JP4237134B2 - Network, network system and network system communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a network system which can reduce power consumption, effectively utilize frequencies, and is applicable to even mobile objects. <P>SOLUTION: Each of wireless terminals 101 includes a terminal address storage means for storing a terminal address of a predetermined transmission destination, in the case of transmitting a message from a wireless terminal to another terminal, when receiving a wireless frame from the wireless terminal, GW nodes 102 to 105 access the terminal address storage means, particularize the terminal address of the transmission destination of the message by each wireless terminal, transmit the message to the terminal of the particularized transmission destination via an Internet GW 113, and in the case of transmitting the message from the terminal to the wireless terminal, the Internet GW 113 accesses a positional information storage device, acquires positional information of the wireless terminal on the basis of the ID of the wireless terminal, transfers the message to the corresponding GW node on the basis of the acquired positional information, and the GW node transfers the message to the wireless terminal. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a technique for efficiently communicating object objectives, and specifically to a wide area m2m network.

There are attempts to apply communication means not only for person-to-person but also for object objectives. This is called machine-to-machine, abbreviated m2m communication, and the network is called m2m network.
Specific examples of m2m communication include: (1) The vending machine automatically reports the inventory status of its built-in products to the inventory management device, (2) Transports the operation status (location, speed, etc.) of the truck Automatically report to the company's operation management system.

As a network mainly used in m2m communication, there are a mobile phone and a PHS (registered trademark). A mobile phone transmission / reception device or a PHS (registered trademark) transmission / reception device is attached to an object (for example, a vending machine), and the transmission / reception device calls and communicates with a communication partner. (Cell phones may be in packet switching mode instead of circuit switching mode.)
As an existing network mainly used in m2m communication, a basic configuration of a PDC (second generation mobile phone) network (circuit switching mode) is shown in FIG. 8 (see Non-Patent Document 1).

  The network is composed of two levels, a mobile gateway relay level and a mobile subscriber level, and a home location register (HLR) is provided as a location registration database. As basic components, it has an interconnection function with other networks, an automatic tracking connection function for incoming calls, and a relay gateway mobile communication control station (MGC: Mobile Gateway Center), presence management and subscriber connection functions Subscriber mobile communication control station (MCC: Mobile Control Center), HLR in which subscriber information such as mobile terminal number and area of service is registered, base station (BS: Base Station) and mobile terminal (mobile device) ( MS: Mobile Station). Here, base station control functions (assignment of radio channels to mobile terminals, execution of switching control, etc.) are built in the MCC.

The outline of the procedure of (1) location registration, (2) outgoing call processing, and (3) incoming call processing, which are basic operations of the mobile communication network, will be described below.
(1) Location Registration In the mobile communication system using the cell system, since the mobile terminal itself moves spatially, it is necessary to keep track of its location on the network side. For this purpose, location registration is essential.

  As for the position of the mobile terminal, the PA is held in the HLR for each terminal in a paging area (PA) unit. Paging means wireless calling and is called a paging area because when an incoming call arrives at a mobile terminal, it is called all at once in the area. The basic process of location registration is as follows.

(i) In the mobile communication network, the PA number of the location is transmitted from the base station using a broadcast channel that can be received by all mobile terminals. The mobile terminal receives the PA number and stores it inside.
(ii) When a change in the PA number received by the mobile terminal after moving is detected, location registration is performed. The mobile terminal transmits a location registration request to the HLR, and the HLR rewrites the location information.
(iii) When the location registration is completed, a location registration completion signal is transmitted from the HLR to the mobile terminal.

(2) Outgoing process An outline of a basic connection procedure when making a call from a mobile terminal is shown below.
(i) The transmission terminal requests the BS to set a signal channel for transferring a call setting signal, and the BS sets the signal channel.
(ii) Dial the destination telephone number from the calling terminal and send a call setup request including the telephone number to the MCC via the BS. The MCC authenticates the terminal based on the subscriber information stored in the HLR.

(iii) The MCC instructs the BS to allocate a voice channel for a call to the calling terminal.
(iv) The MCC issues a call setup request to the MGC. If the destination is a fixed network or a mobile terminal of another operator, the MGC routes the call there. On the other hand, if the destination is a mobile terminal of a subscriber of his network, the location information is inquired of the HLR.
(V) When the connection destination is a mobile terminal, a call setup signal is routed based on the location information, and a simultaneous call is made from the BS in the paging area to which the receiving terminal belongs. When the destination that is the connection target responds, the connection is established and a call can be made.

