WO2004057903A1 - モバイルノード - Google Patents
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- WO2004057903A1 WO2004057903A1 PCT/JP2002/013331 JP0213331W WO2004057903A1 WO 2004057903 A1 WO2004057903 A1 WO 2004057903A1 JP 0213331 W JP0213331 W JP 0213331W WO 2004057903 A1 WO2004057903 A1 WO 2004057903A1
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- network
- handover
- quality
- control unit
- radio wave
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- 238000004891 communication Methods 0.000 claims abstract description 77
- 238000012545 processing Methods 0.000 claims abstract description 39
- 230000004044 response Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 63
- 230000008569 process Effects 0.000 claims description 43
- 238000011084 recovery Methods 0.000 claims description 26
- 230000008859 change Effects 0.000 claims description 22
- 230000007423 decrease Effects 0.000 claims description 17
- 230000006866 deterioration Effects 0.000 claims description 14
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims 7
- 238000006731 degradation reaction Methods 0.000 claims 7
- 238000010586 diagram Methods 0.000 description 20
- 230000005540 biological transmission Effects 0.000 description 14
- 238000005259 measurement Methods 0.000 description 6
- 238000001994 activation Methods 0.000 description 5
- 238000012508 change request Methods 0.000 description 5
- 230000004913 activation Effects 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 102220586114 Tubulin polymerization-promoting protein_S32E_mutation Human genes 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/02—Capturing of monitoring data
- H04L43/022—Capturing of monitoring data by sampling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
Definitions
- the present invention relates to a mobile node, and more particularly, to a mobile node that performs communication on a mobile IP (Internet Protocol) network.
- a mobile IP Internet Protocol
- handover is a key technology for dissemination of Mopil IP.
- Handover is a technology that automatically switches the network connection destination so that the mobile node can continue communication even if it moves to another network while communicating on the current network.
- a person listening to music on a PDA (Personal Digital Assistant) with a wireless LAN (Local Area Network) function can use a nearby boutique with another wireless LAN base station.
- PDA Personal Digital Assistant
- wireless LAN Local Area Network
- the handover unit If all PDAs and wireless LANs support Mopile IP), the handover unit If it does, users will still be able to listen to streaming music, even if they move to another network.
- Such handover control needs to be performed instantaneously so that the user does not know it, but it is very important for data communication, rather than voice information only communication.
- the network switching is performed by automatically selecting a preset user policy and the network that can be used at that time.
- the handover process is performed after detecting the disconnection of the connected network, so that the switching of the network connection after the disconnection is completed after the disconnection is completed.
- communication is interrupted (interrupted)
- packet loss occurs.
- the mobile node even after network switching, if the accompanying registration of the mopile IP is not completed on the network side, communication cannot be started normally on the new destination network. Therefore, it is necessary for the mobile node to allow reception of the bucket via the old network before the movement for a predetermined time even after the handover process.
- the wireless network may be disconnected as soon as the connection is established (for example, when near the boundary of the radio wave reception area). Therefore, in order to prevent the network connection from flapping, it is also important to execute the handover process after the network to be switched to has been stabilized. Disclosure of the invention
- the present invention has been made in view of such a point, and an object of the present invention is to provide a mopile node that performs high-quality handover processing in order to eliminate communication interruption time and maintain good communication continuity. I do.
- a network device 11 having an interface function for connecting to a network in a mopile node 10 performing communication on a mopile IP network.
- a network quality monitoring unit 12 that monitors the network quality based on at least one of the radio wave intensity and / or the wireless band received by the network device 11 1 _ 1 to 11.
- the network devices 111 to 111-n have an interface function for connecting to a network.
- the network quality monitoring unit 12 monitors the network quality based on at least one of the radio wave intensity or the radio band received by the network devices 11_1 to 11n.
- the handover control unit 13 sends a care-of address to an address registration destination according to the state of the network quality before the communication is cut off, changes the route of communication information, and connects to a new network. Handover to switch the.
- the network control unit 14 receives a response indicating that the care-of address has been updated at the address registration destination, and maintains the function of receiving the network before switching until the communication is disconnected.
- FIG. 1 is a diagram showing the principle of a mopile node according to the present invention.
- FIG. 2 is a sequence diagram showing the operation of the mopile node.
- FIG. 3 is a diagram showing a configuration of a mopile node.
