JP2005094806A - Radio mobile communication method and radio base station, and radio resource management apparatus and mobile communication terminal, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a time required for searching a move destination even if a radio frequency used to communicate with a plurality of radio base stations is different when a mobile terminal device communicating with a radio base station via a radio communication path performs hand-over. <P>SOLUTION: A radio base station reports information relating to a radio frequency used by a radio base station adjacent to the present station, to a mobile terminal device as adjacent radio base station system information. The mobile terminal device receives this adjacent radio base station system information and defines only the radio frequency indicated therein as a monitor target. Thus, the mobile terminal device can shorten the time required for searching the move destination, thereby power consumption of the mobile terminal device is suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radio mobile communication method, a radio base station, a radio resource management apparatus, a mobile terminal apparatus, and a program, and in particular, mobile communication capable of performing high-speed handover to a mobile terminal apparatus that changes a radio base station with which communication is performed. It relates to the method.

    In the mobile communication system, there is Mobile IP technology developed in the Internet Engineering Task Force (IETF) in order to guarantee the reachability of unicast packets to mobile terminal devices (see Non-Patent Document 1). In this Mobile IP, first, it is assumed that the mobile terminal apparatus belongs to an arbitrary link in an arbitrary management domain in advance and an address is assigned through this link. At this time, a management domain and a link to which the mobile terminal device belongs are called a home domain and a home link, and an address assigned in advance is called a home address. In addition, a mobility management agent is arranged on the home link, and this is called a home agent.

  When this mobile terminal device moves to another link in the home domain or a link in a different management domain, it notifies the home agent of its own home address and the temporary address acquired at the current link = care-of address. . When a packet addressed to the mobile terminal device arrives, the home agent creates a packet addressed to the care-of address, encapsulates the original packet and transfers it. With the above procedure, the reachability of the unicast packet to the mobile terminal apparatus is guaranteed.

  As a means for shortening the time required for assigning a care-of address in Mobile IP, there is Fast Handovers for Mobile IPv6 (FMIP) technology under study by IETF (see Non-Patent Document 2). In this technology, before executing handover, a new care-of address used in a management domain as a movement destination is notified to a radio base station (movement source radio base station) in the management domain currently connected. The source radio base station that has received the notification of the new care-of address stores the correspondence between the care-of address currently assigned to the mobile terminal device and the new care-of address. Thereafter, when a packet addressed to the mobile terminal device arrives, a packet addressed to a new care-of address is created, and the original packet is encapsulated and transferred. Thus, after the mobile terminal device disconnects the wireless link before moving, even if the IP packet to reach the mobile terminal device arrives at the source wireless base station with the old care-of address as the destination, packet loss due to unknown destination In addition, it is possible to prevent the overhead for packet retransmission.

C. Perkins (IBM), “IP Mobility Support”, IETF, p. 8-11 (Section 1.7), Internet <URL: http: // www. ietf. org / rfc / rfc2002. txt> Rajeev Kodli (Nokia Research Center), “Fast Handovers for Mobile IPv6 (FMIP)”, IETF, p. 4-9, Internet <URL: http: // www. ietf. org / internet-drafts / draft-ietf-mobileip-fast-mipv6-05. txt>

  As described above, in the FMIP technology, a tunnel for transferring a packet arriving at a pre-movement radio base station to a movement-destination radio base station is set before the handover is executed, and the packet is transferred at the radio base station. This prevents the loss and retransmission overhead of IP packets, and in Mobile IP, notifies the home agent or the correspondent node of a request for changing the packet transmission destination to the wireless base station after moving. In addition, the time required for handover at the network layer (layer 3) level can be reduced.

  However, there is a problem that the FMIP technology is not intended for the process of switching the radio link layer (layer 2). For this reason, in connection-oriented communication in which a radio channel is established before data transmission / reception is started and a virtual circuit is established, even if FMIP technology is applied, handover by a radio channel reservation procedure that occurs after switching of radio links is performed. The time cannot be shortened.

  Further, the FMIP technique has a problem that it is not assumed that there are a plurality of base stations that can be a destination. In general, in the case of a wireless communication system, there are often a plurality of base stations that can be destinations. Further, the amount of radio resources that each radio base station can provide is different. In order to maximize the accommodation efficiency of the entire radio communication system, it is desirable to select an appropriate radio base station according to the radio resource amount required by the mobile terminal apparatus.

  An object of the present invention is to search only for a radio system used by a radio base station in a communication range of a mobile terminal apparatus when there are a plurality of radio systems used for communication with the radio base station. , A mobile radio communication method, a radio base station, a radio resource management device, and a mobile terminal device capable of reducing the time required for searching for a destination radio base station and suppressing power consumption of the mobile terminal device As well as providing a program.

  A radio base station according to the present invention performs packet communication that is connected to a plurality of radio base stations and a first radio base station included in the plurality of radio base stations via a radio link and is delivered to a unique destination by a network layer protocol. A radio base station in a radio mobile communication system comprising a mobile terminal device, wherein the first radio base station is adjacent to the first radio base station in a cell range among the plurality of radio base stations. It is characterized in that information on the type of radio used by a given radio base station is periodically reported as adjacent radio base station system information.

  A mobile terminal apparatus according to the present invention performs packet communication that is connected to a plurality of radio base stations with a first radio base station included in the plurality of radio base stations via a radio link and is delivered to a unique destination by a network layer protocol. A mobile terminal apparatus in a radio mobile communication system comprising a mobile terminal apparatus equipped with a plurality of types of radio interfaces, wherein the mobile terminal apparatus is a radio base adjacent to the first radio base station in a cell range Receiving information related to a radio type used by a station as neighboring radio base station system information, and making the radio base station indicated by the neighboring radio base station system information a search target as a candidate for a destination radio base station And

  A wireless mobile communication method according to the present invention includes a packet communication that is connected to a plurality of wireless base stations and a first wireless base station included in the plurality of wireless base stations via a wireless link and is delivered to a unique destination by a network layer protocol. A mobile communication method in a wireless mobile communication system including a mobile terminal device equipped with a plurality of types of wireless interfaces, wherein the wireless mobile terminal device includes a plurality of wireless base stations to which the wireless base station is connected. The first radio base station is adjacent to the first radio base station in the cell range among the plurality of radio base stations. Information regarding the type of radio used by the radio base station being used is periodically broadcast as adjacent radio base station system information, and the mobile terminal device normally has one radio When the neighboring radio base station system information transmitted from the first radio base station is received, a different radio system is used according to the received neighboring radio base station system information. And detecting a destination candidate radio base station by enabling the radio system used by the heterogeneous radio system adjacent radio base station when it detects that there is a different radio system adjacent radio base station. .

  A radio resource management apparatus according to the present invention includes a plurality of radio base stations, a mobile terminal apparatus connected to a first radio base station included in the plurality of radio base stations via a radio link, and the plurality of radio base stations. A radio resource management apparatus having a function of managing radio resources, wherein the plurality of radio base stations, the mobile terminal apparatus, and the radio resource management apparatus have a function of performing packet communication delivered to a unique destination by a network layer protocol; A radio resource management apparatus in a radio mobile communication system, wherein the radio resource management apparatus is used by a radio base station adjacent to the first radio base station in a cell range among the plurality of radio base stations. Information regarding the radio type is periodically notified as adjacent radio base station system information.

  According to another radio mobile communication method of the present invention, a plurality of radio base stations and a first radio base station included in the plurality of radio base stations are connected by a radio link and delivered to a unique destination by a network layer protocol. A mobile terminal apparatus equipped with a plurality of types of radio interfaces for performing packet communication, and a radio resource management apparatus having a function of managing radio resources of the plurality of radio base stations, the plurality of radio base stations and the mobile terminal apparatus And the radio resource management apparatus is a mobile communication method in a radio mobile communication system having a function of performing packet communication delivered to a unique destination by a network layer protocol, wherein the radio mobile terminal apparatus determines a radio base station to which the radio base station is connected. A handover is executed by changing to a second radio base station included in the plurality of radio base stations. In order to do so, the radio resource management device periodically reports information on a radio type used by a radio base station adjacent to the first radio base station as neighboring radio base station system information, The mobile terminal apparatus normally performs communication with only one radio system enabled, and receives the neighboring radio base station system information transmitted from the radio resource management apparatus, the received neighboring radio base station system information By detecting that a different radio system adjacent radio base station using a different radio system is present, the radio system used by the different radio system adjacent radio base station is also enabled and the destination candidate radio base is enabled. It is characterized by searching for a station.

