WO2011136530A2 - Apparatus and method for x2 interface setup and cell switching in mobile communication system - Google Patents

Apparatus and method for x2 interface setup and cell switching in mobile communication system Download PDF

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Publication number
WO2011136530A2
WO2011136530A2 PCT/KR2011/003011 KR2011003011W WO2011136530A2 WO 2011136530 A2 WO2011136530 A2 WO 2011136530A2 KR 2011003011 W KR2011003011 W KR 2011003011W WO 2011136530 A2 WO2011136530 A2 WO 2011136530A2
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WO
WIPO (PCT)
Prior art keywords
cell
csg
access
source
target
Prior art date
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Ceased
Application number
PCT/KR2011/003011
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English (en)
French (fr)
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WO2011136530A3 (en
Inventor
Hong Wang
Lixiang Xu
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to AU2011245876A priority Critical patent/AU2011245876B2/en
Priority to JP2013507877A priority patent/JP6312126B2/ja
Priority to CA2797418A priority patent/CA2797418C/en
Priority to RU2012145807/08A priority patent/RU2595913C2/ru
Priority to EP11775235.2A priority patent/EP2564664B1/en
Publication of WO2011136530A2 publication Critical patent/WO2011136530A2/en
Publication of WO2011136530A3 publication Critical patent/WO2011136530A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context 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
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • Another aspect of the present invention is to provide an apparatus and method for performing a handover between home BSs using an X2 interface in a mobile communication system.
  • Another aspect of the present invention is to provide an apparatus and method for establishing an X2 interface between home BSs in a mobile communication system.
  • an apparatus for a BS in a mobile communication system includes a controller for determining whether to permit a handover of an UE based on access mode of a target BS, a communication unit for transmitting a handover request to the target BS, wherein the handover request comprises a group member state indication of the UE, and for receiving a handover response from the target BS.
  • an apparatus for a BS in a mobile communication system includes a communication unit for receiving a handover request comprising a CSG IDentifier (ID) supported by the target cell which is reported from the UE, and a controller for determining whether the CSG ID included in the handover request is consistent with the CSG ID supported by the target cell before transmitting the access request, wherein the communication unit transmits the access request to a Mobile Management Entity (MME) when the CSG IDs are consistent, and transmits a handover failure message to the source BS when the CSG IDs are not consistent.
  • MME Mobile Management Entity
  • FIG. 1 is a diagram illustrating a System Architecture Evolution (SAE) system architecture according to the related art
  • FIG. 2 is a diagram illustrating a procedure for setting up an X2 interface according to an exemplary embodiment of the present invention
  • FIG. 7 is a diagram illustrating a procedure of a UE accessing a source cell in a source BS required to switch to a target cell in a target BS according to an exemplary embodiment of the present invention
  • FIG. 8 is a block diagram of a BS in a mobile communication system according to an exemplary embodiment of the present invention.
  • FIG. 9 is a block diagram of a Mobile Management Entity (MME) in a mobile communication system according to an exemplary embodiment of the present invention.
  • MME Mobile Management Entity
  • the access mode of the CSG is the Open mode
  • the X2 interface setup request can further include an identifier of the BS 210, and/or information of the cell on the BS 210.
  • the request can include at least one of information of an adjacent cell of the BS 210, and information of a Mobile Management Entity (MME) pool to which the BS 210 belongs.
  • MME Mobile Management Entity
  • the access mode of the CSG is the Open mode
  • the X2 interface response message can further include an identifier of the BS 220, and/or information of the cell on the BS 220.
  • the message can include at least one of information of an adjacent cell of the BS 220, and information of an MME pool to which the BS 220 belongs.
  • FIG. 4 is a diagram illustrating a procedure of a User Equipment (UE) accessing a source cell required to handover to a target cell according to an exemplary embodiment of the present invention.
  • the exemplary embodiment of the present invention is applied to the system structure illustrated in FIG. 3. It is assumed herein that a source cell on a source BS and a target cell on a target BS are both cells supporting a CSG function and correspond to the same CSG, i.e., a CSG ID broadcasted in the source cell is the same as that in the target cell. Also, an X2 interface has been established in accordance with the method illustrated in FIG. 2 by the source BS and the target BS.
