US20040005893A1 - Handover control, apparatus, base station, edge router, relay router, radio terminal apparatus, mobile communication system, and handover control method - Google Patents

Handover control, apparatus, base station, edge router, relay router, radio terminal apparatus, mobile communication system, and handover control method Download PDF

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Publication number
US20040005893A1
US20040005893A1 US10/399,785 US39978503A US2004005893A1 US 20040005893 A1 US20040005893 A1 US 20040005893A1 US 39978503 A US39978503 A US 39978503A US 2004005893 A1 US2004005893 A1 US 2004005893A1
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United States
Prior art keywords
radio terminal
terminal unit
data
router
handover
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Abandoned
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US10/399,785
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English (en)
Inventor
Shinichi Isobe
Ken Igarashi
Atsushi Iwasaki
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IGARASHI, KEN, ISOBE, SHINICHI, IWASAKI, ATSUSHI
Publication of US20040005893A1 publication Critical patent/US20040005893A1/en
Priority to US11/692,126 priority Critical patent/US7424295B2/en
Abandoned 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
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • 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

Definitions

  • the present invention relates to a handover control apparatus, a base station, an edge router, a relay router, a radio terminal unit, a mobile communication system, and a handover control method.
  • packet data is buffered in an edge router provided in a base station during a handover of a radio terminal unit, in order to implement handover control without loss of packet data.
  • the buffered packet data is forwarded to an edge router at a destination.
  • FIG. 6 A configuration of a mobile communication system performing such handover control is presented in FIG. 6 and will be described below.
  • This mobile communication system shown in FIG. 6 is comprised of a radio terminal unit 10 which is a mobile communication means such as a cellular telephone or the like, a plurality of base stations 12 , 14 , 16 for radio communication with the radio terminal unit 10 , edge routers 18 , 20 , 22 provided in these base stations 12 - 16 , and CORs (Cross Over Routers) 24 , 26 , 28 connected to these edge routers 18 - 22 .
  • a radio terminal unit 10 which is a mobile communication means such as a cellular telephone or the like
  • base stations 12 , 14 , 16 for radio communication with the radio terminal unit 10
  • edge routers 18 , 20 , 22 provided in these base stations 12 - 16
  • CORs Cross Routers
  • CORs 24 - 28 are arranged in a hierarchical structure with COR 28 at the top, in which the edge routers 18 , 20 are under COR 24 , the edge router 22 under COR 26 , and the edge routers 18 - 22 under COR 28 through CORs 24 , 26 .
  • the data buffering point was the previous edge router 20 in the handover control during movement of the radio terminal unit 10 from a covered area of the edge router 20 to a covered area of the edge router 22 .
  • all packet data transmitted from an unrepresented correspondent node as a sender during the handover of the radio terminal unit 10 was once forwarded through CORs 28 , 24 to the previous edge router 20 connected before the movement, as indicated by an arrow Y 1 , and buffered therein.
  • an instruction is then given to instruct the previous edge router 20 to forward the buffered packet data and in accordance with this instruction, as indicated by an arrow Y 2 , the packet data is forwarded from the edge router 20 through a plurality of CORs 24 , 28 , 26 to the radio terminal unit 10 connected to the new edge router 22 after the movement.
  • the lossless handover was achieved by the buffering in the previous edge router 20 in this way.
  • the packet data is forwarded from the edge router 20 connected before the movement, through the CORs 24 , 28 , 26 to the radio terminal unit 10 connected to the edge router 22 after the movement, as indicated by the arrow Y 2 , during the period after the handover of the radio terminal unit 10 and before completion of the forwarding the buffered data.
  • the packet data is forwarded through the redundant path during the handover control and this poses the problem of waste of network resources.
  • the present invention has been accomplished in view of the above problems and an object of the invention is to provide a handover control apparatus, a base station, an edge router, a relay router, a radio terminal unit, a mobile communication system, and a handover control method capable of implementing forwarding packet data through an optimal path to the radio terminal unit after movement in handover control and thereby achieving effective utilization of network resources and prevention of the packet miss-ordering during the handover.
  • a handover control apparatus of the present invention is a handover control apparatus for controlling handover of a radio terminal unit between edge routers provided in respective base stations for radio communication with radio terminal unit, the handover control apparatus comprising: control means for performing such control as to buffer data from a correspondent node in a relay router under which a previous edge router having been connected to the radio terminal unit and every edge router as a candidate for a destination of the movement are connected, during the handover.
