CN1770780B - Mobile terminal management system, mobile terminal, agent, and program - Google Patents

Mobile terminal management system, mobile terminal, agent, and program Download PDF

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Publication number
CN1770780B
CN1770780B CN2005101185415A CN200510118541A CN1770780B CN 1770780 B CN1770780 B CN 1770780B CN 2005101185415 A CN2005101185415 A CN 2005101185415A CN 200510118541 A CN200510118541 A CN 200510118541A CN 1770780 B CN1770780 B CN 1770780B
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China
Prior art keywords
portable terminal
address
communication
base station
radio base
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CN1770780A (en
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矢萩雅彦
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NEC Corp
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NEC Corp
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Abstract

In a mobile communication network, the foreign agent function of a mobile terminal that makes a small number of moves is placed in a radio base station, and the foreign agent function of a mobile terminal that makes a large number of moves is placed in a first node setting and managing a radio access link with a mobile terminal connected through a radio base station, thereby preventing concentration of foreign agent functions on the first node. When a mobile terminal (MN) detects a move to a foreign link to be connected, it acquires a new c/o address and transmits a binding update request to which a communication party list is attached to a home agent. The home agent transmits a binding update request to report a pair of the new c/o address and the home address of the mobile terminal to the communication parties in the communication party list.

Description

Mobile terminal management system, portable terminal, agency, and program
Technical field
The present invention relates to a kind of processing such as personal digital assistant and the cell phone mobile terminal network (particularly, packet networks), more particularly, relate to a kind of in advance with communication party of c/o address notification of a portable terminal, thereby motion that can managing mobile terminal, and packet directly can be sent to the mobile terminal management system of portable terminal.
Background technology
The purpose of mobile IP (Mobile IP) is in the time of will moving to another subnet at the subnet that portable terminal has linked from portable terminal, and making this portable terminal to not be used in has any change ground to communicate by letter with a communication party in its IP address.In mobile IP, a node that moves and change the subnet that connects continuously is called " portable terminal " (mobile node (Mobile Node): be abbreviated as MN), the subnet of the initial link of portable terminal is called " link-local " (link-local (HomeLink): be abbreviated as HL), with exist in the link-local and portable terminal not process in the node be responsible for be called " local agent " (local agent (Home Agent): be abbreviated as HA), the subnet of a portable terminal actual link is called " distinguishing outer link " and (distinguishes outer link (ForeignLink); Be abbreviated as FL), one is existed in the outer link in district, the node of looking after this portable terminal with time in the link outside portable terminal is being distinguished is called " agency outside the district " (agency (Foreign Agent) is abbreviated as FA outside the district), and an address of distributing to portable terminal outside distinguishing in the link is called " c/o address " (Care-of Address (Care-of Address); Be abbreviated as COA), and a subnet that is independent of connection, only the address of distributing to portable terminal be called " local address ".Communications of Mobile Terminals side's (communication node (Correspondence Node) is described in passing; Be abbreviated as CN) comprise fixed terminal and portable terminal.
In network based on mobile IP, IPv4 and IPv6, the following processing procedure of general execution.
What list below is processing procedure according to mobile IP.
(1) under the situation of portable terminal in link-local
As the situation of general T CP/IP, the used for mobile terminal common mode is communicated by letter with the communication party.
(2) at portable terminal not under the situation in link-local
It is not the position of link-local at certain that portable terminal detects it, and carry out " local registration ", that is, notify a new c/o address by distinguishing outer agency to local agent, so that all packets that send to the local address of portable terminal can be forwarded to portable terminal.
(2-1) data packet arrival
The packet that sends to local address from the communication party arrives link-local by normal IP Route Selection mechanism.Local agent captures packet by Proxy ARP (agent address translation-protocol), and by tunnel (tunneling) packet is forwarded to outside the district in the net at portable terminal place and acts on behalf of.Therefore, portable terminal receives packet.
(2-2) transmission of packet
When portable terminal sent to the communication party with packet, the header of each IP packet still comprised the local address as source address.On the way take place under the situation of any mistake packet to be sent to local address, turn back to portable terminal by said mechanism then.
Illustrate in passing that the mobile communication service for broadband access more at a high speed is provided is promoting the standardization of mobile communication system " IMT2000 " now, one of main service provides the IP data packet communication.Now investigating the method as the location management of the online portable terminal of IMT2000 with mobile IP.
Fig. 9 shows the schematic diagram of imagination as the structure of an IP packet exchange net of IMT2000 net.In Fig. 9, portable terminal 1121 and 1122 respectively has one by the IP packet exchange net IP address allocated (local address) as the IMT2000 of management subject, and utilizes packet data support node (Packet Data Support Node:PDSN) the 1106 or 1107 foundation/managing radio access link in their positions of moving to through radio base station 1102 to 1105.
Packet data gateway node (Packet Data Gateway Node:PDGN) 1108 provides the local agent function of mobile IP, and the function of the gateway router that IMT2000 packet exchange net is connected with an IP kernel heart net 1111 such as the internet.
Each packet data support node 1106 and 1107 is arranged in the district of each regulation of IMT2000 packet exchange net, and supports the radio base station 1102 to 1105 of specific quantity.Portable terminal 1121 and 1122 foundation/managing radio access link that packet data support node 1106 and 1107 is connected with them through radio base stations 1102 to 1105 utilization, and agent functionality outside the district of mobile IP also is provided.In addition, packet data support node 1106 and 1107 plays from the effect of the default router of portable terminal 1121 and 1122 packets that send.
In having the IMT2000 net of this structure, carry out following processing procedure.
At first, portable terminal 1121 utilizes the packet data support node 1106 that distributes with respect to each radio base station to set up the radio access link onlyly, to send a mobile IP registration request.Receive after the mobile IP registration request, packet data support node 1106 is forwarded to packet data gateway node 1108 with request.When receiving mobile IP registration request, relevance between the IP address of packet data gateway node 1108 managing mobile terminals 1121 and the IP address of the terminal 1121 current packet data support nodes 1106 that are connected, and a mobile IP register response turned back to packet data support node 1106.The mobile IP register response that packet data support node 1106 will receive is forwarded to portable terminal 1121, and the relevance between the link ID of the IP address of managing mobile terminal 1121 and radio access link.
Packet data gateway node 1108 captures all IP packets that send to portable terminal 1121 from a communication party who is connected to IP kernel heart net 1111, and packet is forwarded to the packet data support node of acting on behalf of as outside the district of portable terminal 1,121 1106 by IP tunnel (tunnel).The IP packet of IP tunnel is received in 1106 reconstruct of packet data support node, and utilizes related link ID that packet is forwarded to portable terminal 1121 through the radio access link.On the other hand, packet data support node 1106 is carried out Route Selection according to their destination, and the IP packet that sends from portable terminal 1121 is forwarded to communication party 1112.In addition, will send to the IP packet of another portable terminal 1122 from sending to packet data gateway node 1108 from portable terminal 1121 as the packet data support node of acting on behalf of outside the district of the portable terminal 1121 the transmitting terminal 1106.Packet data gateway node 1108 is forwarded to packet data support node 1107 as agency outside the district of the portable terminal 1122 of receiving terminal by IP tunnel with the IP packet.Therefore, portable terminal 1122 receives the IP packet.
The example that is used for the procotol of handle mobile terminal comprises mobile IPv 4 and IPv6.But,, therefore in mobile IP v 6, do not act on behalf of outside the district because the effect of agency outside the district is played by portable terminal and IPv6 mechanism.
What list below is processing procedure according to mobile IPv 4 and IPv6.
(1) under the situation of portable terminal in link-local
As the situation of general T CP/IP, the common mode of used for mobile terminal is communicated by letter with the communication party.
(when adopting IPv6, the portable terminal request of will registering directly sends to local agent.)
(2-1) data packet arrival
In IPv6, the portable terminal that has received the packet of process of passing through tunnel forwarding sends to the communication party who sends packet with a new registration request, and gives the communication party c/o address notification.After this, the communication party directly sends to portable terminal according to the c/o address with packet.
(2-2) transmission of packet
When adopting IPv6, be source address with the c/o address setting, and local address be appointed as the destination option of a redetermination.
