JPH1188433A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the transfer efficiency of an IP packet as compared with Mobile IP in IP packet transfer with a radio terminal. SOLUTION: A mobile communication exchange equipment 401 connected to ISDN 601 or an internet 600 is provided with a position/address managing part 400 for managing a radio base station 200 which exchanges data with the radio terminal 100 in a communication system. In the system, an IP terminal 500 on ISDN 601 transmits a CL packet without knowing only the telephone number of the radio terminal 100. In this case, when an access request including the telephone number, etc., of the radio terminal 100 is executed from the IP terminal 500, the position/address managing part 1400 executes the correspondence and conversion of the physical address (a terminal identifier or a MAC address) of the radio terminal 100, position information(position register area identifier and radio base station identifier), the telephone number and the IP address and reports the IP address of the radio terminal 100 to an IP terminal 500.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication system for performing communication between a wireless terminal and another terminal (wireless terminal or fixed terminal) via a network.

[0002]

2. Description of the Related Art In the world of the Internet, due to its explosive spread, a router device, which is a key component of a network, has become a bottleneck, and it has often occurred that satisfactory performance cannot be obtained at the time of user use. For this reason, Internet providers are replacing their core routers with higher-speed, higher-capacity routers.

[0003] Further, in anticipation of the future in which multimedia communications will be realized, as a router device with higher speed and larger capacity,
2. Description of the Related Art Research and development of router devices that bypass IP packets in the data link layer without raising the IP packets to Layer 3 and that implement hardware of Layer 3 processing have been actively conducted.

In addition to the speeding up of such a router device, mobile access technology is incorporated into a wireless access system such as a PHS, and Internet access (for example, W
A system capable of accessing a WW server has been studied (see FIG. 8). The conventional communication system shown in FIG. 8 includes base station controllers (BSC) 300 and 301
By supporting the Mobile IP agent function, the IP terminal 500 on the network can connect to the wireless terminal 1 regardless of which node on the network it is connected to.
Wireless terminal 10 using the home addresses 00, 101
0 and 101 can be accessed.

That is, the conventional communication system includes a home agent function (HA function) for managing the current positions of the wireless terminals 100 and 101, and a foreign agent function (FA function) for managing the wireless terminal 100 in a destination sub-network. ) And BSC301, 30 respectively.
0.

In such a conventional communication system,
When the wireless terminal 101 accesses the wireless terminal 100, first, the BSC 301 having the HA function encapsulates the IP packet addressed to the wireless terminal 100 and converts the BSC 300 having the FA function through the Internet 600.
Transfer to The BSC 300 that has received the encapsulated IP packet decapsulates the encapsulated IP packet, restores the original IP packet, and transmits the original IP packet to the wireless terminal 100.

On the other hand, the wireless terminal 100
When the wireless terminal 101 accesses the
The IP packet is transferred from the BSC 301 having the HA function to the wireless terminal 101 as it is via the base station 203 without being encapsulated as described above because the IP packet exists in the network 403.

When Mobile IP is used, the wireless terminal 10
Communication can be performed without changing the IP address assigned to 0, 101, or the like in the destination network.

As a result, the movement of the user of the wireless terminals 100 and 101 can be hidden. Also, there is an advantage that the IP session can be continued and communication performed even when the wireless terminals 100 and 101 move to different subnets while moving (communication can be continued even during movement during communication).

[0010]

However, in the case of such a communication system using Mobile IP, "the transfer efficiency in encapsulated transfer is poor in a foreign network", and There are problems such as poor communication quality due to connection, inability to cope with real-time handoff control, and "always transferring packets via the home agent, so there is redundancy in the transfer path and communication delay time increases". Was.

The present invention has been made to solve such a problem, and in performing packet communication using IP, compared to IP packet communication using Mobile IP,
Provided is a communication system capable of "improving packet transfer efficiency", "improving communication quality at handoff", "performing smooth inter-cell movement", and "reducing delay time generated from a transfer path". It is intended to be.

