascending order or descending order according to priority levels of the preferred RATs. In this case, the different types of RATs may be represented by different IDs.
  • the basic capability negotiation may be performed when the terminal 100 initially accesses the first femto BS or when the capability (for example, a preferred RAT) of the terminal 100 or the first femto BS 210 is changed.
  • the neighbor second femto BS 220 transmits a reference signal by using an RAT which is currently activated and operated.
  • the second femto BS 220 transmits system information.
  • the system information transmitted by the second femto BS 220 includes information regarding at least one or more RAT supported by the second femto BS.
  • the RAT which has been activated to be currently operated may be WCDMA. LTE, or IEEE 802.16.
  • the system information may be a beacon message based on IEEE 802.16.
  • the system information may be transmitted on a primary common control physical channel (PCCPCH).
  • the supportable RAT included in the system information includes information regarding every available RAT as well as the RAT which has been activated to be currently operated.
  • the terminal 100 can know about all sorts of RATs supported by the second femto BS through the system information.
  • the terminal 100 performs a cell detection with respect to the second femto BS based on the received reference signal and measures channel quality.
  • the terminal 100 transmits a measurement report message including the measurement results to the serving femto BS, namely, the first femto BS, to which the terminal 100 is currently connected.
  • the measurement report message may include a UE ID indicating the ID of the terminal 100, a neighbor FBS ID indicating the ID of the detected neighbor femto BS, and a neighbor FBS RSSI indicating a signal strength of the second femto BS.
  • the measurement report message may include information regarding an RAT supported by the second femto BS.
  • the first femto BS 210 searches a neighbor BS and stores its search results in addition to the measurement report message which has been received from the terminal 100.
  • the first femto BS 210 transmits a femto status report message to the FNC 400.
  • the femto status report message may be generated based on the measurement may be generated based on the measurement report message received from the terminal 100 and the search results of the first femto BS 210.
  • the femto status report message may include the ID (UE ID) of the terminal, the ID of the serving femto BS (Serving FBS ID), the ID of the neighbor femto BS (neighbor FBS ID), a signal strength value of the neighbor femto BS (neighbor FBS RSSI) and information on at least one or more RATs supportable by the neighbor femto BS.
  • the FNC 400 When the FNC 400 receives the femto status report message, it checks neighbor femto BSs adjacent to the serving femto BS of the terminal 100 based on the femto status report message, and when the terminal 100 requests a new connection, the FNC 400 recognizes an accessible femto BS. In this case, the FNC 400 may recognize a femto BS the terminal can access, by using previously recognized location information of femto BSs.
  • the FNC 400 transmits a neighbor cell system information message, e.g., Neighbor Cell System Info message, including information regarding the recognized femto BSs, to the first femto BS.
  • the neighbor cell system information message e.g., the Neighbor Cell System Info message, includes information IDs of the accessible femto BSs and information regarding available RATs of the corresponding femto BSs.
  • the first femto BS 210 determines whether or not the terminal 100 should establish a connection with the second femto BS. Also, the first femto BS 210 determines whether or not a connection should be established with the neighbor second femto BS according to an RAT different from the connected RAT.
  • the first femto BS 210 when the first femto BS 210 receives a neighbor cell system information message from the FNC 400, it determines one or more neighbor femto BSs most suitable for the terminal 100 based on the received neighbor cell system information message and determines one or more RATs to be used for a connection with the determined neighbor femto BSs.
  • the first femto BS 210 transmits a connection request message requesting the terminal 100 to be connected with the determined femto BSs according to the determined RAT, to the terminal 100.
  • the connection request message includes the results of the determination.
  • the connection request message includes IDs of one or more femto BSs determined by the first femto BS and the IDs regarding the one or more determined RATs.
  • the terminal 100 When the terminal 100 receives the connection request message, it determines whether to generate a new connection with the one or more femto BSs. In this case, the terminal 100 may determine which of the femto BSs it is to be connected according to which of the RATs.
  • the terminal 100 transmits a connection response message including the results of the determination to the first femto BS.
  • the results of the determination included in the connection response message includes information indicating whether the terminal agrees with the new connection or whether the terminal denies the new connection, information indicating the corresponding reason, IDs of one or more femto BSs desired to be connected, and IDs of the one or more RATs according to which the terminal is to be connected with the femto BSs desired to be connected.