(3) Incoming call processing An outline of a connection procedure when a mobile terminal receives an incoming call is shown.
(i) An incoming request (call setting request) from a fixed network or another cellular network is first delivered to the MGC, including the destination telephone number.
(ii) The MGC routes the call to the MCC to which the receiving terminal belongs. For this reason, the HLR checks in which MCC cover range the destination mobile terminal is located from the held terminal location information. Based on information from the HLR, the MCC makes a simultaneous call through the BS of the corresponding paging area.

(iii) The mobile terminal that has received the paging signal requests the BS to set a signal channel for transferring a call setting signal, and the BS sets the signal channel.
(iv) The MCC authenticates the receiving terminal based on the subscriber information stored in the HLR, sends a call setup request signal to the receiving terminal, and instructs the BS to assign a voice channel for calling to the terminal. Put out.
(V) When the receiving terminal rings and the called party answers, a connection is established and a call can be made.

In the circuit switching method, the wireless line is monopolized even when information is not actually flowing, so in the case of data communication where the actual data transmission time is shorter than the overall communication time, the efficiency of using the wireless line is Extremely worse.
On the other hand, in the packet switching method, since it is possible to wait for each packet, a wireless line can be shared by a plurality of communications, and the use efficiency can be increased also in data communications.

  A typical PDC-P (Packet) network configuration as a wireless packet system is shown in FIG. A packet gateway relay processing device (PGW: Packet Gateway Module) is a device for interconnecting with other networks such as the Internet and corporate networks. When a user packet arrives from another network, the mobile communication service control device (M-SCP) : Mobile-Service Control Point) location information, and has a function of routing to a packet subscriber processing device (PPM: Packet Processing Module) that manages the area where the mobile terminal exists.

The PPM is opposed to the mobile terminal via the base station, transmits / receives user packets, and has functions such as assembly / disassembly of packets in the wireless section, authentication, secrecy, and accounting.
In addition, in order to enable i-mode communication, a mobile message packet gateway device (M-PGW: Mobile Message-) that terminates the communication protocol with the mobile terminal and the server and connects them to each other. PGW) is arranged.
On the other hand, the i-mode server has a gateway function that connects the PDC-P network and the Internet. Specifically, it has an information distribution function, a mail transmission / reception function, a storage function, an information provider management function, and an information fee billing function.

The IP address of the user IP packet is associated with the telephone number of the mobile terminal by the PGW having a gateway function, and accesses to the M-SCP to acquire the location information of the mobile terminal and the connection processing is performed using it. If the position of the mobile terminal changes due to movement, the movement is controlled by re-tunneling the route.
As an example of m2m communication by a low-function terminal with short-range wireless, the m2m communication by a mobile phone is mainly in a wide area and outdoors, but the wireless tag (RFID) network proposed by Auto-ID A configuration example is shown in FIG.

  In the Auto-ID center concept, RFID functions are limited to significantly reduce the cost of tags (the target is 5 cents per item), aiming to give RFID to every product. The RFID itself is read-only and stores only a 96-bit ID (Electronic Product Code: ePC) including a serial number that enables individual identification. For example, a resolve function that commonly reads an ID (ePC) from an RFID attached to each individual through an RFID reader installed at a merchandise delivery destination and resolves the address of a database that stores data about each individual having the ID By (common resolver), the application program specifies the target database.

Then, data about each individual product with the ID read by the RFID reader is obtained from the database, or new data about the individual with the read ID is written into the database (for example, delivery date, Delivery location).
Isao Miyake and Hiroshi Saito “Ubiquitous Service Network Technology” The Telecommunications Association September 1, 2003, first edition, p. 76-80

In order to expand the scope of m2m communication from electrical appliances to general objects,
1) Because commercial power is not available, low power consumption is necessary.
2) There are many targets of m2m communication, and effective use of frequency is necessary from the viewpoint of low power consumption.
3) It must be applicable to moving objects.
4) It is necessary to be able to receive messages such as control instructions.
5) There is a problem that it is necessary to delete heavy protocols and heavy network addresses as much as possible as data load.

  The present invention has been made in view of such circumstances, and can reduce power consumption, enable effective use of frequencies, and can also be applied to moving articles, such as control instructions on the wireless terminal side. An object of the present invention is to provide a communication method for a network, a network system, and a sleeping system that can receive a message and does not require a protocol or a network address with a heavy data load.

