WO2011021292A1 - Procédé de communication, système de communication, terminal mobile et station de base - Google Patents

Procédé de communication, système de communication, terminal mobile et station de base Download PDF

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Publication number
WO2011021292A1
WO2011021292A1 PCT/JP2009/064575 JP2009064575W WO2011021292A1 WO 2011021292 A1 WO2011021292 A1 WO 2011021292A1 JP 2009064575 W JP2009064575 W JP 2009064575W WO 2011021292 A1 WO2011021292 A1 WO 2011021292A1
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Prior art keywords
communication
base station
handover
unit
area
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PCT/JP2009/064575
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English (en)
Japanese (ja)
Inventor
秀明 吉田
友晃 兼田
昭雄 大橋
隆史 川嶋
純一 江原
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富士通株式会社
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Priority to PCT/JP2009/064575 priority Critical patent/WO2011021292A1/fr
Publication of WO2011021292A1 publication Critical patent/WO2011021292A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology

Definitions

  • the present invention relates to a communication method, a communication system, a mobile terminal, and a base station that perform wireless communication.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • FIG. 5 is a diagram illustrating an example of a conventional communication system.
  • the MS 150 Mobile Station
  • the MS 150 moves from the LTE area to the 3GPP area (cell movement) and performs handover from the eNB 120 (evolutionary Node-B) in the LTE area to the NB 142 (Node-B) in the 3GPP area.
  • the MS 150 Mobile Station
  • the eNB 120 evolutionary Node-B
  • NB 142 Node-B
  • route switching is performed to establish the route between the GW 112 (Gateway), the GSN 132 (GPRS Support Node), the RNC 141 (Radio Network Controller), the NB 142, the MS 150, and the route between the eNB 120 and the RNC 141.
  • the new user data is transmitted by the 3GPP system via the GW 112 and the GSN 132.
  • the eNB 120 receives data that has not reached the MS 150 (hereinafter referred to as “unreachable data”) at the time when the cell movement of the MS 150 and data that has been transferred from the GW 112 to the eNB 120 in the transition period of the route switching (hereinafter referred to as “transient”). Period transfer data ”) to the RNC 141. Next, the route between the eNB 120 and the RNC 141 is released.
  • the RNC 141 transfers the unreachable data from the eNB 120, the transitional transfer data from the eNB 120, and the transfer data from the GSN 132 after the route switching (hereinafter referred to as “data after route switching”) to the MS 150 in this order.
  • the MS 150 performs handover from the eNB 120 to the NB 142.
  • the new user data is transmitted by the 3GPP route of the GW 112, the GSN 132, the RNC 141, the NB 142, and the MS 150.
  • FIG. 6 is a diagram showing an example of a protocol stack in the communication system shown in FIG.
  • a protocol stack 200 illustrated in FIG. 6 is a protocol stack when processing performed in the communication system 100 is viewed from the MS 150.
  • processing of the MAC (Medium Access Control) layer, the RLC (Radio Link Control) layer, and the PDCP (Packet Data Convergence Protocol) layer is performed in each of the LTE route and the 3GPP route.
  • the application layer is common to the LTE route and the 3GPP route.
  • the PDCP layer performs LTE data encryption setting and decryption.
  • the RLC layer performs encryption setting and decryption of 3GPP data.
  • the application of the PDCP layer processing is arbitrary, and the PDCP layer processing may not be performed.
  • FIG. 7 is a block diagram showing an example of processing of each device shown in FIG. In FIG. 7, the same parts as those shown in FIG. Here, processing related to the downlink and uplink of the 3GPP route after the MS 150 performs handover from the eNB 120 to the NB 142 will be described.
  • the GW 112 transfers data transmitted from the Internet 111 to the GSN 132 (xGSN).
  • the GSN 132 transfers the data transferred from the GW 112 to the RNC 141.