- FIG. 4 is a diagram illustrating a handover due to a decrease in network quality.
- FIG. 5 is a diagram illustrating a handover due to network quality restoration.
- FIG. 6 is a flowchart showing the operation of the network quality monitoring unit.
- FIG. 7 is a diagram illustrating an operation concept of the radio wave intensity monitoring unit.
- FIG. 8 is a flowchart showing the operation of the radio wave intensity monitoring unit.
- FIG. 9 is a diagram illustrating an operation concept of the radio wave intensity monitoring unit using the rapid deterioration threshold.
- FIG. 10 is a flowchart showing the operation of the wireless band monitoring unit.
- FIG. 11 is a diagram showing a quality management table.
- FIG. 12 is a flowchart showing the operation of the network state management unit.
- FIG. 13 is a flowchart showing the operation of the network switching control unit.
- FIG. 14 is a flowchart illustrating the operation of the network switching control unit.
- FIG. 15 is a diagram showing a router information list for route control.
- FIG. 16 is a flowchart showing the operation of the network control unit.
- FIG. 17 is a flowchart showing the operation of the interface processing unit.
- FIG. 18 is a flowchart showing the operation of the link processing unit.
- FIG. 19 is a diagram for explaining a handover of access point switching. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram illustrating the principle of a mobile node according to the present invention.
- the mopile node 10 is a terminal device that performs communication on the mopile IP network, and corresponds to a notebook computer, a PDA, a mobile phone, and the like.
- the function of the present invention is applicable to both Mopile IP v4 and Mopile IP v6. Is also applicable.
- Each of the network devices 111 to 111 has an interface function for connecting to a network, and corresponds to, for example, a NIC (network 'interface' card).
- the mobile node 10 is equipped with multiple network devices that connect to a network such as a wireless LAN and a third-generation mobile phone network such as FOMA (registered trademark, omitted hereafter), and one terminal connects to multiple networks. be able to.
- a network such as a wireless LAN and a third-generation mobile phone network such as FOMA (registered trademark, omitted hereafter)
- FOMA registered trademark, omitted hereafter
- the network quality monitoring unit 12 monitors the network quality based on at least one of the radio wave intensity and the radio band received by the network devices 11-1 to 11-n.
- the handover control unit 13 transmits a care-of address (CoA) to an address registration destination (such as a home agent) before the communication is disconnected, according to the state of the network quality, and performs communication. Change the route of information (IP packets) and perform a handover to switch the connection destination to a new network. Switching of the network connection is performed by switching from the currently communicating Mopile IP network to a new Mopile IP network.
- CoA care-of address
- care-of address is an IP address that the mobile node 10 uses temporarily in the destination network.
- a home agent is a node that exists in the home network of the mobile node 10 and distributes information addressed to the mobile node 10 and recognizes the location of the mobile node 10.
- the handover control unit 13 stores a user priority (priority of network connection) that can be set by the user, and changes the priority according to a change in network quality. Try handover to a higher network. Alternatively, handover is performed based on a network quality index, which will be described later, managed by the network quality monitoring unit 12.
- the network control unit 14 receives a response indicating that the care-of address has been updated at the address registration destination, and performs a packet reception function with the network before the switching until the communication with the network before the switching is disconnected. maintain.
- the present invention recognizes that the network quality of the network N1 has deteriorated, and performs a handover process. (That is, if the network quality is degraded before the network is disconnected, the handover is performed.)
- the communication with the network N2 is continued. At this time, packets transmitted from the network N1 are received until the communication with the network N1 before the switching is disconnected. This enables handover without packet loss (no interruption in communication).
- FIG. 2 is a sequence diagram showing the operation of the mobile node 10.
- the mopail node 10 communicates via the wireless LAN, moves to the mobile phone network (such as FOMA), and then communicates via the mobile phone network.
- the mobile phone network such as FOMA
- the mobile node 10 detects an event indicating a decrease in network quality with the currently communicating wireless LAN, and starts the handover process.
- the mobile node 10 sends R S (Router Solicitation) to the access router (A R) via the mobile phone network.
- RS is a request to acquire prefix information (in the case of IPv6, the network identifier of the upper 64 bits of a 128-bit long IPv6 address).
- prefix information in the case of IPv6, the network identifier of the upper 64 bits of a 128-bit long IPv6 address.