In order to achieve the above object, a first aspect of the present invention provides a mobile comprising a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, and a position information storage device that holds position information of the wireless terminal. A network system in which a body communication network and another network to which a terminal that is a message transmission destination from the wireless terminal is connected are connected via a gateway;
The network system includes a terminal address holding unit that holds an address of the terminal that is a transmission destination predetermined for each wireless terminal;
When sending a message from the wireless terminal to the terminal,
When the gateway node receives a radio frame from the radio terminal, the gateway node accesses the terminal address holding unit, specifies a terminal address of a message destination for each radio terminal, and sends the message to the specified destination terminal. Send a message through the gateway,
When sending a message from the terminal to the wireless terminal,
The gateway accesses the location information storage device, acquires location information from the ID of the wireless terminal, transfers a message from the obtained location information to a corresponding gateway node,
The gateway node transfers the message to the wireless terminal.

The invention according to claim 2 is a mobile communication network including a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, and a position information storage device that holds position information of the wireless terminal; A network system in which a terminal that is a message transmission destination from the wireless terminal is connected to another network connected via a gateway,
The terminal creates a transmission message that specifies the wireless terminal of the transmission destination by ID, sends the transmission message to the gateway,
The gateway receives the transmission message, accesses the position information storage device, acquires position information from the ID of the wireless terminal, and puts the transmission message from the acquired position information to a corresponding gateway node As well as
The gateway node transfers the transmission message to the wireless terminal.

According to a third aspect of the present invention, a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, a position information storage device that holds position information of the wireless terminal, and a predetermined value for each wireless terminal are predetermined. A mobile communication network having a registration management device that holds the address of the terminal that is a destination, and another network to which a terminal that is a message destination from the wireless terminal is connected via a gateway A network system comprising:
The gateway node has a terminal address holding means for holding a terminal address of a wireless terminal presumed to exist in the wireless area of the gateway node and a destination terminal predetermined for each wireless terminal;
The gateway node accesses the terminal address holding means in the gateway node or the registration management device, specifies a destination terminal address of information for each wireless terminal, and addresses the end of the specified destination. A message is transmitted.

  According to a fourth aspect of the present invention, in the network system according to the third aspect, the terminal address holding means in the gateway node is presumed to exist in a wireless area of the gateway node and its advance. And holding information on a predetermined transmission destination terminal address.

  The invention according to claim 5 is the network system according to claim 3, wherein the terminal address holding means in the gateway node is presumed to exist in a wireless area of the gateway node and its advance. A predetermined transmission destination terminal address and reference time information are held.

  The invention according to claim 6 is the network system according to any one of claims 3 to 5, wherein the terminal address holding means estimates the wireless terminal that is estimated to exist in the wireless area of the gateway node. The estimation is based on the fact that the wireless terminal has recently transmitted from the gateway node.

The invention according to claim 7 is the network system according to any one of claims 1, 2, 4, and 6,
A plurality of the location information storage devices are provided,
A wireless terminal is stored in a distributed manner in a plurality of position information storage devices in units of wireless terminal ID, and has storage means for storing the distribution method.
Or
It has an address resolution node having a known address in advance, and the address resolution node has address holding means for holding the address of the corresponding location information storage device for each wireless terminal ID.

The invention according to claim 8 is the network system according to any one of claims 3 to 6,
A plurality of the registration management devices are provided,
A wireless terminal is distributed and stored in a plurality of registration management devices in units of wireless terminal ID, and has means for storing the distribution method.
Or
It has an address resolution node having a known address in advance, and the address resolution node has address holding means for holding the address of the corresponding registration management device for each wireless terminal ID.

The invention according to claim 9 is an IP network having a gateway node and a terminal, and the gateway node can wirelessly communicate with a wireless terminal which is a non-IP terminal,
It means for installing a Home Agent (HA) for each of the wireless terminal,
Terminal address holding means for holding the address of the terminal which is a predetermined transmission destination for each wireless terminal;
When sending a message from the wireless terminal to the terminal,
When the gateway node receives a radio frame from the radio terminal, the gateway node accesses the terminal address holding unit, specifies a terminal address of a message destination for each radio terminal, and sends a message to the specified destination terminal Send
The terminal has a function of creating a message addressed to the wireless terminal and transmitting the message in an IP packet;
The wireless terminal or gateway node has a function of notifying the corresponding HA of an FA address that identifies a Foreign Agent (FA) in a gateway node that has the wireless terminal under control,
When the terminal transmits an IP packet addressed to the wireless terminal to the HA, the HA forwards the received IP packet to the FA, and the FA transmits a message included in the IP packet to the corresponding wireless terminal. It is characterized by that.