  • the RNC 141 receives the data transferred from the GSN 132, performs 3GPP PDCP processing, RLC processing, and MAC processing on the received data, and transmits the data to the MS 150.
  • the MS 150 receives the data transmitted from the RNC 141 and performs 3GPP MAC processing, RLC processing, and PDCP processing on the received data.
  • the MS 150 performs 3GPP PDCP processing, RLC processing, and MAC processing on the user data and transmits the user data to the RNC 141.
  • the RNC 141 receives the data transferred from the MS 150, performs 3GPP MAC processing, RLC processing, and PDCP processing on the received data, and transmits the data to the GSN 132.
  • the GSN 132 transfers data from the RNC 141 to the GW 112.
  • the GW 112 transfers data from the GSN 132 to the Internet 111.
  • FIG. 8 is a sequence diagram showing an example of a handover operation of the communication system shown in FIG. In FIG. 8, steps similar to those shown in FIG. In step S407, the RNC 141 and the NB 142, the NB 142 and the MS 150 perform mutual connection settings, and the GSN 132 and the RNC 141 perform mutual connection settings.
  • step S412 unreached data is transferred from eNB 120 to MS 150 via RNC 141 (step S412-1).
  • the transition period transfer data from the Internet 111 is transferred to the RNC 141 via the eNB 120 (step S412-2).
  • the route-switched data from the Internet 111 is transferred to the RNC 141 via the GW 112 and GSN 132 (step S412-3).
  • step S415 eNB 120 and GW 112 release each other's connection (step S801), eNB 120 and RNC 141 release each other's connection (step S802), and eNB 120 and MS 150 release each other's connection (step S803). ). Further, after step S416, the MME 131, GSN 132, RNC 141, NB 142, and MS 150 negotiate encryption parameters (step S804).
  • the above-described conventional technique has a problem that the handover process is complicated because it is a handover between base stations having different communication methods.
  • the disclosed communication method, communication system, mobile terminal and base station are intended to solve the above-described problems and to simplify the handover process.
  • the disclosed technology provides a mobile terminal from a first communication area to a second communication area having a communication method different from that of the first communication area in a wireless communication system.
  • a communication path between the first base station in the first communication area and the second base station in the second communication area is established and established.
  • the mobile terminal is handed over from the first base station to the second base station through a communication path, and after the handover, the mobile terminal communicates through the communication path.
  • the handover process can be simplified.
  • FIG. 2 is a sequence diagram illustrating an example of a handover operation of the communication system illustrated in FIG. 1.
  • FIG. 1 It is a figure which shows an example of the conventional communication system.
  • FIG. 6 is a sequence diagram illustrating an example of a handover operation of the communication system illustrated in FIG. 5.
  • FIG. 1 is a diagram illustrating an example of a communication system according to an embodiment.
  • the communication system 100 includes an Internet 111 (network), a GW 112, an eNB 120 (first base station), an MME 131, a GSN 132, an RNC 141, and an NB 142 (second base). Station) and MS 150 (mobile terminal).
  • the communication system 100 is a communication system that performs wireless communication.
  • a solid line double arrow indicates a communication path in the U-Plane (user plane).
  • U-Plane is a logical channel for data transmission such as PSDU (PLCP Service Data Unit).
  • Dashed double arrows indicate communication paths in the C-Plane (control plane).
  • C-Plane is a logical channel for exchanging control messages.
  • the communication path between the eNB 120 and the NB 142 is established by the cell movement (reference numeral 151) of the MS 150 from the LTE area (first communication area) to the 3GPP area (second communication area).
  • the communication path between the eNB 120 and the NB 142 includes a communication path L1 (first communication path) between the eNB 120 and the RNC 141 and a communication path L2 (second communication path) between the RNC 141 and the NB 142.
  • eNB120 transfers the data which have not reached MS150 among the data received from GW112 to RNC141 in PDCP PDU (PDCP Protocol Data Unit) format. Further, the eNB 120 also transfers data received from the GW 112 to the RNC 141 in the PDCP PDU format. Thereafter, data from the Internet 111 is transferred through a route including the communication routes L1 and L2 of the GW 112, eNB 120, RNC 141, NB 142, and MS 150.
