JP2024012244A - Mobile terminal handover using lower address memory that stores lower addresses of mac addresses as device for adding, dropping, and passing packets in ring network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packet transfer system and a method that realize handover of a wireless system at low cost and at high speed.

SOLUTION: A base station discards a packet when a MAC address of a mobile terminal arriving from a ring network is a packet of a home IPv4 address or a home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than an own base station in a case where a destination IP address of a packet flow of a destination MAC address is changed to a home IPv4 address or a home IPv6 address wrapped in a care-of address of a IPv6 address of the own base station from a packet of a home IPv4 address or a home IPv6 address wrapped in a care-of address which is not the IPv6 address of the own base station.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to handover of a mobile terminal using a lower address memory that stores lower addresses of MAC addresses as a device for adding, dropping, and passing packets in a ring network. In the present invention, a transfer packet in which a MAC address portion of an IPv6 address of an Ethernet (registered trademark) frame or an IPv6 packet is used as an Ethernet address is referred to as a MAC packet.

A conventional example of an address storage method is JP-A No. 2000-151617 "Table Creation and Search Device" in Patent Document 1. This conventional example relates to a MAC address storage circuit, and includes a first table composed of a RAM having a matrix address, a MAC address data area, and an index area, and a RAM having a matrix address, a MAC address data area, and an index area. The second table consists of the following table. In this conventional example, the entire 48 bits of the MAC address are stored at location A, which specifies the memory of the first table using the lower bit string (for example, 16 bits). If another MAC address is already stored in that location A, it is recorded in a free address location B in the memory of the second table, and the recorded address location B is stored in the address location A of the first table. Store in the index area. This is a method of specifying recording areas by nesting.

Further, as a conventional technique of an address storage method, there is Patent Document 2, JP-A No. 2004-15592 entitled "MAC address pointer structure and MAC address sorting method". This conventional example is a method of storing a plurality of MAC addresses at the same address position in an entry table specified by a lower bit string. If there is no free area, the MAC address is stored in an entry table specified by a lower bit string different from the lower bit string of the MAC address.

As a conventional example of a ring type network, a ring network using a master switch and a slave switch as in Patent Document 3 is common. In this ring network, one ring port of the master switch is a blocked port that does not allow frames to pass, to prevent congestion due to flooding. When a failure occurs in the ring network, the monitoring frames that go out from the master switch and return to the master switch no longer reach the master switch, and instead failure notification frames arrive at the master switch from the slave switch at the point of failure. unblocks the blocked port and allows the frame to pass. In addition, a block port is set on the failed transmission line side of one of the slave switches at the failure point, and the operation of the ring network is maintained even after the ring network failure is recovered.

Further, as a conventional example of handover in a wireless network, there is Patent Document 4. This prior art performs a network handover in which a control station that transfers ATM cells communicates with a mobile terminal via a base station based on the delay D1 from the control station to the mobile terminal via the source base station, and the delay D1 between the control station and the mobile terminal via the source base station. In the case of the difference in delay D2 from the base station to the mobile terminal (D1-D2>0), the ATM cell is delayed at the control station when the base station of the ATM cell sent from the control station to the mobile terminal is switched, This method is implemented by switching to prevent the order of ATM cells from being reversed.

Further, as an example of another handover method, there is Patent Document 5. This prior art has a base station between the mobile terminal and the server, a connection via the base station before switching via the gateway, and a connection via the switching destination base station, and packets via the connection reduce downtime when the connection is switched. It's a method.

Japanese Patent Application Publication No. 2000-151617 Japanese Patent Application Publication No. 2004-15592 Re-table No. 2008-068813 Japanese Patent Application Publication No. 2001-128212 Re-table No. 2017-195497

A conventional example of a conventional address storage method, JP-A No. 2000-151617, stores MAC addresses by nesting, so there is a problem in that it takes time to trace the destination of a stored address. Furthermore, since the entire 48 bits of the essential MAC address are stored, there is a problem that the storage area becomes large.

Furthermore, a conventional example of a conventional address storage method, JP-A-2004-15592, states that if there is no space in the entry table position of the MAC address specified by the lower bit string, the MAC address is stored in the entry table position of a different lower bit string. However, in that case, when selecting the location to store the MAC address, the entry table location specified by the two lower bit strings must be searched, and the same address location in the same entry table must be searched. Since there are multiple storage addresses, it is necessary to compare these multiple addresses, and there is a problem that the search takes time.
Searching for a MAC address using the lower bit string becomes faster, but basically the method of storing the entire MAC address in the lower bit string position is accurate storage, but since the entire 48 bits must be stored, the number of stored addresses decreases. There are fewer problems.
Patent Document 3, which is a conventional ring network, uses a MAC address table using 48 bits of MAC addresses, so it has the disadvantage that it can only store a small number of MAC addresses.

In Patent Document 4 for conventional handover, it is necessary to find the difference in delay between the pre-switching route and the post-switching route from the control station to the mobile terminal, and the control is complicated. Since the delay can only be measured as half of the round trip time from the terminal to the mobile terminal, there is a problem in that the accuracy of the delay time measurement is lacking.

Further, in the conventional handover disclosed in Patent Document 5, two connections are provided between the server and the mobile terminal for switching, so it is necessary to identify the two connections, which has the disadvantage of complicating handover control.

An object of the present invention is to use a conventional address storage method that does not use a MAC address table in a lower address memory that stores lower addresses of MAC addresses, and to facilitate simple handovers and mobile terminals using a ring network using the memory. The purpose of this study is to show a method for realizing short-distance movement of people.

The present invention has been made in view of the problems of the prior art described above, and a first aspect of the present invention as a means for solving the problems is to insert a plurality of packet add, drop, and pass devices into a ring network. , a wireless base station is connected to the packet adding, dropping, and passing device, and a mobile terminal under the wireless base station receives Ethernet (registered trademark) other than OAM packets arriving from the clockwise ring of the ring network. TCP or Information is transferred as UDP MAC packets to the router within one domain, and IP packets are transferred between the router and the server.One-way UDP packet transfer and TCP packet transfer to the mobile terminal of the network are performed during other calls. A packet transfer system that repairs the packet transfer path at the time of handover or vertical handover of a mobile terminal, and performs handover or vertical handover of a mobile terminal during a call with low delay and low packet discard,
If a copy bit is attached to a packet arriving from the ring network, and if the destination MAC address of the packet is stored in the MAC address table of its own base station, the base station stores the MAC address in the MAC address storage location. means for storing a mark bit, and when a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of its own base station, and the mark bit is stored at that position; and means for adding a mark bit to the packet and transmitting it to a ring network,
or
The base station stores the MAC address of another mobile terminal having the same lower address as the lower address of the destination MAC address of the packet, when a copy bit is added to the packet arriving from the ring network. , and if the destination MAC address of the packet is stored in the MAC address table of its own base station, and if an erase reservation bit is stored in that MAC address storage location, a mark bit is stored in that location. If a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of the own base station, and a mark bit is stored in that position, a mark bit is added to the packet. and a means for transmitting it to the ring network,
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is confirmed in the MAC address table of the own base station, the home IP address of the mobile terminal is confirmed in the IP address table, and the authentication packet with the MAC address and IP address confirmation source signal is sent to the own base station. The packet is sent from the add, drop, and pass device to the destination base station of the mobile terminal, and the ACK circuit of the packet add, drop, and pass device connected to the destination base station of the mobile terminal on the way sends the packet to the destination base station of the mobile terminal. When a copy packet of an authentication packet is received, the transfer of the authentication packet to a lower address memory that specifies packet transmission outside the ring of the device and a lower address memory that specifies passage of a short-term address storage packet is performed. A lower address of the MAC address of the terminal is stored, and when the authentication packet arrives at the destination base station of the mobile terminal, the mobile terminal that has arrived previously from the mobile terminal at the destination base station of the mobile terminal Authenticates the MAC address and home IP address of the packet from the terminal, stores the IPv6 address of the own base station in the IP address table of the own base station, and stores the pair with the home IP address as the attached address (CoA), and , means for storing the MAC address of the mobile terminal in a MAC address table and transmitting the care-of address to the mobile terminal together with an authentication signal of a packet from the mobile terminal;
or
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is checked in the MAC address table of the own base station, and an erase reservation bit is stored in the MAC address storage location of the MAC address table, the home IP address of the mobile terminal is checked in the IP address table, and the MAC An authentication packet having an address and an IP address confirmation source signal is sent from the packet add, drop, and pass device connected to the own base station to the destination base station of the mobile terminal, and the mobile terminal moves on the way. When the ACK circuit of the device for adding, dropping, and passing packets connected to the destination base station receives a copy packet of the authentication packet, a lower address memory and a short-time address specifying the sending of the packet outside the ring of the device. The lower address of the MAC address of the mobile terminal included in the authentication packet is stored in a lower address memory that specifies passage of the stored packet, and when the authentication packet arrives at the destination base station of the mobile terminal, the The destination base station of the mobile terminal authenticates the MAC address and home IP address of the packet from the mobile terminal that arrived earlier from the mobile terminal, and uses the IPv6 address of the own base station as the attachment address (CoA). The pair with the home IP address is stored in the IP address table of the own base station, and the MAC address of the mobile terminal is stored in the MAC address table, and the care-of address is stored together with the authentication signal of the packet from the mobile terminal. , means for transmitting to the mobile terminal;
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at the add, drop, or pass device, if no mark bit is attached to the packet, and the packet's source MAC address is stored in the lower address memory that specifies packet transmission outside the ring. If the lower address is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and if a mark bit is added to the packet, the packet is sent as is. a counterclockwise ring through the apex device to the server;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , if the packet is directed to the server via a vertex device in a counterclockwise ring and the packet arrives at a device for adding, dropping, and passing packets, the packet is not marked with a mark bit, and , if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is stored in the address table that specifies the passage of the packet. means for storing the packet and, if a mark bit is attached to the packet, directing the packet as it is to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy it to the copy packet. passing through the device without any bits or with copy bits;
In addition to the above, when a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies sending the packet outside the ring, the packet is sent out outside the ring. This is a packet transfer system that uses