[0012]

According to a first aspect of the present invention, there is provided a wireless terminal, comprising: a wireless base station and another wireless terminal or the network through a network to which the wireless base station is connected; In a communication system that performs connectionless communication or connection communication with a fixed terminal connected thereto, when an access request to at least the wireless terminal occurs on the network, the access request is obtained from a wireless base station that accommodates the wireless terminal. The physical address of the wireless terminal, the location information of the wireless terminal and the wireless base station, the network layer address for connectionless communication of the wireless terminal, and the network layer address for connection communication of the wireless terminal. And a position / address management unit for performing conversion. To have. In the case of the first aspect of the present invention, when an access request to the wireless terminal occurs on the network, the position / address management unit determines the physical address of the wireless terminal as the destination terminal and the positions of the wireless terminal and the wireless base station. Since the association and conversion between the information, the network layer address for connection communication, and the network layer address for connectionless communication are performed, if the originating terminal only knows one of the addresses, it can be used for a different communication system. It is possible to directly transfer a communication packet to an existing wireless terminal without going through a home agent or encapsulating.

According to a second aspect of the present invention, in the communication system of the first aspect, the location / address management unit is provided to a user who uses the wireless terminal in addition to the addresses of the wireless terminal. It is characterized in that correspondence and conversion of name addresses are performed.

In the case of the second aspect of the present invention, the location / address management unit associates and converts the name address in addition to each address of the wireless terminal. As long as the address or the user's name address is known, a communication packet can be transmitted / received to / from the destination terminal.

The third aspect of the present invention provides the first or second aspect.
In the communication system according to any one of the above, when the calling terminal that is the calling side of the wireless terminal and the other terminal knows only the network layer address for connectionless communication of the called terminal that is the communication partner. A connection corresponding to a network layer address for connectionless communication of the called terminal obtained by performing the association and conversion by the position / address management unit in response to the call setting request from the calling terminal. Call setting means for setting up a call between an access point and the called terminal by using a network layer address for communication and establishing a connection, wherein the calling terminal is provided with the call setting means of the position / address management unit. Packet communication means for communicating with the destination terminal by connectionless communication packets on the connection established by It is a symptom. In the case of the third aspect of the present invention, when the calling terminal issues a call setting request when the calling terminal knows only the network layer address for connectionless communication of the called terminal, the position / address management unit Establishes a connection between the access point and the called terminal, the calling terminal uses the connection-less communication packet on the connection set in the mobile communication network using the network layer address for connectionless communication. Communication can be performed.

The invention according to claim 4 is the invention according to claim 1 or 2.
In the communication system according to any one of the above, when the calling terminal that is the calling side of the wireless terminal and the other terminal only knows the network layer address for connection communication of the called terminal that is the communication partner, A call setting means for setting a call between the calling terminal and the called terminal by using a network layer address for connection communication of the called terminal and establishing a connection; Requesting means for notifying a network layer address for connection communication of the called terminal to perform association and conversion request, and a network layer address for connection communication of the called terminal notified from the calling terminal. The location / address management unit associates and translates the network layer address for connectionless communication of the destination terminal with the location. Using the address acquisition means acquired from the address management unit and the network layer address for connectionless communication of the called terminal acquired by the address acquisition means on the connection set by the call setting means on the connection. And a packet communication means for communicating with the side terminal by connectionless communication packets.

In the case of the invention described in claim 4, when the originating terminal knows only the network layer address for connection communication of the destination terminal, the destination terminal uses this network layer address for connection communication. In addition to establishing a connection with the destination / terminal management unit and notifying the location / address management unit of a network layer address for connection communication of the destination terminal, the location / address management unit provides a network layer for connectionless communication of the corresponding destination terminal. Since the address can be obtained, communication using the connection-less communication packet with the destination terminal can be performed on the connection using the obtained network layer address for connectionless communication of the destination terminal.

According to a fifth aspect of the present invention, in the communication system according to the second aspect, a user who uses the called terminal, which is a communication partner of the wireless terminal and the other terminal, that is, the calling terminal that is the calling side. When only the name address is known, the location / address management unit uses the called terminal obtained by performing the association and conversion with respect to the call setting request from the calling terminal. Using the network layer address for connection communication and the network layer address for connectionless communication of the called terminal corresponding to the name address of the user, call setup between the access point, the calling terminal, and the called terminal is performed. A call setting means for establishing a connection to be made, and means for notifying the calling terminal of the network layer address for connectionless communication, Using a connectionless communication packet with the destination terminal on a connection set in a mobile communication network by the call setting means using the network layer address for connectionless communication notified from the position / address management unit. It is characterized by having packet communication means for performing communication.

In the case of the invention described in claim 5, when the calling terminal knows only the name and address of the user who uses the called terminal, the position / address management unit is notified of the name and address of the called terminal. For example, since the network layer address for connectionless communication and the network layer address for connection communication of the called terminal can be obtained, the connection with the called terminal can be established using the network address for connection communication of the called terminal. The connectionless communication packet can be communicated with the destination terminal using the network address for connectionless communication on the connection set in the mobile communication network.

