JPH1155317A - Radio communication system and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a normal operation not only for an application where a radio terminal serves as the originating side but an application where a radio terminal serves as the terminating side by using a communication control means to perform the cooperative control of a network layer address allocation/release means, a position management means and an address management means and to specify the position of the radio terminal. SOLUTION: Each of mobile servers 400 and 401 has a DNS server function 10 as an address management means, a DHCP server function 11 as a network layer address allocation/release means, an MM server function 12 as a position management means, a CC server function 13 as a communication control means, etc., and also performs the exchange of messages to the radio terminals 100 and 101 respectively about DNS, DHCP, MM and CC. Then the servers 400 and 401 are connected to the routers 300 and 301 respectively and perform the cooperative management of positions and addresses of terminals 100 and 101 against an access request to an internet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a wireless communication method for realizing access to, for example, the Internet via a wireless line.

[0002]

2. Description of the Related Art At present, the Internet is explosively spreading on a worldwide scale, and as a result, a router, which is one of the components on the network, becomes a bottleneck, and satisfactory performance is obtained when users use the Internet. There are many things that cannot be obtained.

[0003] For this reason, Internet providers and others utilizing the Internet for commercial use are replacing routers managed by themselves with faster and larger ones as the number of subscribers increases.

As one of the purposes of replacing the router, it is also important to look ahead to the future where multimedia communication is realized. For example, it is possible to bypass the data link layer without raising the IP packet up to layer 3 or to implement hardware for layer 3 processing. Research and development of routers for hardware is also actively pursued.

[0005] In addition to speeding up and increasing the capacity of such routers, in recent years, mobile access technology has been incorporated into wireless access systems such as PHSs, and as shown in FIG. The construction of a wireless communication system that integrates the Internet with a mobile communication system capable of accessing the above-described IP terminal 500, DNS server 501, WWW server 502, and the like is under way. This type of wireless communication system considers that the wireless terminals 110 and 111 move, and considers Dynamic Hosts Configuration Protocol (DHC).
P) A plurality of wireless base stations 210 and 211 each have a server function, and when the wireless terminals 110 and 111 access the WWW server 502, the wireless terminals 110 and 111 can communicate with each other. IP
By temporarily acquiring an address, the system is configured to access the WWW server 502 to perform Internet access such as a Web search.

In a conventional wireless communication system, for example, when the user of the wireless terminal 110 accesses the WWW server 502 when the user knows the name address of the WWW server 502 but does not know the IP address, the wireless terminal 1
10 to access DNS server 501 once and WWW
After checking the IP address from the name address of the server 502, access is made to the WWW server 502.

[0007] In a system in which the wireless terminals 110 and 111 temporarily acquire their IP addresses from the wireless base stations 210 and 211, the wireless terminals 110 and 111 may be used.
When 11 is the calling side (calling side), the receiving side terminal can know the IP addresses of the wireless terminals 110 and 111 and can communicate with each other.

Incidentally, in recent years, the wireless terminals 110, 1
11 and IP terminal 500 or wireless terminals 110 and 111
Applications between the Internet 600,
For example, Internet telephones and electronic conference systems are being used.

When such an application is used, a call may be made from, for example, the IP terminal 500 to the wireless terminal 110 at the start of communication.

When the wireless terminal 110 is on the receiving side in this way, at the start of communication, the wireless terminal 110
Since the P address has not been obtained from the wireless base stations 210 and 211, the originating IP terminal 500
0 is difficult to know the IP address currently used, and the destination wireless terminal 110 cannot be specified. Therefore, IP terminal 500 cannot access wireless terminal 110 or wireless terminal 111 via Internet 600.

[0011]

As described above, in the case of the conventional wireless communication system in which the wireless base station has only the function of the DHCP server and temporarily assigns an IP address to the wireless terminal at the time of access, If an application that can be the receiving side is used, the calling side terminal cannot know the IP address of the wireless terminal that is the receiving side, so that the application does not operate properly.

The present invention has been made to solve such a problem, and the wireless terminal communicates via a network based on a temporarily assigned IP address such as DHCP, and the wireless terminal arrives. It is an object of the present invention to provide a wireless communication system and a wireless communication method that can normally operate a potential application.

[0013]

According to a first aspect of the present invention, there is provided a wireless communication system in which a wireless base station connected to a network communicates with a wireless terminal existing within its own service area. Position management means for managing the physical address of the wireless terminal obtained by communication in association with positional information of the wireless base station on the network; and a physical address of the wireless terminal obtained by the wireless base station and the network. Address management means for managing the name address assigned to each user using the network address in association with the currently allocated network layer address, and referring to an entry of the address management means to allocate or release the network layer address Network layer address allocating / releasing means for performing addressing, and an address generated on the network. Depending on the conversion request or address release request, the network layer address allocation / release means,
A communication control means for cooperatively controlling the position management means and the address management means is provided.