The invention according to claim 10 is predetermined for each wireless terminal, a gateway node capable of wireless communication with the wireless terminal, a position information storage device that stores position information of the wireless terminal, and the wireless terminal. A mobile communication network having terminal address holding means for holding the address of the terminal that is a transmission destination and another network to which a terminal that is a message transmission destination from the wireless terminal is connected are connected via a gateway. A network system communication method comprising:
When sending a message from the wireless terminal to the terminal,
By the gateway node,
Receiving a radio frame from the radio terminal;
Accessing the terminal address holding means to identify a terminal address of a message destination for each wireless terminal;
Sending a message to the identified destination terminal via the gateway,
When sending a message from the terminal to the wireless terminal,
By the gateway
Accessing the location information storage device and obtaining location information from the ID of the wireless terminal;
Transferring a message from the acquired location information to a corresponding gateway node;
By the gateway node
Transferring the message to the wireless terminal;
It is characterized by having.

As described above, according to the present invention, since the communication partner is a fixed partner, the communication procedure can be simplified and the power consumption can be reduced.
In addition, it is not necessary to transmit information such as the address of the other party in the wireless section, so that the power consumption of the wireless terminal can be reduced and the frequency can be used effectively.
Since it has a location registration function, it can be applied to moving articles, and furthermore, a wireless terminal can receive a message even though it has only an ID.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
FIG. 1 shows the configuration of a network system according to an embodiment of the present invention. In the figure, a network system according to an embodiment of the present invention includes a wireless terminal 101, gateway nodes (hereinafter referred to as GW nodes) 102 to 105 capable of wireless communication with the wireless terminal 101, and the wireless terminal 101. A mobile communication network having a location registration database 109 that holds location information and personal computers (hereinafter referred to as PCs) 111 and 112 as terminals that are message transmission destinations from the wireless terminal 101 are connected to the Internet. 110 is a network system connected via an Internet gateway (hereinafter referred to as Internet GW) 113.

In addition, the network system includes relay nodes 106 and 107 and a registration management system 108 that holds the address of the PC 101 as a terminal that is a transmission destination determined in advance for each wireless terminal 101.
Communication between the wireless terminal 101 and the PC 111 or PC 112 as a terminal is roughly performed as follows.
When transmitting a message from the wireless terminal 101 to the PC 111 or the PC 112, when any of the GW nodes 102 to 105 receives a wireless frame from the wireless terminal 101, the GW nodes 102 to 105 access the registration management system 108 for each wireless terminal. The terminal address of the message destination is specified, and the message is transmitted to the PC 111 or the PC 112 which is the specified destination terminal via the Internet GW 113.

  Further, when a message is transmitted from the PC 111 or the PC 112 to the wireless terminal 101, the Internet GW 113 accesses the location registration database 109, acquires location information from the ID of the wireless terminal 101, and applies the corresponding location information from the acquired location information. The gateway node transfers the message to the wireless terminal.

  Here, the location registration database 109 is the location information storage device of the present invention, the registration management system 108 is the terminal address holding means of the present invention, the PCs 111 and 112 are the terminals of the present invention, and the Internet GW 113 is the gateway of the present invention. In addition, the Internet 110 corresponds to another network of the present invention.

  The wireless terminal 101 is a wireless terminal mounted on an object and can perform wireless communication with the GW nodes 102 to 105. The GW nodes 102 to 105, the registration management system 108, and the location registration database 109 are connected to each other via the relay nodes 106 and 107, and can communicate with each other. The wireless terminal 101, the GW nodes 102 to 105, the registration management system 108, the location registration database 109, and the relay nodes 106 and 107 constitute a mobile communication network.

The mobile communication network is also connected to the Internet 110 via the Internet GW 113 and can communicate with personal computers (PCs) 111 and 112 connected to the Internet 110.
In the present embodiment, the GW nodes 102 to 105, the relay nodes 106 and 107, and the Internet GW 113 all have IP addresses and can communicate with the PCs 111 and 112 via the Internet 110.