  • the reason information indicates whether or not the terminal wants to establish a new connection with the second femto BS 220 while maintaining the connection with the first femto BS or whether or not the terminal wants to perform handover to transfer the connection with the first femto BS to the second femto BS 220.
  • the connection response message may further include handover-related information.
  • the handover-related information may include a time (rendezvous time) at which the terminal is to be connected to the second femto BS, security, QoS, user priority level information, and the like.
  • the terminal 100 may activate the RATs of the neighbor femto BSs, measure channel quality, and select a neighbor femto BS having the best quality and an RAT having the best quality.
  • the first femto BS 210 may refer to the results of the determination by the terminal within the connection response message, and check whether or not an RAT according to which the terminal wants to be connected has been deactivated by the corresponding femto BS.
  • the first femto BS 210 transmits a neighbor femto BS activation request message, e.g., a Neighbor FBS Activate Request message, to the FNC 400 in order to request for an activation of the RAT.
  • the activation request message includes the ID of the corresponding femto BS and the ID of the RAT requested to be activated.
  • the FNC 400 transmits an activation request message, e.g., an RAT active request message’ to the corresponding femto BS, e.g., the second femto BS 220, with reference to the ID of the femto BS included in the neighbor femto BS activation request message.
  • the activation request message includes information regarding an RAT requested to be activated, namely, an ID.
  • the second femto BS determines whether to activate the corresponding RAT and performs activation.
  • the activation refers to changing the corresponding RAT to a state in which the terminal can access by using a radio frequency.
  • the second femto BS 220 transmits an activation response message, e.g., an RAT Activate Response message, including the results of the determination, to the FNC 400.
  • the activation response message includes the determination regarding the activation (i.e., whether the activation of the corresponding RAT is agreed or denied) and reason information.
  • the FNC 400 When the FNC 400 receives the activation response message, e.g., the RAT Activate Response message, the FNC transmits a neighbor femto BS activation response message, e.g., a Neighbor FBS Activate Response message, to the first femto BS 210.
  • the neighbor femto BS activation response message includes information (e.g., the ID) regarding the femto BS activated according to the response and information (e.g., the ID) regarding the RAT activated according to the request.
  • the first femto BS 210 When the first femto BS 210 receives the neighbor femto BS activation response message, it transmits an access command message to the terminal.
  • the access command message includes information (e.g., the IDs) regarding neighbor femto BSs, information regarding the activate RAT, and system information required for the terminal 100 to access the neighbor femto BS according to the corresponding RAT.
  • the terminal 100 receives a reference signal and system information according to one or more activate RATs from the one or more neighbor femto BSs. Then, the terminal 100 performs measurement through the reference signal and determines an RAT and a femto BS each having the best channel quality.
  • the terminal 100 is connected to the corresponding femto BS, e.g., the second femto BS 22, according to the RAT having the best channel quality. And then, the terminal 100 transmits a connection result report message to the first femto BS 210.
  • the connection result report message includes the ID of the terminal (UE ID), information regarding the accessed neighbor femto BS, and the information (RAT ID) regarding the RAT according to which the terminal is connected to the neighbor femto BS.
  • the plurality of femto BSs may deactivate the activated RATs.
  • the first femto BS determines whether or not it generates a new RAT different from the RAT according to which the terminal 100 is connected with the first femto BS has been described.
  • the method in which the terminal determines will be described.
  • FIG. 8 is a flow chart illustrating the processes of the methods of FIGS. 5 and 6 according to the second and third exemplary embodiments of the present invention.
  • the terminal 100, the first femto BS 210, the second femto BS 220 are illustrated.
  • the terminal 100 is connected to the first femto BS 210 according to a first RAT.
  • the second femto BS adjacent to the first femto BS 210 periodically transmits a reference signal through an RAT which has been activated to be currently operated by the second femto BS. And, the second femto BS 220 periodically transmits system information including information regarding a supportable RAT.
  • the terminal 100 performs a cell detection with respect to the second femto BS based on the received reference signal and measures channel quality. And then, the terminal 100 checks whether or not the RAT currently activated by the second femto BS 220 is an RAT required by the terminal 100. In other words, the terminal 100 checks RATs supported by the second femto BS based on the received system information, and determines whether or not the activated RAT is an access scheme required by the terminal 100 or whether or not there is an RAT required by the terminal 100 among the RATs supported by the second femto BS.
