WO2010125956A1 - 移動通信システム - Google Patents

移動通信システム Download PDF

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Publication number
WO2010125956A1
WO2010125956A1 PCT/JP2010/057085 JP2010057085W WO2010125956A1 WO 2010125956 A1 WO2010125956 A1 WO 2010125956A1 JP 2010057085 W JP2010057085 W JP 2010057085W WO 2010125956 A1 WO2010125956 A1 WO 2010125956A1
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WO
WIPO (PCT)
Prior art keywords
base station
radio base
relay node
bearer
radio
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2010/057085
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English (en)
French (fr)
Japanese (ja)
Inventor
ウリ アンダルマワンティ ハプサリ
高橋　秀明
アニール ウメシュ
幹生 岩村
石井　美波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo 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 to BRPI1016124A priority Critical patent/BRPI1016124A2/pt
Priority to KR1020117026040A priority patent/KR101223997B1/ko
Priority to BR122013020169A priority patent/BR122013020169A2/pt
Priority to MX2011011390A priority patent/MX2011011390A/es
Priority to EP10769655.1A priority patent/EP2426994B1/en
Priority to CN2010800186674A priority patent/CN102415145A/zh
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to US13/266,482 priority patent/US8780861B2/en
Priority to CA2760024A priority patent/CA2760024A1/en
Publication of WO2010125956A1 publication Critical patent/WO2010125956A1/ja
Anticipated expiration legal-status Critical
Priority to US13/957,959 priority patent/US8761123B2/en
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
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • 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

  • the present invention relates to a mobile communication system.
  • a handover process of the mobile station UE from the radio base station eNB # 1 to the radio base station eNB # 2 is performed.
  • handover processing is performed between the radio base station eNB # 1 and the radio base station eNB # 2 via the X2 bearer set between the radio base station eNB # 1 and the radio base station eNB # 2. It is comprised so that the control signal which concerns on may be transmitted / received.
  • the radio base station eNB # 1 and the radio base station # 2 have a network layer 1 (NW L1) function and a network layer 2 (NW L2) as an X2 bearer function for setting up an X2 bearer. It has a function, an IP (Internet Protocol) layer function, and an SCTP (Stream Control Transmission Protocol) layer function.
  • NW L1 network layer 1
  • NW L2 network layer 2
  • IP Internet Protocol
  • SCTP Stream Control Transmission Protocol
  • a “relay node” having a function similar to that of the radio base station eNB is provided between the mobile station UE and the radio base station eNB.
  • RN can be connected.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a mobile communication system that can realize a handover process of a mobile station even when a relay node is connected.
  • a first feature of the present invention is a mobile communication system, in which a first relay node and a first radio base station are connected via a radio bearer, and the second relay node and the second radio base station are Connected via a radio bearer, the first radio base station and the second radio base station are connected via a bearer, and a mobile station establishes a radio bearer with the first relay node.
  • a radio bearer is set between the first relay node and the first relay node that is set and performing communication via the first relay node and the first radio base station, and the second relay node and the second relay node.
  • It is configured to perform a handover process with a second state in which communication is performed via a radio base station, and in the handover process, between the first relay node and the first radio base station.
  • Radio bearer of the first radio A control signal related to the handover process is transmitted and received via a bearer between a ground station and the second radio base station and a radio bearer between the second relay node and the second radio base station.
  • the first relay node when the first relay node receives a measurement report from the mobile station, the first relay node passes through a radio bearer between the first relay node and the first radio base station.
  • the first radio base station is configured to transfer the measurement report to the first radio base station, and the first radio base station is configured to transfer the second state from the first state of the mobile station based on the measurement report.
  • a handover request signal notifying that is used as a control signal related to the handover process
  • the second radio base station transmits the received handover request signal between the second relay node and the second radio base station. Radio bearer between Through, it may be configured to forward to the second relay node.
  • the first relay node when the first relay node decides to start a handover process from the first state to the second state of the mobile station, a handover request signal that notifies the fact Is transmitted to the first radio base station via a radio bearer between the first relay node and the first radio base station as a control signal related to the handover process,
  • the first radio base station is configured to transfer the received handover request signal to the second radio base station via a bearer between the first radio base station and the second radio base station.