According to each of the above-mentioned inventions, in packet communication using IP, the transfer efficiency of communication packets can be improved as compared with IP packet communication using Mobile IP. Communication quality at the time of handoff can be improved. Smooth movement between cells can be performed. It is possible to obtain effects such as a reduction in delay time generated from the transfer path.

[0021]

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 communication system according to a first embodiment of the present invention.

In FIG. 1, 100 and 101 are wireless terminals (MS), 200 to 203 are wireless base stations, and 300 and 30.
1 is a base station controller, 400 is a position / address management unit,
401 is a switching device for mobile communication, 500, 501, 502
Is an IP terminal, 600 is the Internet, 601 is ISD
N (Integrated Services Digital Network), 700
Is a DNS (Domain Name System) server.

Here, the radio base stations 200 to 203 each have a radio terminal 100,
When 101 exists, these wireless terminals 100, 101
And a wireless base station for transmitting and receiving (communicating) data via a wireless line. The wireless terminals 100 and 101 have at least a DNS client function and DHCP (Dynamic Hosts
nfiguration Protocol) client function, location management (MM: Mobility Management) client function, and connectionless communication using network layer address (IP address) such as Internet Protocol (IP), that is, CL communication and telephone number Is a terminal that performs connection communication based on call setting in the above, that is, CO-based communication and the like. Each of the wireless terminals 100 and 101 and the IP terminals 500, 501 and 502 has at least one of an address conversion request function, an address acquisition function, and a call setting function for the position / address management unit 400.

The base station controller (BSC) 300 includes a plurality of radio base stations, for example, radio base stations (BS) 200 and 20.
1 and the like to perform base station control such as handoff control when the wireless terminal 100 performs mobile communication between the wireless base stations (BS) 200 and 201. The radio base stations (BS) 200 and 201 are the base station controller (BSC) 3
00 may be managed with the same location registration area identifier.

The base station controller (BSC) 301 is connected to a plurality of radio base stations different from the base station controller (BSC) 300, for example, the radio base stations (BS) 202 and 203, etc. ) This is a device that performs base station control such as handoff control when the wireless terminal 101 performs mobile communication between 202 and 203. A radio base station (BS) 202,
Reference numeral 203 is managed by the base station controller (BSC) 301 with the same location registration area identifier.

The mobile communication switching device 401 includes a position / address management unit 400 and a plurality of base station controllers (BSC).
300 and 301 are connected to form a mobile communication network, and between arbitrary wireless terminals (in FIG. 1, between wireless terminals 100 and 101).
This is an exchange device for realizing CO-based communication in the system. This mobile communication switching device 401 includes an Internet 600,
ISDN 601 is also connected, IP terminal 500,
CL between 501 and 502 and wireless terminals 100 and 101
An exchange process when performing system communication is also performed.

The Internet 600 is configured by connecting a plurality of router devices (not shown).
The IP packets transmitted from the routers 501 and 502 are routed (IP forwarding processing and the like) by a router device based on the IP addresses in the packets, and are networks that perform CL-based communication in a format of reaching a destination IP terminal.

The ISDN 601 is a network in which all analog signals, from telephone voice signals to facsimile image signals, are converted into digital signals and various communication services are integrated (one communication line is used to carry out various communication services by one line). Network that is to be offered under a single subscriber contract).

The DNS server 700 is a server that manages the name address of a terminal in its own area and its corresponding IP address. This DNS server 700
When the IP terminal 501 does not know the IP address corresponding to the name address of the IP terminal 502, it makes an inquiry to determine the IP address of the IP terminal 502.
This is to solve the situation where the address is unknown.

The position / address management unit 400 is configured as shown in FIG.
, The physical address (terminal identifier or MAC address) of the terminal, the location information (location registration area identifier, wireless base station identifier), and the network layer address (E.164, E.168) used for CO-based communication. Address) and a network layer address (IP address or the like) used for CL-based communication. There is also a case where the correspondence between the address and the identifier and the conversion are solved together. Also,
As shown in FIG. 3, the position / address management unit 400 stores a physical address (terminal identifier or MAC address) of a terminal.
, Location information (location registration area identifier, wireless base station identifier), network layer addresses (E.164, E.168 addresses, etc.) used for CO communication, and network layer address (IP) used for CL communication. In some cases, there is a correspondence table 21 for associating and converting an address, etc.) with a name address assigned to each user of each terminal. Further, the correspondence tables 20 and 21 are not limited to the position / address management unit 400, but may be held by a destination terminal, for example, a wireless base station. In this case, the address can be resolved without passing through the position / address management unit 400.