The wireless terminal 101 determines the message transmission destination in advance and registers it in the registration management system 108. The registration management system 108 stores a set of {wireless terminal ID, partner address} shown in FIG. In this embodiment, the transmission destination of the wireless terminal 101 is assumed to be the PC 111 as an example.
The wireless terminal 101 is mounted on a moving object, and position registration is required when moving.

  Each of the GW nodes 102 to 105 wirelessly broadcasts the paging area number, and the wireless terminal 101 receives a number different from the paging area number held by itself and recognizes the change of the area in which it is located. When the service area changes, the wireless terminal 101 (1) updates the paging area number held by itself, and (2) the paging area number (service area) that the user has visited via the GW node / relay node. Number) is notified to the location registration database 109. The location registration database 109 stores a set of {wireless terminal ID, presence area number} shown in FIG. 3 as location information.

  A flow of information transmission from the wireless terminal 101 is shown in FIG. When the wireless terminal 101 satisfies a predetermined activation condition (for example, when the temperature sensed at a certain time exceeds a certain value) (step 201), the wireless terminal 101 The own ID and sensing information are put in a radio frame as a message and transmitted (step 202).

  The GW nodes 102 to 105 hold a set (referred to as a resident terminal list) of an ID of a wireless terminal that is estimated to be in the area, its destination address, and a reference time (FIG. 4). The GW nodes 102 to 105 receive the wireless frame (step 203), and check whether the wireless terminal ID in the received message is in the visited terminal list (step 204). If not, the registration management system 108 is accessed (step 205), and the destination address for the wireless terminal ID is inquired (206). (If there is no corresponding terminal even if the inquiry is made, it is an unauthorized terminal and the received message is discarded.)

Then, using the current time as a reference time, a pair of partner addresses obtained by referring to the wireless terminal ID is added to the in-zone terminal list (step 207). (Thus, when there is no area change, the destination address can be grasped without referring to the registration management system 108.)
If originally present in the in-zone terminal list, the reference time is updated to the current time and held (step 208).

The destination address thus obtained is set as the destination address, the source address is set as the GW node address, and the message is sent to the destination by the TCP / IP packet in the payload. At this time, the message is held (step 209).
The PC that has received the TCP / IP packet extracts the message and returns an ACK to the GW node (step 210). The GW node that has received the ACK specifies the corresponding retained message from the IP address and deletes it (step 211).

Further, when the reference time of the in-zone terminal list becomes older than the time point that is predetermined time-out from the current time, the {set of the wireless terminal ID and its destination address, reference time} is deleted ( Steps 212, 213).
The wireless terminal 101 can receive a message from a predetermined PC 111 and an arbitrary PC 112. The PCs 111 and 112 transmit the communication message to the Internet GW 113 via the Internet 110 in a TCP / IP packet with the originating address as its own address and the destination address as the Internet GW 113 address.

  At the beginning of the communication message, the own address is entered as the source address, the ID of the wireless terminal 101 is entered as the destination address, and the message to be transmitted is entered thereafter. The Internet GW 113 that has received the packet extracts the message and recognizes that the communication is for the wireless terminal 101. Then, the location registration database 109 is accessed, and the located area number is acquired from the wireless terminal ID. The internet GW 113 obtains the address of the GW node in which the wireless terminal 101 is located by drawing an address table (FIG. 5) of the GW node corresponding to the area in which it is held.

Then, the extracted message is transmitted in a TCP / IP packet in which the source address is the own address and the destination address is the address of the GW node in which the wireless terminal 101 is located. The GW node that has received the TCP / IP packet extracts a message from the packet and recognizes that the communication is for the wireless terminal 101. Then, the same message is transmitted to the wireless terminal 101 through the wireless channel.
When the communication source is only the PC 111 determined in advance, the source address area of the message can be deleted.

In the above embodiment, the registration management system 108 and the location registration database 109 are described as one by one. If there are a plurality of them, they are distributed by the following two methods.
1) Distribute these systems according to wireless terminal IDs. Specifically, the wireless terminal ID is less than 10000 and is divided into two, and the GW node or the like knows the distribution method in advance and changes the access destination according to the wireless terminal.
2) Prepare an address resolution node having a known address in advance. This address resolution node holds the address of the corresponding registration management system and location registration database for each wireless terminal ID. The GW node or the like accesses the address resolution node, obtains an address of a desired registration management system and location registration database from the wireless terminal ID, and accesses the address resolution node.