  • the second radio base station transfers the received handover request signal to the second relay node via a radio bearer between the second relay node and the second radio base station. Ni It may be.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a protocol stack diagram in the mobile communication system according to the first embodiment of the present invention.
  • FIG. 3 is a sequence diagram showing operations of the mobile communication system according to the first embodiment of the present invention.
  • FIG. 4 is a protocol stack diagram in the mobile communication system according to the second embodiment of the present invention.
  • FIG. 5 is a sequence diagram showing operations of the mobile communication system according to the second embodiment of the present invention.
  • FIG. 6 is a protocol stack diagram in the mobile communication system according to the third embodiment of the present invention.
  • FIG. 7 is a sequence diagram showing operations of the mobile communication system according to the third embodiment of the present invention.
  • FIG. 8 is a protocol stack diagram in the current mobile communication system.
  • the mobile communication system according to the present invention is an LTE-Advanced mobile communication system, for example, as shown in FIG. 1, to which an exchange MME, relay nodes RN1 to RN4, and a relay node RN1 are connected.
  • a radio base station DeNB (Donor eNB) 1 a radio base station DeNB2 to which relay nodes RN2 and RN3 are connected, and a radio base station eNB1 are provided.
  • the radio base station DeNB1 and the radio base station DeNB2 are connected via the X2-C interface
  • the radio base station DeNB2 and the radio base station eNB1 are connected via the X2-C interface.
  • each of the radio base station DeNB1, the radio base station DeNB2, and the radio base station eNB1 is connected to the switching center MME via the S1-MME interface.
  • the mobile station UE is configured to perform radio communication by setting a radio bearer between the radio base station eNB (DeNB) and the relay node RN.
  • DeNB radio base station eNB
  • the mobile station UE sets up a radio bearer with the relay node RN1 (first relay node), and the relay node RN1 and the radio base station DeNB1.
  • a radio bearer is set between the state in which communication is performed via the (first radio base station) and the relay node RN2 (second relay node), and the relay node RN2 and the radio base station DeNB2 (second radio base station) )
  • the radio bearer (Un interface) between the relay node RN1 and the radio base station DeNB1, the bearer (X2-C interface) between the radio base station DeNB1 and the radio base station DeNB2, and the relay node RN2 A control signal (X2AP signal) related to the handover process is transmitted / received via a radio bearer (Un interface) between the radio base station DeNB2 and the radio base station DeNB2.
  • a radio bearer (Un interface) is not set between the relay node RN1 and the relay node RN2.
  • the relay node RN1 uses a physical (PHY) as an X2-C radio bearer function for setting up an X2-C radio bearer (Un interface) with the radio base station DeNB1.
  • a physical (PHY) as an X2-C radio bearer function for setting up an X2-C radio bearer (Un interface) with the radio base station DeNB1.
  • Layer function MAC (Media Access Control) layer function provided as upper layer function of physical (PHY) layer function, and RLC (Radio Link Control) layer function provided as upper layer function of MAC layer function
  • PDCP Packet Data Convergence Protocol
  • the relay node RN1 may include an RRC (Radio Resource Control) layer function provided as an upper layer function of the PDCP layer function.
  • RRC Radio Resource Control
  • the relay node RN1 is configured to perform security processing between the relay node RN1 and the radio base station DeNB1 as an upper layer function of the X2-C radio bearer function.
  • an SCTP layer function configured to perform keep-alive processing for the X2-C radio bearer as an upper layer function of the IP layer function.
  • the relay node RN1 may include an X2AP layer function configured to transmit and receive a control signal related to the handover process as an upper layer function of the SCTP layer function.
  • the relay node RN2 has a physical (PHY) layer function and a physical (PHY) as an X2-C radio bearer function for setting an X2-C radio bearer (Un interface) with the radio base station DeNB2.
  • MAC layer function provided as an upper layer function of the layer function
  • RLC layer function provided as an upper layer function of the MAC layer function
  • PDCP layer function provided as an upper layer function of the RLC layer function It has.
  • the relay node RN2 may have an RRC layer function provided as an upper layer function of the PDCP layer function.