  • PDCP PDU PDCP Protocol Data Unit
  • the MS 150 performs handover from the eNB 120 to the NB 142 in a state where the route data including the communication routes L1 and L2 is transferred. That is, the MS 150 stops receiving data from the eNB 120 and starts receiving data from the NB 142. In this way, during and after the handover process, the MS 150 communicates with the Internet 111 through the communication paths L1 and L2.
  • FIG. 2 is a diagram showing an example of a protocol stack in the communication system shown in FIG.
  • a protocol stack 200 shown in FIG. 2 is a protocol stack showing processing viewed from the MS 150.
  • the MAC layer and the RLC layer are processed in each of the LTE route and the 3GPP route.
  • the LTE route MAC processing and RLC processing are performed between the eNB 120 and the MS 150
  • the 3GPP route MAC processing and RLC processing are performed between the RNC 141 and the MS 150.
  • the PDCP layer and the application layer are common to the LTE route and the 3GPP route. For example, PDCP processing and application processing are performed between the eNB 120 and the MS 150. Then, data encryption setting and cancellation are performed by the PDCP layer of the LTE route and the 3GPP route.
  • the encryption process between the eNB 120 and the MS 150 performed in the LTE route before the handover can be continued in the 3GPP route after the handover. For this reason, since it is not necessary to perform the negotiation of encryption again, the handover process from LTE to 3GPP can be simplified.
  • the MS 150 is located in the vicinity of the eNB 120 (LTE area) and communicates with the Internet 111 via the LTE route via the eNB 120 and the GW 112.
  • the processing of each layer of LTE is processed by the eNB 120.
  • the eNB 120 and the MS 150 transmit and receive PDCP PDUs by performing processing of each layer in LTE (for example, PDCP processing, RLC processing, MAC processing).
  • the MS 150 moves away from the eNB 120 and moves to the vicinity of the NB 142 (3GPP area) as indicated by reference numeral 151 in FIG. 1 (cell movement).
  • the MS 150 performs handover from the LTE route to the 3GPP route.
  • the MS 150 communicates with the Internet 111 through a 3GPP route via the NB 142, the RNC 141, the eNB 120, and the GW 112.
  • the downlink from the Internet 111 to the MS 150 will be described.
  • the eNB 120 detects cell movement from the LTE area of the MS 150 to the 3GPP area during communication using the LTE route, the eNB 120 generates a PDCP PDU by performing PDCP processing on the transfer data from the GW 112. Then, the eNB 120 transmits the generated PDCP PDU to the RNC 141.
  • the RNC 141 acquires the PDCP PDU transferred from the eNB 120 as the RLC_SDU, and generates the RLC_PDU by performing the RLC process on the acquired RLC_SDU.
  • the RNC 141 since the data encryption has already been performed by the PDCP process of the eNB 120, it may not be performed in the RLC process of the RNC 141.
  • the RNC 141 generates a MAC_PDU by performing MAC processing using the generated RLC_PDU as a MAC_SDU.
  • the RNC 141 transmits the generated MAC_PDU to the NB 142.
  • NB 142 transfers the MAC_PDU transmitted from RNC 141 to MS 150.
  • the MS 150 receives the MAC_PDU transferred from the NB 142 by performing processing of each layer in 3GPP (see FIG. 2).
  • the MS 150 generates a MAC_PDU by performing processing of each layer in 3GPP (see FIG. 2) on user data.
  • MS 150 detects movement from the LTE area to the 3GPP area, it transmits the generated MAC_PDU to NB 142.
  • the NB 142 transfers the MAC_PDU transmitted from the MS 150 to the RNC 141.
  • the RNC 141 generates a MAC_SDU by performing a MAC process on the MAC_PDU transferred from the NB 142.