In a second aspect of the present invention, the base station according to the first aspect of the present invention is configured such that the destination IP address of the packet flow whose MAC address is the destination MAC address of the mobile terminal arriving from the ring network is the IPv6 address of the own base station. A base station other than the own base station when a packet with a home IPv4 address or home IPv6 address wrapped in a care-of address that is not an address changes to a home IPv4 address or home IPv6 address wrapped in a care-of address of the own base station's IPv6 address. In the case of a packet with a home IPv4 address or a home IPv6 address wrapped in a care-of address of an IPv6 address, the packet forwarding system is equipped with means for discarding the packet.

A third aspect of the present invention is that the copy packet receiving ACK circuit of the authentication packet according to the first aspect of the present invention transmits the ACK packet to the source base station by receiving a copy packet of the authentication packet from the source base station. This is a packet transfer system that includes means for sending to a base station.

A fourth aspect of the present invention is that the authentication packet copy packet reception ACK circuit according to the first aspect of the present invention receives a short-time address storage packet after a certain period of time after receiving the authentication packet copy packet. Deleting the lower address of the MAC address of the mobile terminal from the lower address memory that specifies passage, and specifying the adding, dropping, and passage of packets connected to the source base station to send the packet outside the ring. A packet transfer system comprising means for sending a packet for deleting a lower address of the MAC address of the mobile terminal from a lower address memory and for causing the MAC address of the mobile terminal to be deleted from the MAC address table of the source base station. It is.

A fifth aspect of the present invention is to insert a plurality of packet add, drop, and pass devices into a ring network, connect a wireless base station to the packet add, drop, and pass devices, and connect the wireless base station to the wireless base station. The mobile terminal of the ring network blocks the passage of packets (MAC packets) that are transferred using the MAC address portion of the IPv6 address as the MAC address of the MAC packet or the Ethernet frame other than the OAM packet arriving from the clockwise ring. In order to communicate with a server connected to a vertex device via a router, information is transferred within one domain to the router as TCP or UDP MAC packets, and IP packets are transferred between the router and the server. During unidirectional UDP packet transfer and TCP packet transfer to a terminal, the packet transfer path is repaired during handover or vertical handover of another mobile terminal during a call, and when the mobile terminal during a call is handed over or A method for performing vertical handover with low delay and low packet discard, comprising:
If a copy bit is attached to a packet arriving from the ring network, and if the destination MAC address of the packet is stored in the MAC address table of its own base station, the base station stores the MAC address in the MAC address storage location. a step of storing a mark bit, and when a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of the own base station, and the mark bit is stored at that position; adding a mark bit to the packet and transmitting it to a ring network;
or
The base station stores the MAC address of another mobile terminal having the same lower address as the lower address of the destination MAC address of the packet, when a copy bit is added to the packet arriving from the ring network. , and if the destination MAC address of the packet is stored in the MAC address table of its own base station, and if an erase reservation bit is stored in that MAC address storage location, a mark bit is stored in that location. step, if a packet arrives from a mobile terminal, the MAC address of the packet is stored in the MAC address table of its own base station, and a mark bit is stored in that position, the mark bit is added to the packet. and transmitting it to the ring network,
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at the add, drop, or pass device, if no mark bit is attached to the packet, and the packet's source MAC address is stored in the lower address memory that specifies packet transmission outside the ring. If the lower address is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and if a mark bit is added to the packet, the packet is sent as is. a counterclockwise ring through the apex device to the server;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , if the packet is directed to the server via a vertex device in a counterclockwise ring and the packet arrives at a device for adding, dropping, and passing packets, the packet is not marked with a mark bit, and , if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is stored in the address table that specifies the passage of the packet. storing the packet, and if a mark bit is attached to the packet, directly directing the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet. applying a bit to pass through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the packet is transmitted outside the ring. This is the method to do so.

A sixth aspect of the present invention is that when the mobile terminal according to the fifth aspect of the present invention accesses a destination base station, a request is made to the source base station of the mobile terminal to send a MAC address and an IP address authentication source packet. After sending the packet, the source base station checks the MAC address of the mobile terminal in its own base station's MAC address table, checks the home IP address of the mobile terminal in the IP address table, and determines the MAC address and IP address. An authentication packet having an address confirmation source signal is sent from the packet add, drop, and pass device connected to the own base station to the destination base station of the mobile terminal, and the packet is sent to the destination base station of the mobile terminal on the way. When the ACK circuit of the connected packet add, drop, and pass device receives the copy packet of the authentication packet, the lower address memory and short-term address memory packet specifying the sending of the packet to the outside of the ring of the device. A lower address of the MAC address of the mobile terminal included in the authentication packet is stored in a lower address memory that specifies the passage of the mobile terminal, and when the authentication packet arrives at the destination base station of the mobile terminal, The destination base station authenticates the MAC address and home IP address of the packet from the mobile terminal that arrived earlier from the mobile terminal, and uses the home IP address with the IPv6 address of the own base station as the attachment address (CoA). The care-of address is stored in the IP address table of its own base station, and the MAC address of the mobile terminal is stored in the MAC address table. The method further includes the step of sending the information to the terminal.

According to a seventh aspect of the present invention, the base station according to the fifth aspect of the present invention is configured such that the destination IP address of the packet flow whose MAC address is the destination MAC address of the mobile terminal arriving from the ring network is the IPv6 address of the own base station. A base station other than the own base station when a packet with a home IPv4 address or home IPv6 address wrapped in a care-of address that is not an address changes to a home IPv4 address or home IPv6 address wrapped in a care-of address of the own base station's IPv6 address. In the case of a packet with a home IPv4 address or a home IPv6 address wrapped in a care-of address of an IPv6 address, this method includes the step of discarding the packet.

