WO2014157518A1 - Pdnゲートウェイ装置及び移動通信方法 - Google Patents
Pdnゲートウェイ装置及び移動通信方法 Download PDFInfo
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- WO2014157518A1 WO2014157518A1 PCT/JP2014/058860 JP2014058860W WO2014157518A1 WO 2014157518 A1 WO2014157518 A1 WO 2014157518A1 JP 2014058860 W JP2014058860 W JP 2014058860W WO 2014157518 A1 WO2014157518 A1 WO 2014157518A1
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- source
- serving gateway
- gateway device
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- base station
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010295 mobile communication Methods 0.000 title claims abstract description 25
- 239000003550 marker Substances 0.000 claims abstract description 127
- 238000012546 transfer Methods 0.000 claims abstract description 82
- 230000007704 transition Effects 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims description 58
- 230000005641 tunneling Effects 0.000 claims description 7
- 238000005538 encapsulation Methods 0.000 claims description 5
- 238000012163 sequencing technique Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 230000007423 decrease Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 239000000872 buffer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/12—Reselecting a serving backbone network switching or routing node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
Definitions
- the present invention relates to a PDN gateway device and a mobile communication method for transferring downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device.
- Non-Patent Document 1 A method for transmitting an end marker from a serving gateway device to a source radio base station of a transition source is defined (for example, Non-Patent Document 1).
- FIG. 1 shows a handover procedure of a mobile station in a conventional radio access network. Specifically, FIG. 1 shows a handover procedure defined in Section 5.5.1.1.2 (X2-based handover without Serving GW relocation) of 3GPP TS23.401.
- the Source eNB (source radio base station) communicates with the handover destination Target eNB (target radio base station) to the network, specifically, P- Forward the downlink data addressed to the UE received from the GW (PDN gateway device) (Forwarding of data) ((1) in the figure).
- GW PDN gateway device
- the S-GW serving gateway device
- Target eNB downlink data (Fresh Data) destined for the UE
- the S-GW transmits the end marker to the Source eNB after switching the connection destination of the downlink data transfer path from the Source eNB to the Target eNB, and the Source eNB that has received the end marker transmits to the Target eNB. Transfer end marker.
- Target eNB once buffers the downlink data (Fresh Data) received from S-GW and receives the end marker from Source eNB to ensure the ordering of downlink data transmitted to the UE That is, after confirming that there is no downlink data (Forwarding Data) transferred from Source eNB, downlink data (Fresh Data) is transferred to the UE.
- Downlink data Form Data
- 3GPP (23.401) V9.13.0 (Section 4.4.3.2) Serving (GW), (3rd) Generation (Partnership) Project; (Technical) Specification (Group) Services (and System) Aspects; (General) Packet (Radio) Service (GPRS) (enhancements) for (Evolved) Universal (Terrestrial) Access Retransmission (U) , 3GPP, June 2012
- the mobile station handover procedure in the above-described conventional radio access network has the following problems. Specifically, since the radio base station is managed by a specific S-GW, the S-GW that manages the Source eNB differs from the S-GW that manages the Target eNB (S-GW Relocation) Can occur.
- the S-GW source serving gateway device
- the S-GW that manages the Source eNB cannot recognize the downlink data transfer path set as the Target eNB. For this reason, the S-GW that manages Source eNB cannot determine the end marker transmission timing and cannot transmit the end marker. Therefore, when such a handover is performed such that the S-GWs that manage the radio base stations are different, the Target eNB cannot guarantee the order of the downlink data.
- the Target eNB implements a timer and forwards downlink data (Fresh Data) received from the S-GW to the mobile station (UE) after the timer expires.
- Fresh Data downlink data
- the set time of the timer is shortened, the possibility that downlink data (Forwarding ⁇ ⁇ Data) will be transferred from Source eNB after the start of downlink data (Fresh Data) transfer to the UE increases, and the order of downlink data Guarantee becomes difficult.
- the number of data retransmissions in the higher layer increases, and as a result, the downlink data throughput decreases.
- the waiting time from the completion of the transfer of the downlink data (Forwarding Data) to the UE after the completion of the transfer of the downlink data (Forwarding Data) to the UE may increase.
- the downstream data throughput decreases.
- the present invention has been made in view of such a situation, and serves as a serving gateway apparatus that manages a radio base station that is a transition source of a mobile station, and a serving that manages a radio base station that is a transition destination of the mobile station.
- An object of the present invention is to provide a PDN gateway apparatus and a mobile communication method that can guarantee the order of downlink data while avoiding a decrease in downlink data throughput even when the gateway apparatus is different.