According to a second aspect of the present invention, in the wireless communication system according to the first aspect, the communication control means has an address conversion request from the name address to a network layer address, and the corresponding name address is the same. In the case where the address is managed by the address management unit, the address management unit converts the name address into a physical address, and converts the physical address obtained by the conversion into position information. ,
The wireless terminal is called based on the location information and the physical address obtained by this conversion, and which wireless base station is in the service area is identified, and the network layer address for the identified wireless terminal is assigned to the network layer. After the assignment by the address allocating / releasing means, cooperative control for notifying the requester of the network layer address is performed.

According to the second and fifth aspects of the present invention, each wireless base station stores the physical address of the wireless terminal obtained from the wireless terminal existing within its own service area and the position information of the wireless base station and the wireless terminal. The address management unit manages the name address of each user, the currently allocated network layer address, and the physical address in association with each other.

Here, when there is an address conversion request from the originating terminal that is the request source to the network, the network layer address allocation / release means refers to the entry of the address management means. Only the correspondence between the name address and the physical address is managed for the address translation request,
If the network address is not assigned to the name address, the location of the wireless terminal is specified from the physical address and the location information of the location management means, and the network layer address is assigned to the located wireless terminal. Thus, the requesting source terminal and the destination wireless terminal can communicate with each other using the notified network layer address.

A wireless communication system according to claim 3 is
3. The wireless communication system according to claim 1, wherein the network layer address allocating / releasing means comprises:
A network layer address is assigned to the wireless terminal for each application for which an access request has been made.

According to the third aspect of the present invention, when a wireless terminal is already assigned a network layer address and receives an access request from an application different from the assigned one, in addition to the assigned one, Further, a new network layer address can be assigned.

According to a fourth aspect of the present invention, in the wireless communication system according to any one of the first to third aspects, the network layer address allocating means, the location managing means, the address managing means, and the network layer address notification are provided. At least one of the means is provided in a node directly or indirectly connected to the network.

According to the present invention, at least one of the location management means, the address management means, the network layer address allocating means, and the network layer address notifying means includes a node on the network, for example, a gateway.
By providing the wireless terminal with any one of a router, a wireless base station, or a specific server machine connected to the node, a network layer address can be assigned to the wireless terminal while the wireless terminal is on the calling side, the receiving side, or moving.

According to a fifth aspect of the present invention, when a corresponding name address is managed in response to an address translation request from a name address to a network layer address, the name address is converted to a physical address of the wireless terminal. Performing the conversion, converting the physical address of the wireless terminal obtained by the conversion into the position information of the wireless base station, and obtaining the position information of the wireless base station and the wireless terminal obtained by the conversion. Calling the wireless terminal based on the physical address of the wireless terminal and specifying which wireless base station the wireless terminal is in, and allocating a network layer address to the located wireless terminal to request the wireless terminal. And notifying the user.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a wireless communication system according to one embodiment of the present invention. In the figure,
100 and 101 are wireless terminals, 200 to 203 are wireless base stations, 300 and 301 are routers, 400 and 401 are mobile servers, 501 is a Domain Name System server (hereinafter D).
Reference numeral 500 denotes an Internet Protocol terminal (hereinafter referred to as an IP terminal), and reference numeral 600 denotes the Internet constructed by interconnecting a plurality of networks.

This wireless communication system has an IP terminal 500, a DNS server 501, a WWW
The server 502, the routers 300, 301, and the like are connected, and a plurality of wireless base stations 200
To the wireless terminals 100 to 101 existing in the service area of the wireless base station.
A wireless line is established, and data is transmitted and received to and from the IP terminal 500 and each of the servers 501 and 502. DNS server 501 and WWW server 5 shown here
02, routers 300 and 301, wireless base stations 200 to 20
3. The mobile servers 400 and 401 or the gateway 700 shown in the fourth embodiment are nodes on the network.

The wireless terminals 100 and 101 have a DNS client function, a Dynamic Hosts Configuration Protocol client function (hereinafter referred to as a DHCP client function), a Mobility Management client function as a location management function (hereinafter referred to as an MM client function), and a communication control function. The terminal has a Communication Control client function (hereinafter, referred to as a CC client function), and performs at least connectionless communication using IP or the like. Routers 300 and 301 are IP
This is the same router device as the conventional one that performs forwarding processing and the like. The mobile servers 400 and 401 include a DNS server function 10 as an address management unit, a DHCP server function 11 as a network layer address allocation / release unit, an MM server function 12 as a location management unit, and a CC server function 13 as a communication control unit. Wireless terminals 100 and 101 and DNS and DH, respectively.
A server that exchanges messages related to CP, MM, and CC.

As shown in FIG. 2, the MM server function 12 is configured so that each of the wireless base stations 200 to 203 obtains the physical addresses (the physical addresses of the wireless terminals 100 and 101 obtained from the wireless terminals 100 and 101 existing in the service area of the own station). Terminal identifier or M
AC address 21) and location information (location registration area identifier 22, wireless base station identifier 2) for each of the wireless base stations 200 to 203 connected on the Internet 600.
3, a communication flag 24, and the like, and a table 40 that manages the association with the table 40. The function of registering the position in the table 40 and updating the association with the movement of the wireless terminals 100 and 101 and the conversion function It is. Communication flag 24
Indicates that flag information indicating whether the wireless terminal 100 or the wireless terminal 101 is communicating is recorded for each entry.