In the above embodiment, since the Internet GW 113 exists between the Internet 110 and the relay node 107, the PCs 111 and 112 connected to the Internet 110 cannot directly access the location registration database 109.
However, if the location registration database 109 has an IP address and the IP protocol can be used as the layer 3 protocol on the wired link in the network system, the PCs 111 and 112 can directly access the location registration database 109. In this case, the location registration database 109 holds the address of the GW node corresponding to the existing area for the wireless terminal ID.

  As a result, the PCs 111 and 112 directly send a message in a TCP / IP packet with a destination address of a GW node that can be transmitted to the wireless terminal 101, thereby eliminating processing on the Internet GW 113. . On the other hand, it becomes easy to attack the location registration database 109 or the GW nodes 102 to 105.

  Moreover, although the presence terminal list | wrist of the said embodiment was set as the structure using reference time, the structure method which does not use reference time is shown in FIG. As shown in FIG. 7, the resident terminal list includes a terminal ID order list and a use order list. The terminal ID order list is arranged in the order of terminal ID, and high-speed search based on the terminal ID is possible. (There is only a terminal ID order list, and a new number in the order of use is provided in the list, and the length of the list is set appropriately by deleting the order of use, for example, after the number 100, at regular intervals. There is also a way to keep it.

The use order list is a list in which elements of the terminal ID order list are arranged in ascending order of use history. FIG. 7 shows that the pair of the terminal ID and the partner address in the 23rd terminal ID order list has been used most recently.
The method for updating these lists is as follows.
The GW node that has received the wireless frame checks whether the wireless terminal ID in the received message is in the resident terminal list. If not, the registration management system 108 is accessed, and the destination address for the wireless terminal ID is inquired.

  If there is no corresponding wireless terminal even after making an inquiry to the registration management system 108, the received message is discarded because it is an unauthorized terminal. Then, a pair of partner addresses obtained by inquiring the wireless terminal ID is added to a predetermined position (for example, number = n) in the terminal ID order list. Then, number = n is inserted immediately after the top mark of the usage order list. And the number (for example, m) in the straight line of the last mark is removed. Then, the line corresponding to the number m in the terminal ID list is deleted. In this way, the length of the list is maintained.

Thereby, when there is no change in the resident area, the destination address can be grasped without referring to the registration management system.
If the resident terminal list originally exists, the same number is removed from the order of use list, both sides of the removed same number are directly connected, and the same number is inserted immediately after the head mark. In this way, the use order list is always kept in the use order.

[Second Embodiment]
Next, an IP network as a network system according to a second embodiment of the present invention will be described with reference to FIG. The IP network according to the present embodiment is an IP network having a gateway node and a terminal, and the gateway node can wirelessly communicate with a wireless terminal that is a non-IP terminal, and a Home Agent (HA) is installed for each wireless terminal. The terminal has a function of creating a message addressed to the wireless terminal and transmitting the message in an IP packet, and the wireless terminal is within a GW node having the wireless terminal under its control. When the terminal transmits an IP packet addressed to the wireless terminal to the HA, the HA transmits the received IP packet to the FA. The FA transmits the message included in the IP packet to the corresponding wireless terminal.

In the present embodiment, an embodiment in which the location registration database 109 is a Home Agent (HA) of mobile IP technology will be described with reference to FIG. In this case, there are often a plurality of location registration databases 109, but for simplicity, they are described with one example. The method of dispersion when there are a plurality is the same as that described in the first embodiment.
In the present embodiment, the Internet GW 113 in FIG. 1 is not necessary due to the network configuration. Assume that the relay node 107 is directly connected to the Internet 110.

In this embodiment, it is assumed that the GW nodes 102 to 105, the relay nodes 106 and 107, and the registration management system 108 all have IP addresses, and all the wired network portions are IP networks.
In the location registration database 109, an HA is prepared for each wireless terminal. (In that case, it is assumed that the location registration database is distributed to a plurality of, and in the most extreme case, it is for each wireless terminal. In any case, the distribution method is described at the end of the first embodiment. There are ways to do this.)