- a first feature of the present invention is a PDN gateway device that forwards downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, from the source radio base station to the target radio base station of the mobile station
- a path setting unit that sets a downlink data transfer path via the target serving gateway device and the target radio base station with the target serving gateway device, and the source radio base with the transition.
- the serving gateway device is switched from the source serving gateway device that manages the station to the target serving gateway device that manages the target radio base station, it means that the transfer of the downlink data via the source radio base station ends.
- the end marker which, depending on the setting of the downlink data transfer path by the path setting unit, and summarized in that with an end marker transmitting unit that transmits to the source serving gateway apparatus.
- a second feature of the present invention is a PDN gateway device that forwards downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station being a target radio base station
- a path setting unit that sets a downlink data transfer path via the target serving gateway device and the target radio base station with the target serving gateway device, and the source radio base with the transition.
- the serving gateway device is switched from the source serving gateway device that manages the station to the target serving gateway device that manages the target radio base station, it means that the transfer of the downlink data via the source radio base station ends.
- a transmission instruction of end marker which, depending on the setting of the downlink data transfer path by the path setting unit, and summarized in that and a transmission instruction unit that transmits to the source serving gateway apparatus.
- a third feature of the present invention is a mobile communication method for transferring downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station to a target radio base station Along with the transition, a step of setting a downlink data transfer path via the target serving gateway device and the target radio base station between the target serving gateway device and the PDN gateway device, and along with the transition
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station, the PDN gateway apparatus Transmitting an end marker indicating the end of transfer of the downlink data via a radio base station to the source serving gateway device according to the setting of the downlink data transfer path; and the source serving gateway device includes the PDN And transferring the end marker received from the gateway device to the source radio base station.
- a fourth feature of the present invention is a mobile communication method for transferring downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station to a target radio base station Along with the transition, a step of setting a downlink data transfer path via the target serving gateway device and the target radio base station between the target serving gateway device and the PDN gateway device, and along with the transition
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station
- the PDN gateway apparatus A step of transmitting an end marker transmission instruction indicating the end of transfer of the downlink data via a radio base station to the source serving gateway apparatus according to the setting of the downlink data transfer path; and And transferring the end marker to the source radio base station based on the transmission instruction received from the PDN gateway device.
- FIG. 1 is a diagram illustrating a handover procedure of a mobile station in a conventional radio access network according to an embodiment of the present invention.
- FIG. 2 is an overall schematic configuration diagram of the mobile communication system 10 according to the embodiment of the present invention.
- FIG. 3 is a functional block configuration diagram of the P-GW 60 according to the first embodiment of the present invention.
- FIG. 4 is a functional block configuration diagram of the S-GW 50 according to the first embodiment of the present invention.
- FIG. 5 is a diagram illustrating a handover procedure of the UE 20 according to the operation example 1 of the first embodiment of the present invention.
- FIG. 6 is a conceptual diagram showing the downlink data and end marker transfer paths when the handover procedure is executed in the operation example 1 of the first embodiment of the present invention.
- FIG. 1 is a diagram illustrating a handover procedure of a mobile station in a conventional radio access network according to an embodiment of the present invention.
- FIG. 2 is an overall schematic configuration diagram of the mobile communication system 10 according to the embodiment of the
- FIG. 7 is a diagram illustrating a handover procedure of the UE 20 according to the operation example 2 of the first embodiment of the present invention.
- FIG. 8 is a functional block configuration diagram of the P-GW 60 according to the second embodiment of the present invention.
- FIG. 9 is a functional block configuration diagram of the S-GW 50 according to the second embodiment of the present invention.
- FIG. 10 is a diagram illustrating a handover procedure of the UE 20 according to the operation example 1 of the second embodiment of the present invention.
- FIG. 11 is a diagram illustrating a handover procedure of the UE 20 according to the operation example 2 of the second embodiment of the present invention.
- FIG. 2 is an overall schematic configuration diagram of the mobile communication system 10 according to the first embodiment of the present invention.
- a mobile station 20 hereinafter referred to as UE20
- a radio base station 30 hereinafter referred to as eNB30
- MME40 mobility management device
- S-GW50 serving gateway device 50
- P-GW60 PDN gateway device 60
- PCRF70 policy / billing control device
- the mobile communication system 10 may include a home subscriber server (HSS), and the P-GW 60 includes an IP-based external network (packet data network) such as an IP multimedia core network subsystem (IMS). Connected.
- IMS IP multimedia core network subsystem
- the MME40 is an exchange that accommodates eNB30 and provides mobility control and bearer control functions.