- the mobile node 10 sends a BU (Binding Update: care-of address registration request) to the HA via the mobile phone network.
- BU Biting Update: care-of address registration request
- BA Blocking Acknowledgement: response to registration of the care-of address
- the mobile node 10 continues the communication performed by the wireless LAN through the mobile phone network, the AR, and the HA.
- FIG. 3 is a diagram showing a configuration of the mobile node 10.
- the thick solid arrow indicates data
- the thin solid arrow indicates a control signal.
- the mobile node 10 is a network device 11, a network quality monitoring unit 12, a mopile IP control unit (corresponding to the handover control unit of the present invention) 13, a network control unit 14, an application 15, a packet input. It has a unit 16 and a bucket output unit 17.
- the application 15 is a higher-level application, and is software that performs communication with another node and provides a service to a user.
- the application 15 includes an application for stopping (down) processing of a communication interface of the network device 11 and performing a link disconnection processing such as a dial-up telephone connection, and performs network control according to a user instruction.
- the mopile IP control unit 13 includes a network state management unit 13a, a network switching control unit 13b, a handover execution unit 13c, and a terminal management unit 13d. Management ⁇ Perform handover control.
- the network status management unit 13a Upon receiving the network quality change event from the network quality monitoring unit 12, the network status management unit 13a notifies the network switching control unit 13b of a network switching request according to the quality status.
- the network switching control unit 13b executes a handover in response to a change in network quality (for example, a decrease in radio field intensity, a restoration of insufficient radio band, a restoration of a wireless band, a disconnection of a network connection, and a Z establishment in response to a network switching request).
- a handover request is output to section 13c, and an instruction for network switching is sent to network control. Output to control section 14.
- the handover execution unit 13c executes a mopile IP handover based on the handover request.
- the terminal management unit 13 d manages the mobile node information, and controls the communication of the mobile node 10 and outputs a network switching request to the network switching control unit 13 b as necessary. Also, it transmits a bucket data output request to the bucket output unit 17.
- the packet input unit 16 performs input processing of packet data received via the network device 11.
- the packet output unit 17 transmits packet data to the corresponding network via the network device 11 in response to the packet data output request.
- the network control unit 14 includes a packet transmission / reception control unit 14a, an interface processing unit 14b, and a link control unit 14c, and performs management of the network device 11 and overall management of bucket transmission / reception.
- the packet transmission / reception control unit 14a controls transmission / reception of packets and performs transmission / reception with the new network after the switching while maintaining the packet reception function with the old network before the switching at the time of network switching. .
- the interface processing unit 14 b performs state management control of the packet input / output interface of the network device 11. Further, when performing interface down processing in response to a request from the application 15, if the communication interface of the target network device is currently connected, the network switching request is sent to the network switching control unit 13b. Perform the handover, and then perform the down process (after the completion of network switching). When the interface of the network device comes up (starts up), it notifies the network switching control unit 13b that the corresponding network device has become effective.
- the link control unit 14c performs link state management control of a network with which the network device 11 communicates. If the target link is currently connected at the start of the link disconnection process according to the instruction of the application 15, a network switching request is made to the network switching control unit 13 b and a handover is performed. After that (after the completion of network switching), the link is disconnected. Further, When the link of the network device is up (connection established), the network switching control unit 13b is notified that the network connection has been established.
- the network device 11 controls the interface connection with the network and manages the connection state according to the network type.
- network types include network devices (NICs) such as wireless LAN 11-1-1, FOMA 11-2, Bluetooth 11-3, and PDC (Personal Digital Cellular) 11-4. (Note that not only devices with a wireless interface but also devices with a wired interface may be provided).
- the network quality monitoring unit 12 includes a radio field intensity monitoring unit 12a and a wireless band monitoring unit 12b.
- the radio wave intensity monitoring unit 12a monitors the radio wave intensity of the various network devices 11 at a fixed or variable set cycle or upon reception of a packet (monitoring triggered by cycle monitoring and bucket reception).
- a network quality change event is transmitted to the network state management unit 13a.
- the wireless band monitoring unit 12b monitors the state of the wireless band of the various network devices 11 at a fixed or variably set cycle or upon reception of a bucket (period monitoring and monitoring based on packet reception). May be used).
- a network quality change event is transmitted to the network state management unit 13a.
- FIG. 4 is a diagram illustrating a handover due to a deterioration in network quality.