An eighth aspect of the present invention is to insert a plurality of packet add, drop, and pass devices into a ring network, connect a wireless base station to the packet add, drop, and pass devices, and connect the wireless base station to the wireless base station. The mobile terminal of the ring network transmits the MAC address part of the IPv6 address other than the OAM packet arriving from the clockwise ring as the MAC address of the MAC packet to the apex device that blocks the passage of the forwarded packet via the router. In order to communicate with the connected server, the MAC address part of the TCP or UDP IPv6 address is used as the MAC address of the MAC packet, and the information is transferred within one domain to the router, and the information is transferred between the router and the server. performs the packet transfer route repair during handover or vertical handover of a mobile terminal during a call to another mobile terminal during one-way UDP packet transfer and TCP packet transfer to a mobile terminal in a network that transfers IP packets, and A method for performing handover or vertical handover of mobile terminals with low delay and low packet discard, comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and home IPv6 address authentication source packet to the source base station of the mobile terminal, and the source base station Check the MAC address in the MAC address table of the own base station, check the home IPv6 address of the mobile terminal in the IP address table, and connect the authentication packet with the MAC address and home IPv6 address confirmation source signal to the own base station. The packet is sent to the destination base station of the mobile terminal from a packet add, drop, and pass device, and when the authentication packet arrives at the destination base station of the mobile terminal, the packet is sent to the destination base station of the mobile terminal. The station authenticates the MAC address and home IPv6 address of the packet from the mobile terminal that arrived earlier from the mobile terminal, and uses the home IPv6 address with the own base station's IPv6 address as the attachment address (CoA). store the set in the IP address table of its own base station, store the MAC address of the mobile terminal in the MAC address table, and send the care-of address to the mobile terminal together with the authentication signal of the packet from the mobile terminal. step and
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When the packet arrives at the device for adding, dropping, and passing the packet, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent. storing the original MAC address in an address table specifying the passage of the packet, and directing the packet to the server via the apex device in a counterclockwise ring;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , the packet is directed to the server via the apex device in a counterclockwise ring, and when the packet arrives at the device for adding, dropping, and passing the packet, the lower address memory specifying the sending of the packet out of the ring is written to the server. If a lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and the packet is passed through the apex device in a counterclockwise ring. directing the server to the server;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies the passage of the packet in short-term address storage, and the lower address of the destination MAC address of the packet is used to send the packet outside the ring. If the packet is stored in a lower address memory specifying the packet, copy the packet, send the original packet out of the ring, add a copy bit to the copy packet, and pass it through the device;
Other than the above, if the destination MAC address of the packet is stored in an address table that specifies passage of the packet, the packet is passed through the device, and in other cases, the lower address of the destination MAC address of the packet is is stored in a lower address memory that specifies sending a packet outside the ring, sends the packet outside the ring, and the lower address of the destination MAC address of the packet specifies sending the packet outside the ring. if the packet is not stored in a lower address memory, passing the packet through the device;
The base station transmits packets arriving from the ring network whose home IPv6 address is wrapped in a care-of address and whose destination IP address is not the base station's IPv6 address to the packet flow whose destination MAC address is the mobile terminal's MAC address. If the packet has a home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when the packet changes to a home IPv6 address wrapped with a care-of address of an IPv6 address of The method is characterized in that it has the following characteristics.

A ninth aspect of the present invention is that when the packet sent outside the ring according to the eighth aspect of the present invention arrives at the base station, a copy bit is added to the packet, and the packet if the destination MAC address of is stored in the MAC address table of the base station, and the MAC address stored in the MAC address table is not the MAC address of the mobile terminal, copying the packet; The original packet is sent to the mobile terminal side, and the destination MAC address of the copy packet is copied to the source MAC address area of the copy packet, and a bit of the packet transfer route repair packet is added to the packet, and the packet is sent to the base station. A counterclockwise ring is used to send packets from connected devices for adding, dropping, and passing packets to the apex device, and a lower address memory and a If a lower address of the source MAC address of the packet to which the bit of the packet transfer route repair packet has been added is stored in the lower address memory that specifies the passage of the packet in the time address memory, the source of the packet The method further includes the step of storing the MAC address in an address table that specifies passage of the packet.

A tenth aspect of the present invention is to insert a plurality of packet add, drop, and pass devices into a ring network, connect a wireless base station to the packet add, drop, and pass devices, and connect the wireless base station to the wireless base station. The mobile terminal communicates with a server connected via a router to the apex device of the ring network, which blocks the passage of MAC packets other than OAM packets arriving from the clockwise ring, as TCP or UDP MAC packets. One-way UDP packet transfer and TCP packet transfer to a mobile terminal in a network where information is transferred to the router within one domain and IP packets are transferred between the router and the server, and handover of the mobile terminal during another call. A method for repairing the packet transfer path at the time of a call or a vertical handover, and performing handover or vertical handover of a mobile terminal during a call with low delay and low packet discard, the method comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is confirmed in the MAC address table of the own base station, the home IP address of the mobile terminal is confirmed in the IP address table, and the authentication packet with the MAC address and IP address confirmation source signal is sent to the own base station. The packet is sent from the add, drop, and pass device to the destination base station of the mobile terminal, and the ACK circuit of the packet add, drop, and pass device connected to the destination base station of the mobile terminal on the way sends the packet to the destination base station of the mobile terminal. When a copy packet of an authentication packet is received, the transfer of the authentication packet to a lower address memory that specifies packet transmission outside the ring of the device and a lower address memory that specifies passage of a short-term address storage packet is performed. A lower address of the MAC address of the terminal is stored, and when the authentication packet arrives at the destination base station of the mobile terminal, the mobile terminal that has arrived previously from the mobile terminal at the destination base station of the mobile terminal Authenticates the MAC address and home IP address of the packet from the terminal, stores the IPv6 address of the own base station in the IP address table of the own base station, and stores the pair with the home IP address as the attached address (CoA), and , storing the MAC address of the mobile terminal in a MAC address table and sending the care-of address to the mobile terminal together with an authentication signal of a packet from the mobile terminal;
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at a device for adding, dropping, or passing a packet, the lower address memory of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet out of the ring and the lower address memory that specifies the passing of the packet in short-term address storage. If the address is stored, the source MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the packet is stored in the lower address memory that specifies the packet transmission outside the ring. If the lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and the packet is passed through the vertex device in a counterclockwise ring. Go to the server,
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , directs the packet to the server via an apex device in a counterclockwise ring, and when the packet arrives at a packet add, drop, and pass device, a lower address memory and a short address specifying sending the packet out of the ring. If the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet passage in time address storage, the source MAC address of the packet is stored in the address table that specifies packet passage. Otherwise, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is used as the transmitter of the packet. storing the packet in an address table specifying the packet and forwarding the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet to passing through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the step of transmitting the packet outside the ring;
The base station receives packets arriving from the ring network whose MAC address of the mobile terminal is a destination MAC address, and whose destination IP address is a care-of address that is not the base station's IPv6 address and which is a home IPv4 address or a home IPv6 address. Home IPv4 address or home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when changing from to a home IPv4 address wrapped in a care-of address of the own base station's IPv6 address or a home IPv6 address , the method is characterized in that it includes the step of discarding the packet.

An eleventh aspect of the present invention is to insert a plurality of packet add, drop, and pass devices into a ring network, connect a wireless base station to the packet add, drop, and pass devices, and connect the wireless base station to the wireless base station. The mobile terminal of the ring network transmits the MAC address part of the IPv6 address other than the OAM packet arriving from the clockwise ring as the MAC address of the MAC packet to the apex device that blocks the passage of the forwarded packet via the router. In order to communicate with the connected server, the MAC address part of the TCP or UDP IPv6 address is used as the MAC address of the MAC packet, and the information is transferred within one domain to the router, and the information is transferred between the router and the server. performs the packet transfer route repair during handover or vertical handover of a mobile terminal during a call to another mobile terminal during one-way UDP packet transfer and TCP packet transfer to a mobile terminal in a network that transfers IP packets, and A method for performing handover or vertical handover of mobile terminals with low delay and low packet discard, comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send a home IPv6 address authentication source packet to the source base station of the mobile terminal, and the source base station transmits the home IPv6 address of the mobile terminal. is confirmed in the IP address table, and an authentication packet having a home IPv6 address confirmation source signal is sent from the packet add, drop, and pass device connected to the own base station to the destination base station of the mobile terminal. , when the authentication packet arrives at the destination base station of the mobile terminal, the destination base station of the mobile terminal authenticates the home IPv6 address of the packet from the mobile terminal that arrived previously from the mobile terminal. The IPv6 address of the own base station is used as the attachment address (CoA), and the pair with the home IPv6 address is stored in the IP address table of the own base station, and the care-of address is used as the authentication signal of the packet from the mobile terminal. and sending it to the mobile terminal,
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at a device for adding, dropping, or passing a packet, the lower address memory of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet out of the ring and the lower address memory that specifies the passing of the packet in short-term address storage. If the address is stored, the source MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the packet is stored in the lower address memory that specifies the packet transmission outside the ring. If the lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies the passage of the packet, and the packet is passed through the apex device in a counterclockwise ring. Directed to the server,
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , when the packet is directed to the server via the apex device in a counterclockwise ring, and when the packet reaches the device for adding, dropping, and passing the packet, a lower address memory and a short memory specifying the sending of the packet out of the ring is provided. If the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet passage in time address storage, the source MAC address of the packet is stored in the address table that specifies packet passage. Otherwise, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is used as the transmitter of the packet. storing the packet in an address table specifying the packet and directing the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet to passing through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the step of transmitting the packet outside the ring;
The base station transmits packets arriving from the ring network whose home IPv6 address is wrapped in a care-of address and whose destination IP address is not the base station's IPv6 address to the packet flow whose destination MAC address is the mobile terminal's MAC address. If the packet has a home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when the packet changes to a home IPv6 address wrapped with a care-of address of an IPv6 address of The method is characterized in that it has the following characteristics.