Each GW node 102-105 has an FA. It is assumed that the wireless terminal 101 cannot have an IP communication function / IP address in terms of power consumption.
In this embodiment, by providing HA and FA for each wireless terminal, a mobile technology that is a communication technology with a moving IP terminal can be used for a wireless terminal that is a non-IP terminal.
The wireless terminal 101 determines the message transmission destination in advance and registers it in the registration management system 108. The registration management system 108 stores a set of {wireless terminal ID, HA IP address, destination address}. In the present embodiment, the transmission destination of the wireless terminal 101 is assumed to be the PC 111.

The wireless terminal 101 is mounted on a moving object, and position registration is required when moving. Each of the GW nodes 102 to 105 wirelessly broadcasts the paging area number, and the wireless terminal 101 receives a number different from the paging area number held by itself and recognizes the change of the area in which it is located.
In the present embodiment, it is assumed that the paging area and the GW node have a one-to-one correspondence. (Even if it is not 1: 1, it can be easily inferred.)

  When the presence area changes, the wireless terminal 101 (1) updates the paging area number held by itself, and (2) registers the FA address of the GW node of the new coverage area in its own HA. The FA address is not position information in a positive sense, but can be said to be position information in the sense that the position on the network can be specified in units of paging areas.

  The flow of information transmission from the wireless terminal 101 is almost the same as in the case of the first embodiment (FIG. 6), and is therefore omitted. The difference from the first embodiment is that (1) when sending a TCP / IP packet from a GW node, the originating address is not the GW node address but the FA address or HA address, and (2) the TCP / IP The destination of the message ACK returned by the PC, which is the terminal that received the packet, is the FA (which is once sent to the HA and may be transferred to the FA), and the others are the same.

  The wireless terminal 101 can receive a message from a predetermined PC 111 and an arbitrary PC 112. The PC 111 and the PC 112 transmit the communication message in a TCP / IP packet with the source address as its own address and the destination address as the HA address corresponding to the wireless terminal 101. At the beginning of the communication message, the own address is entered as the source address, the ID of the wireless terminal 101 is entered as the destination address, and the message to be transmitted is entered thereafter.

The HA that has received the TCP / IP packet refers to the address of the held FA and transfers the TCP / IP packet to the FA corresponding to the wireless terminal 101 in the GW node. The FA receives the TCP / IP packet, extracts the message, and transmits the message from the GW node through a wireless channel.
When the communication source is only the PC 111 determined in advance, the message address area can be deleted.

The figure which shows the structure of the network system which concerns on embodiment of this invention. Explanatory drawing which shows the memory content of the registration management system in the network system shown in FIG. Explanatory drawing which shows the memory content of the location registration database in the network system shown in FIG. Explanatory drawing which shows the memory content of the GW node in the network system shown in FIG. FIG. 2 is an explanatory diagram showing the contents of an address table showing the correspondence between the area in the network system shown in FIG. 1 and the address of the corresponding GW node. The flowchart which shows the processing flow when there is information transmission from the radio | wireless terminal in the network system shown in FIG. Explanatory drawing which shows the other example of the located terminal list which the GW node in the network system shown in FIG. 1 hold | maintains. The figure which shows the basic composition of a PDC network. The figure which shows the structure of a PDC-P network. The figure which shows the structural example of a wireless tag network.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Wireless terminal, 102-105 ... GW node, 106, 107 ... Relay node, 108 ... Registration management system, 109 ... Location registration database, 110 ... Internet, 111, 112 ... PC (terminal), 113 ... Internet GW

Claims (10)