Each of the radio terminals 100 and 101 stores the location registration area identifier stored in its own memory and the radio base station 20.
When the location registration area identifier periodically notified from 0 to 203 is different, the location registration message is transmitted from the wireless terminals 100 and 101 and the location registration operation is started.
Therefore, this MM server function 12
When a location registration message from 0 or 101 is received, the physical address 21 included in the message is registered in the entry.

When the radio terminals 100 and 101 receive a call, the MM server function 12 calls (paging) with the physical addresses of the radio terminals 100 and 101 based on the location registration area identifier. However, the wireless terminal 10
If 0 and 101 are already communicating, the radio base station identifier is already grasped, and the radio terminals 100 and 101 are further recognized.
Since the control channel individually attached to the wireless terminals 100 and 101 is also grasped, paging (paging) is performed using the physical addresses of the wireless terminals 100 and 101 based on the wireless base station identifier or the associated control channel.

As shown in FIG. 3, the DNS server function 10 includes a name address 31 assigned to each user using the Internet 600, an IP address (network layer address) 32 currently assigned, and a terminal identifier (physical address). ) 22 and a function of notifying the IP address 32 in response to a request from a client (such as the IP terminal 500).

More specifically, when a name-IP address conversion request is received from the DNS client function of the IP terminal 500, the IP address 32 corresponding to the name address 31 of the wireless terminal 100 is checked and a name-IP address conversion response To the IP terminal 500
This is a function to notify the address. Also, when the wireless terminal 100 moves and the DNS server 501 takes control of the area (domain)
When a location registration request message transmitted from the wireless terminal 100 is received when the mobile terminal 100 is entered, the name address 31 and the physical address 21 included in the message are registered in association with each other, and a location registration response message is transmitted. .
Further, when the wireless terminal 100 moves out of the domain,
When receiving the location registration deletion request message transmitted from the wireless terminal 100, the entry corresponding to the name address 31 and the physical address 21 is deleted, and the location registration deletion message is transmitted.

As shown in FIG. 4, the DHCP server function 11 has a table 40 for registering and managing the physical address 21 and the assigned IP address 32 in association with each other. When there is an access request including the name address 31 via the Internet 600 to the IP address 100 or the like, the IP address is referred to the name address 31 by referring to the table 30 of the DNS server function 10.
It is determined whether or not the address 32 is assigned correspondingly. If not, the CC server function 13
Cooperates with the MM server function 12 to identify the wireless terminal 1 from the location information and the physical address 21 of the MM server function 12.
A new IP address 32 is assigned based on the location of the address 00 and registered in the table 40, while the IP address 32 registered in the table 30 in response to the address release request
Function to delete and release

The CC server function 13 includes an outgoing / incoming call connection function (partial CO type), a wired / wireless resource (channel) allocation function, and a call response function (CL type / CO type). (The location registration area identifier 22, the wireless base station identifier 23, the communication flag 24, etc.) and the physical address 21 to call the wireless terminals 100 and 101, and the wireless terminal 10
This function specifies the positions of 0 and 101 and performs connection setting as necessary.

The CC server function 13 includes DNS, DH
By assembling / disassembling messages exchanged between the CP, MM and CC servers / clients, referring / analyzing the types and protocol identifiers of the messages and transferring the messages to desired functions, the DHCP server function 11,
It has a communication control function that operates in cooperation with the MM server function 12 and the DNS server function 10.

Next, the operation of the wireless communication system according to the first embodiment will be described.

First, an Internet access operation in which the wireless terminal 100 is on the calling side (calling side) will be described with reference to FIG.

For example, as an example of Internet access in which the wireless terminal 100 is the calling side, the wireless terminal 100
There is a case where a web search is performed by accessing the WW server 502. In this case, when a request to access the WWW server 502 and perform a Web search occurs in the wireless terminal 100, as shown in FIG.
An IP address acquisition request is transmitted to the mobile server 400 by the client function. The IP address acquisition request includes a terminal identifier of the wireless terminal 100, a wireless base station identifier, a name address, and the like as necessary.

The mobile server 400 that has received the request for obtaining the IP address
Physical address (terminal identifier) in P address acquisition request
And the IP address to be assigned to the wireless terminal 100, and the DNS server function 10
Register the address and return an IP address acquisition response. This IP address acquisition response includes the wireless terminal 10
0 contains the IP address information assigned to “0”.

When the wireless terminal 100 receives the IP address acquisition response, the wireless terminal 100 checks whether the IP address of the WWW server 502 is registered in itself.

As a result of this investigation, if the wireless terminal 100 does not know the IP address of the WWW server 502, it sends a name-IP address conversion request to the mobile server 400 by the DNS client function. This name-I
The P address conversion request includes the name address.

The mobile server 400 that has received the name-IP address conversion request checks whether or not the name address is registered by the DNS server function 10.