  • the relay node RN2 includes an IP layer function configured to perform security processing between the relay node RN2 and the radio base station DeNB2, as an upper layer function of the X2-C radio bearer function, as an upper layer function, an SCTP layer function configured to perform a keep alive process for the X2-C radio bearer may be provided.
  • the relay node RN2 may include an X2AP layer function configured to transmit and receive a control signal related to the handover process as an upper layer function of the SCTP layer function.
  • the radio base station DeNB1 also configures an X2-C radio bearer function for setting an X2-C radio bearer (Un interface) with the relay node RN1 and a bearer (X2-C with the radio base station DeNB2).
  • a bearer function for setting the interface is also configured.
  • the radio base station DeNB1 has a network layer 1 (NW L1) function and a network layer 2 (NW L2) function as bearer functions.
  • the radio base station DeNB1 includes an X2-C radio bearer function and an IP layer function provided as an upper layer function of the bearer function, an SCTP function provided as an upper layer function of the IP layer function, and an SCTP layer function.
  • X2AP layer function provided as a higher layer function.
  • the radio base station DeNB2 configures an X2-C radio bearer function for setting an X2-C radio bearer (Un interface) with the relay node RN2, and a bearer (X2- C bearer function for setting (C interface).
  • the radio base station DeNB2 has a network layer 1 (NW L1) function and a network layer 2 (NW L2) function as bearer functions.
  • the radio base station DeNB2 includes an X2-C radio bearer function and an IP layer function provided as an upper layer function of the bearer function, an SCTP function provided as an upper layer function of the IP layer function, and an SCTP layer function.
  • X2AP layer function provided as a higher layer function.
  • the mobile station UE sets up a radio bearer with the relay node RN1, and performs communication via the relay node RN1 and the radio base station DeNB1.
  • a description will be given of an operation of performing a handover from a state in which a radio bearer is set to the relay node RN2 to a state in which communication is performed via the relay node RN2 and the radio base station DeNB2.
  • the relay node RN1 manages “UE Context” of the mobile station UE in step S1000, and in step S1001, the radio base station DeNB1 via the X2-C radio bearer. Then, the mobile station UE transmits “HO Request (handover request signal)” requesting handover from the relay node RN1 to the relay node RN2.
  • HO Request handover request signal
  • the radio base station DeNB1 When receiving the “HO Request” in the X2AP layer function, the radio base station DeNB1 stores “UE Context” of the mobile station UE in Step S1002, and in Step S1003, stores the “HO Request” in the X2-C radio. The data is transferred to the radio base station DeNB2 via the bearer.
  • the radio base station DeNB2 When receiving the “HO Request” in the X2AP layer function, the radio base station DeNB2 stores “UE Context” of the mobile station UE in Step S1004, and in Step S1005, stores the “HO Request” in the X2-C radio. The data is transferred to the relay node RN2 via the bearer.
  • the relay node RN2 When receiving the “HO Request”, the relay node RN2 stores “UE Context” of the mobile station UE in step S1006, and in step S1007, the radio base station DeNB2 via the X2-C radio bearer. “HO Request Ack (handover request confirmation signal)” is transmitted.
  • the radio base station DeNB2 When receiving the “HO Request Ack” in the X2AP layer function, the radio base station DeNB2 transfers the “HO Request Ack” to the radio base station DeNB1 via the X2-C radio bearer in step S1008.
  • the radio base station DeNB1 When the radio base station DeNB1 receives “HO Request Ack” in the X2AP layer function, in step S1009, the radio base station DeNB1 transfers the “HO Request Ack” to the relay node RN1 via the X2-C radio bearer.
  • step S1010 the relay node RN1 transmits “HO Command (handover instruction signal)” instructing the mobile station UE to perform handover to the relay node RN2 by the RRC layer function.
  • HO Command handover instruction signal
  • step S1011 the mobile station UE transmits “HO Complete (handover completion signal)” to the relay node RN2 by the RRC layer function.
  • step S1012 the relay node RN2 transmits a “Path Switch Request (path switching request signal)” to the switching center MME via the S1-MME interface.
  • step S1013 the switching center MME transmits a “Path Switch Request Ack (path switching request confirmation signal)” to the relay node RN2 via the S1-MME interface, and transfers a signal addressed to the mobile station UE.