As described above, the present invention provides a lower address memory that stores only the lower address part of a MAC address in place of the conventional MAC address table, and a mis-allocation caused by mismatching of MAC addresses that occurs when using the lower address memory. The ring network uses an address table that specifies the passage of packets with a small number of memorized MAC addresses in the device (node device) for adding, dropping, and passing packets in the ring network to avoid handover of mobile terminals within one domain. When a mobile terminal receives packets from the source base station and destination base station during handover or vertical handover, there is no packet order reversal, no packet loss, and little delay. This has the effect of reducing power consumption and system cost, and enabling high-speed communication.

Addition of a packet having an address table that specifies the passage of a packet according to the first embodiment of the present invention, a lower address memory that specifies the sending of the packet to the outside of the ring, and a lower address memory that specifies the passage of the short-term address storage packet. Adding, dropping and passing devices of a dual ring network in which a plurality of devices for adding, dropping and passing the packets are connected by optical rings. Diagram for explaining an example of handover operation in a packet transfer system between servers connected to a network Addition of a packet having an address table that specifies the passage of a packet according to the first embodiment of the present invention, a lower address memory that specifies the sending of the packet to the outside of the ring, and a lower address memory that specifies the passage of the short-term address storage packet. , a diagram illustrating a configuration example of a lower address memory that specifies packet sending out of the ring of a drop and pass device.

A first embodiment of the present invention will be described with reference to FIG. This embodiment has an address table that specifies the passage of packets, a lower address memory that specifies the sending of packets to the outside of the ring, and a lower address memory that specifies the passage of short-term address storage packets. The information is transferred as MAC packets to the router through the wireless base station connected to the packet add, drop, and pass device in a double ring network in which multiple transit devices are connected via optical transmission lines. This is an example of a handover operation in which a mobile terminal can also receive UDP one-way packets using a ring network in a packet transfer system between servers connected to the ring network. The server is an Internet connection server or a content server.

In FIG. 1, 1 is a counterclockwise optical ring of the subscriber system, 2 is a clockwise optical ring of the subscriber system, 5 is a vertex device, and 6-1, 6-2, and 6-3 are packet add, drop, and pass packets. 7 is a lower address memory that specifies packet transmission to the outside of the ring, 8 is an address table that specifies the passage of packets, 10 is a lower address memory that specifies the passage of short-term address storage packets, and 11 is a base station. 22 is a router, 12-1, 12-2, 12-3 are base stations, 13-1, 13-2, 13-3. is a UDP mobile terminal, 14 is a mobile terminal, and 20 is a server. Further, (1) to (28) are packets, and I0, I1, I2, I3, and I4 are domestic or regional IPv4 addresses of the service provider. Or an IPv6 address.
Note that the address table 8 that specifies the passage of packets is different from conventional MAC address tables in that it is an address table that does not store port numbers and stores only a small number of MAC addresses.

The operation of FIG. 1 will be explained below. First, it is assumed that the UDP mobile terminals 13-1, 13-2, and 13-3 have already stored the IP address I1 of the router 22 and the MAC address r1r2 of the ring transmission path interface in their ARP tables. The UDP mobile terminal 13-2 receives a packet (1) Mr1r2a3a2 (I0) (M indicates an Ethernet packet, r1 indicates the upper MAC address of the router 22 interface, r2 indicates the lower MAC address of the router 22 interface, and a3a2 The MAC addresses of the UDP mobile terminal 13-2 (indicates the upper MAC address a3 and lower MAC address a2, and I0 indicates the IP address of the destination server 20) are sent to the packet adding, dropping, and passing device 6-1. An example of sending is shown below. When the packet reaches the add, drop, and pass device 6-1 from the UDP mobile terminal 13-2, the lower address a2 of the source MAC address of the packet is used as the lower address that specifies packet transmission outside the ring. It is stored in the address memory 7. The packet is transferred in the counterclockwise optical ring 1 by (2) Mr1r2a3a2 (I0) as shown in the figure, and arrives at the packet add, drop, and pass device 6-2.

When the packet (2) Mr1r2a3a2 (I0) arrives at the packet add, drop, and pass device 6-2, the lower address a2 of the source MAC address of the packet is a lower address that specifies packet transmission outside the ring. Since it is not stored in the memory 7, the packet is transferred in the counterclockwise optical ring 1 by (3) Mr1r2a3a2 (I0) as shown in the figure, and arrives at the packet add, drop and pass device 6-3.
When the packet (3) Mr1r2a3a2 (I0) arrives at the packet add, drop, and pass device 6-3, the lower address a2 of the source MAC address of the packet is the lower address that specifies the packet transmission outside the ring. Since it is not stored in the memory 7, the packet is transferred in the counterclockwise optical ring 1 by (4) Mr1r2a3a2 (I0) as shown in the figure, and reaches the vertex device 5. The packet is sent out of the ring and reaches router 22.
When the packet (5) Mr1r2a3a2 (I0) arrives at the router 22, the source MAC address a3a2 and source IP address I2 of the packet are stored in the memory 1 (not shown). The output port corresponding to the destination IP address I0 of the packet is found, and the packet is sent to that port. The packet is shown in the diagram by (6) IPI3I0 (IP indicates an IP address, I3 indicates the IP address of the source mobile terminal 13-2, and I0 indicates the IP address of the destination server 20). The data is transferred as follows and reaches the server 20.

Next, the UDP mobile terminal 13-1 sends a packet (7) Mr1r2a1a2 (I0) (M indicates an Ethernet packet, r1 indicates the upper MAC address of the router 22 interface, and r2 indicates the lower MAC address of the router 22 interface. , a1a2 indicates the upper MAC address a1 and lower MAC address a2, which are the MAC addresses of the terminal 13-1, and I0 indicates the IP address of the destination server 20). Send to. When the packet reaches the add, drop, and pass device 6-1 from the UDP mobile terminal 13-1, the lower address a2 of the source MAC address of the packet is used as the lower address that specifies packet transmission outside the ring. It is stored in the address memory 7. The packet is transferred in the counterclockwise optical ring 1 by (8) Mr1r2a1a2 (I0) as shown in the figure, and arrives at the packet add, drop, and pass device 6-2.

When the packet (8) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-2, the lower address a2 of the source MAC address of the packet is a lower address that specifies packet transmission outside the ring. Since it is not stored in the memory 7, the packet is transferred by (9) Mr1r2a1a2 (I0) in the counterclockwise optical ring 1 as shown in the figure, and passes through the packet add, drop and pass device 6-3, The vertex device 5 is reached.
The packet that has arrived at the apex device 5 is sent out of the ring and reaches the router 22.

When the packet (11) Mr1r2a1a2 (I0) arrives at the router 22, the packet's source MAC address a1a2 and source IP address I2 are stored in the memory 1 (not shown), and then the packet's destination IP address I0 is stored. Reads the output port corresponding to and sends to that port. The packet is as shown in the figure by (12) IPI2I0 (IP indicates an IP address, I2 indicates the IP address of the source terminal 13-1, and I0 indicates the IP address of the destination server 20). and reaches the server 20.