  According to another aspect of the present invention, there is provided a wireless mobile communication method in which a plurality of wireless base stations and a first wireless base station included in the plurality of wireless base stations are connected by a wireless link and delivered to a unique destination by a network layer protocol. A mobile terminal device equipped with a plurality of types of radio interfaces for performing packet communication, and a radio resource management device having a function of managing radio resources of the plurality of radio base stations, the plurality of radio base stations and the mobile terminal Apparatus and radio resource management apparatus are mobile communication methods in a radio mobile communication system having a function of performing packet communication delivered to a unique destination by a network layer protocol, wherein the radio mobile terminal apparatus is connected to a radio base station Is a handover to a second radio base station included in the plurality of radio base stations In order to realize, the radio resource management apparatus is notified of the radio interface to be installed, information about its own current position, or a combination of the type of radio interface to be installed and information about its current position, and the radio resource management apparatus Transmits information on a radio type used by a radio base station that is adjacent to the first radio base station as neighboring radio base station system information to the mobile terminal device, and the mobile terminal device Performs communication with only one radio system enabled and receives the neighboring radio base station system information transmitted from the radio resource management device, and uses a different radio system depending on the received neighboring radio base station system information. If it is detected that there is an adjacent wireless base station in the different wireless system, Radio system system adjacent wireless base station is also used to enable, it characterized in that searching for a destination candidate radio base station.

  A program according to the present invention is a mobile terminal that performs packet communication connected to a plurality of radio base stations and a first radio base station included in the plurality of radio base stations via a radio link and delivered to a unique destination by a network layer protocol. A program for causing a computer to execute an operation of the first radio base station in a radio mobile communication system including a device, and being adjacent to the own station and a cell range among the plurality of radio base stations It includes a process of periodically informing information on the type of radio used by the radio base station as adjacent radio base station system information.

  Another program according to the present invention performs packet communication with a plurality of radio base stations and a first radio base station included in the plurality of radio base stations via a radio link and delivered to a unique destination by a network layer protocol. A program for causing a computer to execute an operation of a mobile terminal apparatus in a wireless mobile communication system including a mobile terminal apparatus equipped with a plurality of types of radio interfaces, the program being adjacent to the first radio base station and a cell range. Information on the type of radio used by the radio base station being used is received as adjacent radio base station system information, and the radio base station indicated by the adjacent radio base station system information is searched as a candidate for a destination radio base station. Including a process to perform.

  According to the present invention, even when the radio frequencies used for communication with a plurality of radio base stations are different from each other, the radio base station apparatus obtains information on the radio type used by the radio base station adjacent to the own radio base station. The mobile terminal device notifies the mobile terminal device as adjacent radio base station system information, and the mobile terminal device monitors only the radio frequency notified by the received adjacent radio base station system information. It is possible to reduce the time required for the mobile terminal device and to suppress the power consumption of the mobile terminal device.

  Next, embodiments of the present invention will be described in detail. First, a case of a radio resource distributed management mode in which radio base stations constituting a radio communication system have independent radio resource management functions will be described. FIG. 1 shows a configuration example of the entire radio communication system in such a case. In the wireless communication system of FIG. 1, a mobile terminal apparatus (here, MN) 110, wireless base stations (here, AR-1, AR-2, AR-3) 121, 122, 123, wireless transmission paths 131, 132 , Comprising a wired network 140.

  On mobile terminal apparatus 110, communication is performed using a plurality of communication sessions (here, first to fourth communication sessions) having different communication quality (Quality of Service, QoS) requests.

  Hereinafter, “pre-movement radio base station”, “movement destination radio base station”, and “movement destination candidate radio base station” are respectively used as the following meanings. The “pre-movement radio base station” is a radio base station that performs communication with the mobile terminal apparatus when the mobile terminal apparatus determines handover. A “destination radio base station” is a radio base station that communicates with a mobile terminal device after completion of handover of the mobile terminal device. Furthermore, the “destination candidate radio base station” is a radio base station selected as a candidate for the destination base station during the handover process of the mobile terminal apparatus (a plurality of radio base stations can exist simultaneously).

  FIG. 2 shows a first example of the configuration of the radio base station (AR-1) 121 configuring FIG. The radio base stations AR-2 and AR-3 have the same configuration. The radio base station AR-1 includes a first transmission / reception unit 210, a second transmission / reception unit 220, a handover processing unit 230, a radio base station resource information storage unit 240, a radio channel management unit 250, and a movement destination radio base station determination unit 260. It has.

  The first transmission / reception unit 210 is a device for performing data transmission / reception with respect to the wireless transmission path 131 and includes a reception state monitoring unit 211 for monitoring the state of the wireless transmission path. The reception state monitoring unit 211 has a function of notifying the handover processing unit 230 when detecting that the state of the wireless transmission path has deteriorated so that communication with the mobile terminal device cannot be continued.

  The second transmission / reception unit 220 is a device for performing data transmission / reception with respect to the wired communication network 140. The handover processing unit 230 is used for performing a handover process at the network layer level based on the Mobile IP and the Fast Mobile IP.

  The radio base station resource information storage unit 240 is used to store radio resource information notified from radio base stations located in the vicinity. The destination radio base station determination unit 260 includes the requested radio resource amount of the mobile terminal device notified from the mobile terminal device, the radio resource information of the neighboring radio base station stored in the radio base station resource information storage unit 230, This is an apparatus for selecting a candidate for a radio base station to be a handover destination of a mobile terminal apparatus, using information on a radio channel usage state in a radio channel management unit.

  The radio channel management unit 250 is a device for managing a radio channel of a radio transmission path used for communication with a mobile terminal device. Further, the radio channel management unit 250 has a function of performing processing related to securing, releasing, and reservation of radio channels in response to requests from mobile terminal devices and other radio base stations.

Hereinafter, an operation when the radio base station receives a message related to handover will be described.
(1) When it is a movement destination radio base station:
a. The communication session on the mobile terminal device is connectionless communication;
Upon receiving the Handover Initiate (HI) message transmitted from the source radio base station, the handover processing unit 230 generates a Handover Acknowledgment (HACK) message including information on a new IP address to be allocated to the mobile terminal device. Transmit to the radio base station. In addition, when receiving a Fast Neighbor Advertisement (F-NA) message transmitted from the mobile terminal apparatus after the handover is performed, the handover processing unit 230 executes a process for starting packet transmission toward the mobile terminal apparatus.

b. The communication session on the mobile terminal device is connection-oriented communication;
In addition to the operation when the communication session on the mobile terminal device is connectionless communication, the radio channel management unit 250 is designated by the resource reservation request message when receiving the resource reservation request message transmitted by the source wireless base station. Reserving a radio channel that can satisfy radio resources.

(2) When it is a pre-movement radio base station:
a. The communication session on the mobile terminal device is connectionless communication;
When the handover processing unit 230 receives the destination base station request message for the connectionless communication transmitted by the mobile terminal apparatus 110, the handover processing unit 230 converts the packet received to the mobile terminal apparatus into the destination radio specified by the destination base station request message. In order to generate a tunnel to be transferred to the base station, an HI message is transmitted to the destination radio base station, and a HACK message transmitted from the destination radio base station is waited for. Further, the handover processing unit 230 generates a destination base station advertisement message including information on a new IP address used for communication with the destination radio base station, and transmits the message to the mobile terminal device 110. Further, when the handover processing unit 230 receives a Fast Binding Update (F-BU) message indicating execution of handover of the mobile terminal apparatus 110, the handover processing unit 230 transmits a Fast Binding Acknowledgment (F-BACK) message as a response. Thereafter, the handover processing unit 230 executes processing for transferring the packet addressed to the mobile terminal apparatus 110 to the movement-destination radio base station.

b. The communication session on the mobile terminal device is connection-oriented communication;
The handover processing unit 230 receives a destination base station request message for connection-oriented communication transmitted from the mobile terminal apparatus 110 performing connection-oriented communication, or transmits a wireless transmission path from the reception state monitoring unit 211. When the notification that the quality has deteriorated is received, the destination radio base station determination unit 260 is requested to select a radio base station that is a destination candidate. The destination radio base station determination unit 260 includes the resource amount requested by the communication session included in the selected destination base station request message, the resource information of other radio base stations stored in the radio base station resource information storage unit 240, and Then, using the wireless channel empty information managed by the wireless channel management unit 250, a wireless base station to be a destination is selected. In addition, when the radio base station resource information storage unit 240 receives the destination base station request destination message for connection-oriented communication transmitted by the mobile terminal apparatus 110, each radio base station resource information storage unit 240 includes each of the destination base station request destination messages. A resource securing request message for securing the radio resource requested for the communication session is transmitted to the destination radio base station.

  FIG. 3 shows a configuration example of the mobile terminal apparatus (MN) 110 constituting FIG. The mobile terminal device MN includes a transmission / reception unit 310, a handover processing unit 320, a movement destination radio base station determination unit 330, and a radio channel management unit 340. The transmission / reception unit 310 is a device for performing transmission / reception of data to / from the wireless transmission path 131, and includes a reception state monitoring unit 311 for monitoring the state of the wireless transmission path. The reception state monitoring unit 311 has a function of notifying the handover processing unit 320 when detecting that the state of the wireless transmission path has deteriorated so that communication cannot be continued. The handover processing unit 320 is used to perform a network layer level handover process based on Mobile IP and Fast Mobile IP.

  The destination radio base station determination unit 330 is a device for selecting a radio base station that is a destination using radio resources required for a communication session, resource information of radio base stations, and the like. The radio channel management unit 340 is a device for managing a radio channel used for communication with a radio base station.

  FIG. 4 shows an outline of a handover procedure related to the mobile terminal apparatus MN and the radio base stations AR-1, AR-2, AR-3 in the case of the radio resource distributed management mode. The handover process is roughly realized by the following five steps.