- the S-GW 50 accommodates a 3GPP (LTE) access system. Specifically, the S-GW 50 manages the eNB 30 that matches the conditions according to the conditions such as the installation area (for example, the northern Japan area and the eastern Japan area). That is, the S-GW 50 can manage a plurality of eNBs 30 and each of the eNBs 30 is associated with a specific S-GW 50.
- LTE 3GPP
- the S-GW 50 that manages the handover source radio base station is referred to as a Source S-GW (source serving gateway device), and the handover destination radio base station
- the S-GW 50 that manages the (target radio base station) is called Target S-GW (target serving gateway device).
- P-GW60 is a connection point with the packet data network (PDN), and assigns IP addresses and transfers packets to the S-GW50.
- PDN packet data network
- the P-GW 60 transfers downlink data addressed to the UE 20 toward the S-GW 50.
- the P-GW 60 transfers downlink data addressed to the UE 20 toward the Source S-GW or Target S-GW.
- P-GW60 performs QoS control and bearer setting control in cooperation with PCRF70.
- the PCRF 70 executes control for QoS and charging for user data transfer.
- GTP GPRS tunneling protocol
- PMIPv6 Proxy Mobile IPv6
- GTPv1 GTPv1 that operates on the user plane (U-Plane)
- GTPv2 GTPv2 that operates on the control plane (C-Plane)
- PMIPv6 a Generic Routing Encapsulation protocol that operates on the user plane (U-Plane) and PMIP that operates on the control plane (C-Plane) are used.
- FIG. 3 is a functional block configuration diagram of the P-GW60.
- FIG. 4 is a functional block configuration diagram of the S-GW50. Note that in FIG. 3 and FIG. 4, only functional blocks related to the present invention are shown, and other functional blocks are not shown.
- the P-GW 60 includes a path setting unit 61 and an end marker transmission unit 63.
- the path setting unit 61 sets a data transfer path set between the UE 20 and the P-GW 60 via the eNB 30 and the S-GW 50. Specifically, the path setting unit 61 sets a path capable of transferring uplink and downlink data between the UE 20 and the P-GW 60.
- the path setting unit 61 sets the downlink data transfer path via Target S-GW and Target eNB as Target S-GW along with the transition from Source eNB to Target eNB of UE20. .
- the end marker transmission unit 63 transmits an end marker to the Source eNB when the UE 20 is handed over to another radio base station.
- the end marker means the end of downlink data transfer via the Source eNB when the UE 20 is handed over.
- the end marker transmission unit 63 switches the S-GW 50 from the Source S-GW that manages the Source eNB to the Target S S-GW that manages the Target ⁇ eNB in accordance with a transition such as a handover of the UE 20. Send the end marker to Source ⁇ eNB.
- the end marker transmission unit 63 transmits an end marker to the Source S-GW according to the setting of the downlink data transfer path by the path setting unit 61.
- the end marker transmission unit 63 transmits the end marker to the Source S-GW without delay.
- the UE 20 is switched, for example, when the S-GW 50 is switched from the Source S-GW that manages the Source eNB to the Target S-GW that manages the Target eNB, ENB30 (Target eNB) located near the boundary of the area (for example, Northern Japan) managed by other S-GW50 from the connected eNB30 (Source eNB) located near the boundary of the area (for example, Eastern Japan) managed by Typically, a handover is performed.
- the end marker transmission unit 63 can transmit the end marker to the Source S-GW via a user plane set according to the GPRS tunneling protocol (GTP) between the Source S-GW and the P-GW 60.
- the end marker transmission unit 63 may transmit the end marker to the Source S-GW via the user plane set according to the Generic Routing Encapsulation (GRE) protocol between the Source S-GW and the P-GW 60. it can. That is, the end marker transmission unit 63 sets the end marker as Source S-GW regardless of which of the two types of protocols (GTP, PMIP) defined for the S5 or S8 interface defined in 3GPP is used. Can be sent to.
- GTP GPRS tunneling protocol
- PMIP Generic Routing Encapsulation
- the S-GW 50 includes an end marker receiving unit 51 and an end marker transfer unit 53.
- the end marker receiving unit 51 receives an end marker from the P-GW 60 when the S-GW 50 is operating as a Source S-GW. Further, the end marker receiving unit 51 confirms that the received end marker is addressed to its own device (Source S-GW), and outputs the end marker to the end marker transfer unit 53.
- the end marker transfer unit 53 transfers the end marker received from the P-GW 60 to Target eNB. Specifically, the end marker transfer unit 53 transfers the end marker output from the end marker reception unit 51 to Target eNB.