Summary of the invention
Utilization is envisioned for the structure based on the IP packet networks of the IMT2000 net of mobile IP, supports the packet data support node of the radio base station of specific quantity to have the function of acting on behalf of outside the district of portable terminal.As a result, when the IP packet arrived suddenly a plurality of portable terminal the zone that the radio base station that belongs to the packet data support node covers from extranets, the load on the packet data support node increased sharply.
Therefore, an object of the present invention is to prevent as the load centralization on the node of agent apparatus outside the district of portable terminal.
In addition, adopt the network of mobile IPv 4 or IPv6 also to have some problems.Under the situation of IPv4, to send through home agent apparatus inevitably owing to be addressed to the packet of portable terminal, thereby exist the problem of so-called triangle route.Under the situation of IPv6, in order to solve the problem of triangle route, the portable terminal that has received the packet that sends by the tunnel is by determining that the communication party does not know the c/o address, new option is notified to the communication party as connecting more with the c/o address, and the communication party directly sends to portable terminal according to the c/o address with packet.But, to transmit through home agent apparatus inevitably from first packet that the communication party who does not still know the c/o address sends, therefore cause amount of information excessive.In addition, suppose that many communication parties begin that suddenly packet is sent to same portable terminal or local agent and are based upon a plurality of portable terminals on the same node, load centralization is on home agent apparatus or interdependent node.
Therefore, another object of the present invention is that a kind of mobile terminal management system will be provided, in this mobile terminal management system, give a plurality of communication parties with the nearest c/o address notification of portable terminal, thereby make the communication party can not disturb home agent apparatus, directly first packet is sent to portable terminal.
A further object of the present invention is to reduce the load on the portable terminal to the c/o address when giving advance notice to a plurality of communication party.
For mobile IP, mobile terminal management system of the present invention comprises a first node, support a plurality of radio base stations and utilize each portable terminal that connects by radio base station to set up/the managing radio access link, with a Section Point, provide the gateway router device that is connected to IP kernel heart net and the home agent apparatus of portable terminal.In the mobile radio communication that the mobile communication service is provided to a plurality of portable terminals, agent functionality outside the district of some portable terminals is arranged in the radio base station of the current use of each portable terminal, and agent apparatus outside the district of other portable terminal is arranged in the first node of the radio base station of supporting the current use of portable terminal.
When the position of each portable terminal of registration, making relevant is to be arranged in agent apparatus outside the district of each portable terminal in the radio base station or to be arranged in decision in the first node.Session between portable terminal and its communication party can change the position of acting on behalf of outside the district of each portable terminal.
Can be according to the information that is stored in the user data of mobile terminal, make agent apparatus outside the relevant district of each portable terminal and be arranged in the radio base station or be arranged in decision in the first node.In this occasion, can be according to the motion/mobility of portable terminal, or the frequency of acting on behalf of conversion on the portable terminal outside the time per unit district is maked decision.In addition, can be according to the model or the type of portable terminal, or make decision according to the availability/use of the resource in the packet networks of mobile communication.
In addition, before next position register request, can change the position of agent apparatus outside the district of portable terminal.In this occasion, can be between portable terminal and its communication party session change the position of agent apparatus outside the district of each portable terminal.Can be according to the availability/use of the resource in the packet networks of mobile radio communication, or response is from the delay request of user's application program of portable terminal, change the position of agent apparatus outside the district of portable terminal.
For the network that uses mobile IPv 4 and IPv6, according to the present invention, comprising a plurality of interconnected subnets, and handle in the network of portable terminal of each a c/o address that all has a subnet that depends on the current connection of portable terminal and a local address that has no truck with, when portable terminal changes to another subnet that will connect, with the nearest c/o address of portable terminal and local address to being notified to a plurality of communication parties.More particularly, portable terminal comprises the device that is used to store and manage communication party's tabulation, with be used for when the subnet that is connected changes, sending one and connect update request and have the device of the new c/o address of communication party's tabulation with report, and have one and be used for receiving and connect update request and the agent apparatus of c/o address and local address recently to each communication party of being notified to communication party's tabulation.
Be used to store and comprise with the device of supervisory communications side's tabulation and to be used for by monitoring that communicating by letter on the portable terminal set up communication party's the device of tabulation of the most frequent communication of a fixed qty.
The present invention can be applicable to the network based on mobile IP v 6 and IPv4.Under the situation of mobile IP v 6, agent apparatus is corresponding to the home agent apparatus of portable terminal, and under the situation of mobile IPv 4, agent apparatus is corresponding to the outer agent apparatus of home agent apparatus or district of portable terminal.
Function
For mobile IP, in mobile terminal management system according to the present invention, agent functionality outside the district of a plurality of portable terminals is distributed to first node and each radio base station that belongs to first node.Therefore, even when a plurality of portable terminal of arriving suddenly from the IP packet of a core net such as the internet in the zone that covers by the radio base station that belongs to first node, also can prevent on the node of load centralization agent functionality outside the district is provided (radio base station and first node).
For the network that uses mobile IPv 4 and IPv6, according to the present invention, when portable terminal changes to another subnet that will connect, with the nearest c/o address of portable terminal and local address to being notified to a plurality of communication parties, for example, the communication party of frequent communication of fixed qty.As a result, each communication party can directly send to the c/o address to first packet, and this has prevented the load centralization on home agent apparatus and the interdependent node.
Description of drawings
Fig. 1 is the schematic diagram that shows system configuration according to an embodiment of the invention;
Fig. 2 is the schematic diagram of demonstration by the example of the content of the user data of mobile terminal of monitor storage and management;
Fig. 3 shows according to one embodiment of present invention, agent functionality outside the district of portable terminal is positioned at the precedence diagram of a processing procedure in the radio base station;
Fig. 4 shows according to one embodiment of present invention, agent functionality outside the district of portable terminal is positioned at the precedence diagram of the processing procedure in the first node;
Fig. 5 shows when agent functionality is arranged in the radio base station outside the district of portable terminal the precedence diagram of the processing procedure during the data packet communication between the portable terminal side of communicating with;
Fig. 6 shows when agent functionality is arranged in the first node outside the district of portable terminal the precedence diagram of the processing procedure during the data packet communication between the portable terminal side of communicating with;
Fig. 7 is the precedence diagram that agent functionality is arranged in the processing procedure during the data packet communication between the portable terminal in radio base station and the first node respectively outside the viewing area;
Fig. 8 is the precedence diagram that shows the processing procedure of acting on behalf of outside the transition zone when a radio base station moves to another when portable terminal;
Fig. 9 is the schematic diagram that shows the structure of an IP packet networks that is envisioned for the IMT2000 net;
Figure 10 is the schematic diagram that shows system construction according to an embodiment of the invention;
Figure 11 is the schematic diagram of the configuration of display communication side's tabulation;
Figure 12 is the precedence diagram that shows processing procedure according to an embodiment of the invention;
Figure 13 is the precedence diagram that shows processing procedure according to an embodiment of the invention;
Figure 14 shows to send to local agent from portable terminal, or sends to the schematic diagram of example that of communication party connects the data packet format of update request from local agent;
Figure 15 is the schematic diagram of the communication party that is presented at the c/o address of the knowing portable terminal processing procedure when packet is sent to portable terminal;
Figure 16 is the schematic diagram of the communication party that is presented at the c/o address of the not knowing portable terminal processing procedure when packet is sent to portable terminal;
Figure 17 shows the block diagram that offers communications of Mobile Terminals side list storage/management organization; With
Figure 18 is the link schematic diagram of method of clauses and subclauses of a memory and a cyclic part associative storage of an extraction unit branch showing a kind of contingency table of constituting communication party list storage/management organization of being used for classifying.
Illustrate in passing that numeral 11 is represented a mobile communication system.Numeral 12 to 15 is represented radio base station.Numeral 16 and 17 is represented first node.Numeral 18 is represented Section Point.Numeral 19 is represented monitor.Numeral 21 is represented IP kernel heart net.Numeral 22 is represented communication party ( CN).Numeral 31 and 32 is represented portable terminal (MN).Numeral 41 to 43,51 to 54 and 61 to 64 delegated paths.
Numeral 200 is represented IP kernel heart net.Numeral 201 is represented the link-local (HL) of portable terminal 204.Numeral 202 and 203 is represented link (FL) outside the district of portable terminal 204.Numeral 204 is represented a portable terminal (MN).Numeral 205 and 207 is represented the communication party (CN) of portable terminal 204.Numeral 206 is represented a local agent (HA).