Next, the UDP mobile terminal 13-2 moves from the LTE base station 12-1 to the WIFI base station 12-2, and the mobile terminal 13-2 sends a message to the mobile terminal according to a command from the control station. When accessing the destination base station 12-2 advertising base station signals, or when the UDP mobile terminal 13-2 moves from the LTE base station 12-1 to the WIFI base station 12-2, When accessing the destination base station 12-2, a request packet (13) Mr1r2a3a2 (I0) for sending the MAC address and IP address authentication source packet is sent to the source base station 12-1 of the mobile terminal 13-2, and the Since the MAC address of the mobile terminal is stored in the MAC address table of its own base station, which is not shown in the diagram, the former base station 12-1 stores the erase preparation bit in the MAC address storage location, and Check the MAC address of 13-2 in the MAC address table not shown in the diagram of the own base station, check the home IPv6 address of the mobile terminal in the IP address table not shown in the diagram, and confirm the MAC address and IP address. The authentication packet containing the original signal is sent from the packet add, drop, and pass device 6-1 connected to its own base station to the destination base station 12-2 of the mobile terminal 13-2, and the packet is sent to the destination base station 12-2 of the mobile terminal 13-2. The destination base station 12-2 of 13-2 authenticates the MAC address and home IPv6 address of the packet from the mobile terminal 13-2 that has already arrived from the mobile terminal 13-2. 2 as the attachment address, the home IPv6 address of the mobile terminal 13-2 is stored in the IP address table of its own base station, and the MAC address a3a2 of the mobile terminal is stored in a MAC address table not shown in the figure. Then, the care-of address is sent to the mobile terminal 13-2 together with an authentication signal. Packet with care-of IPv6 address from mobile terminal 13-2 that received the packet from the destination base station (14) Mr1r2a3a2 (B2) (I0) (B2 is the MAC address part of the care-of address of base station 12-2) (corresponding to the MAC address) arrives at the base station 12-2, the packet add, drop, and pass device 6-2 connected to the destination base station heads toward the server 20 on the counterclockwise ring 1. Since this is a packet immediately after changing the destination base station when the device connects to a base station in the direction, a signal gr to that effect is inserted into the packet, and the packet is sent to the device 6-2 for adding, dropping, and passing packets. Send. The movement of the mobile terminal 13-2 from the base station 12-1 to the base station 12-2 is a vertical handover. When the packet from the UDP mobile terminal 13-2 reaches the add, drop, and pass device 6-2, the lower address a2 of the source MAC address of the packet is stored in the lower address memory that specifies the packet transmission outside the ring. 7, and also stores the lower address a2 of the source MAC address of the packet in the lower address memory 10 that specifies passage of the packet. The packet is transferred in the counterclockwise optical ring 1 by (15) Mr1r2a3a2 (B2) gr (I0) as shown in the figure, and goes to the packet add, drop, and pass device 6-3.

When the packet (15) Mr1r2a3a2 (B2) gr (I0) arrives at the packet add, drop, and pass device 6-3, the packet is a packet that has just moved from the base station, and the source MAC address of the packet is Since the lower address a2 of is not stored in the lower address memory 7 that specifies packet transmission to the outside of the ring, the packet is sent in the counterclockwise optical ring 1 by (16) Mr1r2a3a2(B2)gr(I0) as shown in the figure. and reaches the apex device 5.
The packet that has arrived at the apex device 5 is sent out of the ring and reaches the router 22.

When the packet (17) Mr1r2a3a2(B2)gr(I0) arrives at the router 22, after storing the packet's source MAC address and source IP address in the memory 1 (not shown), the destination IP address of the packet is stored. Reads the output port corresponding to address I0 and sends data to that port. Although the packet (17) Mr1r2a3a2(B2)gr is given a signal gr indicating that the destination base station is a packet immediately after moving closer to the server, it is ignored and the IP packet of the packet is sent to the server 20. The packet (18) IPI3I0 (IP indicates an IP address, I3 indicates the IPv6 address of the source terminal 13-2, and I0 indicates the IP address of the destination server 20) is transferred as shown in the figure. and reaches the server 20.

Next, when packet (19) IPI0I3 (IP indicates an IP address, I3 indicates the IPv6 address of the terminal 13-2, and I0 indicates the IP address of the server 20) from the server 20 arrives at the router 22, , Copy the destination MAC address a3a2 of the destination IPv6 address I3 of the packet from the MAC address part of the destination IPv6 address, convert it into a MAC packet, and convert the MAC packet (20) Ma3a2r1r2(B2)(I3) (B2 is The MAC address part of the destination IP care-of address (corresponding to the MAC address of the base station 12-2) is sent to the clockwise ring 2.

When the packet (21) Ma3a2r1r2 (B2) (I3) is transferred on the clockwise ring 2 and arrives at the packet add, drop, and pass device 6-3, the destination MAC address a3a2 of the packet is Since the packet is not stored in the address table 8 that specifies passage, and the lower address of the destination MAC address of the packet is not stored in the lower address memory 7 that specifies sending the packet outside the ring, the packet is sent to the clockwise ring. It is sent forward as (22) Ma3a2r1r2 (B2) (I3).
When the packet (22) Ma3a2r1r2 (B2) (I3) arrives at the packet add, drop, and pass device 6-2, the destination MAC address a3a2 of the packet is stored in the address table 8 that specifies the pass of the packet. , the lower address a2 of the destination MAC address of the packet is stored in the lower address memory 7 that specifies sending the packet outside the ring, and the lower address a2 of the destination MAC address of the packet is a short-term address. Since it is stored in the lower address memory 10 that specifies the passage of the stored packet, the packet is copied and the original packet is sent out as (23) Ma3a2r1r2 (B2) (I3), and the copied packet is is given a copy bit and sent to clockwise ring 2 as (25) Ma3a2r1r2 (B2) (I3).

When the packet (23) Ma3a2r1r2 (B2) (I3) sent outside the ring arrives at the base station 12-2, the destination MAC address a3a2 of the packet is stored in a MAC address table not shown in the figure. , since the MAC address part of the care-of address of the destination IP address is the same as the MAC address of the base station 12-2, it is sent to the mobile terminal 13-2 as (24) Ma3a2r1r2 (B2).

When the packet sent as (25) Ma3a2r1r2 (B2) (I3) to the clockwise ring 2 arrives at the packet add, drop, and pass device 6-1, the destination MAC address of the packet is A packet that is not stored in the specified address table 8, the lower address a2 of the destination MAC address of the packet is stored in the lower address memory 7 that specifies sending the packet outside the ring, and the address is stored for a short time. is not stored in the lower address memory 10 that specifies passage of the packet, and the destination MAC address of the packet is not stored in the address table 8 that specifies passage of the packet, and the destination MAC of the packet is Since the lower address a2 of the address is stored in the lower address memory 7 that specifies packet transmission to the outside of the ring, the packet is transmitted to the outside of the ring as (26) Ma3a2r1r2 (B2). When the packet arrives at the base station 12-1, a copy bit is added to the packet, and the MAC address a1a2 of another mobile terminal with the same lower address as the destination MAC address of the packet is shown in the figure. The destination MAC address a3a2 of the packet is stored in a MAC address table not shown, and the erase reservation bit is added to the stored MAC address. Therefore, a mark bit is stored in the position of the MAC address a3a2 in the MAC address table (not shown in the figure), and the packet is not copied, but the MAC address part of the care-of address of the destination IP address of the packet is set to B2. Since it does not match the MAC address B1 of the own base station 12-1, the packet is discarded. Note that the mark bit is used in the packet when the destination MAC address of the packet arriving from the mobile terminal is stored in a MAC address table (not shown) and the mark bit is stored in the MAC address storage location. A mark bit is attached, and the packet with the mark bit attached arrives at a device for adding, dropping, and passing packets through a counterclockwise ring, and the lower address of the source MAC address of the packet specifies sending the packet outside the ring. The source MAC address of the packet is not stored in the address table 8 that specifies passage of the packet, even if it is stored in the lower address memory.
In addition, the lower address of the source MAC address of the packet arriving from the counterclockwise ring is stored in the lower address memory that specifies sending the packet out of the ring and the lower address memory that specifies the passage of the packet in short-term address storage. In some cases, the source MAC address of the packet may not be stored in the address table that specifies passage of the packet.

Here, the operation when Ma1a2r1r2 (I2) to which a copy bit has been added arrives at the packet add, drop, and pass device 6-1 will be described. The destination MAC address a1a2 of the packet is not stored in the address table 8 that specifies passage of the packet, and the lower address a2 of the destination MAC address of the packet is stored in the lower address memory 7 that specifies packet transmission outside the ring. and the lower address a2 of the destination MAC address of the packet is not stored in the lower address memory 10 that specifies passage of the packet in short-term address storage, and the lower address a2 of the destination MAC address of the packet does not specify the packet to be sent outside the ring. Since the packet is stored in the designated lower address memory 7, the packet is sent out of the ring. When the packet arrives at the base station 12-1, a copy bit is added to the packet, and the MAC address a3a2 of another mobile terminal with the same lower address as the destination MAC address of the packet is shown in the figure. Therefore, even if a copy bit is added to the packet, there is no mark bit in the MAC address table (not shown) where the destination MAC address a1a2 of the packet is stored. Since the erase reservation bit is not attached to the stored MAC address a1a2 position, the packet is copied and the original packet is transferred to Ma1a2r1r2(I2) (this packet has a care-of address attached) in the wireless section. or the care-of address of the IPv6 address of base station 12-1 is sent, but the care-of address is not attached here), and the copy packet is sent with the address copied from the destination MAC address of the packet. The packet Ma1a2a1a2 is inserted into the source MAC address field and given a bit of the packet transfer route repair packet, and sent from the packet add, drop, and pass device 6-1 connected to the base station 12-1 to the counterclockwise ring 1. Send as.
When the packet to which the bit of the packet transfer route repair packet sent to the counterclockwise ring 1 is added arrives at the packet add, drop, and pass device 6-2, the lower order of the source MAC address of the packet Since the address is stored in the lower address memory 7, which specifies packet transmission to the outside of the ring, and the lower address memory 10, which specifies the passage of the packet in short-term address storage, the source MAC address a1a2 of the packet is is stored in the address table specifying the packet, and the packet is directed to the vertex device 5 via the counterclockwise ring.