  • UE User Equipment
  • the source BS 420 can also perform a CSG detection function, i.e., determine whether the CSG ID supported by the target cell is consistent with that reported in the measurement report by the UE 410. If it is determined that the CSG ID is consistent, the source BS 420 permits the handover of the UE 410 to the target cell Otherwise, the source BS 420 refuse to handover the UE 410 to the target cell if the target cell is the CSG cell.
  • a CSG detection function i.e., determine whether the CSG ID supported by the target cell is consistent with that reported in the measurement report by the UE 410. If it is determined that the CSG ID is consistent, the source BS 420 permits the handover of the UE 410 to the target cell Otherwise, the source BS 420 refuse to handover the UE 410 to the target cell if the target cell is the CSG cell.
  • the X2 handover process is implemented as described above.
  • the source BS 520 determines that the target cell and the source cell do not support the same CSG, and then transmits an access request to the MME 540 if the target cell is a cell having a CSG capability.
  • the source BS 520 knows that the cell in the target BS 530 supports the CSG when establishing the X2 interface with the target BS 530.
  • the source BS 520 can easily determine whether the target cell and the source cell support the same CSG according to the CSG information that is known. If it is determined that the target cell and the source cell support the same CSG, the source BS 520 operates in accordance with the procedure illustrated in FIG. 4.
  • the source BS 520 transmits an RRC reconfiguration request to the UE 510.
  • the RRC reconfiguration request includes the “RRC message to be transmitted to the UE 510” transmitted to the source BS 520 by the target BS 530 in step 507.
  • the “RRC message to be transmitted to the UE 510” is transmitted to the source BS 520 by the target BS 530, and then transmitted to the UE 510 by the source BS 520.
  • the RRC message to be transmitted to the UE 510 can include a C-RNTI allocated to the UE 510 by the target cell, and/or encryption information of the target BS 530, and may further include information of an allocated random access channel.
  • step 613 if the UE 610 is permitted to access the target cell, the target BS 620 performs the access control of the resource according to E-RAB QoS information included by the handover request in step 605, and transmits the handover request response to the source BS 620.
  • the access control in step 607 relies on whether the physical resource in the target BS 620 can meet requirements of the E-RAB QoS, and a sufficient resource is allocated to the E-RAB, which is a current function of the target BS 620.
  • the X2 handover process illustrated in FIG. 5 is implemented as described above.
  • the source BS that triggers the MME to perform the CSG access control
  • the target BS that triggers the MME to perform the CSG access control.
  • the source BS and the target BS may respectively trigger the MME to perform the access control, i.e., the source BS triggers the MME to perform the access control of the CSG cell and the target BS triggers the MME to perform the access control of the Hybrid cell, which is describe in more detail below with reference to FIG. 7.
  • the source BS 720 determines that the target cell and the source cell do not support the same CSG, and the source BS 720 transmits the access request to the MME 740 if the target cell is the CSG cell.
  • the CSG ID supported by the target cell and the identifier of the UE 710 can be included in the access request.
  • the access mode of the target cell is the Hybrid mode
  • any of the users is permitted to access the target Hybrid cell.
  • the determining, by the source BS 720, as to whether the target cell and the source cell do not support the same CSG and the transmitting the access request to the MME 740 in steps 705 and the controlling of access of the UE 710 according to the CSG ID supported by the target cell and subscription information of the UE 710 in step 707 may be skipped, and an operation of transmitting the handover request to the target BS 730 in step 709 may be directly performed.
  • an indication of an X2 signaling context allocated to the UE 710 by the source BS 720, an indication by the core network, an indication of an S1 signaling context allocated to the UE 710 by the core network, an identifier of the target cell, encryption information and an encryption capability of the UE 710, information of an RRC context and information of an E-RAB are included in the handover request.
  • step 711 if the UE 710 is permitted to access the target cell, the target BS 720 performs the access control of the resource according to the E-RAB QoS information included by the handover request in step 709, and transmits the handover request response to the source BS 720.