Embodiment
[first embodiment]
Below with reference to accompanying drawing to a preferred embodiment of the present invention will be described in detail.
Fig. 1 is the schematic diagram that shows according to the system configuration of first embodiment of the invention.With reference to figure 1, mobile communication system 11 comprises radio base station 12 to 15, offer radio base station 12 and 13 first node 16, offer radio base station 14 and 15 first node 17, be connected to the Section Point 18 and the monitor 19 that is connected with Section Point 18 of external IP core net 21, and mobile communication system 11 provides the mobile communication service by data packet communication to portable terminal 31 and 32.In mobile communication system 11 is under the situation of IMT2000, and first node 16 and 17 is corresponding to the packet data service node, Section Point 18 corresponding to packet data gateway node and IP kernel heart net 21 corresponding to external the Internet.
Portable terminal 31 and 32 each all have one by mobile communication system 11 IP address allocated (local address) as management subject, and be equivalent to the portable terminal of mobile IP.In addition, portable terminal 31 and 32 utilizes first node 16 and 17 to develop and manage the radio access link through hithermost radio base station 12 to 15.
Section Point 18 provides the local agent function of mobile IP, and is used to connect the packet networks of mobile communication system 11 and the gateway router function of IP kernel heart net 21.In addition, Section Point 18 has the function that is used for determining agent functionality outside the district of each portable terminal 31 and 32 is arranged into one of radio base station 12 to 15, first node 16 or first node 17.Section Point 18 is connected to first node 16 and 17 through path 41 and 42 respectively, and also is directly connected to radio base station 12,13,14 and 15 through path 51,52,53 and 54 respectively.
In the first node 16 and 17 each is positioned in each regulation zone in the packet networks of mobile communication system 11, and supports the radio base station 12 to 15 (among Fig. 1, two radio base stations) of specific quantity.First node 16 and 17 utilizes the portable terminal 31 and the 32 foundation/managing radio access link of connected node 16 and 17 through radio base stations 12 to 15, and agent functionality outside the district of mobile IP is provided.In addition, first node 16 and 17 has the function of the packets from portable terminal 31 and 32 transmissions being carried out the IP route.First node 16 is connected to Section Point 18, first node 17, radio base station 12 and radio base station 13 through path 41,43,61 and 62 respectively.First node 17 is connected to Section Point 18, first node 16, radio base station 14 and radio base station 15 through path 42,43,63 and 64 respectively.
In the radio base station 12 to 15 each is positioned in the zone of each regulation in the radio district, and links with portable terminal 31 and 32 by the radio access link.Radio base station 12 to 15 is also connected to first node 16 and 17.Outside the agent functionality, radio base station 12 to 15 also provides the IP routing function except the district of mobile IP.
The user data of monitor 19 storages and relevant each portable terminal 31 of management and 32.Fig. 2 has shown the example of mobile terminal user data.Portable terminal IDNO (identification number) the 1091st is used for discerning the number of this portable terminal onlyly, and comprising that the user data of motion/mobility data 1092 stores portable terminal IDNO 1091 accordingly into.Motion/mobility data 1092 have shown the motion/mobility of portable terminal in the fixed time period in the past.Motion/mobility data 1092 comprise that comprises a tabulation 1094 and the motion/mobile attribute mark 1093 from 1094 portable terminals of determining of tabulating who has the identifier that is used radio base station that uses the date.For example, when the frequency that changes radio base station in the portable terminal fixed time period in the past is lower than a defined threshold, motion/mobile attribute mark 1093 is set to " 0 ", expression has been carried out a spot of mobile or not mobile, and when the frequency of radio base station change surpasses threshold value, be set to " 1 " expression portable terminal and carried out a large amount of moving or moving sometimes.When mobile terminal request moves the IP registration, upgrade and reference motion/mobility data 1092.
Fig. 3 to 8 is the process order figure according to first embodiment of the invention, and shows the example of the processing procedure of being carried out by portable terminal, first and second nodes and communication party.Illustrate in passing that these processing procedures are to carry out under the control by the program of the computer that constitutes portable terminal, first and second nodes and communication party in being stored in their memory.The operation of the description of drawings present embodiment of reference correspondence below.
At first, with reference to figure 3, be example with portable terminal among Fig. 1 31, illustrate agent functionality outside the district of portable terminal is arranged in processing procedure in the radio base station.
Beginning, portable terminal 31 utilizes the first node 16 of being responsible for hithermost radio base station 12 to set up radio access link (S101) through radio base station 12.Next, portable terminal 31 sends to first node 16 (S102) by the radio access link with mobile IP registration request.Mobile IP registration request relates to IP address and the identifier that portable terminal 31 is set.When receiving mobile IP registration request, first node 16 is forwarded to this request the Section Point 18 (S103) with the radio base station identifier that is used to specify radio base station 12.
When receiving mobile IP registration request, Section Point 18 is determined where to be positioned at (S104) with acting on behalf of in the district of portable terminal 31 outside.More particularly, Section Point 18 is linked into user data corresponding to the identifier of the portable terminal 31 that is provided with in the request by monitor 19, and the identifier of the radio base station 12 that is provided with in the request and current date to being registered in the tabulation 1094.After this, the change frequency of Section Point 18 from the radio base station that portable terminal uses in the fixed time period of finding out over 1094 of tabulating, and with this frequency and a defined threshold comparison.When frequency is lower than threshold value, Section Point 18 moves/and mobile attribute mark's 1093 value is set to " 0 ", and when frequency surpassed threshold value, value was set to " 1 ".When motion/mobile attribute mark's 1093 value was " 0 ", Section Point 18 was determined the agency is arranged in the radio base station.On the other hand, on duty when being " 1 ", Section Point 18 is determined the agency is arranged in the first node of supporting radio base station.Hypothesis motion/mobile attribute mark's 1093 value is " 0 " in the following description, and agent functionality is arranged in the radio base station 12 outside the district of portable terminal 31.
Its internal storage of Section Point 18 by can not see in the accompanying drawing, the IP address of managing mobile terminal 31 and the relevance of distinguishing between the outer IP address of acting on behalf of (in this example, being arranged on the radio base station 12 that the radio base station identifier in the registration request is indicated) (S105).Illustrate in passing that because Section Point 18 is known the IP address of radio base station 12 to 15, first node 16 and 17 in advance, thereby Section Point 18 uses an IP address as the outer agency in district in these addresses.Then, Section Point 18 will specify the identifier of portable terminal 31 and the mobile IP registration request of IP address to send to the radio base station 12 (S106) that is defined as distinguishing outer agency.Transmission is directly carried out through path 51.
Receiving mobile IP registers when asking, radio base station 12 is by its invisible in the accompanying drawings internal storage, the IP address and the relevance between the link ID of the radio access link of setting up between portable terminal 31 and the first node 16 of the portable terminal 31 of management request appointment, and agent functionality (S107) outside the district of generation portable terminal 31 own.That is to say that radio base station is acted on behalf of outside the 12 illustration districts.After this, radio base station 12 will specify the mobile IP register response of its identifier to send to portable terminal 31 (S108).Portable terminal 31 has known that by receiving register response mobile IP registration request is finished and the outer agency's in conduct district radio base station 12.
Next, with reference to figure 4, be example with the portable terminal among Fig. 1 32, illustrate agent functionality outside the district of portable terminal is arranged in processing procedure in the first node.
In Fig. 4, program step S201 to 203 is identical with program step S101 to 103 among Fig. 3, in these program steps, portable terminal 32 utilizes first node 17 to set up the radio access link through hithermost radio base station 15, and mobile IP registration request is sent to Section Point 18.When receiving mobile IP registration request, Section Point 18 is linked into user data corresponding to the identifier of the portable terminal 32 that is provided with in the request by monitor 19, and with the identifier of radio base station 15 and current date to being registered in the tabulation 1094.After this, if necessary, Section Point 18 upgrades motion/mobile attribute marks 1093, and determines where to be arranged in (S204) with acting on behalf of outside the district of portable terminal 32 according to the motion of upgrading/mobile attribute mark 1093.In the following description, the value of supposing motion/mobile attribute mark 1093 is " 1 ", and agent functionality is arranged in the first node 17 outside the district of portable terminal 32.