- the network system configuration (the system shown in the figure is an example) is explained.
- HA 20 Correspondent's node (CN: Correspondent Node) 104, AR (access router) 31, 41 are connected to the IP network 101.
- An AR 31 and an access point (AP) 32 are connected to the wireless LAN 102, and an AR 41 and a wireless base station (BS) are connected to the mobile phone network (FOMA, etc.) 103.
- Base Station 4 2 connects.
- the mobile node 10 is connected between heterogeneous networks from the wireless LAN 102 to the mobile phone network 103. A handover shall be performed.
- the mobile node 10 communicates with the CN 104 via the IP network 101, the AR31, the wireless LAN 102, and the AP 32 using the network device 11-1 (NIC for wireless LAN). A packet is transmitted from 104 to the mobile node 10.
- NIC network device 11-1
- the mopile node 10 detects the deterioration of the network quality before disconnecting the network connection currently in communication, and the main interface Is changed to the network device 11-2 (NIC for mobile phone network), and the RS is transmitted from the NIC 11-2 to the AR 41 on the mobile phone network 103 with which communication is possible.
- the mobile node 10 Upon receiving the RA, the mobile node 10 generates a care-of address to be used in the mobile phone network 103, and selects the AR41 as a default router. Then, transmission of upstream packets from the route using NIC 11-1 is suppressed. After that, BU is sent to HA20 (care-of address is sent).
- the default router means that it is impossible to set in advance all routers, for example, routes to all hosts / networks on the Internet. Route).
- the HA 20 Upon receiving the BU from the mobile node 10, the HA 20 updates the database corresponding to the home address and the care-of address of the mobile node 10 (that is, updates the care-of address), and returns BA as a response. .
- the mopile node 10 also transmits a BU to the CN 104 that was communicating.
- the CN 104 transmits the packet to the mobile node 10 through the new routes, that is, the IP network 101, the A41, the mobile phone network 103, and the BS42.
- the NIC 11-1 maintains the connection state with the wireless LAN 102, so that the bucket reception is continued. Therefore, the CN 104 sends the packet to the mobile node 10 before receiving the BU. Even if a packet is transmitted via the wireless LAN 102, the packet can be received using the NIC 11-1. Therefore, handover can be performed without causing packet loss.
- FIG. 5 illustrates a handover due to network quality restoration. It is assumed that the network quality of the wireless LAN 102 has been restored when the mobile node 10 is communicating with the CN 104 via the mobile phone network 103 in the handover described above with reference to FIG.
- the mobile node 10 uses the NIC 11-2 to communicate with the CN 104 via the IP network 101, the AR41, the mobile phone network 103, and the BS 42, and a packet is transmitted from the CN 104 to the mobile node 10. Sent to.
- CS 223 NIC 11 When the network quality in one direction (wireless LAN 102) is restored, the mopile node 10 detects that, and changes the main interface from NIC 11-12 to NIC 11—1 and changes the wireless LAN 102 Send RS to AR 31 above.
- the mobile node 10 Upon receiving the RA, the mobile node 10 generates a care-of address to be used in the wireless LAN 102, and sets the route in the NIC 11-1 direction selected as the main interface as the default route. It also suppresses uplink bucket transmission from the route using NIC 11-2. After that, the BU notifies the HA 20 of the newly created care-of address.
- the HA 20 Upon receiving the BU, the HA 20 updates the database corresponding to the home address of the mobile node 10 and the care-of address, and returns BA as a response.
- CS 263 mobile node 10 also sends a BU to CN104 that was communicating. You.
- the CN 104 transmits the packet to the mobile node 10 through the new routes, the IP network 101, the AR 31, the wireless LAN 102, and the AP 32.
- the packet reception is continued, so that the NIC 104 receives the BU before the CN 104 receives the BU. Even when a packet is transmitted to the mobile node 10 via the mobile phone network 103, the packet can be received using the NIC 11-2. Therefore, handover can be performed without causing packet loss.
- the handover accompanying the restoration of the network quality here is based on the assumption that the priority of the network in the wireless LAN 102 is higher than that of the mobile phone network 103 and that the mobile phone network 103 Network was switched to wireless LAN 102, but in the case where the mobile phone network 103 and wireless LAN 102 have almost the same priority, the mobile phone network 103 If the network quality does not deteriorate, it is not always necessary to perform a handover to restore the network quality.