  • the access control in Step 707 relies on whether a physical resource in the target BS 720 can meet requirements of the E-RAB QoS, and a sufficient resource is allocated to the E-RAB, which is a current function of the target BS 720.
  • the handover request response includes an indication of an X2 signaling context allocated to the UE 710 by the target BS 720, and/or an RRC message to be transmitted to the UE 710, and if required, also includes GTP tunnel information for data transfer.
  • the source BS 720 transmits an RRC reconfiguration request to the UE 710.
  • the RRC reconfiguration request includes the “RRC message to be transmitted to the UE 710” transmitted to the source BS 720 by the target BS 730 in the above step 707.
  • the “RRC message to be transmitted to the UE 710” is transmitted to the source BS 720 by the target BS 730, and then transmitted to the UE 710 by the source BS 720.
  • the RRC message to be transmitted to the UE 710 can include a C-RNTI allocated to the UE 710 by the target cell, and/or encryption information of the target BS 730, and may further include information of an allocated random access channel.
  • step 715 the UE 710 performs synchronization with the target cell, and, in step 717, the UE 710 transmits an RRC reconfiguration completion message to the target BS 730 after completing the synchronization.
  • the target BS 720 transmits the path switching request message to the MME 740, to notify the UE 710 that it has already been switched to a new cell, i.e., the target cell.
  • a new cell i.e., the target cell.
  • an indication of an S1 signaling context allocated to the UE 710 by the target BS 720 and tunnel information for downlink data reception are included in the path switching request message.
  • the path switching request message can further include the access mode and the CSG ID supported by the target cell.
  • the MME 740 transmits the path switching response message to the target BS 720.
  • an indication of an S1 signaling context allocated to the UE 710 by the MME 740 and/or tunnel information for uplink data are included in the path switching response message, and if necessary, encryption information can also be included.
  • the group member state indication of the UE 710 i.e., whether the UE 710 is the group member of the target cell, is also included in the path switching response message. That is, the group member state indication can be set as “being a group member” or “not a group member”, and can also be set as “being a group member” only. If no setting is made, the UE 710 is considered as being not the group member.
  • the target BS 720 schedules the UE 710 according to the group member state indication of the UE 710.
  • the transmitting of the path switching response message by the MME 740 to the target BS 720 in step 721 is executed when the target cell is the Hybrid cell.
  • the main reason for this is that any of the Hybrid cells permits the UE 710 to have access, but in the scheduling, the UE 710 can be scheduled based on two roles, i.e., as the group member or not as the group member. If the target cell is not the Hybrid cell, e.g., is the Closed cell, it is possible that the path switching response message does not include the group member state indication of the UE 710, which can specifically be similar to step 415 illustrated in FIG. 4.
  • FIG. 8 is a block diagram of a BS in a mobile communication system according to an exemplary embodiment of the present invention.
  • the BS includes a Radio Frequency (RF) processor 810, a modem 820, a backhaul communication unit 830, a storage unit 840 and a controller 850.
  • RF Radio Frequency
  • the RF processor 810 performs functions, such as signal band conversion and amplification, to transmit and receive signals over a radio channel. That is, the RF processor 810 up-converts a baseband signal output from the modem 820 into the RF signal and transmits the RF signal over an antenna, and down-converts the RF signal received over the antenna into the baseband signal.
  • the RF processor 810 may include an amplifier, a mixer, an oscillator, a Digital to Analog Convertor (DAC), an Analog to Digital Convertor (ADC) and the like.
  • the modem 820 converts the baseband signal and a bit string according to a physical layer standard of the system. For example, to transmit data, the modem 820 generates complex symbols by encoding and modulating a transmit bit string, maps the complex symbols to subcarriers, and constitutes Orthogonal Frequency-Division Multiplexing (OFDM) symbols by applying Inverse Fast Fourier Transform (IFFT) and inserting a Cyclic Prefix (CP).