- FIG. 5 shows a handover procedure of UE 20 according to Operation Example 1.
- FIG. 5 is a modification of the handover procedure shown in FIG. 5.5.1.1.3-1 (X2-based handover with Serving GW relocation) of 3GPP TS23.401.
- GTP is used as the S5 / S8 interface.
- FIG. 6 is a conceptual diagram showing the downlink data and end marker transfer paths when the handover procedure in Operation Example 1 is executed.
- the P-GW 60 that can recognize the switching of the downlink data transfer path transmits the end marker. Specifically, when P-GW60 receives Modify Bearer Request from Target S-GW (Step 3a), P-GW60 transmits Modify Bearer Response to Target S-GW in response to the received Modify Bearer Request (Step 3b). ). By such processing, a downlink data transfer path via P-GW60, Target S-GW and Target eNB is set, and P-GW60 transmits downlink data (data # 4 in FIG. 6) to Target S-GW. 5) is started.
- P-GW60 sends an end marker to Source S-GW. Specifically, the P-GW 60 ends the transfer to the Source S-GW after completing the transfer of the downlink data (data # 1, 2, 3 in FIG. 6) via the Source S-GW, that is, the Source SNB. A marker (“E” in FIG. 6) is transmitted (step 5X).
- the Source S-GW that has received the end marker transfers the downlink data (data # 1, 2, 3) and the end marker transferred from the P-GW 60 to the Source eNB. Further, the Source eNB that has received the downlink data (data # 1, 2, 3) and the end marker transfers the downlink data and the end marker to the Target eNB (step 5Y).
- the Target eNB performs the ordering of the downlink data (data # 1, 2, 3) received via the Source S-GW and the downlink data (# 4, 5) received via the Target S-GW. It can be transferred to the UE 20 while guaranteeing (see FIG. 6).
- FIG. 7 shows a handover procedure of UE 20 according to Operation Example 2. Specifically, Figure 7 shows changes made to the handover procedure shown in Figure 5.7.1-1 (Intra-LTE and Inter-eNodeB Handover with Serving GW Relocation) of 3GPP TS23.402 (V9.12.0) It is a thing.
- PMIP is used as the S5 / S8 interface.
- the P-GW 60 that can recognize the switching of the downlink data transfer path transmits the end marker in the same manner as in the operation example 1.
- PMIP is used.
- the end marker is only GTPv1 operating on the user plane (U-Plane), so the end marker is used as a signal according to the GRE protocol. Expanded to allow transmission.
- P-GW60 executes Target S-GW (new S-GW) and Proxy Binding Update processing (step A.3, A.4), and then sets an end marker in Source S-GW (old S-GW). Send (step M.1). As described above, the end marker is transmitted to the Source S-GW as a signal according to the GRE protocol.
- new-S-GW corresponds to Target S-GW
- old S-GW corresponds to Source S-GW.
- the Source S-GW that received the end marker sends an end marker to eNB30 (Source eNB) together with the execution of Gateway Control Session Termination Procedure (Step B.1) that terminates the Control Session with PCRF70 (h-PCRF). Send (step M.2).
- the end marker may be transmitted to the eNB 30 (Source (eNB) before or after the GatewayGateControl Session Termination Procedure.
- eNB30 (Source eNB) transfers the end marker to Target eNB in the same manner as in Operation Example 1.
- Target eNB can transfer the downlink data received via Source S-GW and the downlink data received via Target S-GW to UE 20 while ensuring the order.
- the source S-GW that manages the Source eNB is changed from the Source S-GW that manages the Source eNB to the Target S-GW that manages the Target eNB along with the handover of the UE 20 or the like.
- P-GW60 which can recognize switching of the downlink data transfer path, sets an end marker that means the end of downlink data transfer via the Source eNB to the downlink data transfer path setting with Target S-GW.
- send to Source S-GW send to Source S-GW.
- the Source S-GW transfers the end marker received from the P-GW 60 to the Target eNB via the Source eNB.
- FIG. 8 is a functional block configuration diagram of the P-GW60.
- FIG. 9 is a functional block configuration diagram of the S-GW50.
- the configuration of the mobile communication system 10 according to the present embodiment is the same as that of the first embodiment (see FIG. 2). 8 and 9, it should be noted that only functional blocks related to the present invention are shown, and other functional blocks are not shown.
- the P-GW 60 includes a path setting unit 61 and a transmission instruction unit 65.
- the path setting unit 61 is the same as in the first embodiment.