  • the RNC 141 generates RLC_SDU by performing RLC processing using the generated MAC_SDU as RLC_PDU.
  • the RNC 141 transmits the generated RLC_SDU to the eNB 120 as a PDCP PDU.
  • the eNB 120 performs PDCP processing on the PDCP PDU transmitted from the RNC 141, and transmits the PDCP processed data to the GW 112.
  • the GW 112 transfers the data transmitted from the eNB 120 to the Internet 111.
  • FIG. 3 is a block diagram illustrating an example of processing of each device illustrated in FIG. 1.
  • the solid line arrow indicates the LTE route.
  • a dotted arrow indicates a 3GPP route.
  • the GW 112 transfers the data transmitted from the Internet 111 to the eNB 120.
  • the eNB 120 includes a reception unit 311, a PDCP unit 312, an RLC unit 313, a MAC unit 314, a transmission unit 315, a reception unit 316, and a transmission unit 317.
  • the reception unit 311 receives the data transmitted from the GW 112 and outputs the received data to the PDCP unit 312.
  • the PDCP unit 312 performs LTE PDCP processing on the data output from the receiving unit 311, and outputs the data subjected to PDCP processing to the RLC unit 313.
  • the PDCP unit 312 includes a header operation unit 312a, a concealment setting unit 312b, and a concealment release unit 312c.
  • the header operation unit 312a performs a header operation (including data compression processing, for example) on the data output from the reception unit 311 and outputs the data subjected to the header operation to the confidentiality setting unit 312b.
  • the secrecy setting unit 312b encrypts the data output from the header operation unit 312a, and outputs the encrypted data to the RLC unit 313.
  • the RLC unit 313 performs LTE RLC processing on the data output from the PDCP unit 312, and outputs the RLC-processed data to the MAC unit 314.
  • the MAC unit 314 performs LTE MAC processing on the data output from the RLC unit 313, and outputs the data subjected to the MAC processing to the transmission unit 315.
  • the transmission unit 315 transmits the data output from the MAC unit 314 to the MS 150.
  • the MS 150 includes a reception unit 321, a MAC unit 322, an RLC unit 323, a PDCP unit 324, an application unit 325, a MAC unit 326, an RLC unit 327, a transmission unit 328, and a PDCP unit 329. ing.
  • the reception unit 321 receives data transmitted from the eNB 120 and outputs the received data to the MAC unit 322.
  • the MAC unit 322 performs LTE MAC processing on the data output from the receiving unit 321, and outputs the MAC-processed data to the RLC unit 323.
  • the RLC unit 323 performs LTE RLC processing on the data output from the MAC unit 322, and outputs the RLC-processed data to the PDCP unit 324.
  • the PDCP unit 324 performs LTE PDCP processing on the data output from the RLC unit 323, and outputs the PDCP processed data to the application unit 325.
  • the PDCP unit 324 includes a concealment release unit 324a, a header operation unit 324b, and a concealment setting unit 324c.
  • the secret release unit 324a decodes the data output from the RLC unit 323 and outputs the decoded data to the header operation unit 324b.
  • the header operation unit 324b performs a header operation (including data decompression processing, for example) on the data output from the concealment cancellation unit 324a, and outputs the data subjected to the header operation to the application unit 325.
  • the application unit 325 performs application layer processing of data output from the header operation unit 324b.
  • the application unit 325 of the MS 150 outputs the data generated by the application layer processing to the PDCP unit 324.
  • the PDCP unit 324 performs LTE PDCP processing on the data output from the application unit 325 and outputs the PDCP processed data to the RLC unit 323.
  • the header operation unit 324b performs a header operation (including data compression processing, for example) on the data output from the application unit 325, and outputs the data subjected to the header operation to the confidentiality setting unit 324c.
  • the confidentiality setting unit 324 c encrypts the data output from the RLC unit 323 and outputs the encrypted data to the RLC unit 323.