(1) Procedure for exchanging radio resource information between radio base stations for sharing radio resource information between radio base stations (procedure P401 in FIG. 4)
(2) A handover execution start procedure (procedure P402 in FIG. 4) in which execution of handover is determined and pre-processing for handover execution is performed.
(3) A radio resource securing procedure (procedure P403 in FIG. 4) for securing a radio resource required by a communication session executed on the mobile terminal apparatus on the radio base station serving as a movement destination
(4) Handover destination notification procedure (step P404 in FIG. 4) for notifying the destination wireless base station and the wireless channel used for communication with the destination wireless base station. FMIP packet transfer procedure to be performed (procedure P405 in FIG. 4).

  FIG. 5 shows a first example of the processing procedure of the radio resource information procedure between radio base stations shown as P401 in FIG. Hereinafter, this procedure will be described in detail with reference to FIGS. 2, 5, 7, and 8.

  (Step 1) When the radio base station AR-1 resource information exchange section 270 of the radio base station AR-1 determines that the resource information of the radio base station AR-2 is necessary, a radio resource information request message in the format shown in FIG. Is transmitted to the nearby radio base station AR-2 (message 501 in FIG. 5).

  (Step 2) When the radio resource information exchange unit 270 of the radio base station AR-2 receives the radio resource information request message 501, the radio resources managed by the reception state monitoring unit 211 and the radio channel management unit 250 A radio resource information report message of the format shown in FIG. 8 including the information on is generated and transmitted to the radio base station AR-1 (message 502 in FIG. 5).

  (Step 3) Upon receiving the radio resource information notification message 502, the radio base station resource information exchange unit 270 of the radio base station AR-1 stores the reported radio resource information in the radio base station resource information storage unit 240. (Procedure 503 in FIG. 5).

  In addition, the radio base station AR-1 performs the same procedure for the radio base station AR-3. By the above procedure, for example, immediately after the power of the destination radio base station determination unit 260 of the radio base station AR-1 is not turned on, information on other radio base stations is not immediately included. Station information can be acquired.

  Next, FIG. 6 shows a second example of the processing procedure of the radio resource information procedure P401 between radio base stations in FIG. Hereinafter, this procedure will be described in detail with reference to FIGS. 2, 6, and 8.

  (Step 1) The resource information exchange unit 270 between the radio base stations of the radio base station AR-1 includes information on the radio channel managed by the reception state monitoring unit 211 and the radio channel management unit 250 in the period TAR1-AR2. The radio resource information report message is generated and transmitted to the radio base station AR-2 (messages 601 and 605 in FIG. 6). Similarly, the radio resource information report message (602, 606) is generated and transmitted to the radio base station in a cycle T AR1-AR3.

  (Step 2) Upon receiving the radio resource information notification messages 602 and 606, the radio base station resource information exchanging unit 270 of the radio base station AR-2 stores the reported radio resource information in the radio base station resource information storage unit 240. Store (procedures 611 and 616 in FIG. 6).

  Further, the trigger for transmitting the radio resource information request message is not limited to periodic transmission. For example, as shown in the operation of the radio base station AR-2 in FIG. 6, the radio resource information request message is transmitted to the radio base stations AR-1 and AR-3 in response to the internal radio resource allocation state change 613. There is also a method (messages 603 and 604 in FIG. 6).

  5 and 6, information recorded in the radio base station resource information storage unit 240 of the radio base station that has received the radio resource information report message includes recently received radio resource information, There are statistical information on changes in received radio resource information.

  FIG. 7 shows a packet format of the radio resource information request message used in FIG. The radio base station AR-1 generates a message including a type number meaning a radio resource request message, and assigns, for example, a UDP / IP packet header addressed to the radio base stations AR-2 and AR-3. Transmit to the wired communication network 140.

  FIG. 8 shows a packet format of the radio resource information report message used in FIG. 5 and FIG. When the radio base station receives the resource request message, the radio base station generates a message 801 including information on the radio resource of the base station, and adds information including a type number indicating a radio resource information report. Further, for example, a UDP / IP packet header, which is addressed to the transmission source wireless base station of the wireless resource information report message, is added and transmitted to the wired communication network 140.

  FIG. 9 shows an example of detailed information included in the radio resource information 801 in FIG. Examples of what is reported as the wireless quality information include “service types provided by the wireless communication system and the number of empty channels that can be used therefor”. Further, as other information, there is quality information of the radio transmission path measured by the radio base station such as “bit error rate, SIR, data transmission rate, transmission delay between mobile terminal apparatus and radio base station”. Still another information is related to the type of radio system used by the radio base station for communication with the mobile terminal apparatus, such as “radio system type identifier, radio frequency, scramble code”.

  Next, FIG. 10 shows an example of the processing procedure of the radio resource securing procedure P403 of FIG. Hereinafter, the procedure in the case where the radio base station AR-1 requests the radio base station AR-2 to secure radio resources will be described in detail with reference to FIGS.

  (Step 0) As a result of the handover execution start procedure P402 of FIG. 4, the handover processing unit 230 of the radio base station AR-1 is transferred from the mobile terminal device MN or the destination radio base station determination unit 260 of the radio base station AR-1. AR-2 is notified as the destination radio base station.

  (Step 1) The handover processing unit 230 of the radio base station AR-1 performs preparatory processing for packet transfer toward the destination radio base station AR-2, and then identifies the identifier of the mobile terminal device MN and the mobile terminal device. A resource securing request message of the format shown in FIG. 36 including information on the radio resource requested by the communication session on the MN is transmitted to the destination radio base station AR-2 (message 1001 in FIG. 10).

  (Step 2) Upon receiving the source reservation request message 1001, the handover processing unit 230 of the radio base station AR-2 performs processing for accepting a packet transferred from the radio base station, and then performs a process to the radio channel management unit 250. On the other hand, a radio channel that satisfies the radio resource requested by the communication session included in the source reservation request message 1001 is reserved (procedure 1011 in FIG. 10).

  (Step 3) The handover processing unit 230 of the radio base station AR-2 includes information on the IP address used by the mobile terminal device MN after the handover, information on packet transfer between the radio base stations AR-1 and AR-2, and A resource reservation response message of the format shown in FIG. 37 including information on the channel number of the radio channel reserved for the communication session on the mobile terminal device MN is transmitted to the radio base station AR-1 (FIG. 10). Message 1002).

  Also, since the radio base station AR-2 changes its internal radio resource state at the time when radio resources are secured as a result of the procedure 1011, the radio base station AR-1 and AR-3 are connected to the radio base station AR-2 shown in FIG. A resource information report message is being sent.

  Next, FIG. 11 shows an example of the processing procedure of the handover destination notification procedure P404 in FIG. Hereinafter, the handover destination notification procedure will be described in detail with reference to FIGS. 2, 3, 11, and 35.

  (Step 0) As a result of the radio resource securing procedure P403, the handover processing unit of the radio base station AR-1 acquires information on the radio channel reserved for the mobile terminal device MN by the radio base station AR-2. .

  (Step 1) The handover processing unit of the radio base station AR-1 includes information on the reserved radio channel that the mobile terminal device MN will use for communication with the destination radio base station and information on the IP address. However, the destination radio base station advertisement message in the format shown in FIG. 35 is transmitted to the mobile terminal device MN (procedure 1101 in FIG. 11).

  (Step 2) The handover processing unit 320 and the radio channel management unit 340 of the radio terminal 110 acquire information on the new IP address and radio channel notified by the destination radio base station advertisement message 1101, respectively, and prepare for execution of the handover. .

  FIG. 41 shows an example of a detailed procedure of the FMIP packet transfer procedure P405 of FIG. For this procedure, the procedure shown in Non-Patent Document 2 that defines FMIP can be applied.

  The procedure of the first embodiment of the present invention will be described with reference to FIGS. 2, 3, 12, 32, 33, 34 and 39.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal device MN receives beacon signals periodically transmitted from the radio base stations AR-1, AR-2, and AR-3, and compares the reception states (see FIG. 12 procedures 1211).

  (Step 2) In the mobile terminal apparatus MN, the reception state monitoring unit 311 finds that there is a radio base station whose reception state is sufficiently better than the radio base station AR-1, or the mobile terminal device MN When a handover execution command is notified from the MN user, preparation for handover execution is started (procedure 1212 in FIG. 12).

  (Step 3) The movement destination radio base station determination unit 330 of the mobile terminal device MN determines the identifiers of the radio base stations AR-1, AR-2, AR-3 detected by the transmission / reception unit 310 and the radio base stations. A detected radio base station notification message of the format shown in FIG. 32 including communication quality information and information on the amount of resources required for the communication sessions 1 to 4 being executed on the mobile terminal device MN is sent to the radio base station AR- 1 (message 1201 in FIG. 12).

  (Step 4) Upon receipt of the detected radio base station notification message 1201, the handover processing unit 230 of the radio base station AR-1 uses the destination radio base station determination unit 260 as a radio base station to be a destination candidate. 1, AR-2, AR-3 are selected. As the determination criteria for the destination radio base station determination unit 260 to select the destination candidate radio base station, information acquired by the detected radio base station notification message 1201 and the radio base station resource information storage unit 240 are stored. The radio resource information of other radio base stations, billing information when each radio base station is used, and information on access authority for each radio base station of the mobile terminal apparatus MN can be considered.