- the transmission instruction unit 65 transmits an end marker transmission instruction to the Source S-GW. Specifically, when the S-GW 50 is switched from the Source S-GW to the Target ⁇ S-GW due to a transition such as a handover of the UE 20, the transmission instruction unit 65 sends an end marker transmission instruction to the Target by the path setting unit 61. Transmit to Source S-GW according to the setting of downlink data transfer path with S-GW.
- the transmission instruction unit 65 can transmit an end marker transmission instruction to the Source S-GW via the control plane set according to the GPRS tunneling protocol (GTP) between the Source S-GW and the P-GW 60. Further, the transmission instruction unit 65 can also transmit an end marker transmission instruction to the Source S-GW as a signal according to Proxy Mobile IPv6 (PMIPv6) between the Source S-GW and the P-GW 60.
- GTP GPRS tunneling protocol
- PMIPv6 Proxy Mobile IPv6
- the S-GW 50 includes a transmission instruction receiving unit 55 and an end marker transmitting unit 57.
- the transmission instruction receiving unit 55 receives an end marker transmission instruction from the P-GW 60 when the S-GW 50 is operating as a Source S-GW. Also, the transmission instruction receiving unit 55 confirms that the received transmission instruction of the end marker is addressed to its own device (Source S-GW), and outputs the transmission instruction of the end marker to the end marker transmission unit 57.
- the end marker transmission unit 57 generates an end marker based on the end marker transmission instruction received from the P-GW 60, and transmits the generated end marker to the Target eNB.
- FIG. 10 shows a handover procedure of UE 20 according to Operation Example 1. Specifically, FIG. 10 is a modification of the handover procedure shown in Figure 5.5.1.1.3-1 (X2-based handover with Serving GW relocation) of 3GPP TS23.401. In operation example 1, GTP is used as the S5 / S8 interface.
- the P-GW 60 transmits an end marker transmission instruction to the Source S-GW instead of transmitting the end marker (step 5X).
- the Source S-GW Upon receiving the end marker transmission instruction, the Source S-GW generates an end marker, and transfers the downlink data and end marker transferred from the P-GW 60 to the Source eNB. Further, the Source eNB that has received the downlink data and the end marker transfers the downlink data and the end marker to the Target eNB (step 5Y).
- end marker may be an extension of an existing GTPv2 signal or a new GTPv2 signal.
- FIG. 11 shows a handover procedure of UE 20 according to Operation Example 2.
- FIG. 11 is a modification of the handover procedure shown in Figure 5.7.1-1 (Intra-LTE and Inter-eNodeB Handover with Serving GW Relocation) of 3GPP TS23.402 (V9.12.0). It is a thing.
- PMIP is used as the S5 / S8 interface.
- the P-GW 60 transmits an end marker transmission instruction to the Source S-GW instead of transmitting the end marker (step M.11).
- the end marker transmission instruction may be an extension of an existing PMIPv6 signal or a new PMIPv6 signal.
- the Source S-GW that has received the instruction to send the end marker sends an eNB30 (Source eNB) together with the execution of Gateway Control Session Termination Procedure (Step B.1) that terminates the Control Session with PCRF70 (h-PCRF). Send an end marker (step M.12).
- the transmission of the end marker transmission instruction to the eNB 30 (Source eNB) may be performed before or after the Gateway Control Session Termination Procedure.
- the X2over handover has been described as an example, but the same procedure can be applied not only to the X2R handover but also to the S1 handover and the Inter-RAT handover.
- a first feature of the present invention is a P-GW60 (PDN gateway device) that forwards downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, and the source radio base station of the mobile station
- a path setting unit 61 path setting unit that sets a downlink data transfer path passing through the target serving gateway device and the target radio base station with the target serving gateway device in accordance with the transition from the target radio base station to the target radio base station;
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station with the transition, the source radio base station passes through the source radio base station.
- An end marker transmitting unit 63 end marker transmitting unit that transmits an end marker that means the end of data transfer to the source serving gateway device according to the setting of the downlink data transfer path by the path setting unit. Is the gist.
- the end marker transmitting unit transmits the end marker to the source serving via a user plane set according to a GPRS tunneling protocol between the source serving gateway device and the PDN gateway device. You may transmit to a gateway apparatus.
- the end marker transmission unit sends the end marker to the source via a user plane set in accordance with a Generic Routing Encapsulation protocol between the source serving gateway device and the PDN gateway device. You may transmit to a serving gateway apparatus.
- a second feature of the present invention is a P-GW60 (PDN gateway device) that forwards downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station
- a path setting unit 61 path setting unit
- path setting unit sets a downlink data transfer path passing through the target serving gateway device and the target radio base station with the target serving gateway device in accordance with the transition from the target radio base station to the target radio base station;
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station with the transition, the source radio base station passes through the source radio base station.