  • the data from the correspondent node is buffered in the relay router, whereby it is feasible to nullify the redundant path in forwarding packet data and thereby achieve the effective utilization of network resources and the prevention of packet miss-ordering during the handover.
  • the data since during the handover the data was buffered in the previous edge router having been connected to the radio terminal unit, the data was forwarded from the edge router connected before the movement, through the redundant path via a plurality of routers to the radio terminal unit after the movement, which resulted in waste of network resources.
  • a base station of the present invention is a base station for detecting handover of a radio terminal unit, the base station comprising: retaining means for retaining location information about locations of an adjacent base station and every relay router connected to the adjacent base station; determining means for determining a relay router under which a base station having been connected to the radio terminal unit and every base station as a candidate for a destination of the movement are connected, based on the location information thus retained; and instructing means for instructing the relay router thus determined to buffer data from a correspondent node.
  • the appropriate relay router is instructed to buffer the data from the correspondent node, whereby it is feasible to buffer the data to be transmitted to the radio terminal unit under the handover, and thereby prevent data reception loss.
  • an edge router of the present invention is an edge router provided in a base station for detecting handover of a radio terminal unit and connected by radio communication to the radio terminal unit, the edge router comprising: retaining means for retaining location information about locations of an adjacent edge router and every relay router connected to the adjacent edge router; determining means for determining a relay router under which a previous edge router having been connected to the radio terminal unit and every edge router as a candidate for a destination of the movement are connected, based on the location information thus retained; and instructing means for instructing the relay router thus determined to buffer data from a correspondent node.
  • the data from the correspondent node is buffered in the relay router, whereby it is feasible to nullify the redundant path in forwarding packet data and thereby achieve the effective utilization of network resources and the prevention of packet miss-ordering during the handover.
  • the data since during the handover the data was buffered in the previous edge router having been connected to the radio terminal unit, the data was forwarded from the edge router connected before the movement, through the redundant path via a plurality of routers to the radio terminal unit after the movement, which resulted in waste of network resources.
  • a relay router of the present invention is configured to buffer data from a correspondent node in accordance with an instruction to buffer data, given by the instructing means of the above base station or the above edge router, change a forwarding address of a packet to an address of a destination of the radio terminal unit in accordance with a data forwarding instruction from the radio terminal unit after the handover, put the data with an identifier for identification of the packet, and forward the packet to the current address of the radio terminal unit.
  • the data to be transmitted to the radio terminal unit is buffered during the handover of the radio terminal unit and the buffered data can be properly forwarded after the movement of the radio terminal unit.
  • the identifier is generated in the relay router, and the packet data transmitted from the correspondent node as a sender is kept unchanged without being rewritten, whereby the packet data can be transmitted to the radio communication terminal unit after the movement, without being involved in the problem of security.
  • a radio terminal unit of the present invention is a radio terminal unit configured to implement radio communication with each base station and, during handover between edge routers provided in respective base stations, perform control of the handover, the radio terminal unit comprising: control means for performing such control as to make a relay router under which a previous edge router having been connected to the radio terminal unit and every edge router as a candidate for a destination of the movement are connected, buffer data from a correspondent node during the handover.
  • the data from the correspondent node is buffered in the relay router, whereby it is feasible to nullify the redundant path in forwarding packet data and thereby achieve the effective utilization of network resources and the prevention of packet miss-ordering during the handover.
  • the data since during the handover the data was buffered in the previous edge router having been connected to the radio terminal unit, the data was forwarded from the edge router connected before the movement, through the redundant path via a plurality of routers to the radio terminal unit after the movement, which resulted in waste of network resources.
  • a mobile communication system of the present invention is a mobile communication system for implementing handover of a radio terminal unit between base stations, the mobile communication system comprising: relay routers connected above the base stations in a hierarchical structure and configured to perform relaying of data to the base stations and buffering of data; and edge routers provided in the respective base stations, each edge router being configured to provide an instruction to instruct a relay router under which a base station having been connected to the radio terminal unit and every base station as a candidate for a destination of the movement are connected, to buffer data from a correspondent node during the handover, and instruct the relay router to forward the data buffered in the relay router according to the instruction to the radio terminal unit after the movement.