  • the RLC unit 323 performs LTE RLC processing on the data output from the concealment setting unit 324c, and outputs the RLC-processed data to the MAC unit 322.
  • the MAC unit 322 performs LTE MAC processing on the data output from the RLC unit 323, and outputs the data subjected to the MAC processing to the transmission unit 328.
  • the transmission unit 328 transmits the data output from the MAC unit 322 to the eNB 120.
  • the receiving unit 316 of the eNB 120 receives the data transmitted from the MS 150 and outputs the received data to the MAC unit 314.
  • the MAC unit 314 performs LTE RLC processing on the data output from the receiving unit 316, and outputs the RLC-processed data to the RLC unit 313.
  • the RLC unit 313 performs LTE RLC processing on the data output from the MAC unit 314, and outputs the RLC-processed data to the PDCP unit 312.
  • the PDCP unit 312 performs LTE PDCP processing on the data output from the RLC unit 313, and outputs the data subjected to PDCP processing to the transmission unit 317. Specifically, the concealment release unit 312c decodes the data output from the RLC unit 313, and outputs the decoded data to the header operation unit 312a.
  • the header operation unit 312a performs a header operation (including data decompression processing, for example) on the data output from the deciphering unit 312c, and outputs the data subjected to the header operation to the transmission unit 317.
  • the transmission unit 317 transmits the data output from the transmission unit 315 to the GW 112.
  • the GW 112 transfers the data transmitted from the eNB 120 to the Internet 111.
  • the GW 112 transfers the data transmitted from the Internet 111 to the eNB 120.
  • the description of the same part as the process related to the downlink of the LTE route described above is omitted.
  • the PDCP unit 312 outputs the data subjected to PDCP processing to the transmission unit 315.
  • Transmitting section 315 transmits the data output from PDCP section 312 to RNC 141.
  • the RNC 141 includes a reception unit 331, an RLC unit 332, a MAC unit 333, a transmission unit 334, a reception unit 335, and a transmission unit 336.
  • the receiving unit 331 receives the data transmitted from the eNB 120 and outputs the received data to the RLC unit 332.
  • the RLC unit 332 performs 3GPP RLC processing on the data output from the receiving unit 331, and outputs the RLC-processed data to the MAC unit 333.
  • the RLC unit 332 includes a signal processing unit 332a, a concealment setting unit 332b, and a concealment release unit 332c.
  • the signal processing unit 332a performs signal processing on the data output from the receiving unit 331, and outputs the data subjected to the signal processing to the MAC unit 333.
  • the MAC unit 333 performs 3GPP MAC processing on the data output from the RLC unit 332, and outputs the MAC-processed data to the transmission unit 334.
  • the transmission unit 334 transmits the data output from the MAC unit 333 to the MS 150 via the NB 142.
  • the receiving unit 321 of the MS 150 receives data transmitted from the RNC 141 via the NB 142 and outputs the received data to the MAC unit 326.
  • the MAC unit 326 performs 3GPP MAC processing on the data output from the receiving unit 321, and outputs the MAC-processed data to the RLC unit 327.
  • the RLC unit 327 performs 3GPP RLC processing on the data output from the MAC unit 326, and outputs the RLC-processed data to the PDCP unit 324.
  • the RLC unit 327 includes a signal processing unit 327a, a concealment release unit 327b, and a concealment setting unit 327c.
  • the signal processing unit 327 a performs signal processing on the data output from the MAC unit 326 and outputs the signal processed data to the PDCP unit 324.
  • the privacy release unit 324a of the PDCP unit 324 decodes the data from the RLC unit 327.
  • the PDCP unit 324 outputs the PDCP processed data to the RLC unit 327.
  • the RLC unit 327 performs 3GPP RLC processing on the data output from the PDCP unit 324 and outputs the RLC-processed data to the MAC unit 326.
  • the signal processing unit 327 a of the RLC unit 327 performs signal processing on the data output from the PDCP unit 324 and outputs the signal processed data to the MAC unit 326.