  Selection of a movement destination candidate radio base station in the movement destination radio base station determination unit 260 is determined by the following means, for example. First, the “free radio resource amount” of each of the radio base stations AR-1, AR-2, AR-3 acquired from the radio base station resource information storage unit 240 and “necessary” of each communication session on the mobile terminal device MN. And the radio base station that can provide the radio resource amount required by the mobile terminal apparatus MN is selected. Next, the selected radio base station further notifies “a usage fee for using the radio base station” preset in each radio base station and a detected radio base station notification message 1201. Compared with the “charge limit”, a radio base station whose usage fee is lower than the charge limit is selected. Next, the selected wireless base station is a wireless base station provided by a communication company with which the mobile terminal device MN has a contract, or has a roaming contract with a contracted communication company, and the mobile terminal A radio base station having authority to use by the device MN is selected.

  (Step 5) The handover processing unit 230 of the radio base station AR-1 includes the destination radio base station notification message in the format shown in FIG. 33 including the radio base station selected as the destination candidate and information related to its communication quality. Is transmitted to the mobile terminal device MN (message 1202 in FIG. 12).

  (Step 6) The handover processing unit 320 of the mobile terminal device MN determines the radio base station AR-2 as the destination radio base station using the destination radio base station determination unit 330 (procedure 1214 in FIG. 12). The determination criteria for the destination radio base station determination unit 330 to determine the destination radio base station are information included in the destination candidate radio base station notification message 1202 and each radio base station detected by the reception state monitoring unit 311 There is a reception state from.

  Selection of a movement destination candidate radio base station in the movement destination radio base station determination unit 330 is determined by, for example, the following means. First, “communication quality information” of each destination candidate radio base station included in the destination candidate radio base station message is compared, and the radio base station with the best communication quality is determined as the destination radio base station.

  (Step 7) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-2 and information regarding the resource amount required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination wireless base station request message in the form is transmitted to the wireless base station AR-1 (message 1203 in FIG. 12).

  (Step 8) Using the procedure shown in FIG. 5, the radio base station AR-1 requests the radio base station AR-2 to secure radio resources (procedure P403 in FIG. 12).

  (Step 9) Using the procedure shown in FIG. 6, the radio base station AR-1 notifies the mobile terminal device MN of information related to the radio channel and IP address used for communication with the destination radio base station. (Procedure P404 in FIG. 12).

  FIG. 39 shows a communication session on the mobile terminal apparatus included in the detected radio base station notification message of the format shown in FIG. 32 and the destination radio base station request message of the format shown in FIG. It shows detailed information included in the required radio resource amount. The amount of radio resources requested by the mobile terminal device includes a bit error rate of transmission / reception data, a transmission rate of transmission / reception data, a data transmission delay of transmission / reception data, and a priority order of each item.

  Further, in steps 2 and 3 of the first embodiment, when there is only one destination candidate radio base station to be detected and notified by the mobile terminal apparatus MN, steps 3 to 6 in the above procedure can be omitted. It is. A processing procedure in this case is shown in FIG. 13 as a second embodiment of the present invention.

  Further, in step 4 of the first embodiment, when there is only one destination candidate radio base station selected by the radio base station AR-1, steps 5 to 7 in the above procedure can be omitted. . The processing procedure in this case is shown in FIG. 14 as a third embodiment of the present invention.

  In addition to the procedure shown in the third embodiment described above, a method is conceivable in which the radio base station AR-1 periodically notifies the radio terminal MN of radio resource information of the neighboring radio base stations. The processing procedure in this case is shown in FIG. 15 as a fourth embodiment of the present invention and will be described in detail below.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal apparatus MN receives beacon signals periodically transmitted from the radio base stations AR-1, AR-2, and AR-3, and measures the reception state (see FIG. 15 procedures 1511).

  (Step 2) The destination radio base station determination unit 260 of the radio base station AR-1 uses the radio resource information of the neighboring radio base stations acquired in the radio resource information exchange procedure P401 between radio base stations in the format shown in FIG. The mobile terminal apparatus MN is periodically notified using the destination candidate radio base station message (message 1501 in FIG. 15).

  (Step 3) The destination radio base station determination unit 330 of the mobile terminal device MN is notified by the reception state monitoring unit 311 that a radio base station whose reception state is sufficiently better than the radio base station AR-1 is detected. Then, the execution of the handover is determined (procedure 15111512 in FIG. 15).

  (Step 4) The movement destination radio base station determination unit 330 of the mobile terminal device MN moves the radio base station AR-2 using the radio resource information of the radio base station acquired by the movement destination candidate radio base station message 1501. The destination radio base station is determined (procedure 15121513 in FIG. 15).

  (Step 5) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-2 and information on the amount of resources required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination wireless base station request message in the format is transmitted to the wireless base station AR-1 (message 1502 in FIG. 15).

  (Step 6) The radio base station AR-1 uses the procedure shown in FIG. 5 to request the radio base station AR-2 to secure radio resources (procedure P403 in FIG. 15).

  (Step 7) Using the procedure shown in FIG. 11, the radio base station AR-1 notifies the mobile terminal device MN of information related to the radio channel and IP address used for communication with the destination radio base station. (Procedure P404 in FIG. 15).

  In each of the first to fourth embodiments, the mobile terminal apparatus side makes a handover start decision. On the other hand, a method of starting handover on the wireless network side is also conceivable.

  The procedure of the fifth embodiment of the present invention will be described with reference to FIGS. 2, 3, 16, 32, 33 and 34.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal apparatus MN receives beacon signals periodically transmitted from the radio base stations AR-1, AR-2, and AR-3, and measures the reception state (see FIG. 16 procedures 1611).

  (Step 2) The movement destination radio base station determination unit 330 of the mobile terminal apparatus communicates with the identifiers of the radio base stations AR-1, AR-2, AR-3 detected by the transmission / reception unit 310, and each radio base station. The detected radio base station notification message of the format shown in FIG. 32 including the quality information and the information on the resource amount required for the communication sessions 1 to 4 being executed on the mobile terminal device MN is sent to the radio base station AR-1 Is periodically transmitted (message 1601 in FIG. 16).

  (Step 3) The handover processing unit 230 of the radio base station AR-1 transmits the resource information of other radio base stations stored in the radio base station resource information storage unit 240 and the detected radio base station notification message to the radio base station. Using the reception state of the mobile terminal apparatus MN acquired in 1601, execution of the handover is determined (procedure 1612 in FIG. 16).

  (Step 4) The movement destination radio base station determination unit 260 of the radio base station AR-1 selects a movement destination candidate radio base station (procedure 1613 in FIG. 16).

  (Step 5) The handover processing unit 230 of the radio base station AR-1 includes the destination radio base station notification message in the format shown in FIG. 33 including the radio base station selected as the destination candidate and information related to its communication quality. Is transmitted to the mobile terminal device MN (message 1602 in FIG. 16).

  (Step 6) The handover processing unit 320 of the mobile terminal device MN determines the radio base station AR-2 as the destination radio base station using the destination radio base station determination unit 330 (procedure 1614 in FIG. 16).

  (Step 7) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-2 and information regarding the resource amount required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination wireless base station request message in the form is transmitted to the wireless base station AR-1 (message 1603 in FIG. 16).

  (Step 8) The radio base station AR-1 requests the radio base station AR-2 to secure radio resources using the procedure shown in FIG. 5 (procedure P403 in FIG. 16).

  (Step 9) Using the procedure shown in FIG. 11, the radio base station AR-1 notifies the mobile terminal device MN of information related to the radio channel and IP address used for communication with the destination radio base station. (Procedure P404 in FIG. 16).

  Further, in step 4 of the fifth embodiment, when there is only one destination candidate radio base station selected by the destination radio base station determination unit 260, steps 5 to 8 in the above procedure may be omitted. Is possible. The processing procedure in this case is shown in FIG. 17 as a sixth embodiment of the present invention.

  In each of the first to sixth embodiments, the mobile terminal device or the radio base station determines a destination radio base station, and then uses a method for securing radio resources of the destination radio base station. In these schemes, especially when a destination radio base station request message is transmitted from the mobile terminal device, the radio base station always sends a destination radio base station advertisement message before transmitting it to the mobile terminal device. It is necessary to perform a radio resource securing procedure with the radio base station.

  Therefore, at the time when the destination candidate radio base station is selected, the radio resources of all the destination candidate radio base stations are secured in advance, and from the reception of the destination radio base station request message in the radio base station, the destination A method for shortening the time until transmission of the radio base station advertisement message is conceivable. A processing procedure based on this method is shown in FIG. 18 as a seventh embodiment of the present invention, and will be described in detail below.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal device MN receives beacon signals periodically transmitted from the radio base stations AR-1, AR-2, and AR-3, and compares the reception states (see FIG. 18 procedures 1811).