  • connection request message may include the ID of the terminal (UE ID) and information regarding the one or more requested RATs (e.g., RAT ID).
  • the connection request message may further include an identifier of the second femto BS.
  • connection request message may further include information indicating whether or not the terminal wants to establish a new connection with the second femto BS 220, while maintaining the connection with the first femto BS, or whether or not the terminal wants to perform handover to transfer the connection with the first femto BS 210 to the second femto BS 220.
  • the connection request message may further include handover-related information.
  • the handover-related information may include a time (rendezvous time) at which the terminal is to be connected to the second femto BS, security, QoS, user priority level information, and the like.
  • the connection response message may include an identifier of the terminal (e.g., UE ID), information indicating whether the connect request is agreed or denied. If the connect request is denied, the connection response message may further include information indicating a reason why the connect request is denied.
  • the connection response message includes the ID of the second femto BS and the information (e.g., RAT IDs) regarding the one or more activated RATs.
  • the second femto BS 220 transmits a reference signal and system information through the activate RAT.
  • the terminal 100 performs measurement through the reference signal and connected to the second femto BS 220 according to the RAT having the best channel quality among the one or more activated RATs.
  • the terminal 100 transmits a connection request report message to the first femto BS 210.
  • the connection request report message includes the ID of the terminal (UE ID), the information regarding the accessed neighbor femto BS (connected FBS ID), and the information (RAT ID) regarding the radio access (RAT ID) according to which the terminal is connected to the second femto BS 220.
  • FIG. 9 is a flow chart illustrating the processes according to the fourth exemplary embodiments of the present invention.
  • the terminal 100 while the terminal 100 communicates with the serving femto BS 210 using a first RAT, the terminal 100 further uses a second RAT to communicate with the serving femto BS 210. This will be described in detail as follows.
  • the terminal 100 performs a basic negotiation with respect to capabilities.
  • the terminal 100 exchanges information on one or more supported RATs and information on at least one preferred RAT with the serving femto BS 210.
  • the serving femto BS 210 exchanges information on one or more supported RATs and information on at least one preferred RAT with the terminal 100.
  • the information on the at least one preferred RAT may be so-called as RAT preference information and represent the preferred RAT in deceasing order or increasing order.
  • RAT preference information different types of RATs are discriminated by identifiers.
  • the basic negotiation may be further performed.
  • the terminal 100 and the serving femto BS 210 select a first RAT among the preferred RATs and communicates each other using the selected first RAT.
  • the terminal and the serving femto BS 210 use the first RAT to communicate each other, it is determined whether to use a second RAT different from the first RAT for the communication between the serving femto BS 210 and the terminal 100.
  • the determination may be performed by the serving femto BS 210 or by the terminal 100.
  • the serving femto BS 210 uses the first RAT to communicate with the terminal 100, the serving femto BS 210 determines whether to uses a second RAT.
  • the serving femto BS 210 transmits a connect request message, for example a RAT Connect Request message to the terminal 100.
  • the connect request message includes at least one or more of an ID of the terminal (i.e., UE ID) and an ID of the serving femto BS.
  • the connect request message may further include information on the second RAT (i.e., ID of the second RAT).
  • the terminal 100 After receiving the connect request message, the terminal 100 determines whether to use the second RAT for the communication with the serving femto BS 210. Then, the terminal 100 transmits a response message, for example a RAT Connect Response message to the serving femto BS 210.
  • the connect response message may include an ID of the terminal and an ID of the serving femto BS. Also, the connect response message further includes the result of the determination (for example, agree/deny). If the result of the determination indicates a refusal, deny, or reject, the connect response message may further include information on a reason of the refusal, deny, or reject. Also, the connect response message may further includes information on the serving femto BS (i.e., an ID) and information on the second RAT.
  • the terminal 100 While the terminal 100 uses the first RAT to communicate with the serving femto BS 210, the terminal 100 determines whether to uses a second RAT.
  • the terminal 100 transmits a connect request message, for example a RAT Connect Request message to the serving femto BS 210.
  • the connect request message includes at least one or more of an ID of the terminal (i.e., UE ID) and an ID of the serving femto BS.
  • the connect request message may further include information on the second RAT (i.e., ID of the second RAT).