Hereinafter, each operation example of the communication system according to the first embodiment will be described in order with reference to FIGS.

First, a first operation example of the communication system will be described with reference to an operation sequence diagram of FIG.

In the first operation example, the originating terminal knows the CL network layer address of the called terminal, and stores the CO network layer address of the called terminal that cannot be understood by the calling terminal in the position / address management unit. Is resolved and call setting is performed.

In this case, if the originating terminal only knows the network layer address of the CL communication of the destination terminal that is the communication partner, the originating terminal can use the position / address management unit 40.
0 is notified of the network layer address of the CL communication together with the call setup request, and the position / address management unit 400 uses the notified network layer address of the CL communication to perform association and conversion of the called terminal. At least a call setup between the access point and the called terminal is performed using the CO network layer address to establish (set) a connection in the mobile communication network, and then the calling terminal and the called terminal establish a CL on the connection. Forward the packet.

That is, as shown in FIG. 4, the IP terminal 501, which is the originating terminal, first receives the position / address management unit 4
A call setting request is transmitted to 00. The call setting request in this case is performed based on the IP address of the IP terminal 501 that is the calling terminal and the IP address of the wireless terminal 100 that is the called terminal.

The position / address management unit 400 having received the call setting request uses the call setting function of the third party based on the IP address of the IP terminal 501 and the IP address of the wireless terminal 100 to perform mobile communication of the IP terminal 501. A call is set between an access point in the network and the wireless terminal 100 to establish a connection.

An IP packet is transmitted and received (communicated) between the IP terminal 501 and the wireless terminal 100 on the connection thus established.

Next, a second operation example of the communication system will be described with reference to an operation sequence diagram of FIG.

In the second operation example, the originating terminal knows the CO network layer address of the destination terminal, has a call setting function, and does not know the C of the destination terminal which cannot be understood by the originating terminal.
This is an example of a case where the position / address management unit resolves the L-system network layer address.

As described above, when the calling terminal knows only the network layer address of the CO communication of the called terminal that is the communication partner, the calling terminal sets up the call with the called terminal and sets the position / The address management unit 400 stores the C
After having the L-system network layer address resolved,
The CL packet is transferred on the connection set by using the L-system network layer address.

That is, as shown in FIG. 5, IP terminal 501 as a calling terminal first sets up a call with wireless terminal 100 as a called terminal.

Next or simultaneously, IP terminal 501 transmits a CL-system network layer address resolution request to position / address management section 400.

The position / address management unit 400 that has received the CL network layer address resolution request sends the CO network layer address (a telephone number such as E.164 or E.168) included in the CL network layer address resolution request. And retrieves the CL network layer address (IP address) of the wireless terminal 100, which is the destination terminal, with reference to the correspondence table 20, and returns a CL network layer address resolution response including this IP address (notification). I do.

IP terminal 501 that has received the CL network layer address resolution response transmits an IP packet to wireless terminal 100 using the notified IP address.

Thus, transmission and reception of IP packets between the IP terminal 501 and the wireless terminal 100 can be performed.

Next, a third operation example of the communication system will be described with reference to an operation sequence diagram of FIG.

In the third operation example, the calling terminal knows the name and address of the CL communication of the called terminal, and the position / address management unit has a third party call setting function. The side terminal notifies the position / address management unit of the name address, so that the position / address management unit sets up a call using the corresponding CO network layer address, and the CL network of the destination terminal that cannot be understood by the originating terminal. This is an example of a case where a layer address is resolved.

As described above, when the calling terminal knows only the CL-address communication name of the called terminal that is the communication partner, the position / address management unit 400 determines the name / address based on the name address notified from the calling terminal. And retrieves the CO network layer address to set up a call between the access point (AP) of the calling terminal to the mobile communication network and the called terminal by using the call setting function of the third party, and terminates the call to the calling terminal. Resolves the unknown address by responding to the CL network layer address of the side terminal, and clears the CL on the already set connection.
Forward the packet.

That is, as shown in FIG. 6, the IP terminal 501, which is the originating terminal, first receives the position / address management unit 4
00, a CL network layer address resolution request is transmitted.

The position / address management unit 4 receiving the request
00 refers to the correspondence table 21 based on the name of the wireless terminal 100 included in the CL network layer address resolution request, retrieves the CL network layer address (IP address), and includes the retrieved IP address. A network layer address resolution response is transmitted (notified) to the IP terminal 501.