  (Step 2) In the mobile terminal apparatus MN, the reception state monitoring unit 311 finds that there is a radio base station whose reception state is sufficiently better than the radio base station AR-1, or the mobile terminal device MN When a handover execution command is notified from the MN user, preparation for handover execution is started (procedure 1812 in FIG. 18).

  (Step 3) The movement destination radio base station determination unit 330 of the mobile terminal device MN determines the identifiers of the radio base stations AR-1, AR-2, AR-3 detected by the transmission / reception unit 310 and the radio base stations. A detected radio base station notification message of the format shown in FIG. 32 including communication quality information and information on the amount of resources required for the communication sessions 1 to 4 being executed on the mobile terminal device MN is sent to the radio base station AR- 1 (message 1801 in FIG. 18).

  (Step 4) Upon receipt of the detected radio base station notification message 1801, the handover processing unit 230 of the radio base station AR-1 uses the destination radio base station determination unit 260 as the radio base station to be a destination candidate. 1, AR-2, AR-3 are selected (procedure 1813 in FIG. 18). As a determination criterion for the destination radio base station determination unit 260 to select the destination candidate radio base station, information acquired by the detected radio base station notification message 1301 and the information stored in the radio base station resource information storage unit 240 The radio resource information of other radio base stations, billing information when each radio base station is used, and information on access authority for each radio base station of the mobile terminal apparatus MN can be considered.

  (Step 5) The handover processing unit 230 of the radio base station AR-1 uses the procedure shown in FIG. 5 for each of the radio base stations AR-2 and AR-3 selected in Step 4 above. The station AR-2 is requested to secure radio resources (procedure P403 in FIG. 18).

  (Step 6) The handover processing unit 230 of the radio base station AR-1 includes a destination of the format shown in FIG. 33 including information on the communication quality of the destination candidate radio base stations AR-1, AR-2, AR-3. A candidate radio base station notification message is transmitted to the mobile terminal device MN (message 1802 in FIG. 18).

  (Step 7) The handover processing unit 320 of the mobile terminal device MN determines the radio base station AR-2 as the destination radio base station using the destination radio base station determination unit 330 (procedure 1814 in FIG. 18). The determination criteria for the destination radio base station determination unit 330 to determine the destination radio base station include information included in the destination candidate radio base station notification message 1802 and each radio base detected by the reception state monitoring unit 311. There is reception from the station.

  (Step 8) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-2 and information regarding the resource amount required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination wireless base station request message in the form is transmitted to the wireless base station AR-1 (message 1803 in FIG. 18).

  (Step 9) Upon receiving the destination radio base station request message 1803, the handover processing unit 230 of the radio base station AR-1 uses the procedure shown in FIG. Information on the radio channel and IP address used for communication with the base station is notified (procedure P404 in FIG. 18).

  (Step 10) The handover processing unit 230 of the radio base station AR-1 moves a resource release request message in the format shown in FIG. 40, including information on the number of the radio channel to be released after the handover of the mobile terminal device MN is completed. Transmission is performed toward the radio base station AR-3 not selected as the destination radio base station (message 1825 in FIG. 18).

  (Step 11) Upon receiving the resource release request message 1825, the handover processing unit 230 of the radio base station AR-3 releases the radio channel specified by the resource release request message (procedure 1833 in FIG. 18).

  In each of the first to seventh embodiments described above, each radio base station needs to have a means for storing resource information of other radio base stations therein. On the other hand, for the purpose of reducing the configuration cost of the radio base station, a scheme in which the radio base station does not store radio resource information of other radio base stations is also conceivable. A processing procedure based on this method will be described below as an eighth embodiment of the present invention.

  FIG. 19 shows a configuration example of a radio base station in the eighth example of the present invention. The function of each part of the radio base station shown in FIG. 19 is the same as the part of the same name in the configuration example of the radio base station in the first embodiment of the present invention shown in FIG. FIG. 20 shows a processing procedure in the present embodiment. The procedure of this embodiment implements the handover process according to the same procedure as that of the first embodiment of the present invention shown in FIG. 13, except for the following points.

  That is, radio resource information is not exchanged between radio base stations in advance, and the destination radio base station determination unit 1960 of the radio base station AR-1 sends a detected radio base station notification message 2001 from the mobile terminal device MN. When received, the resource information of other radio base stations is collected by the radio resource information exchange procedure between radio base stations using the means shown in FIG. 6 (P401 in FIG. 20), and the destination candidate radio base station is determined. is there.

  In the eighth embodiment of the present invention shown in FIG. 20, the mobile terminal apparatus MN determines the start of handover, but the radio base station side receives a periodic report from the mobile terminal apparatus and determines the handover. Is also possible. FIG. 21 shows a procedure based on this method as a ninth embodiment of the present invention. If there is one destination radio base station selected in the destination radio base station candidate selection procedure executed by radio base station AR-1 in FIG. 21, destination candidate radio base station notification message 2102 The destination radio base station determination procedure 2114 and the destination radio base station request message 2103 can be omitted.

  In the first to ninth embodiments of the present invention described so far, a method of distributing the radio resource management function to the radio base stations is used. On the other hand, a method using an independent node that performs centralized management of radio resources is also conceivable. Hereinafter, a handover procedure based on a radio resource centralized management scheme will be described.

  FIG. 22 shows an example of the configuration of the entire radio communication system when the centralized management system for radio resources is used. The radio communication system shown in FIG. 22 includes a mobile terminal apparatus MN, radio base stations AR-11, AR-12, AR-13, and a radio resource management apparatus RRMS. The configuration of the mobile terminal device MN is the same as that shown in FIG.

  FIG. 23 shows a configuration example of the radio resource management apparatus RRMS of FIG. The radio resource management measure includes a transmission / reception unit 2310, a handover processing unit 2320, a base station resource information storage unit 2330, a destination base station determination unit 2340, and a radio resource management processing unit 2350. The transmission / reception unit 2310 is a device for performing data transmission / reception with respect to the wired network of FIG. The handover processing unit 2320 is used to perform handover processing based on MIP and FMIP received from the mobile terminal device MN and the radio base stations AR-11, AR-12, and AR-13.

  The base station resource information storage unit 2330 is used to store information on radio resources of the radio base stations AR-11, AR-12, and AR-13 connected to the wired network of FIG. The movement-destination base station determination unit 2340 uses the requested radio resource amount of the mobile terminal device notified from the mobile terminal device and the radio resource information of the radio base station stored in the radio base station resource information storage unit 2330. This is an apparatus for selecting a candidate for a radio base station that is a handover destination of a mobile terminal apparatus. The radio resource management processing unit 2350 performs processing according to messages related to securing, releasing, and exchanging information about radio resources received from mobile terminal devices and radio base stations.

  FIG. 24 shows a configuration example of the radio base station AR-11 configuring FIG. The radio base stations AR-12 and AR-13 have the same configuration. The radio base station AR-11 includes a first transmission / reception unit 2410, a second transmission / reception unit 2420, a handover processing unit 2430, and a radio channel management unit 2450. The first transmission / reception unit 2410 includes a reception state monitoring unit 2411 for monitoring the state of the wireless transmission path. The function of each part is the same as the part of the same name of the radio base station described as FIG.

  Next, FIG. 25 relates to the mobile terminal apparatus MN, the radio base stations AR-11, AR-12, AR-13, and the radio resource management apparatus RRMS when the radio resource management apparatus performs centralized management of radio resources. An overview of the handover procedure is shown. The handover process is roughly realized by the following five steps.

  (1) A radio resource information report procedure (procedure P701) for reporting radio resource information of each radio base station to the radio resource management apparatus.

  (2) A handover execution start procedure (procedure P-702) for determining execution of handover and performing preprocessing of handover execution.

  (3) A radio resource securing procedure (procedure P703) for securing a radio resource requested by connection-oriented communication in a radio base station that is a destination.

  (4) A handover destination notification procedure (procedure P704) for notifying a wireless base station to be a destination and a radio channel used for communication with the destination base station (procedure P704).

  (5) FMIP packet transfer procedure for executing packet transfer processing based on FMIP (procedure P705).

  FIG. 26 shows a first example of the detailed procedure of the processing procedure of the radio resource information report procedure shown as P701 in FIG. Hereinafter, this procedure will be described in detail with reference to FIGS. 7, 8, 23, 24, and 26.

  (Step 1) The radio resource management processing unit 2350 of the radio resource management device RRMS needs the resource information of the radio base station AR-12, for example, when there is no information in the base station resource information storage unit 2330 immediately after activation. Is determined, the radio resource information request message having the format shown in FIG. 7 is generated and transmitted to the radio base station AR-11 (message 2601 in FIG. 26).

  (Step 2) Upon receiving the radio resource information request message 2601, the radio channel management unit 2450 of the radio base station AR-11 includes information on radio resources managed by the reception state monitoring unit 2411 and the radio channel management unit 2450. However, a radio resource information report message in the format shown in FIG. 8 is generated and transmitted to the radio resource management apparatus RRMS (message 2602 in FIG. 26).

  (Step 3) Upon receiving the radio resource information report message 2602, the radio resource management processing unit 2350 of the radio resource management device RRMS stores the reported radio resource information in the radio base station resource information storage unit 2330 (FIG. 26). Procedure 2611).