  • the data from the correspondent node is buffered in the relay router, whereby it is feasible to nullify the redundant path in forwarding packet data and thereby achieve the effective utilization of network resources and the prevention of packet miss-ordering during the handover.
  • the data since during the handover the data was buffered in the previous edge router having been connected to the radio terminal unit, the data was forwarded from the edge router connected before the movement, through the redundant path via a plurality of routers to the radio terminal unit after the movement, which resulted in waste of network resources.
  • a handover control method is a handover control method of controlling handover of a radio terminal unit between edge routers provided in respective base stations for radio communication with radio terminal unit, the handover control method comprising: a control step of performing such control as to buffer data from a correspondent node in a relay router under which a previous edge router having been connected to the radio terminal unit and every edge router as a candidate for a destination of the movement are connected, in accordance with an instruction to buffer the data from the correspondent node.
  • the data from the correspondent node is buffered in the relay router, whereby it is feasible to nullify the redundant path in forwarding packet data and thereby achieve the effective utilization of network resources and the prevention of packet miss-ordering during the handover.
  • the data since during the handover the data was buffered in the previous edge router having been connected to the radio terminal unit, the data was forwarded from the edge router connected before the movement, through the redundant path via a plurality of routers to the radio terminal unit after the movement, which resulted in waste of network resources.
  • FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment.
  • FIG. 2 is a first block diagram for explaining a method of determining a relay router in a mobile communication system according to an embodiment.
  • FIG. 3 is a second block diagram for explaining a method of determining a relay router in a mobile communication system according to an embodiment.
  • FIG. 4 is a block diagram for explaining the operation of forwarding packet data buffered in a relay router in a mobile communication system according to an embodiment.
  • FIG. 5 is a block diagram for explaining the operation of forwarding packet data buffered in a relay router in a mobile communication system according to an embodiment.
  • FIG. 6 is a block diagram showing the configuration of the conventional mobile communication system.
  • FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.
  • This mobile communication system shown in FIG. 1 is comprised of a radio terminal unit 30 which is a mobile communication means such as a cellular phone or the like, a plurality of base stations 32 , 34 , 36 for radio communication with the radio terminal unit 30 , edge routers 38 , 40 , 42 provided in the respective base stations 32 - 36 , and CORs 44 , 46 , 48 connected to these edge routers 38 - 42 .
  • a radio terminal unit 30 which is a mobile communication means such as a cellular phone or the like
  • base stations 32 , 34 , 36 for radio communication with the radio terminal unit 30
  • edge routers 38 , 40 , 42 provided in the respective base stations 32 - 36
  • CORs 44 , 46 , 48 connected to these edge routers 38 - 42 .
  • the CORs 44 - 48 are arranged in a hierarchical structure with COR 48 at the top, in which the edge routers 38 , 40 are under COR 44 , the edge router 42 under COR 46 , and the edge routers 38 - 42 under COR 48 through the CORs 44 , 46 .
  • the edge routers 38 , 40 , 42 retain information about adjacent edge routers to which the radio terminal unit 30 is expected to move next.
  • the edge router 40 retains information about the adjacent edge routers 38 , 42 as the information about the adjacent edge routers to which the radio terminal unit 30 is expected to move next.
  • the mobile communication system is constructed such as Regional Registrations, Hierarchical Mobile IP proposed in IETF.
  • the handover control in movement of the radio terminal unit 30 from a covered area of the edge router 40 to a covered area of the edge router 42 is initiated according to the radio wave condition of wireless links by the radio terminal unit 30 or by the edge router 40 to which the radio terminal unit 30 is connected at present.
  • the radio terminal unit 30 or the edge router 40 determines the COR 48 as a relay router out of a plurality of CORs 44 - 48 on the basis of the information about the adjacent edge routers registered in the edge router 40 .
  • the COR 60 which is connected above to both of the edge router 56 in a currently connected state and the edge router 54 as a candidate destination (or under which the edge router 56 in the currently connected state and the edge router 54 as a candidate destination both are connected), is determined as a relay router.
  • the COR 60 which can transmit packet data from the correspondent node to both the edge router 56 in the currently connected state and the edge router 54 as a candidate destination and which has the minimum hop count from the radio terminal unit 30 , is determined as a relay router.
  • the hop count represents the distance (not physical distance) from the radio terminal unit to the relay router to buffer the data.