- a transmission instruction unit 65 (transmission instruction unit) that transmits an end marker transmission instruction that means the end of data transfer end to the source serving gateway device according to the setting of the downlink data transfer path by the path setting unit;
- the gist is to provide.
- the end marker transmitting unit transmits the end marker to the source serving via a user plane set according to a GPRS tunneling protocol between the source serving gateway device and the PDN gateway device. You may transmit to a gateway apparatus.
- the end marker transmission unit sends the end marker to the source via a user plane set in accordance with a Generic Routing Encapsulation protocol between the source serving gateway device and the PDN gateway device. You may transmit to a serving gateway apparatus.
- a third feature of the present invention is a mobile communication method for transferring downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station to a target radio base station Along with the transition, a step of setting a downlink data transfer path via the target serving gateway device and the target radio base station between the target serving gateway device and the PDN gateway device, and along with the transition
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station, the PDN gateway apparatus Transmitting an end marker indicating the end of transfer of the downlink data via a radio base station to the source serving gateway device according to the setting of the downlink data transfer path; and the source serving gateway device includes the PDN And transferring the end marker received from the gateway device to the source radio base station.
- a fourth feature of the present invention is a mobile communication method for transferring downlink data addressed to a mobile station toward a source serving gateway device or a target serving gateway device, the source radio base station of the mobile station to a target radio base station Along with the transition, a step of setting a downlink data transfer path via the target serving gateway device and the target radio base station between the target serving gateway device and the PDN gateway device, and along with the transition
- the serving gateway apparatus switches from the source serving gateway apparatus that manages the source radio base station to the target serving gateway apparatus that manages the target radio base station
- the PDN gateway apparatus A step of transmitting an end marker transmission instruction indicating the end of transfer of the downlink data via a radio base station to the source serving gateway apparatus according to the setting of the downlink data transfer path; and And transferring the end marker to the source radio base station based on the transmission instruction received from the PDN gateway device.