  Further, the radio resource management device RRMS collects radio resource information by the same procedure for the radio base stations AR-12 and AR-13.

  Next, FIG. 27 shows a second example regarding the detailed procedure of the processing procedure of the radio resource information reporting procedure shown as procedure P701 in FIG. Hereinafter, this procedure will be described in detail with reference to FIGS. 8, 23, 24, and 27.

  (Step 1) The radio channel management unit 2450 of the radio base station AR-11 receives a radio resource information report message including information on the radio channels managed by the reception state monitoring unit 2411 and the radio channel management unit 2450 in the period TAR1-RRMS. (Messages 2701 and 2703 in FIG. 27) are repeatedly generated and transmitted to the radio resource management apparatus RRMS.

  (Step 2) Upon receiving the radio resource information notification messages 2701 and 2703, the radio resource management processing unit 2350 of the radio resource management device RRMS stores the reported radio resource information in the radio base station resource information storage unit 2330 (see FIG. 27 procedures 2711, 2714).

  The trigger for transmitting the radio resource information request message is not limited to periodic transmission. For example, as shown in the operation of the radio base station AR-12 in FIG. 27, there is a method of transmitting a radio resource information request message to the radio resource management apparatus RRMS in response to an internal radio resource allocation state change 2712 (FIG. 27). 27 messages 2702).

  The procedure of the tenth embodiment of the present invention will be described with reference to FIGS. 3, 8, 9, 23, 24, 28, 32, 33 and 34.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal apparatus MN receives beacon signals periodically transmitted by the radio base stations AR-11, AR-12, and AR-13, and compares the reception states (see FIG. 28 procedures 2811). Further, the radio resource management device RRMS transmits the peripheral radio base station information advertisement message of the format shown in FIG. 42 including the identifiers of radio base stations existing around the mobile terminal device MN and the radio base station information of each radio base station. Is periodically notified to the wireless terminal MN (message 2805 in FIG. 28).

  The specific content of the information notified as the radio base station information 4201 is the same as the radio resource information of the radio resource information report message shown in FIGS.

  (Step 2) The handover processing unit of the mobile terminal device MN detects that the reception state monitoring unit 311 has a radio base station whose reception state is sufficiently better than that of the radio base station AR-11, or On the other hand, when a command to execute handover is notified from the user of the wireless terminal MN, preparation for handover execution is started (procedure 2812 in FIG. 28).

  (Step 3) The movement destination radio base station determination unit 330 of the mobile terminal device MN determines the identifiers of the radio base stations AR-11, AR-12, and AR-13 detected by the transmission / reception unit 310 and the radio base stations. The detected radio base station notification message in the format shown in FIG. 32 including the communication quality information and the information on the resource amount required for the communication sessions 1 to 4 being executed on the mobile terminal device MN is sent to the radio resource management device RRMS. (Message 2801 in FIG. 28).

  (Step 4) Upon receiving the detected radio base station notification message 2801, the movement destination radio base station determination unit 2340 of the radio resource management device RRMS uses the movement destination radio base station determination unit 2340 as a radio base station to be a movement destination candidate. AR-11, AR-12, and AR-13 are selected (procedure 2813 in FIG. 28).

  As a determination criterion for the destination radio base station determination unit 2340 to select the destination candidate radio base station, information acquired by the detected radio base station notification message 2801 and the radio base station resource information storage unit 2330 are stored. The radio resource information of the radio base station, billing information when each radio base station is used, and information regarding access authority for each radio base station of the mobile terminal device MN can be considered.

  (Step 5) The destination radio base station determination unit 2340 of the radio resource management device RRMS includes the radio base station selected as the destination candidate and information on the communication quality in the format shown in FIG. A base station notification message is transmitted to the mobile terminal device MN (message 2802 in FIG. 28).

  (Step 6) The handover processing unit 320 of the mobile terminal device MN determines the radio base station AR-12 as the destination radio base station using the destination radio base station determination unit 330 (procedure 2814 in FIG. 28). The determination criteria for the destination radio base station determination unit 330 to determine the destination radio base station are information included in the destination candidate radio base station notification message 1302 and each radio base station detected by the reception state monitoring unit 311 There is a reception state from.

  (Step 7) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-12 and information on the resource amount required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination wireless base station request message in the format is transmitted to the wireless base station AR-11 (message 2803 in FIG. 28).

  (Step 8) The radio base station AR-11 requests the radio base station AR-12 to secure radio resources using the procedure shown in FIG. 5 (procedure P703 in FIG. 28). Further, the radio base station AR-12 reports to the radio resource management device RRMS that the radio resource state has changed (message 2804 in FIG. 28), and the radio resource management device RRMS updates the internal information (FIG. 28). 2815).

  (Step 9) Using the procedure shown in FIG. 6, the radio base station AR-11 notifies the mobile terminal device MN of information on the radio channel and IP address used for communication with the destination radio base station. (Procedure P704 in FIG. 12).

  Further, there may be a case where the mobile terminal device MN and the radio resource management device RRMS cannot communicate directly. In such a case, as shown in FIG. 31, there may be a method in which the mobile radio base station AR-11 relays communication between the mobile terminal device MN and the radio resource management device RRMS in this procedure. Further, in step 1, the radio base station RRMS does not necessarily need to transmit the neighboring radio base station information advertisement message.

  In the tenth embodiment of the present invention, when there is only one radio base station selected as the detection radio base station in step 3, steps 4 to 7 in the procedure of the tenth embodiment can be omitted. It is. The handover processing unit of the radio base station AR-11 that has received the handover execution request message executes the radio resource securing procedure P703 and the handover destination notification procedure to complete the handover process. This is shown in FIG. 29 as an eleventh embodiment of the present invention.

  23, FIG. 24, FIG. 30, FIG. 32, FIG. 33, FIG. 34, FIG.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal device MN receives beacon signals periodically transmitted from the radio base stations AR-11, AR-12, and AR-13, and measures the reception state (see FIG. 30 procedures 3011).

  (Step 2) The movement destination radio base station determination unit 330 of the mobile terminal device MN determines the identifiers of the radio base stations AR-11, AR-12, and AR-13 detected by the transmission / reception unit 310 and each radio base station. The detected radio base station notification message in the format shown in FIG. 32 including the communication quality information and information on the resource information required for the communication sessions 1 to 4 being executed on the mobile terminal device MN Is periodically transmitted (message 3001 in FIG. 30).

  (Step 3) The handover processing unit 2320 of the radio resource management apparatus RRMS acquires the radio base station resource information stored in the radio base station resource information storage unit 2330 and the detected radio base station notification message 3001. The execution state of the handover is determined using the reception state of the device MN (procedure 3012 in FIG. 30).

  (Step 4) The destination radio base station determination unit 2340 of the radio resource management device RRMS selects radio base stations AR-11, AR-12, and AR-13 as destination candidate radio base stations (procedure 3013 in FIG. 30). ).

  (Step 5) The radio resource management processing unit 2230 of the radio resource management device RRMS transmits the radio mobile terminal MN acquired from the detected radio base station notification message 3001 to all the movement destination candidate radio base stations selected in the step 4. The procedure for securing the requested radio resource is executed (procedure P703 in FIG. 30).

  (Step 6) The handover processing unit 2320 of the radio resource management device RRMS includes a destination of the format shown in FIG. 33 including information on the communication quality of the destination candidate radio base stations AR-11, AR-12, and AR-13. A candidate radio base station notification message is transmitted to the mobile terminal device MN (message 3002 in FIG. 30).

  (Step 7) The handover processing unit 320 of the mobile terminal device MN determines the radio base station AR-12 as the destination radio base station using the destination radio base station determination unit 330 (procedure 3014 in FIG. 30). The determination criteria for the destination radio base station determination unit 330 to determine the destination radio base station include information included in the destination candidate radio base station notification message 3002 and each radio base detected by the reception state monitoring unit 311. There is reception from the station.

    (Step 8) The handover processing unit 320 of the mobile terminal device MN includes an identifier of the movement-destination radio base station AR-12 and information regarding the resource amount required for the communication sessions 1 to 4 being executed, as shown in FIG. A destination radio base station request message in the format is transmitted to the radio resource management apparatus RRMS (message 3003 in FIG. 30).

  (Step 9) The handover processing unit 2320 of the radio resource management device RRMS gives the identifier of the destination radio base station AR-12 and the requested radio resource of the mobile terminal device MN to the AR-11 that is the source radio base station. A handover execution request message in the form shown in FIG. 38 including the amount is sent (message 3004 in FIG. 30). Furthermore, in order to release the radio resource reserved in step 5, a resource release request message of the format shown in FIG. 40 including the radio channel information to be released is transmitted to the radio base station AR-13 (FIG. 30). Message 3005).

  Upon receiving the resource release request message 3005, the radio channel management unit 2450 of the radio base station AR-13 releases the designated radio channel (procedure 3015 in FIG. 30).

  (Step 10) The handover processing unit of the radio base station AR-11 uses the procedure shown in FIG. 6 to the mobile terminal device MN and the radio channel used for communication with the destination radio base station AR-12. Information on the IP address is notified (procedure P704 in FIG. 30).