The lower address memory for specifying packet sending outside the ring of the device for adding, dropping, and passing packets in the ring network shown in FIG. 1 divides the lower address of the source MAC address of the packet into an upper part and a lower part, Addressing the SRAM with the parallel data of the logical sum of each bit of the latch output of the parallel data read from the position addressed in the SRAM of the memory system in the upper part and each bit of the parallel data decoded in the lower part. A memory that inserts and stores the lower part of the lower address of the source MAC address by storing it in the lower address position, bit 1 at the bit 1 position of decoding as bit 1 meaning lower address storage,
When deleting the lower address of the source MAC address from the lower address memory that specifies sending packets outside the ring, delete the lower address memory that specifies sending packets outside the ring with the upper part of the lower address of the source MAC address. The latch signal of the parallel data, which is the AND of each bit of the parallel data read from the addressed position and the bit-inverted bit of each bit of the parallel data decoded from the lower part of the lower address of the source MAC address, is sent to the outside of the ring. By storing the lower part of the lower address of the source MAC address in the address specified position of the lower address memory that specifies packet transmission, insert bit 0 into the bit 1 position of decoding as bit 0, which means that the lower address is not stored. This is a low-order address memory for specifying packet adding, dropping, and passing devices of a ring network of a packet transfer system, which stores packets outside the ring.

The configuration method of the lower address memory mentioned above is based on "Only the originating terminal address" in Communication method vol 113 No, 207, September 12-13, 2013 of IEICE Technical Report CS2013-28-CS2013-40. This is disclosed in Chapter 3, ``Address storage method using data storage areas as addresses'' on page 44 of ``Proposal of MAC-operated tree-like ring network that transfers packets in both directions''. It is also disclosed in Japanese Patent Application Laid-open No. 2019-097045 (address memorization method). This method can also be configured as shown in FIG.
In FIG. 2, storage of a lower address and erasure of a lower address are switched and operated under the control of a bit 0 write signal (H) which is a signal for erasing a lower storage address. To store/erase the lower address, the 32 bits of parallel data at the position specified by the upper part (17 bits) of the lower address of the MAC address is taken into the logic circuit, and the lower part (5 bits) of the lower address of the MAC address is stored in the SRAM. The 32-bit parallel data resulting from the calculation with the decoded signal is written to the SRAM again. The logic circuit is composed of a small LSI, FPGA, or ASIC, and uses external SRAM.

1 Subscriber system counterclockwise optical ring
2 Subscriber system clockwise optical ring 5 Vertex devices 6-1, 6-2, 6-3 Device for adding, dropping, and passing packets 7 Lower address memory 8 for specifying sending of packets outside the ring Address table 10 for specifying Lower address memory 12-1, 12-2, 12-3 for specifying passage of short-term address storage packets Base stations 13-1, 13-2, 13-3, 13-4 Mobile terminal 14 Movement of mobile terminal 20 Server 22 Router

Claims (11)