  • the radio terminal unit 30 is, for example, in connection with edge router 54 in a configuration where COR 58 is connected to each of edge routers 50 , 52 provided in their respective base stations, COR 60 is further connected to each of edge routers 54 , 56 , COR 62 is connected above to those CORs 58 , 60 , COR 78 is further connected to each of edge routers 70 , 72 , COR 80 is further connected to each of edge routers 74 , 76 , COR 82 is connected above to those CORs 78 , 80 , and COR 84 is connected above to CORs 62 , 82 .
  • edge routers 52 , 56 are recognized as edge routers being candidates for the destination of movement of the radio terminal unit 30 from the adjacent edge router information retained in the edge router 54 .
  • the COR 62 which is connected above to both of the COR 60 connected above to the edge router 54 in a currently connected state and the edge router 56 as a candidate destination and the COR 58 connected above to the edge router 52 as another candidate destination, is determined as a relay router.
  • the COR 62 which can transmit the packet data from the correspondent node to the edge router 54 in the currently connected state and to all the edge routers 56 , 52 as candidate destinations and which has the minimum hop count from the radio terminal unit 30 , is determined as a relay router.
  • the radio terminal unit 30 or the edge router 40 in the currently connected state to the radio terminal unit 30 sends a buffering instruction message to the COR (relay router) 48 shown in FIG. 1 and determined as described above, as indicated by an arrow Y 3 .
  • the COR 48 receiving this message, buffers packet data transmitted thereafter as indicated by an arrow Y 4 from the correspondent node, as a relay router. Thereafter, the radio terminal unit 30 undergoes a handover to one edge router 42 out of the edge routers 38 , 42 of candidate destinations.
  • the radio terminal unit 30 after the handover to the new edge router 42 acquires an address used in the edge router 42 and sends a location registration message for location registration of the new address through the COR (relay router) 48 to the unrepresented home network and the correspondent node as indicated by an arrow Y 5 .
  • the radio terminal unit 30 with the address A for identification of the radio terminal unit in the relay router sends the buffering instruction message to instruct the COR (relay router) 48 to buffer the packet data addressed to the address A before a handover.
  • the COR (relay router) 48 buffers packet data addressed to the address A from the correspondent node as indicated by code 90 .
  • the radio terminal unit 30 when the radio terminal unit 30 is assigned an address B after the handover, it sends to the correspondent node a message for location registration of the address B (location registration message) and a message for instruction of forwarding packet data addressed to the address A (forwarding instruction message). These messages can also be sent in the form of one message.
  • the COR (relay router) 48 receiving those messages, capsulates the packet data to the address A having been buffered there, while assigning the data the destination address B, as indicated by code 91 , and then transmits it to the address B.
  • the radio terminal unit 30 receiving the packet data 91 addressed to B, decapsulates the packet data as indicated by code 92 . Since the destination address of the decapsulated packet data 92 at this time is A, the radio terminal unit 30 cannot receive the packet data 92 under normal circumstances.
  • the radio terminal unit 30 is configured to memorize the address A before the movement in the present invention, so that it can also receive the packet data 92 addressed to the address A, whereby the radio terminal unit can receive the packet data to the address A having been buffered in the COR (relay router) 48 during the handover.
  • the previous edge router 40 having been connected to the radio terminal unit 30 , out of the edge routers 40 , 42 provided in the respective base stations 34 , 36 , instructs the relay router 48 , under which the edge router 40 and every edge router 42 of the base station 36 as a candidate destination are connected, to buffer the packet data from the correspondent node, and instructs the relay router 48 to forward the packet data buffered in the relay router 48 on the basis of the instruction, to the radio terminal unit 30 after the movement after the handover, and then the buffered packet data is forwarded to the radio terminal unit 30 .
  • the relay router 48 to buffer the packet data from the correspondent node is the relay router that has the minimum hop count from the radio terminal unit 30 among the relay routers under which all the candidate base stations as potential destinations are connected, out of the plurality of relay routers 44 - 48 connected in the hierarchical structure.
  • each edge router retains the location information about locations of adjacent edge routers and the relay routers connected to the adjacent edge routers, the relay router under which the previous edge router having being connected to the radio terminal unit 30 under a handover and every edge router as a candidate destination are connected is determined based on the retained location information, and the relay router thus determined is instructed to buffer the packet data from the correspondent node. This results in instructing the appropriate relay router to buffer the packet data from the correspondent node, at the time of detecting a handover in the base station, whereby the packet data to be transmitted to the radio terminal unit under the handover can be buffered well without occurrence of packet data reception loss.