  • the MAC unit 326 performs 3GPP MAC processing on the data output from the RLC unit 327 and outputs the data subjected to the MAC processing to the transmission unit 328.
  • the transmission unit 328 transmits the data output from the MAC unit 326 to the RNC 141 via the NB 142.
  • the reception unit 335 of the RNC 141 receives data transmitted from the MS 150 via the NB 142 and outputs the received data to the MAC unit 333.
  • the MAC unit 333 performs 3GPP MAC processing on the data output from the receiving unit 335, and outputs the data subjected to the MAC processing to the RLC unit 332.
  • the RLC unit 332 performs 3GPP RLC processing on the data output from the MAC unit 333, and outputs the RLC-processed data to the transmission unit 336.
  • the signal processing unit 332 a of the RLC unit 332 performs signal processing on the data output from the MAC unit 333, and outputs the data subjected to the signal processing to the transmission unit 336.
  • the transmission unit 336 transmits the data output from the RLC unit 332 to the eNB 120.
  • the receiving unit 316 receives the data transmitted from the RNC 141 and outputs the received data to the PDCP unit 312.
  • the secrecy cancellation unit 312c of the PDCP unit 312 decodes the data output from the reception unit 316.
  • the PDCP processing by the PDCP unit 337 (header operation unit 337a) of the RNC 141 may not be performed.
  • the RLC process and the MAC process are performed by the RNC 141, and thus the process in the RLC unit 313 and the MAC unit 314 of the eNB 120 may not be performed.
  • the decryption by the PDCP process of LTE is performed by the concealment canceling unit 324a of the PDCP unit 324, so that the decryption by the concealment canceling unit 327b of the RLC unit 327 may not be performed.
  • encryption by the PDCP process of LTE is performed by the secret setting unit 324c of the PDCP unit 324, the encryption by the secret setting unit 327c of the RLC unit 327 may not be performed.
  • the PDCP unit 324 performs LTE PDCP processing
  • the PDCP processing in the PDCP unit 329 may not be performed.
  • data is transferred through the communication paths L1 and L2 (see FIG. 1) even in the 3GPP route, the data can be transferred without going through the GSN 132.
  • data is transferred between the eNB 120 and the MS 150 by PDCP processing.
  • data encryption is performed between the eNB 120 and the MS 150 by LTE PDCP processing. This makes it possible to omit PDCP processing and encryption negotiation in handover. Further, by performing data encryption by LTE PDCP processing even after handover, it is possible to suppress a decrease in data propagation efficiency due to handover to 3GPP.
  • the MS 150 includes a detection unit that detects cell movement, a handover unit that performs handover from the eNB 120 to the NB 142, and a communication unit that performs communication via the communication paths L1 and L2.
  • the detection unit of the MS 150 measures the reception quality of each reference signal from the eNB 120 and the NB 142, and detects cell movement by comparing the measured reception qualities.
  • the detection unit, the handover unit, and the communication unit of the MS 150 are, for example, the reception unit 321, the transmission unit 328, the RLC unit 323, and the RLC unit 327.
  • the eNB 120 includes a connection unit that establishes communication paths L1 and L2 with the NB 142, a handover unit that performs handover processing of the MS 150, and a relay unit that relays communication of the MS 150.
  • the connection unit, the handover unit, and the relay unit of the eNB 120 are, for example, the reception unit 311, the transmission unit 315, the reception unit 316, the transmission unit 317, and the RLC unit 313.
  • Receiving units 311, 316, 321, 331, 335 and transmitting units 315, 317, 328, 334, 336 are each realized by a wireless communication interface such as an antenna.
  • Each of the PDCP units 312, 324, 329, 337, the RLC units 313, 323, 327, 332 and the MAC units 314, 322, 326, 333 is realized by an arithmetic circuit such as a DSP (Digital Signal Processor). .