- the serving gateway apparatus that manages the radio base station that is the transition source of the mobile station and the serving gateway apparatus that manages the radio base station that is the transition destination of the mobile station are different, It is possible to provide a PDN gateway apparatus and a mobile communication method that can guarantee the order of downlink data while avoiding a decrease in throughput.
Abstract
Description
(1)移動通信システムの全体概略構成
図2は、本発明の第1実施形態に係る移動通信システム10の全体概略構成図である。図3に示すように、移動局20(以下、UE20)、無線基地局30(以下、eNB30)、移動管理装置(以下、MME40)、サービングゲートウェイ装置50(以下、S-GW50)、PDNゲートウェイ装置60(以下、P-GW60)、及びポリシー・課金制御装置(以下、PCRF70)を含む。また、移動通信システム10には、ホーム加入者サーバ(HSS)が含まれてもよく、P-GW60には、IP Multimedia core network Subsystem(IMS)などのIPベースの外部ネットワーク(パケットデータネットワーク)が接続される。
次に、移動通信システム10の機能ブロック構成について説明する。具体的には、S-GW50及びP-GW60の機能ブロック構成について説明する。図3は、P-GW60の機能ブロック構成図である。また、図4は、S-GW50の機能ブロック構成図である。なお、図3及び図4では、本発明に関連する機能ブロックのみ図示し、他の機能ブロックについては図示していないことに留意されたい。
図3に示すように、P-GW60は、パス設定部61及びエンドマーカ送信部63を備える。
図4に示すように、S-GW50は、エンドマーカ受信部51及びエンドマーカ転送部53を備える。
次に、移動通信システム10の動作について説明する。具体的には、Source S-GWからTarget S-GWにS-GW50が切り替わる場合におけるUE20のハンドオーバ手順について説明する。上述したように、Source S-GWからTarget S-GWにS-GW50が切り替わる場合としては、UE20が、Source S-GWが管理するエリア(例えば、東日本)の境界付近に位置する接続中のeNB30(Source eNB)から、他のS-GW50が管理するエリア(例えば、北日本)の境界付近に位置するeNB30(Target eNB)にハンドオーバした場合が挙げられる。
図5は、動作例1に係るUE20のハンドオーバ手順を示す。具体的には、図5は、3GPP TS23.401のFigure 5.5.1.1.3-1(X2-based handover with Serving GW relocation)に示されているハンドオーバ手順に変更を加えたものである。動作例1では、S5/S8インターフェースとしてGTPが用いられる。また、図6は、動作例1におけるハンドオーバ手順が実行された場合における下りデータ及びエンドマーカの転送経路を示す概念図である。
図7は、動作例2に係るUE20のハンドオーバ手順を示す。具体的には、図7は、3GPP TS23.402(V9.12.0)のFigure 5.7.1-1(Intra-LTE and Inter-eNodeB Handover with Serving GW Relocation)に示されているハンドオーバ手順に変更を加えたものである。動作例2では、S5/S8インターフェースとしてPMIPが用いられる。
本実施形態に係る移動通信システム10によれば、UE20のハンドオーバなどの遷移に伴って、Source eNBを管理するSource S-GWからTarget eNBを管理するTarget S-GWにS-GW50が切り替わる場合、下りデータ転送パスの切り替えを認識できるP-GW60が、Source eNBを経由した下りデータの転送終了を意味するエンドマーカを、Target S-GWとの下りデータ転送パスの設定に応じてSource S-GWに送信する。また、Source S-GWは、P-GW60から受信したエンドマーカをSource eNBを経由してTarget eNBに転送する。
次に、本発明の第2実施形態について説明する。本実施形態では、P-GW60によるエンドマーカの送信に代えて、エンドマーカの送信指示がP-GW60からSource eNBに送信される。以下、上述した第1実施形態と異なる部分について主に説明する。
図8は、P-GW60の機能ブロック構成図である。また、図9は、S-GW50の機能ブロック構成図である。なお、本実施形態に係る移動通信システム10の構成は、第1実施形態と同様(図2参照)である。また、図8及び図9でも、本発明に関連する機能ブロックのみ図示し、他の機能ブロックについては図示していないことに留意されたい。
図8に示すように、P-GW60は、パス設定部61及び送信指示部65を備える。パス設定部61は、第1実施形態と同様である。
図9に示すように、S-GW50は、送信指示受信部55及びエンドマーカ送信部57を備える。
次に、本実施形態に係る移動通信システム10の動作について説明する。具体的には、第1実施形態と同様に、Source S-GWからTarget S-GWにS-GW50が切り替わる場合におけるUE20のハンドオーバ手順について説明する。
図10は、動作例1に係るUE20のハンドオーバ手順を示す。具体的には、図10は、3GPP TS23.401のFigure 5.5.1.1.3-1(X2-based handover with Serving GW relocation)に示されているハンドオーバ手順に変更を加えたものである。動作例1では、S5/S8インターフェースとしてGTPが用いられる。
図11は、動作例2に係るUE20のハンドオーバ手順を示す。具体的には、図11は、3GPP TS23.402(V9.12.0)のFigure 5.7.1-1(Intra-LTE and Inter-eNodeB Handover with Serving GW Relocation)に示されているハンドオーバ手順に変更を加えたものである。動作例2では、S5/S8インターフェースとしてPMIPが用いられる。