A mobile communication network having a radio terminal, a gateway node capable of radio communication with the radio terminal, a location information storage device that holds location information of the radio terminal, and a terminal that is a message transmission destination from the radio terminal Is a network system in which another network to which is connected is connected via a gateway,
The network system includes a terminal address holding unit that holds an address of the terminal that is a transmission destination predetermined for each wireless terminal;
When sending a message from the wireless terminal to the terminal,
When the gateway node receives a radio frame from the radio terminal, the gateway node accesses the terminal address holding unit, specifies a terminal address of a message destination for each radio terminal, and sends the message to the specified destination terminal. Send a message through the gateway,
When sending a message from the terminal to the wireless terminal,
The gateway accesses the location information storage device, acquires location information from the ID of the wireless terminal, transfers a message from the obtained location information to a corresponding gateway node,
The gateway system transfers the message to the wireless terminal. A mobile communication network having a radio terminal, a gateway node capable of radio communication with the radio terminal, a location information storage device that holds location information of the radio terminal, and a terminal that is a message transmission destination from the radio terminal Is a network system in which another network to which is connected is connected via a gateway,
The terminal creates a transmission message that specifies the wireless terminal of the transmission destination by ID, sends the transmission message to the gateway,
The gateway receives the transmission message, accesses the position information storage device, acquires position information from the ID of the wireless terminal, and puts the transmission message from the acquired position information to a corresponding gateway node As well as
The network system, wherein the gateway node transfers the transmission message to the wireless terminal. Holds a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, a location information storage device that holds location information of the wireless terminal, and an address of the terminal that is a predetermined transmission destination for each wireless terminal A network system in which a mobile communication network having a registration management device to be connected to another network to which a terminal that is a message transmission destination from the wireless terminal is connected via a gateway,
The gateway node has a terminal address holding means for holding a terminal address of a wireless terminal presumed to exist in the wireless area of the gateway node and a destination terminal predetermined for each wireless terminal;
The gateway node accesses the terminal address holding means in the gateway node or the registration management device, specifies a destination terminal address of information for each wireless terminal, and addresses the end of the specified destination. A network system characterized by transmitting a message.   4. The terminal address holding means in the gateway node holds a wireless terminal estimated to exist in a wireless area of the gateway node and information on a predetermined destination terminal address thereof. The network system described.   The terminal address holding means in the gateway node holds a wireless terminal estimated to exist in the wireless area of the gateway node, a predetermined destination terminal address, and reference time information. Item 4. The network system according to Item 3.   4. The terminal address holding unit estimates an estimation related to a wireless terminal estimated to exist in a wireless area of the gateway node based on a wireless terminal that has recently transmitted from the gateway node. 6. The network system according to any one of 5. A plurality of the location information storage devices are provided,
A wireless terminal is stored in a distributed manner in a plurality of position information storage devices in units of wireless terminal ID, and has storage means for storing the distribution method.
Or
2. An address resolution node having a known address in advance, and the address resolution node has address holding means for holding the address of a corresponding location information storage device for each wireless terminal ID. The network system according to any one of 2, 4, and 6. A plurality of the registration management devices are provided,
A wireless terminal is distributed and stored in a plurality of registration management devices in units of wireless terminal ID, and has means for storing the distribution method.
Or
7. An address resolution node having a known address in advance, and the address resolution node has address holding means for holding the address of a corresponding registration management apparatus for each wireless terminal ID. The network system according to any one of the above. An IP network having a gateway node and a terminal, wherein the gateway node can wirelessly communicate with a wireless terminal that is a non-IP terminal,
It means for installing a Home Agent (HA) for each of the wireless terminal,
Terminal address holding means for holding the address of the terminal which is a predetermined transmission destination for each wireless terminal;
When sending a message from the wireless terminal to the terminal,
When the gateway node receives a radio frame from the radio terminal, the gateway node accesses the terminal address holding unit, specifies a terminal address of a message destination for each radio terminal, and sends a message to the specified destination terminal Send
The terminal has a function of creating a message addressed to the wireless terminal and transmitting the message in an IP packet;
The wireless terminal or gateway node has a function of notifying the corresponding HA of an FA address that identifies a Foreign Agent (FA) in a gateway node that has the wireless terminal under control,
When the terminal transmits an IP packet addressed to the wireless terminal to the HA, the HA forwards the received IP packet to the FA, and the FA transmits a message included in the IP packet to the corresponding wireless terminal. An IP network characterized by that. Holds a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, a location information storage device that holds location information of the wireless terminal, and an address of the terminal that is a predetermined transmission destination for each wireless terminal A communication method for a network system in which a mobile communication network having a terminal address holding means for connecting to another network to which a terminal that is a message transmission destination from the wireless terminal is connected via a gateway. ,
When sending a message from the wireless terminal to the terminal,
By the gateway node,
Receiving a radio frame from the radio terminal;
Accessing the terminal address holding means to identify a terminal address of a message destination for each wireless terminal;
Sending a message to the identified destination terminal via the gateway,
When sending a message from the terminal to the wireless terminal,
By the gateway
Accessing the location information storage device and obtaining location information from the ID of the wireless terminal;
Transferring a message from the acquired location information to a corresponding gateway node;
By the gateway node
Transferring the message to the wireless terminal;
A communication method for a network system, comprising:

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