  In the first to twelfth embodiments described so far, the mobile terminal device MN detects all beacons supported by the mobile terminal device MN in order to detect without leaking the beacon signal transmitted by the radio base station. It is necessary to scan all frequencies and scramble codes.

  This is executed until the radio base station that does not reach the radio wave at the position of the mobile terminal device MN, so that the mobile terminal device MN has a useless processing time for searching for or monitoring the surrounding radio base stations. Consume and incur unnecessary power consumption.

  By notifying the mobile terminal device of information (radio frequency or scramble code) of the radio system to be scanned or monitored in advance, it becomes possible to suppress these unnecessary processing time and power consumption.

  FIG. 43 shows a configuration example of the entire wireless communication system in such a case. 43 includes a mobile terminal device MN, radio base stations AR-21, AR-22, AR-23, a radio transmission path, and a wired network. The configurations of the radio base stations AR-21, AR-22, and AR23 are the same as those shown in FIG. The configuration of the mobile terminal device MN is the same as that shown in FIG.

  The radio base stations AR-21, AR-22, and AR-23 periodically transmit beacon signals having different frequencies f1, f2, and f3, respectively. The mobile terminal device MN is connected to the radio base station AR-21 via a radio transmission path. In addition, the mobile terminal device MN can detect beacon signals from the radio base stations AR-21 and AR-22, but cannot detect a beacon signal from the radio base station AR-23. That is, the radio base stations AR-21 and AR-22 are adjacent to each other, but the radio base stations AR-21 and AR-23 are not adjacent to each other.

  The procedure of the thirteenth embodiment of the present invention will be described with reference to FIGS. 2, 3, 32, 33, 34, 39, 42 and 44. In the embodiment to be presented, a mobile terminal apparatus corresponding to two types of radio frequencies is cited, but this is not limited to two types, and can also be applied to cases where different radio communication systems are equipped.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal apparatus MN receives only the beacon signal of the frequency f1 periodically transmitted by the currently connected radio base station AR-21 and monitors the reception state (FIG. 44 procedures 4411, 4412). The beacon signal transmitted from the radio base station AR-22 transmitted at the frequency f2 is ignored.

  (Step 2) The destination radio base station determination unit 260 of the radio base station AR-21 moves the neighboring radio base station information exchange message of the format shown in FIG. 42, including the radio base station information of the adjacent radio base station. It is periodically transmitted to the terminal device MN (message 4401 in FIG. 44). The peripheral radio base station information exchange message stores the identifiers of the radio base stations AR-21 and AR-22 and the frequencies f1 and f2 of the beacon signals transmitted by the respective radio base stations.

  (Step 3) The reception state monitoring unit 311 of the mobile terminal device MN is set to receive the beacon signal of the frequency f2 transmitted by the radio base station AR-22 notified by the received neighboring radio base station information exchange message. Change (procedure 4413 in FIG. 44).

  (Step 4) Thereafter, the reception state monitoring unit 311 of the mobile terminal device MN performs the beacon signal of the frequency f1 periodically transmitted by the radio base station AR-21 and the frequency f2 periodically transmitted by the radio base station AR-22. Is monitored (procedures 4414, 4415, and 4416 in FIG. 44). Thereafter, for example, the handover process is completed by the same procedure as in the first embodiment of the present invention shown in FIG.

  As another wireless system configuration, there is also a configuration example shown in FIG. 45 includes a mobile terminal device MN, radio base stations AR-31, AR-32, AR-33, a radio resource management device RRMS, a radio transmission path, and a wired network. The configurations of the radio base stations AR-31, AR-32, and AR-33 are the same as those shown in FIG. The configuration of the mobile terminal device MN is the same as that shown in FIG. The configuration of the radio resource management device RRMS is the same as that shown in FIG. The radio base stations AR-31, AR-32, and AR-33 periodically transmit beacon signals of different frequencies f1, f2, and f3, respectively, as in the case of the radio communication system shown in FIG. The mobile terminal device MN is connected to the radio base station AR-31 via a radio transmission path.

  In addition, the mobile terminal device MN can detect beacon signals from the radio base stations AR-31 and AR-32, but cannot detect a beacon signal from the radio base station AR-33. That is, the radio base stations AR-31 and AR-32 are adjacent to each other, but the radio base stations AR-31 and AR-33 are not adjacent to each other.

  The procedure of the fourteenth embodiment of the present invention will be described with reference to FIGS. 3, 23, 24, 42 and 46. In the embodiment to be presented, a mobile terminal apparatus corresponding to two types of radio frequencies is cited, but this is not limited to two types, and can also be applied to cases where different radio communication systems are equipped.

  (Step 1) The reception state monitoring unit 311 of the mobile terminal device MN receives only the beacon signal of the frequency f1 periodically transmitted by the currently connected radio base station AR-31 and monitors the reception state (FIG. 46 procedures 4611, 4612). The beacon signal transmitted from the radio base station AR-32 transmitted at the frequency f2 is ignored.

  (Step 2) The destination radio base station determination unit 2340 of the radio resource management device RRMS transmits a peripheral radio base station information exchange message of the format shown in FIG. 42, including radio base station information of the adjacent radio base station, to the mobile terminal. It is periodically transmitted to the device MN (message 4601 in FIG. 46). The peripheral radio base station information exchange message stores the identifiers of the radio base stations AR-31 and AR-32 and the frequencies f1 and f2 of beacon signals transmitted by the respective radio base stations.

  (Step 3) The reception state monitoring unit 311 of the mobile terminal device MN is set to receive the beacon signal of the frequency f2 transmitted by the radio base station AR-32 notified by the received neighboring radio base station information exchange message. Change (procedure 4613 in FIG. 46).

  (Step 4) Thereafter, the reception state monitoring unit 311 of the mobile terminal device MN performs the beacon signal of the frequency f1 periodically transmitted by the radio base station AR-31 and the frequency f2 periodically transmitted by the radio base station AR-32. Is monitored (procedures 4614, 4615, and 4616 in FIG. 46). Thereafter, for example, the handover process is completed by a procedure similar to that of the eleventh embodiment of the present invention shown in FIG.

  Each operation in the base station, mobile terminal device, and radio resource management device described above is stored in advance in a recording medium such as a ROM as a program and read by a CPU that is a computer. Of course, it is configured to execute.

It is a figure which shows the block of the whole radio | wireless communications system in each of the 1st-9th Example of this invention. It is a figure which shows the structural example of the wireless base station in each of the 1st-7th Example of this invention. It is a figure which shows the structural example of the mobile terminal device in each of the 1st-11th Example of this invention. It is the figure which showed the outline | summary of the whole handover procedure in each of the first to seventh embodiments of the present invention. It is the figure which showed the 1st form of the detailed procedure about the resource information exchange procedure of FIG. It is the figure which showed the 2nd form of the detailed procedure about the resource information exchange procedure of FIG. It is the figure which showed the packet format of the radio | wireless resource information request message in this invention. It is the figure which showed the packet format of the radio | wireless resource information report message in this invention. It is the figure which showed the detailed content of the radio | wireless resource information contained in the packet of the radio | wireless resource information report message in this invention. It is the figure which showed the detailed procedure about the radio | wireless resource securing procedure in each 1st-9th Example of this invention. It is the figure which showed the detailed procedure about the handover destination notification procedure in each of the first to ninth embodiments of the present invention. It is the figure which showed the detailed procedure about the handover procedure in 1st Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 2nd Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 3rd Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 4th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 5th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 6th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 7th Example of this invention. It is the figure which showed the structural example of the wireless base station in each of the 8th, 9th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 8th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 9th Example of this invention. It is a figure which shows the block structural example of the whole radio | wireless communications system in each 10th, 11th Example of this invention. It is a figure which shows the structural example of the radio | wireless resource management apparatus in each 10th, 11th Example of this invention. It is a figure which shows the structural example of the wireless base station in each of the 10th and 11th Examples of this invention. It is the figure which showed the outline | summary of the whole handover procedure in each 10th, 11th Example of this invention. It is the figure which showed the 1st form of the detailed procedure of the radio | wireless resource information reporting procedure in each 10th, 11th Example of this invention. It is the figure which showed the 2nd form of the detailed procedure of the radio | wireless resource information report procedure in each 10th, 11th Example of this invention. It is the figure which showed the detailed procedure in case the mobile terminal device MN determines a handover about the handover procedure in the 10th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 11th Example of this invention. It is the figure which showed the detailed procedure about the handover procedure in the 12th Example of this invention. It is the figure which showed the procedure in case the mobile terminal device MN and radio | wireless resource management apparatus RRMS cannot communicate directly about the handover procedure in the 10th Example of this invention. It is the figure which showed the packet format of the detection radio base station notification message in this invention. It is the figure which showed the packet format of the movement destination candidate radio base station notification message in this invention. It is the figure which showed the packet format of the movement destination radio base station request message in this invention. It is the figure which showed the packet format of the movement destination radio base station advertisement message in this invention. It is the figure which showed the packet format of the resource securing request message in this invention. It is the figure which showed the packet format of the resource securing response message in this invention. It is the figure which showed the packet format of the handover execution request message in this invention. It is the figure which showed in detail the specific item contained in the field of the radio | wireless resource amount which the communication session on the mobile terminal device of FIG.32, FIG.34-38 requires. It is the figure which showed the packet format of the resource release request message in this invention. It is the figure which showed the detailed procedure about the FMIP packet transfer procedure in each of the first to fourth embodiments of the present invention. It is the figure which showed the packet format of the periphery radio base station information advertisement message in this invention It is a figure which shows the block structural example of the whole radio | wireless communications system in 13th Example of this invention. It is the figure which showed the detailed procedure of the handover procedure in the 13th Example of this invention. It is a figure which shows the block structural example of the whole radio | wireless communications system in 14th Example of this invention. It is the figure which showed the detailed procedure of the handover procedure in the 14th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Mobile terminal device 121-123 Wireless base station 131, 132 Wireless transmission path 140 Wired network 210, 1910, 2410 First transmission / reception part 211, 1911, 2411 of wireless base station Reception state of first transmission / reception part of wireless base station Monitoring unit 220, 1920, 2420 Second transmission / reception unit of radio base station 230, 1930, 2430 Handover processing unit of radio base station 240 Radio base station resource information storage unit of radio base station 250, 1950, 2450 Radio of radio base station Channel management unit 260, 1960 Radio base station destination radio base station determination unit 310 Mobile terminal device transmission / reception unit 311 Mobile terminal device transmission / reception unit reception state monitoring unit 320 Mobile terminal device handover processing unit 330 Mobile terminal device movement Destination radio base station determination unit 340 Radio channel management of mobile terminal apparatus Part