A plurality of packet add, drop and pass devices are inserted into a ring network, a radio base station is connected to the packet add, drop and pass devices, and a mobile terminal under the radio base station is connected to the ring network. , a vertex that blocks the passage of packets (hereinafter referred to as MAC packets) that are transferred using the MAC address part of the IPv6 address as the MAC address of the MAC packet or the Ethernet (registered trademark) frame other than the OAM packet arriving from the clockwise ring. In order to communicate with a server connected to the device via a router, information is transferred within one domain to the router as TCP or UDP MAC packets, and IP packets are transferred between the router and the server to the mobile terminal of the network. The packet transfer path is repaired at the time of handover or vertical handover of the mobile terminal in the middle of a call, and the handover or vertical handover of the mobile terminal in the middle of a call is performed in one-way UDP packet transfer and TCP packet transfer. A packet transfer system that performs overflow with low delay and low packet discard,
If a copy bit is attached to a packet arriving from the ring network, and if the destination MAC address of the packet is stored in the MAC address table of its own base station, the base station stores the MAC address in the MAC address storage location. means for storing a mark bit, and when a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of its own base station, and the mark bit is stored at that position; and means for adding a mark bit to the packet and transmitting it to a ring network,
or
The base station stores the MAC address of another mobile terminal having the same lower address as the lower address of the destination MAC address of the packet, when a copy bit is added to the packet arriving from the ring network. , and if the destination MAC address of the packet is stored in the MAC address table of its own base station, and if an erase reservation bit is stored in that MAC address storage location, a mark bit is stored in that location. If a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of the own base station, and a mark bit is stored in that position, a mark bit is added to the packet. and a means for transmitting it to the ring network,
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is confirmed in the MAC address table of the own base station, the home IP address of the mobile terminal is confirmed in the IP address table, and the authentication packet with the MAC address and IP address confirmation source signal is sent to the own base station. The packet is sent from the add, drop, and pass device to the destination base station of the mobile terminal, and the ACK circuit of the packet add, drop, and pass device connected to the destination base station of the mobile terminal on the way sends the packet to the destination base station of the mobile terminal. When a copy packet of an authentication packet is received, the transfer of the authentication packet to a lower address memory that specifies packet transmission outside the ring of the device and a lower address memory that specifies passage of a short-term address storage packet is performed. A lower address of the MAC address of the terminal is stored, and when the authentication packet arrives at the destination base station of the mobile terminal, the mobile terminal that has arrived previously from the mobile terminal at the destination base station of the mobile terminal Authenticates the MAC address and home IP address of the packet from the terminal, stores the IPv6 address of the own base station in the IP address table of the own base station, and stores the pair with the home IP address as the attached address (CoA), and , means for storing the MAC address of the mobile terminal in a MAC address table and transmitting the care-of address to the mobile terminal together with an authentication signal of a packet from the mobile terminal;
or
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is checked in the MAC address table of the own base station, and an erase reservation bit is stored in the MAC address storage location of the MAC address table, the home IP address of the mobile terminal is checked in the IP address table, and the MAC An authentication packet having an address and an IP address confirmation source signal is sent from the packet add, drop, and pass device connected to the own base station to the destination base station of the mobile terminal, and the mobile terminal moves on the way. When the ACK circuit of the device for adding, dropping, and passing packets connected to the destination base station receives a copy packet of the authentication packet, a lower address memory and a short-time address specifying the sending of the packet outside the ring of the device. The lower address of the MAC address of the mobile terminal included in the authentication packet is stored in a lower address memory that specifies passage of the stored packet, and when the authentication packet arrives at the destination base station of the mobile terminal, the The destination base station of the mobile terminal authenticates the MAC address and home IP address of the packet from the mobile terminal that arrived earlier from the mobile terminal, and uses the IPv6 address of the own base station as the attachment address (CoA). The pair with the home IP address is stored in the IP address table of the own base station, and the MAC address of the mobile terminal is stored in the MAC address table, and the care-of address is stored together with the authentication signal of the packet from the mobile terminal. , means for transmitting to the mobile terminal;
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at the add, drop, or pass device, if no mark bit is attached to the packet, and the packet's source MAC address is stored in the lower address memory that specifies packet transmission outside the ring. If the lower address is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and if a mark bit is added to the packet, the packet is sent as is. a counterclockwise ring through the apex device to the server;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , if the packet is directed to the server via a vertex device in a counterclockwise ring and the packet arrives at a device for adding, dropping, and passing packets, the packet is not marked with a mark bit, and , if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is stored in the address table that specifies the passage of the packet. means for storing the packet and, if a mark bit is attached to the packet, directing the packet as it is to the server via a vertex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address is stored in the lower address memory that specifies packet sending out of the ring, copy the packet, send the original packet out of the ring, and copy it to the copy packet. passing through the device without applying a bit or with applying a copy bit;
In addition to the above, when a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies sending the packet outside the ring, the packet is sent out outside the ring. packet transfer system.
The base station receives packets arriving from the ring network whose MAC address of the mobile terminal is a destination MAC address, and whose destination IP address is a care-of address that is not the base station's IPv6 address and which is a home IPv4 address or a home IPv6 address. Home IPv4 address or home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when changing from to a home IPv4 address wrapped in a care-of address of the own base station's IPv6 address or a home IPv6 address 2. The packet transfer system according to claim 1, further comprising means for discarding the packet if the packet is a packet of .
The packet transfer system according to claim 1, wherein the copy packet reception ACK circuit for the authentication packet includes means for transmitting an ACK packet to the source base station by receiving the copy packet for the authentication packet from the source base station. .
The copy packet reception ACK circuit for the authentication packet receives the lower address of the MAC address of the mobile terminal from the lower address memory that designates passage of the packet in short-term address storage after a certain period of time after receiving the copy packet for the authentication packet. and delete a lower address of the MAC address of the mobile terminal from a lower address memory that specifies packet sending outside the ring of a device for adding, dropping, and passing packets connected to the source base station; The packet transfer system according to claim 1, further comprising means for transmitting a packet for deleting the MAC address of the mobile terminal from the MAC address table of the source base station.
A plurality of packet add, drop and pass devices are inserted into a ring network, a radio base station is connected to the packet add, drop and pass devices, and a mobile terminal under the radio base station is connected to the ring network. , connect via a router to an apex device that blocks the passage of packets (MAC packets) that are transferred using the MAC address part of the Ethernet frame or IPv6 address as the MAC address of the MAC packet and the MAC address part of the MAC packet or the MAC address of the IPv6 address other than the OAM packet arriving from the clockwise ring. In order to communicate with the server, information is transferred within one domain as TCP or UDP MAC packets to the router, and IP packets are transferred between the router and the server, and one-way UDP packet transfer to the mobile terminal of the network is performed. During TCP packet transfer, the packet transfer path is repaired at the time of handover or vertical handover of another mobile terminal during a call, and the handover or vertical handover of the mobile terminal during a call is performed with low delay and low packets. A method of disposal,
If a copy bit is attached to a packet arriving from the ring network, and if the destination MAC address of the packet is stored in the MAC address table of its own base station, the base station stores the MAC address in the MAC address storage location. a step of storing a mark bit, and when a packet from a mobile terminal arrives, the MAC address of the packet is stored in the MAC address table of the own base station, and the mark bit is stored at that position; adding a mark bit to the packet and transmitting it to a ring network;
or
The base station stores the MAC address of another mobile terminal having the same lower address as the lower address of the destination MAC address of the packet, when a copy bit is added to the packet arriving from the ring network. , and if the destination MAC address of the packet is stored in the MAC address table of its own base station, and if an erase reservation bit is stored in that MAC address storage location, a mark bit is stored in that location. step, if a packet arrives from a mobile terminal, the MAC address of the packet is stored in the MAC address table of its own base station, and a mark bit is stored in that position, the mark bit is added to the packet. and transmitting it to the ring network,
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at the add, drop, or pass device, if no mark bit is attached to the packet, and the packet's source MAC address is stored in the lower address memory that specifies packet transmission outside the ring. If the lower address is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and if a mark bit is added to the packet, the packet is sent as is. a counterclockwise ring through the apex device to the server;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , if the packet is directed to the server via a vertex device in a counterclockwise ring and the packet arrives at a device for adding, dropping, and passing packets, the packet is not marked with a mark bit, and , if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is stored in the address table that specifies the passage of the packet. storing the packet, and if a mark bit is attached to the packet, directly directing the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet. applying a bit to pass through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the method further comprises the step of transmitting the packet outside the ring. How to do it.
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is checked in the MAC address table of the own base station, the home IP address of the mobile terminal is checked in the IP address table, and the authentication packet with the MAC address and IP address confirmation source signal is sent to the own base station. The packet is sent from the add, drop, and pass device to the destination base station of the mobile terminal, and the ACK circuit of the packet add, drop, and pass device connected to the destination base station of the mobile terminal on the way sends the packet to the destination base station of the mobile terminal. When a copy packet of the authentication packet is received, the transfer of the authentication packet to the lower address memory that specifies packet transmission outside the ring of the device and the lower address memory that specifies the passage of the short-term address storage packet is performed. The lower address of the MAC address of the terminal is stored, and when the authentication packet arrives at the destination base station of the mobile terminal, the mobile terminal that has arrived previously from the mobile terminal at the destination base station of the mobile terminal authenticates the MAC address and home IP address of the packet from the terminal, stores the pair with the home IP address with the IPv6 address of the own base station as the attachment address (CoA) in the IP address table of the own base station, and , further comprising the steps of: storing the MAC address of the mobile terminal in a MAC address table; and transmitting the care-of address to the mobile terminal together with an authentication signal of a packet from the mobile terminal. the method of.
The base station receives packets arriving from the ring network whose MAC address of the mobile terminal is a destination MAC address, and whose destination IP address is a home IPv4 address or home IPv6 address wrapped in a care-of address that is not the base station's IPv6 address. Home IPv4 address or home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when changing from to a home IPv4 address wrapped in a care-of address of the own base station's IPv6 address or a home IPv6 address 7. A method according to claim 5 or claim 6, further comprising the step of discarding the packet if the packet is.
A plurality of packet add, drop and pass devices are inserted into a ring network, a radio base station is connected to the packet add, drop and pass devices, and a mobile terminal under the radio base station is connected to the ring network. , to communicate with a server connected via a router to a vertex device that uses the MAC address part of the IPv6 address other than OAM packets arriving from the clockwise ring as the MAC address of the MAC packet to block the passage of forwarded packets. A mobile terminal in a network that uses the MAC address part of the TCP or UDP IPv6 address as the MAC address of the MAC packet to transfer information to the router within one domain, and transfers IP packets between the router and the server. The packet transfer path is repaired at the time of handover or vertical handover of the mobile terminal in the middle of a call, and the unidirectional UDP packet transfer and TCP packet transfer to the mobile terminal in the middle of a call is performed. A method for performing handover with low delay and low packet discard, comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and home IPv6 address authentication source packet to the source base station of the mobile terminal, and the source base station Check the MAC address in the MAC address table of the own base station, check the home IPv6 address of the mobile terminal in the IP address table, and connect the authentication packet with the MAC address and home IPv6 address confirmation source signal to the own base station. The packet is sent to the destination base station of the mobile terminal from a packet add, drop, and pass device, and when the authentication packet arrives at the destination base station of the mobile terminal, the packet is sent to the destination base station of the mobile terminal. The station authenticates the MAC address and home IPv6 address of the packet from the mobile terminal that arrived earlier from the mobile terminal, and uses the home IPv6 address with the own base station's IPv6 address as the attachment address (CoA). store the set in the IP address table of its own base station, store the MAC address of the mobile terminal in the MAC address table, and send the care-of address to the mobile terminal together with the authentication signal of the packet from the mobile terminal. step and