  • OFDM Orthogonal Frequency-Division Multiplexing
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • the modem 820 splits the baseband signal output from the RF processor 810 into OFDM symbols, restores the signals mapped to the subcarriers using Fast Fourier Transform (FFT), and restores the receive bit string by demodulating and decoding the signals.
  • FFT Fast Fourier Transform
  • the controller 850 controls the functions of the BS. For example, the controller 850 generates a transmit packet and a message and provides the modem 820 with the transmit packet and the message. The controller 850 also processes a receive packet and a message from the modem 820. More particularly, according to an exemplary embodiment of the present invention, the controller 850 controls a procedure to establish an X2 interface with another BS, a procedure for a handover of an UE from another BS to the BS and a procedure for a handover of a UE from the BS to another BS. For example, the controller 850 controls a procedure to establish an X2 as illustrated in FIG. 2. For example, the controller 850 controls a procedure for a handover as illustrated in FIG. 4 to FIG. 7.
  • the backhaul communication unit 830 transmits an X2 interface setup request to a second BS, and receives an X2 interface response message from the second BS.
  • the X2 interface setup request comprises an access mode of a Closed Subscriber Group (CSG) supported by a cell on the first BS.
  • the X2 interface response message comprises the access mode of the CSG supported by the cell on the second BS.
  • the storage unit 840 stores the access mode of the CSG supported by the cell on the second BS.
  • the controller 850 determines whether to permit a handover of an UE based on an access mode of a target BS, and the backhaul communication unit 830 transmits a handover request to the target BS and receives a handover response from the target BS.
  • the handover request comprises a group member state indication of the UE.
  • the backhaul communication unit 830 receives a handover request comprising a CSG ID supported by the target cell which is reported from the UE, and the controller 850 determines whether the CSG ID included in the handover request is consistent with the CSG ID supported by the target cell before transmitting access request. If the CSG IDs are consistent, the backhaul communication unit 830 transmits the access request to the MME. However, if the CSG IDs are not consistent, the backhaul communication unit 830 transmits a handover failure message to the source BS.
  • FIG. 9 is a block diagram of a MME in a mobile communication system according to an exemplary embodiment of the present invention.
  • the MME includes a communication unit 910, a storage unit 920, and a controller 930.
  • an access mode and a CSG ID supported by the cell at an opposite end can be known when an X2 interface is established between BSs.
  • a BS can be facilitated in performing control on access of the UE when serving as a source BS.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/KR2011/003011 2010-04-28 2011-04-26 Apparatus and method for x2 interface setup and cell switching in mobile communication system Ceased WO2011136530A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2011245876A AU2011245876B2 (en) 2010-04-28 2011-04-26 Apparatus and method for X2 interface setup and cell switching in mobile communication system
JP2013507877A JP6312126B2 (ja) 2010-04-28 2011-04-26 移動通信システムにおけるｘ２インターフェース設定及びセルスイッチングのための装置及びその方法
CA2797418A CA2797418C (en) 2010-04-28 2011-04-26 Apparatus and method for x2 interface setup and cell switching in mobile communication system
RU2012145807/08A RU2595913C2 (ru) 2010-04-28 2011-04-26 Устройство и способ для установления х2-интерфейса и коммутации сот в системе мобильной связи
EP11775235.2A EP2564664B1 (en) 2010-04-28 2011-04-26 Apparatus and method for x2 interface setup and cell switching in mobile communication system

Applications Claiming Priority (2)

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CN201010159944.5A CN102238609B (zh) 2010-04-28 2010-04-28 X2接口建立方法和移动通信系统中小区切换方法
CN201010159944.5 2010-04-28

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WO2011136530A2 true WO2011136530A2 (en) 2011-11-03
WO2011136530A3 WO2011136530A3 (en) 2012-03-01

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EP (1) EP2564664B1 (enExample)
JP (1) JP6312126B2 (enExample)
KR (1) KR101751742B1 (enExample)
CN (2) CN102238609B (enExample)
AU (1) AU2011245876B2 (enExample)
CA (1) CA2797418C (enExample)
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US20110269464A1 (en) 2011-11-03
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