- the handover described above is for handover between a wireless LAN and a mobile phone network.
- a network to be switched due to a decrease in the radio signal strength of the wireless LAN is, for example, a wired network such as Ethernet (registered trademark). Network.
- the case of measuring the signal strength and the wireless band as the network quality has been shown.
- the establishment of the network connection triggers the detection of this network connection, and the connection to the wired network is detected. Handover processing can also be performed.
- the network quality monitoring unit 12 has a timer for quality monitoring, and the monitoring cycle can be rewritten from the application. In addition, quality monitoring is started at each cycle set in the timer. In addition, the network quality monitoring function is called when the network device for quality measurement receives a bucket, other than in the evening. A timer handler that operates when the timer expires activates this function for periodical monitoring, and a hardware interrupt handler activates monitoring when a bucket is received. In order to identify which process has been activated, the method by which the activation source handler sets an ID for identifying itself as a parameter at the time of activation of the network quality monitoring unit 12 is used.
- the monitoring process is not executed as described above.
- the timer for preventing excessive monitoring is checked, and then the signal strength monitoring unit 12a and radio band for all installed network devices 111-1-1-n are checked.
- the network quality is measured using the monitoring unit 12b.
- FIG. 6 is a flowchart showing the operation of the network quality monitoring unit 12.
- step S3 13 It is determined whether or not the timer for excess prevention has expired. If the timer has expired (the time has expired), the process proceeds to step S32; otherwise, it ends. If the time is counted, the network quality is not measured.
- step S 3 2 Perform the corresponding processing from step S 32 a to step S 32 e for all implemented network devices 11-1 to 11-n for which network quality is to be measured.
- step S32a It is determined whether the device status is connection (whether the network device 11 is connected to the device). If it is connected, go to step S32b. If it is disconnected, go to step S33.
- step S32b It is determined whether or not the network status is connection (whether or not the network device 11 is currently communicating). If connection, go to step S32E. If disconnect, go to step S33.
- step S32d If the signal strength is normal, go to step S32e. If it is low, go to step S33.
- [S32e] Activate the processing of the wireless band monitoring unit 12b.
- [S33] It is determined whether there is a timeout call. If there is a call, the process returns to the start after the time set in the monitoring timer value. If not, the process proceeds to step S34 because the network quality measurement is started by receiving a bucket.
- FIG. 7 is a diagram showing an operation concept of the radio wave intensity monitoring unit 12a.
- the vertical axis is radio wave intensity
- the horizontal axis is time, showing the waveform of the received radio wave.
- the radio wave intensity monitoring unit 12a has two thresholds for judging whether the radio wave state is reduced or restored. One is a drop threshold (out-of-service threshold) for determining that the signal strength has decreased, and the other is a restoration threshold (service area threshold) for determining that the signal strength has been restored.
- the setting of these thresholds can be arbitrarily changed by operating the application 15.
- the measurement of the radio wave intensity shows that the measurement is performed in units of 200 ms.
- the radio wave intensity monitoring unit 12a reads out the radio wave intensity of the wireless channel under communication.
- To read the radio wave intensity for example, there is a method of inquiring about the radio wave condition using an interface with a wireless LAN card.
- a decrease in the radio wave intensity is detected when the read radio wave intensity is lower than the lowering threshold, in which case a handover is performed.
- handover is not performed in the case where the level falls below the threshold in a short time even if the level falls below the threshold, such as level L1. This is because if handover is performed in a state where the radio wave condition fluctuates near the drop threshold, the network switching will flutter, and stable connection control cannot be performed.
- handover is performed only after recognizing that the network quality is lowering.
- the handover is performed at the level L2 that is lower than the lowering threshold for about 600 ms.
- the signal strength monitoring unit 12a When detecting a drop in the signal strength, the signal strength monitoring unit 12a notifies the network state management unit 13a of the drop in the signal strength and sets its own signal state to reduced. No other quality monitoring (wireless band) will be performed because the signal strength has dropped. After that, if this function is started due to timeout, set the timer for the next start.
- the signal strength recovery is detected when the signal strength read out after the signal strength reduction is greater than the restoration threshold, and in that case, the handover is executed.
- level L3 handover is not performed in the case where the value falls below the recovery threshold in a short time even if the value exceeds the recovery threshold. This is because, for the same reason as described above, if handover is performed in a state where the radio wave condition fluctuates near the recovery threshold, network switching will flutter, and stable connection control will not be possible.