  • the present embodiment is provided with the function of determining the relay router with the minimum hop count from the radio terminal unit 30 among the relay routers under which all the candidate base stations as potential destinations are connected, out of the plurality of relay routers connected in the hierarchical structure. This enables the relay router closest to the radio terminal unit 30 after the movement to be instructed to buffer the packet data from the correspondent node.
  • the present embodiment is also provided with the function of instructing the relay router buffering the packet data to forward the buffered packet data to the radio terminal unit 30 , after the movement by the handover of the radio terminal unit 30 .
  • This enables the instruction to forward the packet data from the correspondent node having been buffered in the relay router with the minimum hop count from the radio terminal unit, which is the relay router under which the base station having been connected before the movement to the radio terminal unit 30 and every base station as a candidate destination are connected.
  • the above relay router has the function of buffering the packet data from the correspondent node in accordance with the packet data buffering instruction from the edge router, capsulating the buffered packet data with the destination address of the radio terminal unit 30 in accordance with the packet data forwarding instruction from the edge router, providing it the packet identifier, and forwarding the capsulated data to the destination address. This permits the relay router to buffer the packet data to be transmitted to the radio terminal unit 30 , and to properly forward the buffered packet data to the radio terminal unit 30 after the movement.
  • the radio terminal unit 30 memorizes the address for identification of the radio terminal unit in the relay router during the handover, receives the capsulated data forwarded from the relay router, and, if in this received packet data there exists the same address as the memorized address, acquires the packet data provided with the same address.
  • the edge router or the radio terminal unit generates the buffering instruction message to the relay router when there occurs a change of the relay router, when the radio terminal unit needs to change the buffer volume of the relay router, or when an expiration date of the buffer becomes close. It is, however, also contemplated to employ a method of notifying all the radio terminal units of the default buffer value along with RA (Router Advertisement), instead of letting each radio terminal unit perform the message exchange with the relay router, when consideration is given to large-scale networks.
  • the buffering instruction message is resent at predetermined intervals before reception of a response upon actual reception of packet data ⁇ BA (Buffer Acknowledgement) ⁇ .
  • the packet data is deleted in chronological order from the oldest.
  • the timing of sending of BC is determined for the purpose of updating the expiration date before the expiration date of the assigned buffer and for the purpose of preventing the assigned buffer area from becoming full.
  • the above method is implemented as described later by inserting a sequence number or a timestamp in the header outside each capsulated data transmitted from the relay router to the radio terminal unit.
  • the capsulation technology is used for the forwarding data between the relay router and the radio terminal unit as described previously, and, because the header used for the capsulation is generated in the relay router, it can be freely configured without need for consideration to the problem of security as can occur upon rewriting of packet data transmitted from the correspondent node as a sender. For this reason, an option header indicating a sequence number or a timestamp of arriving packet data is introduced into the header of capsulated data. Filled in this option is a sequence number in which each packet addressed to the same radio terminal unit has arrived at the relay router. Since this value can possibly increase without a limit, the modulo of a maximum value that the prepared field can take, and it is reused at intervals of a certain period.
  • the maximum sequence number or timestamp of the packets received before the handover is marked in the aforementioned forwarding instruction message sent after the handover.
  • the relay router receiving the forwarding instruction message, deletes the packet data up to the packet data marked in the forwarding instruction message and forwards the packet data thereafter to the radio terminal unit. All the foregoing messages can be sent together with the data packets or signaling packets used in Mobile IP.
  • the relay router has the function of providing the identifier of data on the occasion of forwarding the buffered data to the radio terminal unit in accordance with the forwarding instruction from the edge router, the base station, or the radio terminal unit. This permits the relay router to generate the identifier and thus makes it feasible to freely configure the identifier without consideration to the problem of security as can occur upon rewriting of packet data sent from the correspondent node as a sender.
  • the radio terminal unit has the function of negotiating the buffer size of data from the correspondent node with the relay router. More specifically, the radio terminal unit transmits information about how much volume should desirably be allocated as the buffer size of data from the correspondent node, to the relay router. This permits the relay router to allocate only the necessary buffer size and thus makes it feasible to perform efficient data buffering.