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When the packet arrives at the device for adding, dropping, and passing the packet, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent. storing the original MAC address in an address table specifying the passage of the packet, and directing the packet to the server via the apex device in a counterclockwise ring;
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , the packet is directed to the server via the apex device in a counterclockwise ring, and when the packet arrives at the device for adding, dropping, and passing the packet, the lower address memory specifying the sending of the packet out of the ring is written to the server. If a lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and the packet is passed through the apex device in a counterclockwise ring. directing the server to the server;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies the passage of the packet in short-term address storage, and the lower address of the destination MAC address of the packet is used to send the packet outside the ring. If the packet is stored in a lower address memory specifying the packet, copy the packet, send the original packet out of the ring, add a copy bit to the copy packet, and pass it through the device;
Other than the above, if the destination MAC address of the packet is stored in an address table that specifies passage of the packet, the packet is passed through the device, and in other cases, the lower address of the destination MAC address of the packet is is stored in a lower address memory that specifies sending a packet outside the ring, sends the packet outside the ring, and the lower address of the destination MAC address of the packet specifies sending the packet outside the ring. if the packet is not stored in a lower address memory, passing the packet through the device;
The base station transmits packets arriving from the ring network whose home IPv6 address is wrapped in a care-of address and whose destination IP address is not the base station's IPv6 address to the packet flow whose destination MAC address is the mobile terminal's MAC address. If the packet has a home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when the packet changes to a home IPv6 address wrapped with a care-of address of an IPv6 address of A method characterized by having.
When a packet sent outside the ring arrives at a base station, a copy bit is added to the packet, and the destination MAC address of the packet is stored in the MAC address table of the base station. If the MAC address stored in the MAC address table is not the MAC address of the mobile terminal, the packet is copied, the original packet is sent to the mobile terminal, and the destination of the copied packet is The packet with the MAC address copied to the source MAC address area of the copy packet and the bit of the packet transfer route repair packet added is sent from the packet add, drop, and pass device connected to the base station by a counterclockwise ring. , forwarding the packet to a lower address memory that specifies the addition, drop, and passing of the packet to the apex device, sending the packet out of the ring of the device, and a lower address memory that specifies the passing of the packet in short-term address storage. If a lower address of the source MAC address of the packet to which the bit of the route repair packet has been added is stored, the step of further storing the source MAC address of the packet in an address table specifying passage of the packet. 9. The method according to claim 8, comprising:
A plurality of packet add, drop and pass devices are inserted into a ring network, a radio base station is connected to the packet add, drop and pass devices, and a mobile terminal under the radio base station is connected to the ring network. In order to communicate with a server connected via a router to a vertex device that blocks the passage of MAC packets other than OAM packets arriving from the clockwise ring, information is sent within one domain as TCP or UDP MAC packets to the router. The packet is transferred between the router and the server, and the packet is transferred between the router and the server during a handover or vertical handover of a mobile terminal during a call, for unidirectional UDP packet transfer and TCP packet transfer to the mobile terminal of the network. A method of repairing a transfer route and performing handover or vertical handover of a mobile terminal during a call with low delay and low packet discard, the method comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send the MAC address and IP address authentication source packet to the source base station of the mobile terminal, and the source base station The address is confirmed in the MAC address table of the own base station, the home IP address of the mobile terminal is confirmed in the IP address table, and the authentication packet with the MAC address and IP address confirmation source signal is sent to the own base station. The packet is sent from the add, drop, and pass device to the destination base station of the mobile terminal, and the ACK circuit of the packet add, drop, and pass device connected to the destination base station of the mobile terminal on the way sends the packet to the destination base station of the mobile terminal. When a copy packet of an authentication packet is received, the transfer of the authentication packet to a lower address memory that specifies packet transmission outside the ring of the device and a lower address memory that specifies passage of a short-term address storage packet is performed. A lower address of the MAC address of the terminal is stored, and when the authentication packet arrives at the destination base station of the mobile terminal, the mobile terminal that has arrived previously from the mobile terminal at the destination base station of the mobile terminal Authenticates the MAC address and home IP address of the packet from the terminal, stores the IPv6 address of the own base station in the IP address table of the own base station, and stores the pair with the home IP address as the attached address (CoA), and , storing the MAC address of the mobile terminal in a MAC address table and sending the care-of address to the mobile terminal together with an authentication signal of a packet from the mobile terminal;
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at a device for adding, dropping, or passing a packet, the lower address memory of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet out of the ring and the lower address memory that specifies the passing of the packet in short-term address storage. If the address is stored, the source MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the packet is stored in the lower address memory that specifies the packet transmission outside the ring. If the lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies passage of the packet, and the packet is passed through the vertex device in a counterclockwise ring. Go to the server,
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , directs the packet to the server via an apex device in a counterclockwise ring, and when the packet arrives at a packet add, drop, and pass device, a lower address memory and a short address specifying sending the packet out of the ring. If the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet passage in time address storage, the source MAC address of the packet is stored in the address table that specifies packet passage. Otherwise, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is used as the transmitter of the packet. storing the packet in an address table specifying the packet and forwarding the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet to passing through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the step of transmitting the packet outside the ring;
The base station receives packets arriving from the ring network whose MAC address of the mobile terminal is a destination MAC address, and whose destination IP address is a care-of address that is not the base station's IPv6 address and which is a home IPv4 address or a home IPv6 address. Home IPv4 address or home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when changing from to a home IPv4 address wrapped in a care-of address of the own base station's IPv6 address or a home IPv6 address , the method comprises the step of discarding the packet.
A plurality of packet add, drop and pass devices are inserted into a ring network, a radio base station is connected to the packet add, drop and pass devices, and a mobile terminal under the radio base station is connected to the ring network. , to communicate with a server connected via a router to a vertex device that uses the MAC address part of the IPv6 address other than OAM packets arriving from the clockwise ring as the MAC address of the MAC packet to block the passage of forwarded packets. A mobile terminal in a network that uses the MAC address part of the TCP or UDP IPv6 address as the MAC address of the MAC packet to transfer information to the router within one domain, and transfers IP packets between the router and the server. The packet transfer path is repaired at the time of handover or vertical handover of the mobile terminal in the middle of a call, and the unidirectional UDP packet transfer and TCP packet transfer to the mobile terminal in the middle of a call is performed. A method for performing handover with low delay and low packet discard, comprising:
When the mobile terminal accesses the destination base station, it sends a request packet to send a home IPv6 address authentication source packet to the source base station of the mobile terminal, and the source base station transmits the home IPv6 address of the mobile terminal. is confirmed in the IP address table, and an authentication packet having a home IPv6 address confirmation source signal is sent from the packet add, drop, and pass device connected to the own base station to the destination base station of the mobile terminal. , when the authentication packet arrives at the destination base station of the mobile terminal, the destination base station of the mobile terminal authenticates the home IPv6 address of the packet from the mobile terminal that arrived previously from the mobile terminal. The IPv6 address of the own base station is used as the attachment address (CoA), and the pair with the home IPv6 address is stored in the IP address table of the own base station, and the care-of address is used as the authentication signal of the packet from the mobile terminal. and sending it to the mobile terminal,
When a MAC packet from the mobile terminal via the base station arrives at the packet adding, dropping and passing device of the ring network,
If the packet is a packet immediately after changing the destination base station and has a new care-of address of IPv6 address as the source IP address,
The lower address of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, and the source MAC address of the packet is stored in the lower address memory that specifies the passage of the packet in short-term address storage. , deletes the source MAC address of the packet from an address table specifying the passage of the packet, and directs the packet to the server via the apex device in a counterclockwise ring, so that the packet is When a packet arrives at a device for adding, dropping, or passing a packet, the lower address memory of the source MAC address of the packet is stored in the lower address memory that specifies sending the packet out of the ring and the lower address memory that specifies the passing of the packet in short-term address storage. If the address is stored, the source MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the packet is stored in the lower address memory that specifies the packet transmission outside the ring. If the lower address of the source MAC address of the packet is stored, the source MAC address of the packet is stored in an address table that specifies the passage of the packet, and the packet is passed through the apex device in a counterclockwise ring. Directed to the server,
If the packet is not a packet immediately after changing the destination base station,
storing a lower address of the source MAC address of the packet in a lower address memory that specifies packet transmission outside the ring, and deleting the source MAC address of the packet from an address table that specifies passage of the packet; , when the packet is directed to the server via the apex device in a counterclockwise ring, and when the packet reaches the device for adding, dropping, and passing the packet, a lower address memory and a short memory specifying the sending of the packet out of the ring is provided. If the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet passage in time address storage, the source MAC address of the packet is stored in the address table that specifies packet passage. Otherwise, if the lower address of the source MAC address of the packet is stored in the lower address memory that specifies packet transmission outside the ring, the source MAC address of the packet is used as the transmitter of the packet. storing the packet in an address table specifying the packet and directing the packet to the server via the apex device in a counterclockwise ring;
If a packet other than the communication start packet from the server arrives at the packet add, drop, and pass device from the clockwise ring,
If the destination MAC address of the packet is stored in an address table that specifies packet passage, or if the lower address of the packet destination MAC address is stored in a lower address memory that specifies packet transmission outside the ring. If not, the packet is passed through the device, and the lower address of the destination MAC address of the packet is stored in a lower address memory that specifies passage of the packet in short-term address storage, and the packet is passed through the device. If the lower address of the destination MAC address of is stored in the lower address memory that specifies sending a packet out of the ring, copy the packet, send the original packet out of the ring, and copy the copied packet to passing through the device;
In addition to the above, if a lower address of the destination MAC address of the packet is stored in a lower address memory that specifies packet transmission outside the ring, the step of transmitting the packet outside the ring;
The base station transmits packets arriving from the ring network whose home IPv6 address is wrapped in a care-of address and whose destination IP address is not the base station's IPv6 address to the packet flow whose destination MAC address is the mobile terminal's MAC address. If the packet has a home IPv6 address wrapped in a care-of address of an IPv6 address of a base station other than the own base station when the packet changes to a home IPv6 address wrapped with a care-of address of an IPv6 address of A method characterized by having.