If no name address is registered, the mobile server 400 further moves to the DNS server 50.
1 and the DNS server 501 returns the name-IP address conversion response to the wireless terminal 100 in a form including the IP address of the WWW server. The wireless terminal 100 that has received the name-IP address conversion response stores the IP address converted from the name address by the DNS client function in its own memory. After that, transmission / reception of IP packets is started to perform Web search.

When a request for terminating the Web search is issued to the wireless terminal 100 after performing the Web search, the wireless terminal 100
Transmits the IP address release request from the wireless terminal 100 to the mobile server 400 by the DHCP client function after notifying the WWW server 502 of the end of the Web search.

The mobile server 400 that has received the IP address release request deletes the correspondence between the corresponding IP address and the terminal identifier by using the DHCP server function 11, and returns an IP address release response. With the above operation, the Web search ends. At this time (when an IP address release request is received), the mobile server 400
Deletes the association between the corresponding IP address and the name address by the DNS server function 10.

Note that a protocol that does not return an IP address release request or a protocol that does not transmit an IP address release request is also conceivable. In this case, the configuration may be such that the registration cancellation of the IP address and the end of the communication are managed by the timeout of the timer.

Subsequently, referring to FIG. 6 and FIG.
An Internet access operation in which 00 is the called side (called side) will be described. In this case, two cases are considered: an operation example at the time of starting access for allocating an IP address for the first time (example of FIG. 6) and an operation example when another is accessed during the Web search (example of FIG. 7).

First, the example of FIG. 6 will be described.

In this case, when a request to make an Internet call to the wireless terminal 100 occurs at the IP terminal 500, the IP terminal 500
In order to know the address, a name-IP address conversion request is sent to the mobile server 40 via the DNS server 501.
Send to 0.

The mobile server 400, which has received the name-IP address conversion request, checks, by using the DNS server function 10, whether or not the wireless terminal 100 having the corresponding name address exists in its own domain. To obtain a physical address (terminal identifier) corresponding to.

Here, the mobile server 400 confirms the name address and acquires the physical address (terminal identifier).
The MM server function 12 acquires the location registration area information (router identifier, wireless base station identifier, or an identifier indicating a position independent of them) from the acquired physical address from the acquired physical address.

Subsequently, the mobile server 400 uses the CC server function 13 to make a call request (location confirmation request) for the wireless terminal 100 based on the acquired location registration area information. When the wireless terminal 100 receives this paging request (location confirmation request), the paging response (including the name address and the terminal identifier information, in addition to the identifier of the wireless base station 200 in which the terminal is currently located in the service area). Response to the mobile server 400.

The mobile server 400 that has received the call response (location confirmation response) registers the location information (identifier of the wireless base station) of the wireless terminal 100 in the MM server function 12 and also uses the DHCP server function 11 to register the location information. The wireless base station 200 transmits an IP address assignment request to the wireless terminal 100. This IP address assignment request includes IP address information to be assigned.

The wireless terminal 100 that has received the IP address assignment request registers its own IP address and returns an IP address assignment response using the DHCP client function. The communication procedure can be shortened by using a “request / response message” that also serves as an exchange of messages of the IP address assignment request / response and the position confirmation request / response.

When the mobile server 400 receives this IP address assignment response, the DNS server function 10
A name-IP address conversion response is returned to P terminal 500, and the IP address (network layer address) of wireless terminal 100 is also registered.

Thus, the wireless terminal 100 and the IP terminal 5
00 is a state where IP packets can be mutually transmitted and received, and an Internet telephone can be started. Then, when an Internet telephone termination request is issued to the wireless terminal 100 to terminate the Internet telephone call, the wireless terminal 100 transmits an IP address release request to the mobile server 400 by the DHCP client function. The mobile server 400 that has received the IP address release request returns an IP address release response to the wireless terminal 100 using the DHCP server function 11. Note that the mobile server 400 may transmit an IP address release request to the IP terminal 500. In this case, the IP terminal 500 that has received the IP address release request
Returns an IP address release response to the mobile server 400. In this case, IP terminal 500 deletes the registration of wireless terminal 100 from its own ARP table or name table association field. A protocol that does not return an IP address release response or a protocol that does not transmit an IP address release response is also conceivable. In this case, the configuration may be such that the registration is deleted and the communication is terminated by timeout of a timer. The method of using this timer can be the same as that of the other embodiments described below. The Internet telephone is terminated by the above operation.

In the example shown in FIG. 6, the case where the termination of the Internet telephone is triggered from the wireless terminal 100 has been described.
A configuration in which the end operation of the Internet telephone is started from 0 may be adopted. Alternatively, a configuration in which the location registration area information of the wireless terminal 100 is originally managed in wireless base station identifier units may be used. In this case, there is no need to call the wireless terminal 100.

Next, a second operation example when the wireless terminal 100 is on the receiving side will be described with reference to FIG.

The second operation example is an example in which the IP terminal 500 requests the wireless terminal 100 to connect to the Internet terminal while the wireless terminal 100 has already accessed the WWW server 502 and is searching for the Web. .