  • the serving femto BS 210 After receiving the connect request message, the serving femto BS 210 determines whether to use the second RAT. And then, the serving femto BS 210 transmits a connect response message, for example a RAT Connect Response message to the terminal 100.
  • a connect response message for example a RAT Connect Response message
  • the serving femto BS 210 activate the second RAT.
  • the serving femto BS 210 transmits a connect command message, for example RAT Connect Command message using the activated second RAT to the terminal 100.
  • the connect command message includes at least one or more of an ID of the terminal and an ID of the serving femto BS, an ID of the second RAT, system information required for the terminal to set the connection with the serving femto BS 210.
  • the serving femto BS 210 transmits a reference signal using the second RAT.
  • the terminal 100 receives the connect command message and then receives the reference signal based on the system information included in the connect command message. And the terminal 100 performs a channel measurement with respect to the serving femto BS usng the received reference signal. If a value of the channel is higher than a pre-determined threshold value, the terminal 100 tries to set a connection using the second RAT
  • the serving femto BS 210 may deactivate the second RAT, if the terminal does not set the connection using the second RAT, the terminal 100 refuses to use the second RAT, or the terminal 100 fails to use the second RAT.
  • the methods according to the present invention described thus far can be implemented as software, hardware or their combination.
  • the method according to the present invention may be stored in a storage medium (e.g., an internal memory, a flash memory, a hard disk, and the like), and may be implemented as codes or commands in a software program that can be executed by a processor (e.g., a microprocessor). This will now be described with reference to FIG. 10.
  • a storage medium e.g., an internal memory, a flash memory, a hard disk, and the like
  • a processor e.g., a microprocessor
  • FIG. 10 is a schematic block diagram showing the configuration of a terminal 100 and a femto base station 200 according to an exemplary embodiment of the present invention.
  • the terminal 100 includes a storage unit 110, a controller 120, and a transceiver 130.
  • the femto BS 200 includes a storage unit 210, a controller 220, and a transceiver 230.
  • the storage units 110 and 220 store the methods according to the first to fourth exemplary embodiments illustrated in FIGS. 4 to 9.
  • the controllers 120 and 220 control the storage units 110 and 210 and the transceivers 130 and 230.
  • the controllers 110 and 220 execute the methods stored in the storage units 110 and210.
  • the controllers 120 and 220 transmit the foregoing signals through the transceivers 130 and 230.

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

Abstract

L'invention porte sur un procédé de commande de connexions entre un terminal et une ou plusieurs stations de base (BS) voisines par une BS de desserte relativement au terminal. Le procédé de commande d'une configuration de connexions entre un terminal et une ou plusieurs BS voisines comprend : la réception, par la BS de desserte et en provenance d'une station de commande, d'informations concernant des technologies d'accès radio (RAT) qui sont prises en charge et ont été activées ou désactivées par la ou les BS voisines à partir d'une station de commande ; l'envoi d'un message de requête d'activation de la BS de desserte à la station de commande de façon à activer la technologie d'accès radio dans l'état désactivé s'il existe un besoin d'activer la RAT désactivée pour connecter le terminal à la ou aux BS voisines ; la réception, par la BS de desserte et en provenance de la station de commande, d'un message de réponse d'activation comprenant des informations concernant les BS voisines et des informations concernant la ou les technologies d'accès radio spécifiques qui sont activées conformément au message de requête d'activation ; et l'envoi d'un message de requête de connexion de la BS de desserte au terminal pour autoriser le terminal à être connecté à la ou aux BS conformément à la ou aux technologies d'accès radio activées en utilisant la ou les RAT spécifiques.
PCT/KR2010/006595 2010-04-07 2010-09-28 Procédé de commande de configuration de connexions par station de base femto et procédé de configuration de connexion par terminal WO2011126186A1 (fr)

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US13/639,352 US9179375B2 (en) 2010-04-07 2010-09-28 Method for controlling connection configuration by femto base station and method for configuring connection by terminal

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US32183510P 2010-04-07 2010-04-07
US61/321,835 2010-04-07
KR1020100048761A KR101637587B1 (ko) 2010-04-07 2010-05-25 펨토 기지국에서 연결 설정을 제어하는 방법 및 단말에서 연결을 설정하는 방법
KR10-2010-0048761 2010-05-25

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