  • DSP Digital Signal Processor
  • FIG. 4 is a sequence diagram showing an example of a handover operation of the communication system shown in FIG.
  • a communication path is established in each section of the MS 150 and the eNB 120, the eNB 120 and the GW 112, and the GW 112 and the Internet 111, and the MS 150 and the Internet 111 are communicating via the LTE route (step S401).
  • the cell movement of the MS 150 from the LTE area to the 3GPP area has occurred (step S402).
  • the MS 150 transmits a cell movement report for reporting the cell movement in step S402 to the eNB 120 (step S403).
  • eNB120 can detect the cell movement of MS150.
  • the eNB 120 transmits a handover start request to the MME 131 (step S404).
  • the MME 131 transmits a data transfer preparation request for requesting preparation for data transfer from the LTE system to the 3GPP system to the GSN 132 (step S405).
  • the GSN 132 transmits a location change request for requesting a location change to the RNC 141 (step S406).
  • the RNC 141 and the NB 142 perform mutual connection settings, and the NB 142 and the MS 150 perform mutual connection settings (step S407).
  • the eNB 120 and the RNC 141 perform mutual connection settings (step S408).
  • the RNC 141 transmits a location change response to the location change request transmitted in step S406 to the GSN 132 (step S409).
  • the GSN 132 transmits a data transfer preparation response to the data transfer preparation request transmitted in step S405 to the MME 131 (step S410).
  • the MME 131 transmits to the eNB 120 a data transfer command for requesting data transfer from the LTE system to the 3GPP system (step S411).
  • the eNB 120 starts transferring the data transmitted from the Internet 111 to the RNC 141 (step S412).
  • step S412 the data transmitted from the Internet 111 is transferred from the eNB 120 to the RNC 141, and the data transferred to the RNC 141 is transferred to the MS 150 via the NB 142.
  • the eNB 120 transmits a handover command to the MS 150 (step S413).
  • the MS 150 performs handover from the eNB 120 to the NB 142, and transmits a handover completion report to the RNC 141 (step S414).
  • the data from the eNB 120 is transferred to the MS 150 through the communication paths L1 and L2, and the handover is performed in a state where the data is transferred from the eNB 120 to the MS 150.
  • the RNC 141 transmits a location change completion report for the location change request transmitted in step S406 to the GSN 132 (step S415).
  • the MME 131, the GSN 132, the RNC 141, the NB 142, and the MS 150 update the location information (step S416), and the series of handover operations ends.
  • the MS 150 and the Internet 111 can communicate by the 3GPP route via the GW 112, the eNB 120, the RNC 141, and the NB 142.
  • the connection setting between the GSN 132 and the RNC 141 in step S407 in FIG. 8 can be omitted.
  • the connection release in steps S801 to S803 in FIG. 8 can be omitted. This eliminates the need for negotiation between higher layers accompanying the setting and release of these connections.
  • data from the eNB 120 is transferred to the MS 150 via the communication paths L1 and L2, and handover is performed in a state where the data is transferred from the eNB 120 to the MS 150.
  • the GW 112 may transfer the data to the eNB 120 in the same manner as before the handover process.
  • the RNC 141 may receive data from the eNB 120 in the same manner as before the handover process. For this reason, the data transfer process during the handover process can be simplified.
  • the eNB 120 may switch the data transfer destination from the Internet 111 from the MS 150 to the RNC 141. Therefore, unlike the communication system 100 shown in FIG. 5, the transitional period transfer data is not generated, so that the transitional period transfer data transfer shown in step S412-2 of FIG. As a result, the timing adjustment between step S412-1 and step S412-2 and the timing adjustment between step S412-2 and step S412-3 in FIG. 8 become unnecessary. For this reason, the handover process can be further simplified.
  • the buffer capacity of the RNC 141 for transferring the transitional period transfer data shown in step S412-2 becomes unnecessary. For this reason, the memory usage efficiency of the RNC 141 can be improved.