In this case, the sequence is basically a combination of the operations of FIG. 5 and FIG. 6, but the mobile server 400 that has received the name-IP address conversion request for the incoming call from the IP terminal 500 Since an IP address is assigned to 100, as shown in FIG.
Due to the DHCP server function 11, the wireless terminal 10
7, the name-to-IP address conversion is performed by the DNS server function 10 without performing the IP address assignment request / response as shown in FIG.
The IP address assigned to “0” is notified to the IP terminal 500. That is, a name-IP address conversion response is performed.

A request for a new IP address allocation request is sent instead of the already allocated IP address, and the IP address newly assigned to the wireless terminal 100 is notified to the IP terminal 500. In other words, name-IP
Send an address translation response.

In this case, the position information of the wireless terminal 100 is
Since it has already been grasped at the start of the Web search operation, CC
A call request (location confirmation request) by the server function 13 is not performed.

Thus, the IP terminal 500 can make an Internet call with the wireless terminal 100 during the Web search.

Further, when the Web search of the wireless terminal 100 is completed during an Internet telephone call, the wireless terminal 100
Transmits an IP address release request for Web search to the mobile server 400 using the DHCP client function. In the DHCP client function, an IP address assignment status is managed for each application. The mobile server 400 that has received the IP address release request uses the DHCP server function 11 to
An IP address release request is transmitted to server 502, and an IP address release response for Web search is returned to wireless terminal 100. WWW server 50
When the IP address release request is received in 2, an IP address release response is returned to the mobile server 400. With the above operation, the Web search is completed and only the Internet telephone service is performed. And
When ending the Internet call, when a request to end the Internet call is issued to the wireless terminal 100, the wireless terminal 100 transmits an IP address release request to the mobile server 400 by the DHCP client function.

The mobile server 400 that has received this IP address release request uses the DHCP server function 11
An IP address release response is returned to the wireless terminal 100, and an IP address release request is transmitted to the IP terminal 500.

The IP terminal 500 having received the IP address release request sends an IP address release response to the mobile server 40.
Reply to 0. The Internet telephone is terminated by the above operation. In this example of the operation, the case where the termination of the Internet telephone is triggered from the wireless terminal 100 has been described.
A configuration in which the end operation of the Internet telephone is started from 0 may be adopted. Thus, according to the wireless communication system of the first embodiment, the DNS server function 10, the DH
Mobile servers 400, 40 having a CP server function 11, an MM server function 12, a CC server function 13, etc.
1 are connected to the respective routers 300 and 301, and the mobile servers 400 and 401 perform the location management and address management of the wireless terminals 100 and 101 in cooperation with each other in response to an access request on the Internet. In addition to the application such as the Web search on the calling side, not only the application on the receiving side where the wireless terminal 100 accesses the wireless terminal 100 via the Internet 600 and makes an Internet telephone call but also the application on the receiving side operates normally. Can be done.

In other words, normal communication can be performed via the Internet 600 even when the wireless terminals 100 and 101 are on the calling side, the receiving side, and moving.

Next, a radio communication system according to a second embodiment will be described with reference to FIG.

The wireless communication system according to the second embodiment is a modification of the first embodiment.

As shown in FIG.
In each of the routers 300a and 301a connected to the mobile server 400, the mobile server 400, 401 described in the first embodiment is provided.
, Ie, a DNS server function 10, a DHCP server function 11, an MM server function 12, a CC server function 13, etc., and an IP forwarding processing function of the routers 300 and 301.

Next, the operation of the wireless communication system according to the second embodiment will be described. In the wireless communication system according to the second embodiment, the operation when the wireless terminal 100 is on the calling side is the same as the operation of the mobile server 400 described with reference to FIG.
The operation when the wireless terminal 100 is on the receiving side will be described.

When the wireless terminal 100 makes an Internet call from, for example, the IP terminal 500 on the receiving side to the wireless terminal 100, the IP terminal 500 first
In order to know the IP address of the router 30, a name-IP address conversion request is sent to the router 30 via the DNS server 501.
0a.

When the router 300a receives the name-IP address conversion request, the DNS server function 10 checks whether or not the wireless terminal 100 having the corresponding name address exists in its own domain, and checks the name address. Then, the location registration area information of the wireless terminal 100 is acquired from the MM server function 12, and the wireless terminal 100 is acquired by the CC server function 13 based on the acquired location registration area information.
Request (location confirmation request).

When a call response (location confirmation response) is returned from the wireless terminal 100 in response to the call request (location confirmation request), the router 300a returns to the MM.
In addition to registering the position information of the wireless terminal 100 (identifier of the wireless base station) in the server function 12, the DHCP server function 1
1, the corresponding radio base station 200 and radio terminal 10
0, and transmits an IP address assignment request.

When an IP address assignment response is returned from wireless terminal 100 in response to the IP address assignment request, router 300a causes DNS server function 10 to send the IP address assignment response.
A name-IP address conversion response is returned to the P terminal 500, whereby the wireless terminal 100 and the IP terminal 500
Can send and receive IP packets to each other to make Internet calls.

When the Internet telephone is terminated and the IP address release request is received by the router 300a,
The DHCP server function 11 returns an IP address release response to the wireless terminal 100 or the IP terminal 500, and terminates the Internet telephone by the above operation. At this time (when receiving the IP address release request), the router 300a also deletes the association between the corresponding IP address and name address by the DNS server function 10.