- the handover when the quality of the received radio wave exceeds the restoration threshold value, for example, for a certain period of time, for example, the handover is not recognized until it is recognized that the network quality has been restored.
- the signal strength monitoring unit 12a When the signal strength is restored, the signal strength monitoring unit 12a notifies the network state management unit 13a of the signal strength restoration, sets its own signal strength state to normal, and then sets the wireless band Monitoring will be performed. Furthermore, if a statistical method such as a moving average is used in combination with the value of the radio wave intensity, the influence of the temporary strength of the radio wave intensity can be further reduced.
- FIG. 8 is a flowchart showing the operation of the radio wave intensity monitoring unit 12a.
- CS 4 3 For example, determine whether or not the radio wave intensity is lower than the lowering threshold for a certain period of time continuously. If it falls below, the process proceeds to step S44. Otherwise, the process ends. [S44] Notify the network state management unit 13a of the decrease in radio wave intensity.
- the radio wave strength state is set to be low.
- FIG. 9 is a diagram showing an operation concept of the radio wave intensity monitoring unit 12a using the rapid deterioration threshold.
- the vertical axis is radio wave intensity
- the horizontal axis is time.
- the radio wave intensity monitoring unit 12a has a rapid deterioration threshold value lower than the decrease threshold value.
- the handover is started immediately. For example, in the case of the figure, the handover is performed at a level L5 exceeding the rapid deterioration threshold twice consecutively in a unit of 200 ms.
- the rapid interruption threshold value is set and the handover is performed instantaneously, thereby minimizing the communication interruption time.
- the wireless band monitoring unit 12b detects the shortage of the wireless band (the number of users using a certain wireless band increases) and recovery using two thresholds, similarly to the radio wave intensity monitoring unit 12a. In other words, it has an insufficiency threshold as a threshold for judging bandwidth shortage and a recovery threshold as a threshold for bandwidth restoration judgment.
- FIG. 10 is a flowchart showing the operation of the wireless band monitoring unit 12b.
- step S52 The state of the wireless band is determined. If normal, go to step S53; if insufficient, go to step S56.
- step S53 it is determined whether or not the wireless band is below the shortage threshold continuously for a certain period of time, for example. If it falls below, the process proceeds to step S54. Otherwise, the process ends.
- the wireless band is set to be insufficient for the network state management unit 13a.
- it is determined whether or not the wireless band exceeds the recovery threshold value for a certain period of time, for example. If it exceeds, go to step S57, otherwise end.
- the radio band status is set to normal for the network status management unit 13a.
- FIG. 11 is a diagram showing a quality management table.
- the quality control table T1 is provided corresponding to the network devices 111 to 11-n.
- the device identifier is an identifier indicating whether the corresponding network device is a wireless LAN or a mobile phone network.
- the radio wave condition is the radio wave intensity in the current communication.
- the band status is the radio band quality in the current communication.
- the device status indicates whether the corresponding network device is usable or not (whether or not it is connected to the device).
- the network status indicates whether the main interface is currently used for communication.
- the radio wave intensity drop threshold is a set value of the drop threshold.
- the signal strength restoration threshold is a set value of the restoration threshold.
- the band shortage threshold is a set value of the band shortage threshold.
- the bandwidth restoration threshold is a set value of the bandwidth restoration threshold.
- the monitoring cycle is, for example, 200 m
- the network quality index is an index calculated by weighting the network quality and the user priority.
- the network quality and priority are quantified, and the network is expressed as X network quality + 3 X priority (H,) 3 is a constant). Calculate the talk quality index.
- the network N1 has a high user priority and the network N2 has a medium user priority, if a network to be switched is selected only by priority, the network N1 is always selected. I will.
- the network quality index for the networks Nl and N2 is selected as the network to be switched (that is, a selection is made in consideration of the network quality and the priority).
- the present invention can handle both network switching based on user priority and network switching based on a network quality index.
- the network status management unit 13a holds the interface (network device) currently used as the main and the network quality status (normal or degraded) for each interface.
- a signal indicating a decrease in the signal strength is received from the signal strength monitoring unit 12a, and if the signal condition of the interface is normal, the setting value is changed to the quality degraded condition. Then, if the target interface is used as the main, a network switch request is transmitted to the network switch controller 13b.