  • the destination is switched from relay node RN1 to relay node RN2.
  • step S1014 the relay node RN2 transmits “UE Context Release” to the radio base station DeNB2 via the X2-C radio bearer.
  • step S1015 the radio base station DeNB2
  • the “UE Context Release” is transferred to the radio base station DeNB1 via the X2-C radio bearer.
  • step S1016 the radio base station DeNB1 performs the X2 ⁇ to the relay node RN1 in the X2AP layer function.
  • the “UE Context Release” is transferred via the C radio bearer, and the relay node RN1 ends the management of the “UE Context” of the mobile station UE according to the “UE Context Release”.
  • the relay node RN1 and the relay node RN2 may be switched, and the radio base station DeNB1 and the radio base station DeNB2 may be switched.
  • the X2AP layer function in the radio base station DeNB1 is the control signal (X2AP signal) related to the handover process between the relay note RN1 and the radio base station DeNB1, and between the radio base station DeNB1 and the radio base station DeNB2. It is configured to convert a control signal (X2AP signal) related to the handover process between them.
  • the X2AP layer function in the radio base station DeNB1 is used between the mobile station ID used between the relay note RN1 and the radio base station DeNB1, and between the radio base station DeNB1 and the radio base station DeNB2.
  • the mobile station ID is configured to be associated and managed.
  • the X2AP layer function in the radio base station DeNB2 is the control signal (X2AP signal) related to the handover process between the relay note RN2 and the radio base station DeNB2, and between the radio base station DeNB1 and the radio base station DeNB2.
  • the control signal (X2AP signal) related to the handover process is converted.
  • the X2AP layer function in the radio base station DeNB2 is used between the mobile station ID used between the relay note RN2 and the radio base station DeNB2, and between the radio base station DeNB1 and the radio base station DeNB2.
  • the mobile station ID is configured to be associated and managed.
  • the handover process related to the relay node RN is realized without significantly modifying the protocol stack of each device used in the LTE mobile communication system. be able to.
  • Mobile communication system according to the second embodiment of the present invention With reference to FIG.4 and FIG.5, the mobile communication system which concerns on the 2nd Embodiment of this invention is demonstrated.
  • the mobile communication system according to the second embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the first embodiment.
  • the relay node RN1 uses a physical (PHY) as an X2-C radio bearer function for setting up an X2-C radio bearer (Un interface) with the radio base station DeNB2.
  • a physical (PHY) as an X2-C radio bearer function for setting up an X2-C radio bearer (Un interface) with the radio base station DeNB2.
  • Layer function MAC layer function provided as upper layer function of physical (PHY) layer function, RLC layer function provided as upper layer function of MAC layer function, and upper layer function of RLC layer function
  • the provided PDCP layer function is a physical (PHY) as an X2-C radio bearer function for setting up an X2-C radio bearer (Un interface) with the radio base station DeNB2.
  • Layer function MAC layer function provided as upper layer function of physical (PHY) layer function
  • RLC layer function provided as upper layer function of MAC layer function
  • RLC layer function provided as upper layer function of RLC layer function
  • RLC layer function and upper layer function of RLC layer function
  • the relay node RN1 may have an RRC layer function provided as an upper layer function of the PDCP layer function.
  • the relay node RN1 is configured to operate as a proxy for the RRC layer function in the mobile station UE, and the relay node RN2 and the radio node function as an upper layer function of the X2-C radio bearer function.
  • IP layer function configured to perform security processing with the base station DeNB2
  • SCTP layer function configured to perform keep-alive processing for the X2-C radio bearer
  • control signal related to handover processing Does not have an X2AP layer function configured to transmit and receive.
  • protocol stacks of the radio base station DeNB1, the radio base station DeNB2, and the relay node RN2 are the same as the protocol stack of the mobile communication system according to the first embodiment shown in FIG.
  • the mobile station UE sets up a radio bearer with the relay node RN1, and performs communication via the relay node RN1 and the radio base station DeNB1.
  • a description will be given of an operation of performing a handover from a state in which a radio bearer is set to the relay node RN2 to a state in which communication is performed via the relay node RN2 and the radio base station DeNB2.