Relevance (S205) between the IP address of the Section Point 18 IP address by invisible internal memory management portable terminal 32 in its accompanying drawing and the outer agency in district (in this example, being the first node 17 of transmitting the registration request).Then, Section Point 18 will specify the identifier of portable terminal 32 and the mobile IP register response of IP address to send to the first node 17 (S206) that is defined as distinguishing outer agency.
Receive after the mobile IP register response, invisible internal storage is managed the relevance between the link ID of the radio access link of setting up between the IP address of portable terminal 32 of this response appointment and portable terminal 32 and the first node 17 in the accompanying drawing of first node 17 by it, and itself produces agent functionality (S207) outside the district of portable terminal 32.After this, first node 17 sends to portable terminal 32 to the mobile IP register response of the identifier of specifying it through radio base station 15.Portable terminal 32 has known that by receiving register response mobile IP asks to finish, and first node is identified as the outer agency in district.
Below with reference to Fig. 5 processing procedure during the outer agent functionality in district is arranged in the portable terminal 31 in the radio base station 12 and is connected to data packet communication between the communication party 22 of IP kernel heart net 21 is described.
When communication party 22 is the IP address setting of portable terminal 31 one the packet of IP address, a destination when sending to IP kernel heart net 21 (S301) wherein, the Section Point 18 with local agent function of portable terminal 31 captures packet (S302).Section Point 18 is acted on behalf of (in this example outside the district corresponding to the IP address, destination of packet obtaining with reference to internal storage, be radio base station 12) the IP address, and comprising one as the IP address of the radio base station 12 of IP address, destination and the top of adding packet to, packet is forwarded to radio base station 12 (S303) by the tunnel as the tunnel header of the IP address of the Section Point 18 of source IP address.
Radio base station 12 is from packet deletion tunnel header, so that data packet recovery is arrived its primitive form (S304), and with the link ID of acquisition, packet is forwarded to portable terminal 31 (S305) thereby process has the radio access link of relevant link ID corresponding to the radio access link of the IP address, destination of packet with reference to internal storage.
On the other hand, when portable terminal 31 sends to communication party 22 through the radio access link with a packet (S306), radio base station 12 with agent functionality outside the district of portable terminal 31 captures packet (S307), and by the method for IP route packet directly is transferred to communication party 22 (S308).
Next, with reference to figure 6, the processing procedure during the outer agency in district is arranged in the portable terminal 32 in the first node 17 and is connected to data packet communication between the communication party 22 of IP kernel heart net 21 is described.
When communication party 22 wherein is one the packet of IP address, a destination when sending to IP kernel heart net 21 (S401) with the IP address setting of portable terminal 32, the Section Point 18 with local agent function of portable terminal 32 captures packet (S402).Section Point 18 is acted on behalf of (in this example outside the district corresponding to the IP address, destination of packet obtaining with reference to internal storage, be first node 17) the IP address, and comprising as the IP address of the first node 17 of IP address, a destination and the top of adding packet to, packet is transferred to first node 17 by the tunnel as the tunnel header of the IP address of the Section Point 18 of a source address.
First node 17 from packet deletion tunnel header with data packet recovery to its primitive form (S404), and with the link ID of acquisition,, packet is forwarded to portable terminal 32 (S405) so that being passed through the radio access link with relevant link ID corresponding to the radio access link of the IP address, destination of packet with reference to internal storage.
On the other hand, when portable terminal 32 sends to communication party 22 to packet through the radio access link (S406), do not have the radio base station 15 of agent functionality outside the district of portable terminal 32 not catch packet, packet is received by first node 17.First node 17 directly is forwarded to communication party 22 (S407) to packet by the IP system of selection.
Below with reference to Fig. 7, illustrate that its outer agent functionality in district is arranged in the portable terminal 31 in the radio base station 12 and distinguishes processing procedure during outer agent functionality is arranged in data packet communication between the portable terminal 32 in the first node 17.
When portable terminal 31 when to send be the IP address setting of portable terminal 32 packet of IP address, destination wherein (S501), radio base station 12 with agent functionality outside the district of portable terminal 31 is caught packet (S502), and the method by the IP route directly is forwarded to Section Point 18 (S503) as the local agent of portable terminal 32 to packet.Section Point 18 is with reference to internal storage, to act on behalf of (in this example outside the district of acquisition corresponding to the IP address, destination of packet, be first node 17) the IP address, and comprising as the IP address of the first node 17 of IP address, a destination and the top of adding packet to, packet is forwarded to first node 17 (S504) by the tunnel as the tunnel header of the IP address of the Section Point 18 of source IP address.First node 17 is from packet deletion tunnel header, so that data packet recovery is arrived its primitive form (S505), and with reference to internal storage, with the link ID of acquisition, thereby packet is forwarded to portable terminal 32 (S506) through radio access link with relevant link ID corresponding to the radio access link of the IP address, destination of packet.
On the other hand, when portable terminal 32 sends to portable terminal 31 to a packet through the radio access link (S507), the radio base station 15 that does not have agent functionality outside the district of portable terminal 32 is not caught packet, and packet is received by first node 17.The method of first node 17 by the IP route directly is forwarded to Section Point 18 (S508) as the local agent of portable terminal 31 to packet.Section Point 18 is with reference to internal storage, to act on behalf of (in this example outside the district of acquisition corresponding to the IP address, destination of packet, be radio base station 12) the IP address, and comprising as the IP address of the radio base station 12 of IP address, a destination and the top of adding packet to, so that packet is forwarded to radio base station 12 (S509) by the tunnel as the tunnel header of the IP address of the Section Point 18 of source IP address.Radio base station 12 is from packet deletion tunnel header, so that data packet recovery is arrived its primitive form (S510), and with reference to internal storage, with the link ID of acquisition, thereby packet is forwarded to portable terminal 31 (S511) through radio access link with relevant link ID corresponding to the radio access link of the IP address, destination of packet.
Next, the processing procedure of agency outside the transition zone of portable terminal when a radio base station moves to another base station is described.The outer agency's conversion in district exists following variation.
(1) belonging under the situation about moving between the radio base station of same first node at portable terminal
(A) in the time of in the radio base station of before outer agency is arranged in portable terminal and is moving the district, communicating by letter:
(a) the outer agency in district is repositioned at portable terminal in the radio base station that moves back communication; Or
(b) the outer agency in district is repositioned in the first node.
(B) when being arranged in agency outside distinguishing in the first node:
(a) the outer agency in district is repositioned at portable terminal in the radio base station that moves back communication.Illustrate that when the agency is not repositioned in the radio base station outside the district, that is, when staying in the first node, the outer agency in district changes does not take place to agency outside distinguishing in passing.
(2) belonging under the situation about moving between the radio base station of different first node at portable terminal
(A) when outer agency is arranged in the radio base station that portable terminal communicates by letter before moving the district:
(a) the outer agency in district is repositioned in the radio base station that portable terminal communicates by letter after moving; Or
(b) the outer agency in district is repositioned in the first node of the radio base station of supporting that portable terminal is communicated by letter after moving.
(B) when outer agency is arranged in the first node of the radio base station of supporting that portable terminal is communicated by letter before moving the district:
(a) the outer agency in district is repositioned at portable terminal in the radio base station that moves back communication; Or
(b) the outer agency in district is repositioned in the first node of supporting portable terminal radio base station of communication after moving.
Below with reference to Fig. 8, be example with portable terminal 32, illustrate when portable terminal processing procedure of agency outside the transition zone when a radio base station moves to another.
When portable terminal 32 moves to other radio base station 1i (i=2 from radio base station 15,3 or 4) time, through radio base station 1i the radio access link is reconstituted between the first node 1j (j=6 or 7) of portable terminal 32 and support radio base station 1i (S601).After having set up the radio access link, portable terminal 32 sends to first node 1j (S602) to mobile IP registration request by new radio access link.Mobile IP registration request relates to IP address and the identifier that portable terminal 32 is set.After receiving mobile IP registration request, first node 1j is forwarded to request the Section Point 18 (S603) that has the radio base station identifier that is used to specify radio base station 1i.