- the signal strength monitoring unit 12a When the signal strength is monitored by the signal strength monitoring unit 12a, if the signal strength of the target interface is low, the quality is returned to normal and a network switch request is sent to the network switch control unit 13b. I do. The same control as described above is performed for the radio band quality.
- FIG. 12 is a flowchart showing the operation of the network state management unit 13a. [S61] It is determined whether a network quality monitoring event has been received. If received, branch by event type.
- the current interface Determine whether the quality of the face (network device) is degraded or normal. If the state is lowered, the setting is not changed, and the process returns to step S61 without changing. If it is the normal state, go to step S63.
- CS64 Determine whether the network device targeted for the event is the main interface. If not main, return to step S61; if main, go to step S65.
- a network switch request is transmitted to the network switch controller 13b.
- CS70 When a wireless bandwidth restoration event is received, it is determined whether the quality of the current interface (network device) targeted for the event is in an insufficient state or a normal state. In the normal state, the setting remains unchanged, and the process returns to step S61 without changing. If the band is insufficient, the procedure goes to step S71.
- network The switching control unit 13b manages the mounted network devices by prioritizing them.
- the network switching control unit 13b searches the network states of the mounted network devices in order of priority, identifies the interface having the highest priority in the normal state, Is the main interface.
- a main interface change request is transmitted to the network control unit 14 and an RS transmission request is transmitted to the handover execution unit 13c, and the state of the own unit is set to the state of waiting for RA reception. . Then, on this occasion, the RS is transmitted to the network AR. RS is output from the changed main interface.
- the reception of the RA from the AR is notified from the packet input unit 16 to the network switching control unit 13b through the terminal management unit 13d.
- the network switching control unit 13 b sends a route switching request to the network control unit 14, switches the default route, and then transmits a BU to the HA. Request to c.
- the handover is completed by the last reception of BA returned from the HA.
- FIG. 13 is a flowchart showing the operation of the network switching control unit 13b. [S81] It is determined whether an event has been received. If received, branch according to event type.
- step S82c It is determined whether to change the main interface. If it is to be changed, go to step S82d, otherwise go to step S81.
- step S83 If the event type is RA reception, it is determined whether the status is waiting for RA reception. If it is waiting for RA reception, go to step S83a; otherwise, end.
- CS 83 a Determine whether reception is from the main interface. In the case of reception from the main interface, go to step S83b, otherwise end. [S83b] A route switching request is transmitted to the network control unit 14.
- step S84 If the event type is BA reception, it is determined whether the status is waiting for BA reception. If waiting for BA reception, go to step S84a; otherwise, end.
- FIG. 14 is a flowchart showing the operation of the network switching control unit 13b.
- 5 is a flowchart of switching control based on a network quality index.
- CS86a3 Determines whether the interface state is normal or not. If not, go to step S85; otherwise, go to step S86b.
- step S86c It is determined whether to change the main interface. To change, go to step S86d; otherwise, go to step S85.
- step S87 If the event type is RA reception, determine whether the status is waiting for RA reception. If it is waiting for reception of RA, go to step S87a, otherwise end.
- step S87a It is determined whether the data is received from the main interface. If it is received from the main interface, go to step S87b, otherwise end. [S87b] A route switching request is transmitted to the network control unit 14, and the process returns to step S85.
- FIG. 15 is a diagram showing a route information list for route control.
- the router information list T2 is managed by the network control unit 14.
- the interface corresponding to the router information at the top of the figure is the main interface.
- the router list identifier is an identifier indicating whether the list is a wireless LAN router list or a cellular phone network router list.
- the router address is the address of the router connected to the current communication of the network device.
- the device name is the name of the network device Name (whether it is a wireless LAN device or a mobile phone network device).
- the signal strength state is the signal strength in the current communication.
- the band status is the radio band quality in the current communication. The device status indicates whether the corresponding network device is usable or not.
- the network status indicates whether or not it is currently used as the main interface.
- FIG. 16 is a flowchart showing the operation of the network control unit 14.
- CS 9 Determine whether an event has been received. If received, branch according to event type.
- the handover of the present invention accompanying the stop / start of the network device will be described.
- the operation of starting and stopping the network device 11 can be performed from the application 15, in the present invention, the stop is requested and the interface is switched in advance before the network device actually stops, so that the handover process can be performed at high speed. To do. As a result, the number of packet ports associated with stopping the interface in use can be reduced.