  • Step S2000 when the relay node RN1 receives “Measurement Report (measurement report)” from the mobile station UE in step S2000, the relay node RN1 acquires “UE Context” of the managed mobile station UE in step S2001. Then, in Step S2002, the “Measurement Report” including the “UE Context” of the mobile station UE is transferred to the radio base station DeNB1 by the RRC layer function.
  • the radio base station DeNB1 determines to perform a handover process from the relay node RN1 of the mobile station UE to the relay node RN2.
  • the “UE Context” of the mobile station UE is determined.
  • “HO Request (handover request signal)” for requesting handover of the mobile station UE from the relay node RN1 to the relay node RN2 is sent to the radio base station DeNB2 with the X2-C radio bearer. Send through.
  • the radio base station DeNB2 Upon receiving “HO Request” in the X2AP layer function, the radio base station DeNB2 stores “UE Context” of the mobile station UE in step S2005, and in step S2006, the radio base station DeNB2 transmits the X2-C radio to the relay node RN2. “HO Request” is transferred through the bearer.
  • the relay node RN2 When receiving the “HO Request”, the relay node RN2 stores “UE Context” of the mobile station UE in Step S2007, and in Step S2008, the radio base station DeNB2 via the X2-C radio bearer, “HO Request Ack (handover request confirmation signal)” is transmitted.
  • the radio base station DeNB2 When the radio base station DeNB2 receives “HO Request Ack” in the X2AP layer function, in step S2009, the radio base station DeNB2 transfers “HO Request Ack” to the radio base station DeNB1.
  • the radio base station DeNB1 When the radio base station DeNB1 receives “HO Request Ack”, in step S2010, the radio base station DeNB1 instructs the relay node RN1 to perform handover to the relay node RN2 by the RRC layer function. “HO Command (handover instruction signal)” Send.
  • step S2011 the relay node RN1 transfers the received “HO Command” to the mobile station UE by the RRC layer function.
  • step S2012 the mobile station UE transmits “HO Complete (handover completion signal)” to the relay node RN2 by the RRC layer function.
  • step S2013 the relay node RN2 transmits a “Path Switch Request (path switching request signal)” to the switching center MME via the S1-MME interface.
  • step S2014 the switching center MME transmits a “Path Switch Request Ack (path switching request confirmation signal)” to the relay node RN2 via the S1-MME interface, and transfers a signal addressed to the mobile station UE.
  • the destination is switched from relay node RN1 to relay node RN2.
  • step S2015 the relay node RN2 transmits “UE Context Release” to the radio base station DeNB2 via the X2-C radio bearer.
  • step S2016 the radio base station DeNB2 uses the X2AP layer function to The “UE Context Release” is transferred to the radio base station DeNB1 via the X2-C radio bearer.
  • step S2017 the radio base station DeNB1 transfers “RRC Connection Release” to the relay node RN1 in the RRC layer function, and the relay node RN1 responds to the “RRC Connection Release” according to “ Management of “UE Context” is terminated.
  • Mobile communication system according to the third embodiment of the present invention With reference to FIG.6 and FIG.7, the mobile communication system which concerns on the 3rd Embodiment of this invention is demonstrated.
  • the mobile communication system according to the third embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the first embodiment.
  • the radio base station DeNB1 includes an X2-C radio bearer function for setting an X2-C radio bearer (Un interface) with the relay node RN1, and a radio base station.
  • the radio base station DeNB1 has a network layer 1 (NW L1) function and a network layer 2 (NW L2) function as bearer functions.
  • the radio base station DeNB1 has an IP layer function as an upper layer function of the X2-C radio bearer function and a bearer function, but has an SCTP function and an X2AP layer function as an upper layer function of the IP layer function. Not done.
  • the radio base station DeNB2 configures an X2-C radio bearer function for setting an X2-C radio bearer (Un interface) with the relay node RN2, and a bearer (X2- C bearer function for setting (C interface).
  • the radio base station DeNB2 has a network layer 1 (NW L1) function and a network layer 2 (NW L2) function as bearer functions.
  • the radio base station DeNB2 has an IP layer function as an upper layer function of the X2-C radio bearer function and a bearer function, but has an SCTP function and an X2AP layer function as an upper layer function of the IP layer function. Not done.