Next, a description will be given of an operation in the case where the IP terminal 500 requests the wireless terminal 100 to connect to the Internet while the wireless terminal 100 is already searching for a Web.

In this case, the router 3 that has received the name-IP address conversion request for the incoming call from the IP terminal 500
In 00a, since the IP address has already been assigned to the wireless terminal 100, the DNS server function 10 sends a name-IP address conversion response. In this case, W
Since the position information of the wireless terminal 100 is known at the time of starting the eb search operation, a call request (a position confirmation request) by the CC server function 13 is not performed. Thus, the IP terminal 500 can make an Internet call with the wireless terminal 100 during the Web search.

Further, when the Web search of the wireless terminal 100 is completed during an Internet telephone call, the wireless terminal 100
Is, by the DHCP client function, the router 300a
Transmits an IP address release request for Web search. In the DHCP client function, an IP address assignment status is managed for each application.

The router 300a, having received the IP address release request, uses the DHCP server function 11 to
An IP address release request is transmitted to server 502, and an IP address release response for Web search is returned to wireless terminal 100. WWW server 50
2 receives the IP address release request, the router 300
a), and returns an IP address release response to a. With the above operation, the Web search is completed and only the Internet telephone service is performed.

When an Internet telephone termination request is issued to the wireless terminal 100 to terminate the Internet telephone call, the wireless terminal 100 transmits an IP address release request to the router 300a by the DHCP client function.

The router 300 a that has received the IP address release request sends an IP address release response to the wireless terminal 100 and transmits an IP address release request to the IP terminal 500 using the DHCP server function 11.

The IP terminal 500 that has received the IP address release request returns an IP address release response to the router 300a. The Internet telephone is terminated by the above operation. As described above, according to the wireless communication system of the second embodiment, the DNS server function 10 and the DHCP server function 1
1. Each of the routers 300 connected to the Internet 600 with the MM server function 12 and the CC server function 13
a, 301a, the Internet 60
0 on these routers 300 for an access request on
a and 301a specify the positions of the wireless terminals 100 and 101 by coordinating the position management and the address management of the wireless terminals 100 and 101, so that when the wireless terminals 100 and 101 are the calling side, they are also the receiving side. It is possible to communicate normally in both cases and when moving further.

Next, a wireless communication system according to a third embodiment will be described with reference to FIG.

The wireless communication system according to the third embodiment is a modification of the first embodiment.

As shown in FIG. 9, in this case, each router 3
00, 301 connected to a plurality of radio base stations 200a-200
203a, each function of the mobile servers 400 and 401 described in the first embodiment, that is, the DNS server function 10, the DHCP server function 11, the MM server function 12
And the CC server function 13 and the like and the radio base stations 200 to 2
03 communication functions.

In the wireless communication system according to the third embodiment, the operation when the wireless terminal 100 is the calling side is described in FIG.
The movement of the mobile server 400 described in
The operation when the wireless terminal 100 is on the receiving side will be described below.

When the wireless terminal 100 makes an Internet call to the wireless terminal 100 from, for example, the IP terminal 500 on the receiving side, the IP terminal 500
In order to know the IP address 00, a name-IP address conversion request is transmitted to the wireless base station 200a via the DNS server 501.

When the wireless base station 200a receives the name-IP address conversion request, the DNS server function 10 checks whether or not the wireless terminal 100 having the corresponding name address exists in its own domain. Is confirmed, the MM server function 12 sends the wireless terminal 1
The location information of the wireless terminal 100 is acquired by the CC server function 13 based on the acquired location registration area information.

When a call response (location confirmation response) is returned from wireless terminal 100 in response to the call request (location confirmation request), radio base station 200a
The position information (identifier of the wireless base station) of the wireless terminal 100 is registered in the MM server function 12 and the IP address is
Assign an address. When an IP address assignment response is returned from the wireless terminal 100 in response to the IP address assignment request, the wireless base station 200a sets the DNS server function 10
Returns a name-IP address conversion response to the IP terminal 500, whereby the wireless terminal 100 and the IP terminal 500 can send and receive IP packets to and from each other to make an Internet call.

When the Internet telephone is terminated and an IP address release request is received by the wireless base station 200a, the DHCP server function 11 returns an IP address release response to the wireless terminal 100 or the IP terminal 500. The Internet telephone is terminated by the above operation.

Next, a description will be given of an operation in the case where the wireless terminal 100 has already accessed the WWW server 502 and is performing a Web search, and the IP terminal 500 requests the wireless terminal 100 to connect to the Internet.

In this case, the wireless base station 200a that has received the name-IP address conversion request for an incoming call from the IP terminal 500 has already been assigned an IP address to the wireless terminal 100. IP address conversion is performed, and the IP address assigned to the wireless terminal 100 at the time of Web search is changed to the IP terminal 500.
Notify. That is, a name-IP address conversion response is performed. In this case, since the position information of the wireless terminal 100 has already been grasped at the start of the Web search operation, a call request (a position confirmation request) by the CC server function 13 is not performed. Thus, the IP terminal 500 can make an Internet call with the wireless terminal 100 during the Web search.