Claims (13)

  A radio comprising a plurality of radio base stations and a mobile terminal device that performs packet communication connected to the first radio base stations included in the plurality of radio base stations via a radio link and delivered to a unique destination by a network layer protocol A radio base station in a mobile communication system, wherein the first radio base station is used by a radio base station that is adjacent to the first radio base station in a cell range among the plurality of radio base stations. A radio base station that periodically broadcasts information related to a radio type as adjacent radio base station system information.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces that perform packet communication that is connected to a first radio base station included in the plurality of radio base stations via a radio link and is delivered to a unique destination by a network layer protocol A mobile terminal apparatus in a wireless mobile communication system comprising a mobile terminal apparatus, wherein the mobile terminal apparatus is information related to a radio type used by a radio base station adjacent to the first radio base station in a cell range. As a neighboring radio base station system information, and a radio base station indicated by the neighboring radio base station system information is set as a search target as a candidate for a destination radio base station.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces that perform packet communication that is connected to a first radio base station included in the plurality of radio base stations via a radio link and is delivered to a unique destination by a network layer protocol A mobile communication method in a radio mobile communication system comprising a mobile terminal device, wherein the radio mobile terminal device changes a radio base station to which the radio mobile terminal device is connected to a second radio base station included in the plurality of radio base stations In order to realize handover that is to be performed, the first radio base station is used by a radio base station that is adjacent to the first radio base station in a cell range among the plurality of radio base stations. Information on the radio type is periodically reported as adjacent radio base station system information, and the mobile terminal apparatus normally performs communication with only one radio system enabled. When the neighboring radio base station system information transmitted from the first radio base station is received, the different radio system neighboring radio base stations using different radio systems are determined according to the received neighboring radio base station system information. A wireless mobile communication method characterized in that when a presence is detected, a wireless system used by the wireless base station adjacent to the heterogeneous wireless system is also enabled to search for a movement destination candidate wireless base station.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces connected to a first radio base station included in the plurality of radio base stations via a radio link and performing packet communication delivered to a unique destination by a network layer protocol A mobile communication method in a wireless mobile communication system including a mobile terminal device that performs communication between the wireless mobile terminal device and a second wireless base station included in the plurality of wireless base stations. In order to realize a handover that is to be changed, the radio resource management apparatus is notified of the radio interface to be installed, information on its own current position, or a combination of the type of radio interface to be equipped and information on its current position The first radio base station is connected to the first radio base station among the plurality of radio base stations. Information related to radio types used by adjacent radio base stations in the range is transmitted as adjacent radio base station system information to the mobile terminal apparatus, and the mobile terminal apparatus normally enables only one radio system. When the neighboring radio base station system information transmitted from the first radio base station is received and the adjacent radio base station system information transmitted from the first radio base station is received, the different radio system neighboring radios using different radio systems according to the received neighboring radio base station system information A wireless mobile communication method characterized by detecting a movement destination candidate radio base station by enabling a radio system used by a radio base station adjacent to the heterogeneous radio system when it detects that a base station exists.   A radio having a plurality of radio base stations, a mobile terminal connected to a first radio base station included in the plurality of radio base stations via a radio link, and a function of managing radio resources of the plurality of radio base stations A radio resource management apparatus in a radio mobile communication system comprising a resource management apparatus, wherein the plurality of radio base stations, the mobile terminal apparatus, and the radio resource management apparatus have a function of performing packet communication delivered to a unique destination by a network layer protocol The radio resource management device transmits information on a radio type used by a radio base station adjacent to the first radio base station in a cell range among the plurality of radio base stations. A radio resource management apparatus characterized by periodically informing system information.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces connected to a first radio base station included in the plurality of radio base stations via a radio link and performing packet communication delivered to a unique destination by a network layer protocol And a radio resource management device having a function of managing radio resources of the plurality of radio base stations, the plurality of radio base stations, the mobile terminal device, and the radio resource management device according to a network layer protocol A mobile communication method in a radio mobile communication system having a function of performing packet communication delivered to a unique destination, wherein the radio mobile terminal device includes radio base stations to which the radio mobile terminal apparatus is connected included in the plurality of radio base stations. In order to realize a handover which is a change to a different radio base station, the radio resource management device Periodically reports information on a radio type used by a radio base station that is adjacent to the first radio base station as neighboring radio base station system information. When communication is performed with only one radio system enabled and the neighboring radio base station system information transmitted from the radio resource management apparatus is received, a different radio system is used depending on the received neighboring radio base station system information. And detecting a destination candidate radio base station by enabling the radio system used by the heterogeneous radio system adjacent radio base station when it detects that there is a different radio system adjacent radio base station. Wireless mobile communication method.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces connected to a first radio base station included in the plurality of radio base stations via a radio link and performing packet communication delivered to a unique destination by a network layer protocol And a radio resource management device having a function of managing radio resources of the plurality of radio base stations, the plurality of radio base stations, the mobile terminal device, and the radio resource management device according to a network layer protocol A mobile communication method in a radio mobile communication system having a function of performing packet communication delivered to a unique destination, wherein the radio mobile terminal device includes radio base stations to which the radio mobile terminal apparatus is connected included in the plurality of radio base stations. In order to implement handover, which is a change to another radio base station, the equipped radio interface Or the information on the current location of the device or a combination of the type of the wireless interface to be equipped and the information on the current location of the device, the wireless resource management device notifies the first wireless base station. Information related to the type of radio used by a radio base station that is adjacent to the station is transmitted as adjacent radio base station system information to the mobile terminal device, and the mobile terminal device normally enables only one radio system. When the neighboring radio base station system information transmitted from the radio resource management apparatus is received, the different radio system neighboring radios using different radio systems according to the received neighboring radio base station system information. When the presence of a base station is detected, the wireless base station adjacent to the heterogeneous wireless system System Enabling wireless mobile communication method characterized by searching for a destination candidate radio base station.   The radio base station according to claim 1, wherein the content notified as the radio system information is at least one of a radio communication scheme, a radio frequency, and a scramble code.   3. The mobile terminal apparatus according to claim 2, wherein the content notified as the radio system information is at least one of a radio communication system, a radio frequency, and a scramble code.   6. The radio resource management apparatus according to claim 5, wherein the content notified as the radio system information is at least one of a radio communication scheme, a radio frequency, and a scramble code.   8. The wireless mobile communication method according to claim 3, wherein the content notified as the wireless system information is at least one of a wireless communication system, a wireless frequency, and a scramble code. A wireless mobile communication method.   A radio comprising a plurality of radio base stations and a mobile terminal device that performs packet communication connected to the first radio base stations included in the plurality of radio base stations via a radio link and delivered to a unique destination by a network layer protocol A program for causing a computer to execute an operation of the first radio base station in a mobile communication system, which is used by a radio base station adjacent to the own station in a cell range among the plurality of radio base stations A computer-readable program characterized by including a process of periodically informing information related to a radio type as adjacent radio base station system information.   Equipped with a plurality of radio base stations and a plurality of types of radio interfaces that perform packet communication that is connected to a first radio base station included in the plurality of radio base stations via a radio link and is delivered to a unique destination by a network layer protocol A program for causing a computer to execute an operation of a mobile terminal device in a wireless mobile communication system including the mobile terminal device, which is used by a radio base station adjacent to the first radio base station in a cell range Receiving information related to a radio type as neighboring radio base station system information, and including a process of searching for a radio base station designated by the neighboring radio base station system information as a candidate for a destination radio base station A computer readable program.

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