  • protocol stacks of the relay node RN1 and the relay node RN2 are the same as the protocol stack of the mobile communication system according to the first embodiment shown in FIG.
  • the mobile station UE sets up a radio bearer with the relay node RN1, and performs communication via the relay node RN1 and the radio base station DeNB1.
  • a description will be given of an operation of performing a handover from a state in which a radio bearer is set to the relay node RN2 to a state in which communication is performed via the relay node RN2 and the radio base station DeNB2.
  • the relay node RN1 manages “UE Context” of the mobile station UE in step S3000.
  • the relay node RN1 transmits the radio base station DeNB1 via the X2-C radio bearer. Then, the mobile station UE transmits “HO Request (handover request signal)” requesting handover from the relay node RN1 to the relay node RN2.
  • HO Request handover request signal
  • the radio base station DeNB1 When receiving the “HO Request” in step S3002 by the IP layer function, the radio base station DeNB1 transfers the “HO Request” to the radio base station DeNB2 via the X2-C radio bearer in step S3003. .
  • the radio base station DeNB2 When the radio base station DeNB2 receives the “HO Request” in step S3004 by the IP layer function, the radio base station DeNB2 transfers the “HO Request” to the relay node RN2 via the X2-C radio bearer in step S3005.
  • the relay node RN2 When receiving the “HO Request”, the relay node RN2 stores “UE Context” of the mobile station UE in Step S3006, and in Step S3007, the radio base station DeNB2 via the X2-C radio bearer, “HO Request Ack (handover request confirmation signal)” is transmitted.
  • the radio base station DeNB2 When receiving the “HO Request Ack” in step S3008 by the IP layer function, the radio base station DeNB2 transmits the “HO Request Ack” to the radio base station DeNB1 via the X2-C radio bearer in step S3009. Forward.
  • the radio base station DeNB1 When receiving “HO Request Ack” in step S3010 by the IP layer function, the radio base station DeNB1 transfers the “HO Request Ack” to the relay node RN1 via the X2-C radio bearer in step S3011. To do.
  • step S3012 the relay node RN1 transmits “HO Command (handover instruction signal)” instructing the mobile station UE to perform handover to the relay node RN2 by the RRC layer function.
  • HO Command handover instruction signal
  • step S3013 the mobile station UE transmits “HO Complete (handover completion signal)” to the relay node RN2 by the RRC layer function.
  • step S3014 the relay node RN2 transmits a “Path Switch Request (path switching request signal)” to the switching center MME via the S1-MME interface.
  • step S3015 the switching center MME transmits a “Path Switch Request Ack (path switching request confirmation signal)” to the relay node RN2 via the S1-MME interface and transfers a signal addressed to the mobile station UE.
  • the destination is switched from relay node RN1 to relay node RN2.
  • step S3016 the relay node RN2 transmits “UE Context Release” to the radio base station DeNB2 via the X2-C radio bearer.
  • the radio base station DeNB2 When receiving the “UE Context Release” in step S3017 by the I layer function, the radio base station DeNB2 receives “UE Context Release” via the X2-C radio bearer to the radio base station DeNB1 in step S3018. Forward.
  • the radio base station DeNB1 When receiving the “UE Context Release” in step S3019 by the I layer function, the radio base station DeNB1 sends “UE Context Release” to the relay node RN1 via the X2-C radio bearer in step S3020. Then, the relay node RN1 ends the management of the “UE Context” of the mobile station UE in accordance with the “UE Context Release”.
  • the operations of the mobile station UE, the relay node RN, the radio base station eNB, and the switching center MME described above may be performed by hardware, may be performed by a software module executed by a processor, or both. It may be implemented by a combination of
  • Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
  • the storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the relay node RN, the radio base station eNB, or the exchange MME. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the relay node RN, the radio base station eNB, or the exchange MME.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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EP10769655.1A EP2426994B1 (en) 2009-04-27 2010-04-21 Mobile communication system
CN2010800186674A CN102415145A (zh) 2009-04-27 2010-04-21 移动通信系统
BRPI1016124A BRPI1016124A2 (pt) 2009-04-27 2010-04-21 sistema de comunicação móvel
US13/266,482 US8780861B2 (en) 2009-04-27 2010-04-21 Mobile communication system
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