Further, when the Web search of the wireless terminal 100 is completed during the Internet telephone call, the wireless terminal 100
Is transmitted to the wireless base station 20 by the DHCP client function.
The IP address release request for the Web search is transmitted to 0a. In the DHCP client function, an IP address assignment status is managed for each application.

The wireless base station 200a having received the IP address release request uses the DHCP server function 11 to
An IP address release request is transmitted to WW server 502, and an IP address release response for Web search is returned to wireless terminal 100. When the WWW server 502 receives the IP address release request, it returns an IP address release response to the wireless base station 200a.
With the above operation, the Web search is completed and only the Internet telephone service is performed. And
When a request to end the Internet telephone is issued to the wireless terminal 100 when ending the Internet telephone, the wireless terminal 100 transmits an IP address release request to the wireless base station 200a by the DHCP client function.

[0094] The wireless base station 200 a that has received the IP address release request returns an IP address release response to the wireless terminal 100 and transmits an IP address release request to the IP terminal 500 using the DHCP server function 11. I do.

IP terminal 500, which has received the IP address release request, sends an IP address release response to radio base station 200a.
Reply to. The Internet telephone is terminated by the above operation.

As described above, according to the wireless communication system of the third embodiment, the DNS server function 10, the DHCP server function 11, the MM server function 12, the CC server function 13, and the like are provided at each wireless base station connected to the Internet 600. By providing the wireless terminals 200a to 203a, any one of the wireless base stations 200a to 203a responds to an access request on the
Since the position management of the wireless terminals 100 and 101 is specified by coordinating the position management of the wireless terminal
Normal communication can be performed regardless of whether 0 or 101 is the calling side, the called side, or the moving side.

Next, a radio communication system according to a fourth embodiment will be described with reference to FIG. The wireless communication system of the fourth embodiment is a modification of the first embodiment.

As shown in FIG. 10, in this case, each router 300, 301 is connected to the Internet 600 via gateways 700, 701, and each function of the mobile server 400 shown in FIG.
An NS server function 10, a DHCP server function 11, an MM server function 12, a CC server function 13, etc., and a function of the gateway itself are provided.

Next, the operation of the radio communication system according to the fourth embodiment will be described. In the wireless communication system according to the fourth embodiment, when the wireless terminal 100 is on the calling side, the operation of the mobile server 400 described with reference to FIG. The operation when the terminal 100 is on the receiving side will be described.

When the wireless terminal 100 makes an Internet call to the wireless terminal 100 from, for example, the IP terminal 500 on the receiving side, the IP terminal 500 first
In order to know the IP address of 00, a name-IP address conversion request is transmitted to the gateway 700 via the DNS server 501.

When the gateway 700 receives the name-IP address conversion request, the DNS server function 10 checks whether the wireless terminal 100 having the corresponding name address exists in its own domain, and checks the name address. Then, the wireless terminal 1 is transmitted from the MM server function 12.
The location information of the wireless terminal 100 is acquired by the CC server function 13 based on the acquired location registration area information.

When a call response (location confirmation response) is returned from wireless terminal 100 in response to the call request (location confirmation request), gateway 700
The position information (identifier of the wireless base station) of the wireless terminal 100 is registered in the MM server function 12 and the IP address is
Assign an address. When an IP address assignment response is returned from wireless terminal 100 in response to the IP address assignment request, gateway 700 sets DNS server function 10
Returns a name-IP address conversion response to the IP terminal 500, whereby the wireless terminal 100 and the IP terminal 500 can send and receive IP packets to and from each other to make an Internet call.

Then, when the Internet telephone is terminated and the IP address release request is received by the gateway 700, the DHCP server function 11 returns an IP address release response to the wireless terminal 100 or the IP terminal 500. The operation terminates the Internet call.

Next, a description will be given of the operation in the case where the wireless terminal 100 has already accessed the WWW server 502 and is performing a Web search, and the IP terminal 500 has requested the wireless terminal 100 to connect to the Internet.

In this case, since the gateway 700 that has received the name-IP address conversion request for the incoming call from the IP terminal 500 has already been assigned an IP address to the wireless terminal 100, the DNS server function 10 uses the name-IP address. After the conversion, the IP address assigned to the wireless terminal 100 at the time of the Web search is changed to the IP terminal 500.
Notify. That is, a name-IP address conversion response is performed. In this case, since the position information of the wireless terminal 100 has already been grasped at the start of the Web search operation, a call request (a position confirmation request) by the CC server function 13 is not performed. Thus, the IP terminal 500 can make an Internet call with the wireless terminal 100 during the Web search.

Further, when the Web search of the wireless terminal 100 is completed during an Internet telephone call, the wireless terminal 100
Is a gateway 7 by the DHCP client function.
00, an IP address release request for Web search is transmitted. In the DHCP client function, an IP address assignment status is managed for each application.