  • the maximum size of user data per buffer for example, 1.5 Mbytes
  • the use of memory becomes unnecessary because the transfer of transitional transfer data becomes unnecessary. Efficiency can be greatly improved.
  • data is encrypted between the eNB 120 and the MS 150 during the handover process (transfer process) and after the handover (communication process).
  • the encryption process between eNB120 and MS150 performed before the handover can be continued after the handover.
  • it is not necessary to negotiate encryption again for example, step S804 in FIG. 8 when performing handover, the handover process from LTE to 3GPP can be further simplified.
  • data is transferred between the eNB 120 and the MS 150 by the PDCP process during the handover process (transfer process) and after the handover (communication process). Accordingly, the LTE PDCP process between the eNB 120 and the MS 150 performed before the handover can be continued after the handover.
  • the handover process from LTE to 3GPP can be further simplified.
  • the PDCP process of LTE can be continued after the handover to 3GPP, it is possible to suppress a decrease in data propagation efficiency due to the handover to 3GPP.
  • the handover process can be simplified.
  • the Internet 111 is exemplified as the network. However, a wide area network different from the Internet 111 may be applied.
  • eNB120 was illustrated as a 1st base station, the base station which has the function similar to eNB120 is also applicable.
  • NB142 was illustrated as a 2nd base station, the base station (For example, BTS: Base Transceiver Station) which has the function similar to NB142 is also applicable.
  • MS150 was illustrated as a mobile terminal, the mobile terminal (for example, UE: User Equipment) which has the function similar to MS150 is also applicable.
  • the communication system 100 has been described as a communication system including LTE and 3GPP communication systems, various communication systems (for example, LTE-Advanced) compliant with LTE can be applied to LTE.
  • various communication methods based on 3GPP can be applied to 3GPP.
  • RNC 141 is S-RNC (Serving-RNC)
  • RNC corresponding to the new 3GPP base station is D-RNC (Drift-RNC)
  • S-RNC to D -Data transfer may be performed to the RNC.
  • L1 communication path 100 communication system 111 internet 112 GW 120 eNB 131 MME 132 GSN 141 RNC 142 NB 150 MS 200 protocol stack

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

Abstract

Dans un système de communication (100), lorsqu'un mouvement de cellule d'une station mobile (MS) (150) à partir d'une zone LTE vers une zone 3GPP est détecté, des trajets de communication (L1, L2) sont établis entre un nœud B évolué (eNB) (120) de la zone LTE et un nœud B (NB) (142) de la zone 3GPP. Ensuite, les trajets de communication établis (L1, L2) sont utilisés pour réaliser un transfert intercellulaire de la MS (150) de l’eNB (120) au NB (142). Après le transfert intercellulaire, la MS (150) réalise une communication par utilisation des trajets de communication (L1, L2).
PCT/JP2009/064575 2009-08-20 2009-08-20 Procédé de communication, système de communication, terminal mobile et station de base WO2011021292A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002501695A (ja) * 1997-04-15 2002-01-15 ノキア ネットワークス オサケ ユキチュア パケットベースのテレコミュニケーションネットワークにおけるハンドオーバー時のパケットロス回避方法及びハンドオーバー方法
WO2006106846A1 (fr) * 2005-03-30 2006-10-12 Matsushita Electric Industrial Co., Ltd. Procede de transfert intercellulaire et procede de traitement de message de communication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002501695A (ja) * 1997-04-15 2002-01-15 ノキア ネットワークス オサケ ユキチュア パケットベースのテレコミュニケーションネットワークにおけるハンドオーバー時のパケットロス回避方法及びハンドオーバー方法
WO2006106846A1 (fr) * 2005-03-30 2006-10-12 Matsushita Electric Industrial Co., Ltd. Procede de transfert intercellulaire et procede de traitement de message de communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
3GPP TS 23.401 V1.2.1, September 2007 (2007-09-01), pages 62 - 65 *

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