When receiving mobile IP registration request, Section Point 18 is linked into user data corresponding to the identifier that adds the portable terminal 32 in the request to by monitor 19, and upgrade motion/mobility data 1092 as described above, thereby the position (S604) of agent functionality outside the district of definite portable terminal 32.Then, outside the district that Section Point 18 bases are determined the position of agent functionality, the current relevance (S605) between the outer IP address of acting on behalf of in the IP address of renewal portable terminal 32 and district.After this, Section Point 18 judges once more whether the outer agency in district is positioned at (S606) in the first node 17, and according to the results operation of judging.
(S606 under the situation that motion/mobile attribute mark 1093 is " 1 " when portable terminal 32 moves to radio base station 14 from radio base station 15 and agent functionality is arranged on the first node 17 outside its district, be), Section Point 18 will specify the link ID update request of the IP address of portable terminal 32 to send to first node 17 (S607).After receiving link ID update request, first node 17 upgrades the link ID corresponding to the radio access link of the IP address of portable terminal 32, and the new radio that it is corrected with portable terminal 32 inserts linked link ID (S608).Then, first node 17 sends to portable terminal 32 (S609) through the radio access link with a register response.Therefore, portable terminal 32 with communication party 22 dialogue in move under the situation of radio base station 14 from radio base station 15, the route of the communication data packet between portable terminal 32 and the communication party 22 from through the route changing of radio base station 15 to the route of passing through radio base station 14.
When the outer agency's in the district of in step S606, judging portable terminal 32 position with in the front position when different, Section Point 18 set up act on behalf of outside the new district and district that the deletion (removing) of cooperating with radio base station and first node is old outside act on behalf of (S610).Be described in detail in the processing procedure of step S610 below.
(1) moves under the situation of the radio base station 14 that belongs to first node 17 from radio base station 15 at portable terminal 32
(A) when the outer agency in district has been arranged in the radio base station 15 of communicating by letter before wherein portable terminal 32 is moving:
(a) will distinguish outer agency is repositioned in the radio base station 14, in this case, by follow with Fig. 3 in the identical program of step S106 to S108, agent functionality outside the district of generation portable terminal 32 in radio base station 14, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the radio base station 15, therefore, for example, when portable terminal 32 with communication party 22 dialogue the time when radio base station 15 moves to radio base station 14, the route of the communication information newspaper between portable terminal 32 and the communication party 22 from through the route of radio base station 15 (portable terminal 32 ← → radio base station 15 ← → Section Point 18) change to the route of passing through radio base station 14 (portable terminal 32 ← → radio base station 14 ← → Section Point 18); Or
(b) will distinguish outer agency is repositioned in the first node 17, in this case, by following the identical program of step S206 to S208 among Fig. 4, agent functionality outside the district of generation portable terminal 32 in first node 17, and delete agent functionality outside the district that is arranged in the portable terminal 32 in the radio base station 15, therefore, for example, when portable terminal 32 with communication party's 22 dialogues the time when radio base station 15 moves to radio base station 14, the route of the communication information newspaper between portable terminal 32 and the communication party 22 from through the route of radio base station 15 (portable terminal 32 ← → radio base station 15 ← → Section Point 18) change to process radio base station 14 and first node 17 route (portable terminal 32 ← → radio base station 14 ← → first node 17 ← → Section Point 18).
(B) be arranged under the situation in the first node 17 as agency outside the district:
(a) will distinguish outer agency is repositioned in the radio base station 14, in this case, by following the identical program of step S106 to S108 among Fig. 3, agent functionality outside the district of generation portable terminal 32 in radio base station 14, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the first node 17, therefore, for example, when portable terminal 32 when communicating by letter with communication party 22 when radio base station 15 moves to radio base station 14, the route of the communication data packet between portable terminal 32 and the communication party 22 from through the route of radio base station 15 and first node 17 (portable terminal 32 ← → radio base station 15 ← → first node 17 ← → Section Point 18) change to route through radio base station 14 (portable terminal 32 ← → radio base station 14 ← → Section Point 18).
(2) move to from radio base station 15 under the situation of another radio base station (for example, radio base station 13) that belongs to first node 16 at portable terminal 32
(A) when outer agency is arranged in the radio base station of communicating by letter before wherein portable terminal 32 is moving the district:
(a) again the outer agency in district is positioned in the radio base station 13, in this case, by following the identical program of step S106 to S108 among Fig. 3, agent functionality outside the district of generation portable terminal 32 in radio base station 13, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the radio base station 15, therefore, for example, when portable terminal with communication party 22 dialogue the time when radio base station 15 moves to radio base station 13, the route of the communication data packet between portable terminal 32 and the communication party 22 from through the route of radio base station 15 (portable terminal 32 ← → radio base station 15 ← → Section Point 18) change to the route of passing through radio base station 13 (portable terminal 32 ← → radio base station 13 ← → Section Point 18); Or
(b) will distinguish in the first node 16 that outer agency is repositioned at the radio base station 13 of supporting that portable terminal 32 is wherein communicated by letter after moving, in this case, by following the identical program of step S206 to S208 among Fig. 4, agent functionality outside the district of generation portable terminal 32 in first node 16, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the radio base station 15, therefore, for example, when portable terminal 32 with communication party 22 dialogue the time when radio base station 15 moves to radio base station 13, the route of the communication information newspaper between portable terminal 32 and the communication party 22 from through the route of radio base station 15 (portable terminal 32 ← → radio base station 15 ← → Section Point 18) change to the route of passing through radio base station 13 and first node 16 (portable terminal 32 ← → radio base station 13 ← → first node 16 ← → Section Point 18).
(B) when outer agency is arranged in the first node 17 of supporting the radio base station 15 of communicating by letter before wherein portable terminal is moving the district:
(a) the outer agency in district is repositioned in the radio base station 13, in this case, by following the identical program of step S106 to S108 among Fig. 3, agent functionality outside the district of generation portable terminal 32 in radio base station 13, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the first node 17, therefore, for example, when portable terminal 32 with communication party's 22 dialogues the time when radio base station 15 moves to radio base station 13, the route of the communication data packet between portable terminal 32 and the communication party 22 from through the route of base station 15 and first node 17 (portable terminal 32 ← → radio base station 15 ← → first node 17 ← → Section Point 18) change to the route of passing through radio base station 13 (portable terminal 32 ← → radio base station 13 ← → Section Point 18); Or
(b) the outer agency in district is repositioned in the first node 16 of the radio base station 13 of supporting that portable terminal 32 is wherein communicated by letter after moving, in this case, by following the identical program of step S206 to S208 among Fig. 4, agent functionality outside the district of generation portable terminal 32 in first node 16, and delete agent functionality outside the district that has been arranged in the portable terminal 32 in the first node 17, therefore, for example, in the time of portable terminal and communication party 22 dialogues when radio base station 15 moves to radio base station 13, the route of the communication data packet between portable terminal 32 and the communication party 22 from through the route of radio base station 15 and first node 17 (portable terminal 32 ← → radio base station 15 ← → first node 17 ← → Section Point 18) change to the route of passing through radio base station 13 and first node 16 (portable terminal 32 ← → radio base station 13 ← → first node 16 ← → Section Point 18).
[second embodiment]
Although a preferred embodiment of the present invention has been described, the present invention is not limited to this, but can carry out various change and modification.The following describes the second embodiment of the present invention.
Although in first embodiment, monitor the motion/mobility of portable terminal, and determine the outer agency's in district position that determining of the outer agency in district can basis: act on behalf of inversion frequency outside the district of time per unit on (1) each portable terminal according to the result who monitors; (2) model type of each portable terminal; And/or the availability/utilization of resource in the packet exchange net of (3) mobile communication, rather than motion/mobility.
Under the situation of (1), should be noted that outside the district of time per unit of each portable terminal and act on behalf of inversion frequency, rather than the motion/mobility shown in Fig. 2 1092.When frequency during, the outer agency in district is arranged in the radio base station in the zone that portable terminal moves to less than defined threshold.Otherwise, the outer agency in district is arranged in the first node of supporting the radio base station in the zone that portable terminal moves to.
Under the situation of (2), the model type of setting up portable terminal replaces the motion/mobility data 1902 shown in Fig. 2.The model type indicating mobile terminal be a PHS, cell phone, or the like.Because motion frequency can predict to a certain degree statically according to model type, thereby, for having carried out a small amount of mobile terminal style that moves, the outer agency in district is arranged in the radio base station in the zone that portable terminal moves to.Otherwise, the outer agency in district is arranged in the first node of supporting the radio base station in the zone that portable terminal moves.