本実施形態に係る移動通信システム10によれば、S-GW Relocationの場合でも、下りデータ転送パスの切り替えを認識できるP-GW60からSource S-GWにエンドマーカの送信指示を送信でき、Source S-GWはSource eNBにエンドマーカを送信できる。このため、第1実施形態と同様に、S-GW Relocationの場合でも、下りデータのスループットの低下を回避しつつ、下りデータの順序性を保証し得る。
上述したように、本発明の一実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態が明らかとなろう。
20…UE
30…eNB
40…MME
50…S-GW
51…エンドマーカ受信部
53…エンドマーカ転送部
55…送信指示受信部
57…エンドマーカ送信部
60…P-GW
61…パス設定部
63…エンドマーカ送信部
65…送信指示部
70…PCRF
Claims (8)
- 移動局宛ての下りデータをソースサービングゲートウェイ装置またはターゲットサービングゲートウェイ装置に向けて転送するPDNゲートウェイ装置であって、
前記移動局のソース無線基地局からターゲット無線基地局への遷移に伴って、前記ターゲットサービングゲートウェイ装置及び前記ターゲット無線基地局を経由する下りデータ転送パスを、前記ターゲットサービングゲートウェイ装置と設定するパス設定部と、
前記遷移に伴って、前記ソース無線基地局を管理する前記ソースサービングゲートウェイ装置から前記ターゲット無線基地局を管理する前記ターゲットサービングゲートウェイ装置にサービングゲートウェイ装置が切り替わる場合、前記ソース無線基地局を経由した前記下りデータの転送終了を意味するエンドマーカを、前記パス設定部による前記下りデータ転送パスの設定に応じて、前記ソースサービングゲートウェイ装置に送信するエンドマーカ送信部と
を備えるPDNゲートウェイ装置。 - 前記エンドマーカ送信部は、前記ソースサービングゲートウェイ装置と前記PDNゲートウェイ装置との間おけるGPRSトンネリングプロトコルに従って設定されたユーザプレーンを経由して前記エンドマーカを前記ソースサービングゲートウェイ装置に送信する請求項1に記載のPDNゲートウェイ装置。
- 前記エンドマーカ送信部は、前記ソースサービングゲートウェイ装置と前記PDNゲートウェイ装置との間おけるGeneric Routing Encapsulationプロトコルに従って設定されたユーザプレーンを経由して前記エンドマーカを前記ソースサービングゲートウェイ装置に送信する請求項1に記載のPDNゲートウェイ装置。
- 移動局宛ての下りデータをソースサービングゲートウェイ装置またはターゲットサービングゲートウェイ装置に向けて転送するPDNゲートウェイ装置であって、
前記移動局のソース無線基地局からターゲット無線基地局への遷移に伴って、前記ターゲットサービングゲートウェイ装置及び前記ターゲット無線基地局を経由する下りデータ転送パスを、前記ターゲットサービングゲートウェイ装置と設定するパス設定部と、
前記遷移に伴って、前記ソース無線基地局を管理する前記ソースサービングゲートウェイ装置から前記ターゲット無線基地局を管理する前記ターゲットサービングゲートウェイ装置にサービングゲートウェイ装置が切り替わる場合、前記ソース無線基地局を経由した前記下りデータの転送終了を意味するエンドマーカの送信指示を、前記パス設定部による前記下りデータ転送パスの設定に応じて、前記ソースサービングゲートウェイ装置に送信する送信指示部と
を備えるPDNゲートウェイ装置。 - 前記送信指示部は、前記ソースサービングゲートウェイ装置と前記PDNゲートウェイ装置との間おけるGPRSトンネリングプロトコルに従って設定された制御プレーンを経由して前記送信指示を前記ソースサービングゲートウェイ装置に送信する請求項4に記載のPDNゲートウェイ装置。
- 前記送信指示部は、前記ソースサービングゲートウェイ装置と前記PDNゲートウェイ装置との間おけるProxy Mobile IPv6に従った信号として前記送信指示を前記ソースサービングゲートウェイ装置に送信する請求項4に記載のPDNゲートウェイ装置。
- 移動局宛ての下りデータをソースサービングゲートウェイ装置またはターゲットサービングゲートウェイ装置に向けて転送する移動通信方法であって、
前記移動局のソース無線基地局からターゲット無線基地局への遷移に伴って、前記ターゲットサービングゲートウェイ装置及び前記ターゲット無線基地局を経由する下りデータ転送パスを、前記ターゲットサービングゲートウェイ装置とPDNゲートウェイ装置との間において設定するステップと、
前記遷移に伴って、前記ソース無線基地局を管理する前記ソースサービングゲートウェイ装置から前記ターゲット無線基地局を管理する前記ターゲットサービングゲートウェイ装置にサービングゲートウェイ装置が切り替わる場合、前記PDNゲートウェイ装置が、前記ソース無線基地局を経由した前記下りデータの転送終了を意味するエンドマーカを、前記下りデータ転送パスの設定に応じて、前記ソースサービングゲートウェイ装置に送信するステップと、
前記ソースサービングゲートウェイ装置が、前記PDNゲートウェイ装置から受信した前記エンドマーカを前記ソース無線基地局に転送するステップと
を含む移動通信方法。 - 移動局宛ての下りデータをソースサービングゲートウェイ装置またはターゲットサービングゲートウェイ装置に向けて転送する移動通信方法であって、
前記移動局のソース無線基地局からターゲット無線基地局への遷移に伴って、前記ターゲットサービングゲートウェイ装置及び前記ターゲット無線基地局を経由する下りデータ転送パスを、前記ターゲットサービングゲートウェイ装置とPDNゲートウェイ装置との間において設定するステップと、
前記遷移に伴って、前記ソース無線基地局を管理する前記ソースサービングゲートウェイ装置から前記ターゲット無線基地局を管理する前記ターゲットサービングゲートウェイ装置にサービングゲートウェイ装置が切り替わる場合、前記PDNゲートウェイ装置が、前記ソース無線基地局を経由した前記下りデータの転送終了を意味するエンドマーカの送信指示を、前記下りデータ転送パスの設定に応じて、前記ソースサービングゲートウェイ装置に送信するステップと、
前記ソースサービングゲートウェイ装置が、前記PDNゲートウェイ装置から受信した前記送信指示に基づいて、前記エンドマーカを前記ソース無線基地局に転送するステップと
を含む移動通信方法。
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