- the network device 11 When the network device 11 is in a stopped state and is requested to be activated, it performs an interface activation process and then requests switching. This is because if a switch request is sent before the start-up process is completed, the network facing the undevelopable network will become the default route and bucket loss may occur.
- the interface processing unit 14 b in the network control unit 14 changes the quality of the network device to the stop state, and then sends the network switch request to the network switch control unit 13 b. Send. Then, in the network switching control unit 13b, the network quality is usually The device with the highest priority is selected from the network devices in the state, and the handover process to the network to which the device is directed is performed.
- the interface processing unit 14b disconnects the interface of the network device.
- a network switching request is transmitted to the network switching controller 13b after executing the network device activation process.
- FIG. 17 is a flowchart showing the operation of the interface processing unit 14b. [S101] It is determined whether or not an event has been received. If received, branch by event type.
- FIG. 18 is a flowchart showing the operation of the link processing unit 14c.
- FIG. 19 is a diagram for explaining a handover of access point switching.
- the wireless LAN connects to access points 51 and 52. Initially, it is assumed that the mobile node 10 is communicating via the access point 51.
- the mobile node 10 When the radio field intensity of the access point 51 decreases, the mobile node 10 performs a handover.
- the above-described handover targets handover between heterogeneous networks, in this example, it is assumed that access points in the same network are switched.
- the switching destination is the access point 52 and the handover is performed.
- the signal strength of the currently connected wireless communication is weakened, and when the wireless LAN is selected as the next connection destination media candidate, the access that can be connected before the currently connected wireless communication becomes unavailable cannot be established.
- Search for a point when the connection with the connected wireless communication cannot be maintained, the handover is instantaneously realized to the access point searched in advance and the communication is continued. Since the detailed control of the access point handover is the same as the handover control between heterogeneous networks, the description of the detailed control is omitted.
- switching of access points in the same wireless LAN has been described. However, switching of access points between different wireless LANs may be performed (for example, access on wireless LAN 5a). Switching from point 51a to access point 51b on wireless LAN 5b).
- the present invention it is possible to control a network connection in a stable state by setting a lowering threshold value and a recovery threshold value for each of the radio wave intensity / radio band threshold values and performing network switching control.
- Can be Even in a region where the radio wave intensity changes, such as near the boundary of a wireless network, it is possible to minimize the occurrence of network flutter and the accompanying noise, and to provide users with stable, high-quality communications. Can be provided.
- the mopile node of the present invention transmits a care-of address to an address registration destination and changes a route of communication information before communication is disconnected, according to a state of network quality, and A handover was performed to switch the connection destination to the network, the care-of address was updated at the address registration destination, and the communication function with the network before switching was maintained until the communication was disconnected.
- the Mopile IP network As described above, the mopile node of the present invention transmits a care-of address to an address registration destination and changes a route of communication information before communication is disconnected, according to a state of network quality, and A handover was performed to switch the connection destination to the network, the care-of address was updated at the address registration destination, and the communication function with the network before switching was maintained until the communication was disconnected.
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Abstract
Description
Claims
Priority Applications (6)
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CNB028297679A CN100409716C (zh) | 2002-12-19 | 2002-12-19 | 移动节点 |
AU2002368478A AU2002368478A1 (en) | 2002-12-19 | 2002-12-19 | Mobile node |
JP2004561996A JP4312155B2 (ja) | 2002-12-19 | 2002-12-19 | モバイルノード |
US11/106,269 US7680081B2 (en) | 2002-12-19 | 2005-04-14 | Mobile node |
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PCT/JP2002/013331 WO2004057903A1 (ja) | 2002-12-19 | 2002-12-19 | モバイルノード |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2004057903A1 (ja) | 2006-04-27 |
AU2002368478A1 (en) | 2004-07-14 |
US20050176432A1 (en) | 2005-08-11 |
US7680081B2 (en) | 2010-03-16 |
EP1575320B1 (en) | 2016-11-23 |
CN1689362A (zh) | 2005-10-26 |
EP1575320A1 (en) | 2005-09-14 |
JP4312155B2 (ja) | 2009-08-12 |
CN100409716C (zh) | 2008-08-06 |
EP1575320A4 (en) | 2010-06-23 |
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