Under (3) situation, with the monitor replacement monitor 19 of the use of the resource such as the path of link first node and Section Point in the monitoring data packet switching network.When mobile terminal request moves the IP registration, Section Point is found out the resource use amount (utilances of CPU, memory etc.) in the first node of supporting the radio base station in the zone that portable terminal moves and be can be used for the free frequency band in the path between first node and the Section Point from the information that monitors, if and first node has enough resources, determine distinguish outer agency so and be arranged in the first node.Otherwise, the outer agency in district is arranged in the radio base station in the zone that portable terminal moves.
In addition, in first embodiment, be that to be arranged in agency outside the district of each portable terminal in the first node or to be arranged in decision in the radio base station be to make when the position of each portable terminal of registration, and will distinguish outer agency and be arranged in definite position regularly, take place up to next location registers.But the outer agency's in district position can change before next location registers.Can be as the situation of first embodiment, the change of agent location outside the session district between portable terminal and communication party.For example, can (4) according to the availability/use of resource in the packet exchange net of mobile radio communication; And/or (5) response changes the position of acting on behalf of outside the district of each portable terminal from the delay request of user's application program of portable terminal.
Under the situation of (4), replace monitor 19 with the monitor of the use of the resource such as the path of link first node and Section Point in the monitoring data packet switching network.Section Point is found out stock number of using in the first node (utilances of CPU, memory etc.) and the free frequency band that can be used as the path between first node and the Section Point from the information that monitors, and when judging that first node does not have enough resources, part or all of the outer agent functionality in district that is arranged in the portable terminal in the first node transferred in the radio base station that portable terminal links.On the other hand, if first node has enough resources, so Section Point will be arranged in agent functionality outside the district of the portable terminal in the radio base station that belongs to first node part or all transfer to first node.
The situation of considering now that portable terminal and communication party have dialogue and moving when communicate by letter, the outer inversion frequency of acting on behalf of in district changes according to acting on behalf of to be arranged in the radio base station or to be arranged in the first node outside the district.If frequent change of the outer agency in district will be very unfavorable to the packet that sends the voice signal that allows very little delay, because this change has postponed the transmission of packet.On the other hand, when sending the packet of text or character, delay to a certain degree is no problem.Under the situation of (5), the delay request of user's application program of the position influence portable terminal of portable terminal and changing.For example, when the communication of portable terminal notice Section Point must have only that the agency has been arranged on the radio base station outside very little delay and its district, Section Point will be in the district of portable terminal outside the agency transfer to the first node of support radio base station.In contrast, when the communication of portable terminal notice Section Point allowed certain delay, if the agency has been arranged on the first node outside the district of portable terminal, Section Point was transferred to the radio base station that portable terminal uses to it so.
[the 3rd embodiment]
Figure 10 is the schematic diagram of structure that shows a system of a third embodiment in accordance with the invention.This system is the improvement system of a utilization in the past based on the system of the network of mobile IP v 6, and comprises a plurality of subnets, link 201 to 203, and they interconnect by the IP kernel heart net such as the internet.In Figure 10,, can be connected to each link 210 to 203 to more than one portable terminal although only show a portable terminal 204 and a communication party 205 for convenience of description.As for local agent, only show a local agent 206 of portable terminal 204 among the figure.The location/position of with dashed lines indication is the local position of portable terminal 204 on link 201.That is, equal portable terminal 204, link 201 is link-locals, and link 202 and 203 is the outer links in district.With reference to Figure 10, portable terminal 204 links with the outer link 203 in district.Except other portable terminal, the communication party's of portable terminal 204 example comprises the fixed terminal of personal computer and so on.In Figure 10, communication party 207 is shown as the fixed terminal of communicating by letter with portable terminal 204.Illustrate in passing, the relation in the system of Figure 10 between local agent 206 and the portable terminal 204 be equivalent to a GGSN in the 3G mobile network (Gateway GPRS Support Node) and a portable terminal between relation.
Except offering the portable terminal identical functions of utilizing mobile IP v 6, portable terminal 204 also has the function of storage and supervisory communications side tabulation, with when the link change that is connected to local agent 206 transmission connection update requests to report a function that has the new c/o address that the communication party tabulates.As shown in Figure 11, communication party's tabulation comprises each communication party's local address.
Except having the identical functions that offers the local agent that utilizes mobile IP v 6, local agent 206 also has when the connection update request that receives from portable terminal 204, sends to connect update request with the new c/o address report of portable terminal 204 function to each communication party in communication party's tabulation.
Figure 12 and 13 is precedence diagrams of the processing procedure carried out of the portable terminal, local agent and the communication party that show a third embodiment in accordance with the invention.These processing procedures are to carry out under the control by the program of computer in being stored in the memory that is included in portable terminal, local agent and the communication terminal.The operation of this embodiment is described below with reference to respective figure.
(1) outside portable terminal 204 moves to the district under the situation of link
Link 202 or 203 time when move to the district from link-local 201 outside, or outside a district link moving outside another district during link, as the portable terminal that uses mobile IP v 6, portable terminal 204 detects by a route advertisement and moves to the outer link in district, and obtains a new c/o address (S101 among Figure 12).The c/o address can dispose automatically by the total state address according to DHCP (DHCP) v6 (RFC 1971) or stateless address disposes acquisition automatically.Represent the new c/o address that portable terminal 204 obtains with X:a.The IPv6 address of one 128 bit length of X:a indication, wherein X indicates the network prefix of the new link that connects, the interface I D of a indicating mobile terminal 204.
Next, the c/o address that has communication party's tabulation as shown in Figure 11 that portable terminal 204 will obtain connects update request as one and sends to local agent 206 (S102).Figure 14 (a) shows the example of form of packet that sends to the connection update request of local agent 206 from portable terminal 204.Ipv6 header comprises as the c/o address of a source address (sa) with as the address of the local agent 206 of a destination-address (DA), and the header back attached local address and communication party's tabulation of portable terminal 204.
When the connection update request that receives from portable terminal 204, local agent 206 upgrades its connection cache memories, and the c/o address of a pair of notice of registered mobile terminal 204 and local address (S103).After this, local agent 206 will be specified the connection update request of the c/o address of being notified by portable terminal 204 to send to repeatedly and will be included in each communication party (S104) who is attached in the communication party's tabulation that connects the update request back.In an example of the tabulation of the communication party shown in Figure 11, will connect update request and send to m communication party CN1 to CNm.Figure 14 (b) shows the schematic diagram of example of form of packet that sends to communication party's connection update request from local agent 206.Ipv6 header comprises as the c/o address of the portable terminal 204 of a source address (sa) with as each communication party's of a destination-address (DA) local address, and the local address that is attached at portable terminal 204 thereafter.
Receive each its connection cache memory of communication party CN1 to CNm renewal that connects update request, and the c/o address of a pair of notice of registered mobile terminal 204 and local address (S105).
Illustrate in passing, can the connection in the mobile IP v 6 more new option as send to communication party's connection update request from local agent 206.In addition, can more realize from the connection update request of the local agent 204 of portable terminal 204 transmissions in the new option by the connection that communication party's tabulation is added to mobile IP v 6.
(2) send packet to portable terminal 204
Packet is sent under the situation of portable terminal 204 the communication party, communication party's upper-layer protocol and application program are used the address of local address as portable terminal 204.Whether there is c/o address in the connection cache memory according to the communication party, handles a packet of wherein local address of portable terminal 204 being appointed as the recipient distinctively corresponding to local address.When situation as the communication party CN1 to CNm shown in Figure 12, connect when having the c/o address of portable terminal 204 in the cache memory, immediately according to the c/o address since the direct transmission of first packet (S106).On the other hand, situation as the communication party CNn shown in Figure 12, connect when not having the c/o address of portable terminal 204 in the cache memory, send the first packet (S107 through local agent 206, S108), and when portable terminal 204 sends to communication party CNn to the connection update request of its c/o address of report (S109), communication party CNn upgrades and connects cache memory (S110), thereby begins directly to send (S111) from second packet according to the c/o address.
Next, the situation that packet is sent to portable terminal 204 with the communication party shown in Figure 10 205 illustrates two processing procedures as an example.In the following description, represent the local address of portable terminal 204, represent communication party's local address and represent the address of local agent 206 with H with Y with Xh.