The gateway 700 that has received the IP address release request uses the DHCP server function 11 to
An IP address release request is transmitted to WW server 502, and an IP address release response for Web search is returned to wireless terminal 100. When the WWW server 502 receives the IP address release request, it returns an IP address release response to the gateway 700.
With the above operation, the Web search is completed and only the Internet telephone service is performed. And
When a request to end the Internet telephone is issued to the wireless terminal 100 when ending the Internet telephone, the wireless terminal 100 transmits an IP address release request to the gateway 700 by the DHCP client function.

The gateway 700 that has received the IP address release request returns an IP address release response to the wireless terminal 100 and transmits an IP address release request to the IP terminal 500 using the DHCP server function 11.

The IP terminal 500 that has received the IP address release request sends an IP address release response to the gateway 700.
Reply to. The Internet telephone is terminated by the above operation.

As described above, according to the radio communication system of the fourth embodiment, the DNS server function 10, the DHCP server function 11, the MM server function 12, the CC server function 13, and the like are provided in the gateway 700 connected to the Internet 600. Thus, in response to an access request on the Internet 600, the gateway 700 specifies the positions of the wireless terminals 100 and 101 in cooperation with the position management and the address management of the wireless terminal 100, so that the wireless terminals 100 and 101 In this case, the communication can be normally performed regardless of whether the terminal is on the receiving side or when the user moves.

The connection form can be applied to other than the first to fourth embodiments.
0 may be directly connected to the mobile server 400.

[0112]

As described above, according to the present invention, when communication is performed by temporarily allocating a network layer address to a radio terminal, communication control is performed by the network layer address allocating / releasing means, the position management means and the address management means. Since the means controls the cooperation and specifies the position of the wireless terminal, not only the application in which the wireless terminal is the calling side,
Even the application in which the wireless terminal is the receiving side can operate normally.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a table of an MM server function of the wireless communication system.

FIG. 3 is a view showing a table of a DNS server function of the wireless communication system.

FIG. 4 is a diagram showing a table of a DHCP server function of the wireless communication system.

FIG. 5 is a sequence chart showing an operation of the wireless communication system according to the first embodiment when a wireless terminal is on the calling side;

FIG. 6 is a sequence chart showing a first operation example in a case where a wireless terminal is a receiving side in the wireless communication system according to the first embodiment;

FIG. 7 is a sequence chart showing an operation procedure in a case where the wireless terminal executes a plurality of applications simultaneously, as a second operation example in a case where the wireless terminal is the receiving side in the wireless communication system of the first embodiment.

FIG. 8 is a diagram showing a configuration of a wireless communication system according to a second embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a wireless communication system according to a third embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a wireless communication system according to a fourth embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a conventional wireless communication system.

[Explanation of symbols]

10 DNS server function, 11 DHCP server function,
12: MM server function, 13: CC server function, 10
0, 101: wireless terminal, 200, 201, 202, 20
3: wireless base station, 300b, 301b: router, 40
0, 401: Mobile server, 500: IP terminal, 50
1. DNS server, 502 WWW server, 600 Internet, 700 Gateway.

Claims (5)

[Claims] 1. A wireless base station connected to a network, comprising: a physical address of the wireless terminal obtained by communicating with a wireless terminal existing in a service area of the wireless base station; positional information of the wireless base station on the network; A location management unit that manages the physical address of the wireless terminal obtained by the wireless base station, a name address assigned to each user using the network, and a currently allocated network layer address. Address management means for attaching and managing the address; network layer address allocation / release means for allocating or releasing the network layer address by referring to the entry of the address management means; and an address conversion request or address release occurring on the network. On demand, said network layer address allocation / release And a communication control means for cooperatively controlling the position management means and the address management means. 2. The wireless communication system according to claim 1, wherein the communication control unit has an address conversion request from the name address to a network layer address, and the corresponding name address is managed by the address management unit. In this case, the address management unit converts the name address to the physical address, and the position management unit converts the physical address obtained by the conversion to the position information. Calling the wireless terminal based on the information and the physical address, specifying which wireless base station is in the service area, and assigning a network layer address for the located wireless terminal to the network layer address allocating / releasing means After that, cooperate control to notify the requester of the network layer address Wireless communication system, wherein the door. 3. The wireless communication system according to claim 1, wherein the network layer address allocating unit allocates a network layer address to the wireless terminal for each application for which an access request has been made. The wireless communication system according to claim 1, wherein 4. The wireless communication system according to claim 1, wherein at least one of the network layer address allocation / release unit, the location management unit, the address management unit, and the communication control unit includes: A wireless communication system provided in a node directly or indirectly connected to the network. 5. When a corresponding name address is managed in response to an address translation request from a name address to a network layer address, translating said name address to a physical address of a wireless terminal; Converting the physical address of the wireless terminal obtained by the above to the position information of the wireless base station; and performing wireless communication based on the position information of the wireless base station obtained by the conversion and the physical address of the wireless terminal. Call the terminal,
A step of specifying which wireless base station the wireless terminal is in, and a step of allocating a network layer address to the located wireless terminal and notifying the wireless terminal to a request source. Communication method.