  • the radio terminal unit also has the function of notifying the relay router of information about already-received data at the radio terminal unit itself, before excess over the buffer size determined by the above negotiation in the relay router. This permits the relay router to know which data has been received by the radio terminal unit at the forwarding address of buffered data during the buffering of data from the correspondent node.
  • the relay router also has the function of deleting data in chronological order from the oldest on the occasion of performing the data buffering over the date buffer size determined by the negotiation. This permits the relay router to buffer data in order from the newest if the buffered data exceeds the buffer size during the buffering of data from the correspondent node.
  • the relay router also has the function of deleting already-received data notified of by the radio terminal unit. This permits the relay router to delete data already received by the radio terminal unit, on the occasion of buffering the data from the correspondent node, whereby it is feasible to implement efficient data buffering.
  • the radio terminal unit has the function of notifying the relay router of the information about already-received data before the handover, after the handover. This permits the relay router to know which data has been received before the handover by the radio terminal unit at the forwarding address.
  • the relay router also has the function of deleting the already-received data before the handover notified of by the radio terminal unit and forwarding data other than it to the radio terminal unit. This permits the relay router to delete the data already received before the handover by the radio terminal unit out of the buffered data and to forward the data other than it to the radio terminal unit, and thus makes it feasible to forward only necessary data, thereby implementing efficient data forwarding and avoiding duplicate reception of data.
  • the above embodiment was configured to determine the relay router under which the previous edge router having been connected to the radio terminal unit 30 under the handover and every edge router as a candidate destination are connected, based on the location information retained in the edge router, upon detection of the handover, and to instruct the relay router thus determined to buffer the packet data from the correspondent node (buffering instruction), but it is also possible to modify the configuration so as to perform the determination of the relay router and the buffering instruction, prior to the detection of the handover (i.e., regardless of the detection of the handover).
  • the data transmitted to the radio terminal unit 30 before execution of the handover is buffered in the relay router and transmitted through the previous edge router to the radio terminal unit 30 .
  • the relay router transmits the data with an identifier through the previous edge router to the radio terminal unit 30 .
  • the relay router capsulated the buffered packet data addressed to the address A, with the destination address B being added thereto and transmitted the capsulated data to the address B, and the radio terminal unit 30 received and decapsulated the packet data 91 addressed to B.
  • this may also be modified, as shown in FIG. 5, so that the relay router, receiving the packet data 95 to the address A containing the address HA set at the time of registration of the radio terminal unit 30 , rewrites the packet data into the packet data addressed to the address B, using the address HA as a key, and transmits it to the radio terminal unit 30 after the movement.
  • the present invention is applicable to mobile communication systems and, particularly, to the handover control apparatus, base stations, edge routers, relay routers, radio terminal units, and handover control methods used in the mobile communication systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
US10/399,785 2001-08-27 2002-08-26 Handover control, apparatus, base station, edge router, relay router, radio terminal apparatus, mobile communication system, and handover control method Abandoned US20040005893A1 (en)

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US11/692,126 US7424295B2 (en) 2001-08-27 2007-03-27 Handover control apparatus, base station, edge router, relay router, radio terminal unit, mobile communication system, and handover control method

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JPP2001-256760 2001-08-27
JP2001256760A JP2003069617A (ja) 2001-08-27 2001-08-27 ハンドオーバ制御装置、基地局、エッジルータ、中継ルータ、無線端末機、移動通信システム及びハンドオーバ制御方法
PCT/JP2002/008581 WO2003019880A1 (fr) 2001-08-27 2002-08-26 Appareil de gestion de transfert intercellulaire, station de base, routeur de frontiere, routeur relais, appareil a terminal radio, systeme de communication mobile et procede de gestion de transfert intercellulaire

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050083905A1 (en) * 2003-09-04 2005-04-21 Katsutoshi Nishida Communication system and communication control method
US20050169205A1 (en) * 2003-08-21 2005-08-04 Francesco Grilli Methods for seamless delivery of broadcast and multicast content across cell borders and/or between different transmission schemes and related apparatus
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US20070189221A1 (en) 2007-08-16
WO2003019880A1 (fr) 2003-03-06
CN1473421A (zh) 2004-02-04
EP1422883A4 (fr) 2008-07-02
US7424295B2 (en) 2008-09-09
CN100493027C (zh) 2009-05-27
JP2003069617A (ja) 2003-03-07
EP1422883B1 (fr) 2012-07-11

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