(2-1) in connecting cache memory, exist under the situation of c/o address of portable terminal 204 (seeing Figure 15)
Receiving from a upper strata when wherein the local address Xh of portable terminal 204 being appointed as a recipient's packet, communication party 205 IP layer search has the connection cache memory 1051 of local address Xh, and obtains c/o address X:a ((a) among Figure 15).Next, the IP layer corrects c/o address X:a with destination-address, and the local address Xh of portable terminal 204 is set to the relay point of path control header, and sends packet ((b)).When receiving packet, portable terminal 204 is handled path control header ((c)), thereby its local address is set to a recipient.Therefore, portable terminal 204 identifies packet and is addressed to portable terminal 204, and receives packet ((d)).
(2-2) in connecting cache memory, do not exist under the situation of c/o address of portable terminal 204 (seeing Figure 16)
Receiving from a upper strata when wherein the local address Xh of portable terminal 204 being appointed as a recipient's packet, communication party 205 IP layer search has the connection cache memory 1051 ((a) among Figure 16) of local address Xh.Owing to connect the c/o address that does not have portable terminal 204 in the cache memory 1051,, and send packet ((b)) so the IP layer keeps the local address Xh that is set at a recipient.Local agent 206 is caught packet ((c)).Local agent 206 obtains the c/o address X:a of portable terminal 204 from its connection cache memory (not shown), a top that comprises the packet that adds to obtain as the address H of the local agent of a source address with as the ipv6 header (tunnel header) of the c/o address of the portable terminal 204 of a destination-address, and send packet ((d)).That is to say, packet is sent to the c/o address of portable terminal 204 by the tunnel.After packet has been deleted tunnel header ((e)), packet as a common IPv6 processing data packets ((f)).In addition, new option sends to communication party 205 ((g)) to portable terminal 204 connecting more, so that a pair of local address Xh of portable terminal 204 and c/o address X:a are registered in the connection cache memory 1051.After this, communication party 205 directly sends to packet the c/o address X:a of portable terminal 204.
(3) send packet from portable terminal 204
Packet is sent under communication party's the situation at portable terminal 204, the upper strata uses local address Xh as source address.The IP layer is stored in the source address Xh of packet in the home address address option, and source address is transformed into c/o address X:a, and sends packet.The IP layer that receives the communication party of packet carries out opposite operation.That is to say that the IP layer obtains the local address Xh of portable terminal 204 from the home address address option of packet, replace source address X:a, and packet is sent to the upper strata with local address.
(4) when turning back to link-local, portable terminal 204 (sees Figure 13)
When portable terminal 204 identifies it and used the same way as of above-mentioned (1) to turn back to link-local (S201 among Figure 13), portable terminal 204 sends to local agent 206 (S202) to the connection update request as the form shown in Figure 14 (a) that has the communication party's tabulation shown in Figure 11.Illustrate in passing, with the c/o address X:a among local address Xh replacement Figure 14 (a).In addition, portable terminal 204 is multi-cast to all nodes in the local address with unsolicited neighbours' advertisement, so that receive the packet (S203) of the local address Xh that sends to it.
Receive the connection update request from the portable terminal 204 that turns back to link-local after, local agent 206 upgrades its connection cache memories, and registered mobile terminal 204 exists in (S204) in the link-local.Next, local agent 206 sends the connection update request shown in Figure 14 (b) repeatedly, reports to each communication party (S205) who is included in the communication party's tabulation that is attached on the connection update request portable terminal 204 has been turned back to link-local.Illustrate in passing, use local address Xh to replace c/o address X:a among Figure 14 (b).After this, local agent 206 stops packet capture and packet forwarding service.
A pair of c/o address and the local address (S206) of from its connection cache memory, deleting portable terminal 204 from each communication party CN1 to CNm of the connection update request of local agent 206 have been received.After this, when it was sent packet, communication party CN1 to CNm directly sent to packet the local address (S207) of portable terminal 204.
As mentioned above, a third embodiment in accordance with the invention when the connection link change of portable terminal 204, is given a plurality of communication parties with the nearest c/o address notification of portable terminal 204.Next, the communication party who has received the c/o address notification can directly send to packet the c/o address of portable terminal 204 immediately since first packet.Thereby, can reduce owing to send the overhead that causes by local agent.In addition, even be arranged under the situation of the portable terminal transmission packet in the same node to same portable terminal or a plurality of its local agent suddenly, can prevent that also load centralization is on local agent or interdependent node many communication parties.As for the processing procedure in the portable terminal 204, only need portable terminal 204 that the connection update request that has communication party's tabulation is sent to local agent 206, and trust 206 connections of local agent update request send to each communication party in communication party's tabulation.Therefore, can reduce load on the portable terminal 204.
Next, illustrate that store/manage is provided to the function of communication party's tabulation of portable terminal 204.If there is no relevantly be used for the memory span of storing communication side's tabulation and the restriction that sends the communications cost aspect of tabulation, can keep so portable terminal 204 to its send/receive all communication parties' of packet tabulation from it.But, to illustrate that below one is provided with the upper limit (n) to communication party's quantity in the tabulation, be stored in managing mobile terminal 204 the most frequent to/from the example of the situation of n communication party's of its transmission/reception packet tabulation.
Figure 17 is the block diagram that shows the communication party list storage/management organization that offers portable terminal 204.Communication party list storage/management organization comprises contingency table 301, and communication count refresh circuit 302 is replaced candidate and determined circuit 303, access control circuit 304 and update instruction circuit 305.
Contingency table 301 is the complete association memories with n+m clauses and subclauses, and wherein continuous n clauses and subclauses constitute extraction unit branch memory 306 that links, and m remaining clauses and subclauses have constituted a cyclic part associative storage 307.In last result, link communication party's the tabulation of the normal open letter of n of memory 306 storages of extraction unit branch.Cyclic part associative storage 307 is used for communication party's the tabulation that the communication party of the normal open letter of n is not listed in interim storage in.
Each clauses and subclauses of contingency table 301 are made of an associative key part 308 and a data part 309, and data division 309 further is divided into a communication count part 310 and an order/LRU message part 311.Associative key part 308 has the record of communication party's local address, and communication count part 310 has the record of amount of communications, and the link order/LRU message part 311 of memory 306 of extraction unit branch has the record of order information.That is to say that each clauses and subclauses that the extraction unit branch links in the memory 306 are according to the order information that is registered in the order/LRU message part 311, list according to the communication count sequential logic shown in Figure 18.Illustrate in passing that in Figure 18, numeral 401 represent a pointer that is used for indicating the clauses and subclauses (minimal communications is counted clauses and subclauses 400) that have n clauses and subclauses minimal communications and count, and be provided at replacement candidates person and determine in the circuit 303.
In addition, the order of cyclic part associative storage 307/LRU message part 311 has the LRU recording of information, and replaces recently the seldom clauses and subclauses of reference according to lru algorithm (seldom using algorithm recently).That is, m clauses and subclauses in the cyclic part associative storage 307 are to list according to the nearest reference sequence logic shown in Figure 18.The replacement candidate of pointer 403 that has the clauses and subclauses 402 of an indication seldom reference is recently determined circuit 303 according to the LRU rule, the clauses and subclauses of using pointer 403 decisions to remove from cyclic part associative storage 307.
Update instruction circuit 305 is connected with MPU (not shown) in being included in portable terminal 204 through a update instruction bus 312.When the communication application program carried out on the MPU through update instruction bus 312 with portable terminal 204 to/when its local address that has sent/received a communication party of packet is notified to update instruction circuit 305, update instruction circuit 305 outputs to an address wire 313 with local address, and it is sent to communication count refresh circuit 302.The associative key part 308 of each clauses and subclauses in address wire 313 and the contingency table 301 is connected.A comparator in each associative key part 308 compares the local address and the local address on the address wire 313 of registration in the associative key part 308, and by each comparative result line 314 comparative result is sent to communication count refresh circuit 302.
Communication count refresh circuit 302 is circuit that are used for upgrading the communication count part 310 of contingency table 301 each clauses and subclauses.When mating between two local addresss having reported clauses and subclauses by comparative result line 314, communication count refresh circuit 302 upgrades clauses and subclauses by its communication count is increased progressively 1.After this, communication count refresh circuit 302 is specified the clauses and subclauses of upgrading, and startup replacement candidate is determined circuit 303.When line 314 is reported the coupling of any clauses and subclauses as a result without comparison, promptly, when the local address that outputs to address wire 313 is not registered in the contingency table 301,302 requests of communication count refresh circuit are replaced candidate and are determined that circuit 303 is retained in clauses and subclauses in the cyclic part associative storage 307, and the communication count of the clauses and subclauses that keep is initialised to 1.
After being started, replace candidate and determine circuit 303 following operations by communication count refresh circuit 302.
(1) under the situation of clauses and subclauses in the extraction unit branch links memory 306 of upgrading, as the front illustrates in conjunction with Figure 18, replace candidate and determine that circuit 303 upgrades the order information that is registered in the order/LRU message part 311, and if necessary, upgrade pointer 401, thus make the extraction unit branch link in the memory 307 n clauses and subclauses can according to the sequential logic of communication count list.
(2) under the situation of clauses and subclauses in cyclic part associative storage 307 of upgrading, replace candidate and determine that circuit 303 is with the link communication count comparison of clauses and subclauses 400 of pointer 401 indications shown in Figure 18 in the memory 306 of the communication count of clauses and subclauses and extraction unit branch, and when the communication count of the clauses and subclauses of upgrading is higher than the communication count of clauses and subclauses 400, with the link content of the clauses and subclauses 400 in the memory 306 of the content replacement extraction unit branch of the clauses and subclauses of upgrading.
On the other hand, keep under the situation of request when receive clauses and subclauses from communication count refresh circuit 302, replace the clauses and subclauses 402 that candidate determines to remove in m the clauses and subclauses of circuit 303 decisions from cyclic part associative storage 307 pointer 403 indications shown in Figure 18.In addition, replace candidate and determine that circuit 303 is registered in local address in the associative key part 308 of clauses and subclauses 402 by an associative key update instruction line 315, and the information of relevant clauses and subclauses 402 is notified to communication count refresh circuit 302.
Access control circuit 304 inserts bus 316 through one and is connected to MPU, and also be connected to extraction unit branch in the contingency table 301 memory 306 that links through the tie-in line 317 that comprises a data wire and address wire, so that according to the address that MPU provides, the memory 306 that links of the extraction unit branch from contingency table 301 is read the content of each clauses and subclauses.In content, n the local address that is registered in the associative key part 308 formed portable terminal n communication party's of communication tabulation the most with it.
Above in conjunction with Figure 17, as an example illustrated storage and managing mobile terminal the most continually to/from the situation of n communication party's of its transmission/reception packet tabulation.But, communication application program can only receive the communication party's of packet local address update notifications instruction circuit 305 to portable terminal 204 from it through update instruction bus 312, and do not report that portable terminal 204 sends the communication party's of packet local address to it, thereby can store the tabulation that receives n communication party of packet with managing mobile terminal the most continually from it.
Although above-mentioned communication party list storage/management organization is with hard-wired,, it also can be realized with software.In this case, portable terminal with a procedure stores that is assigned to this mechanism in its memory.The computer that constitutes portable terminal reads the program that is stored in the memory, and realizes determining corresponding to contingency table 301, communication count refresh circuit 302, replacement candidate the function of circuit 303, access control circuit 304 and update instruction circuit 305 on computers.
Although in the above-described embodiments, the present invention is applied to the network that uses mobile IP v 6,, the present invention also can be applied to and use the mobile IPv 4 network.In this occasion, when portable terminal moves to another will connect link the time, it a new c/o address and communication party's tabulation by the outer agent advertisement in district to local agent.Then, local agent can be a pair of local address c/o address notification of portable terminal to each communication party in communication party's tabulation, each communication party during perhaps the outer agency in district can tabulate a pair of local address of portable terminal and c/o address notification to the communication party, and the situation of the moving IPv6 of image drift is the same, this a pair of local agent that is notified to.Each communication party this of portable terminal in its memory of local address and c/o address storage, and when to portable terminal transmission packet, according to the local address searching storage, to find the c/o address.If there is relevant c/o address, the communication party directly sends to the c/o address to packet so.
In addition, in the foregoing description, agency by agreement reports to each communication party in communication party's tabulation with portable terminal a pair of nearest c/o address and local address.But report can be undertaken by portable terminal oneself.
Industrial applicibility
As mentioned above, according to the present invention, can prevent that load centralization is on the node as agency outside the district of portable terminal. This is because agent functionality outside a plurality of portable terminals district is distributed to first node and belongs to each radio base station of first node.
In addition, according to the present invention, can limiting mobile terminal and its communication party between Packet Generation and receive delay. This is owing to act on behalf of when being arranged in the radio base station outside the district of portable terminal, can disturb the first node ground bag that transmits and receive data.
As mentioned above, according to the present invention, can directly send from the communication party and be addressed to portable terminal first packet. This be because, when the subnet that connects changes, notify a pair of nearest c/o address of portable terminal and local address to specific quantity, for example, the most continually with the communication party of communication of mobile terminal, thereby make the communication party immediately since first packet, directly arrive the c/o address to Packet Generation.
In addition, according to the present invention, can reduce in advance will be the c/o address notification to the load on a plurality of communication parties' the portable terminal. This is to send to the agency because portable terminal will be attached with the connection update request of communication party's tabulation, thereby the agency can carry out the transmission to each communication party's connection update request in communication party's tabulation of portable terminal.

Claims (6)

1. the mobile terminal management system in the network, described network comprises a plurality of interconnective subnets, in mobile terminal management system, each portable terminal has the Care-of Address and the local address that has nothing to do with subnet that depend on the subnet of the current connection of this portable terminal, wherein, when the subnet that is connected to each portable terminal changes, the a pair of nearest Care-of Address and the local address of portable terminal are notified to a plurality of communication parties, wherein, portable terminal has: be used to store the device of tabulating with supervisory communications side; Be used for when the subnet that connects changes, send the connection update request, have the device of the new Care-of Address of communication party's tabulation with report; Be used for receive connecting update request, and will nearest Care-of Address and local address to be notified to the communication party tabulate in each communication party's agent apparatus among a plurality of communication parties, wherein
Be used to store and comprise with the device of supervisory communications side's tabulation and to be used for by monitoring that communicating by letter on the portable terminal set up communication party's the device of tabulation of the most frequent communication of fixed qty.
2. mobile terminal management system according to claim 1, wherein network is a network based on mobile IP v 6, and agent apparatus is the home agent apparatus of portable terminal.
3. mobile terminal management system according to claim 1, wherein network is a network based on mobile IPv 4, and agent apparatus is the home agent apparatus of portable terminal.
4. mobile terminal management system according to claim 1, wherein network is a network based on mobile IPv 4, and agent apparatus is an agent apparatus outside the district of portable terminal.
Care-of Address with the subnet that depends on the current connection of portable terminal and with the portable terminal of the irrelevant local address of subnet, comprise the device that is used to store with the tabulation of supervisory communications side; Be used for when the subnet that connects changes, send the connection update request, have the device of the new Care-of Address of communication party's tabulation with report; Be used for receive connecting update request, and will nearest Care-of Address and local address to be notified to the communication party tabulate in each communication party's agent apparatus among a plurality of communication parties, wherein
Be used to store and comprise with the device of supervisory communications side's tabulation and to be used for by monitoring that communicating by letter on the portable terminal set up communication party's the device of tabulation of the most frequent communication of fixed qty.
6. the agent apparatus of the portable terminal in the network, described network comprises a plurality of interconnective subnets, wherein each portable terminal has the Care-of Address of the subnet that depends on the current connection of this portable terminal and the local address that has nothing to do with subnet, described agent apparatus comprises: be used for receiving when the subnet that is connected to portable terminal changes the device from the connection update request of each portable terminal, with the device of each communication party among a plurality of communication parties of communication party's tabulation that a pair of nearest Care-of Address and the local address that are used for relevant portable terminal are notified to the connection update request that is attached to reception, a plurality of communication parties in wherein said communication party's tabulation are communication parties of the most frequent communication of definite fixed qty by monitoring communication on the portable terminal.
CN2005101185415A 2001-03-14 2002-03-12 Mobile terminal management system, mobile terminal, agent, and program Expired - Fee Related CN1770780B (en)

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JP2001071882A JP3555587B2 (en) 2001-03-14 2001-03-14 Mobile terminal management system
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