Further, the position / address management unit 400
When receiving the L-system network layer address resolution request, the name address of the called terminal and the name address or IP address or CO of the calling terminal included in the request are included.
IP terminal 501 based on the system network layer address.
At least a third party sets up a call between the access point (AP) to the mobile communication network and the wireless terminal 100, and establishes a connection between the IP terminal 501 and the access point (AP) to the mobile communication network and the wireless terminal 100. Make a connection to

The IP terminal 501 receives the network layer address resolution response, and when a connection is established (when the call setup is completed), the IP address of the destination terminal included in the response is received.
An IP packet is transmitted to wireless terminal 100 based on the address.

In this manner, transmission / reception (communication) of an IP packet can be performed between the IP terminal 501 and the wireless terminal 100.

As described above, according to the communication system of the first embodiment, since the position / address management unit 400 performs the association and conversion of addresses related to networks such as the Internet 600 and ISDN 601 in an integrated manner, In the case where an access request to the cashless terminals 100 and 101 is issued, CL communication (IP address,
Name address, etc.) and CO-related communication (telephone number, etc.) can be directly associated and converted, and when communicating using Mobile IP, "improve packet transfer efficiency" and " To improve the communication quality "," perform smooth inter-cell movement ", and" reduce the delay time generated from the transfer path ".

Next, a modification of the communication system of the above embodiment will be described.

The calling terminal calls the called terminal connected to the mobile communication network, and the called terminal is called to the calling terminal by CL.
An example of transmitting a packet will be described.

For example, at least a wireless base station that transmits and receives data to and from one or more wireless terminals, and a position / address management unit that manages position information of the wireless terminals, have at least a wireless terminal and another terminal (wireless terminal or fixed terminal). In a communication system including a mobile communication network that communicates with a wireless terminal and a mobile network that is configured by connecting a wireless base station that transmits and receives data to and from a wireless terminal and a router device, the originating terminal has an IP address.
When the terminal 500 is the wireless terminal 100 and the destination terminal is the wireless terminal 100, and the communication is performed by a CL packet (a network layer packet such as an IP packet), the IP terminal 500 that is the calling terminal is the wireless terminal 100 of the communication partner. Knows the CO network layer address (E.164, E.168, etc.) or the name address or the CL network layer address of the wireless terminal 100 via the mobile communication network.
0 notifies the IP terminal 500 of the IP address of the wireless terminal 100 by notifying the IP terminal 500 of the own terminal.
The IP terminal 500 notifies the wireless terminal 1
Transmission and reception (communication) of the CL packet with the wireless terminal 100 through the mobile network using the IP address notified from 00.
Perform

As a result, it is possible to improve the communication quality at the time of handoff and realize smooth inter-cell movement.

Next, a communication system according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing the configuration of the communication system according to the second embodiment of the present invention.

In FIG. 7, 110 and 111 are radio terminals, 210 to 213 are radio base stations, 310 and 311 are mobile communication networks, 410 is a location / address management unit, 411 is a service access point, 510, 511 and 512 are I
P terminal, 610 is the Internet, 611 is ISDN
(Intepted Services Digital Network), 710 is D
An NS (Domain Name System) server.

[0062] Here, the radio base stations 210 to 213 establish the radio terminal 110,
When 111 exists, these wireless terminals 110, 111
And a wireless base station for transmitting and receiving (communicating) data via a wireless line. The wireless terminals 110 and 111 have at least a DNS client function and DHCP (Dynamic Hosts
nfiguration Protocol) Client function, location management M
M: Mobility Management) It has a client function, and connectionless communication using a network layer address (IP address) such as Internet Protocol (IP), that is, CL communication, connection communication by call setting with a telephone number, etc. That is, it is a terminal that performs CO communication and the like. The mobile communication network 310 includes a plurality of radio base stations 21
0, 211, and is a backbone of mobile communication for performing base stations such as handoff control when the wireless terminal 110 or 111 moves between the wireless base stations 210, 211. The mobile communication network 311 connects the plurality of wireless base stations 212 and 213 and
It is a backbone of mobile communication for performing a base station or the like for handoff control or the like when the wireless terminal 111 or the wireless terminal 110 moves between the three terminals.

The service access point 411 includes a location / address management unit 410, mobile communication networks 310 and 311,
The Internet 600, ISDN 611, etc. are connected in an aggregated manner, and IP terminals 510, 511, 512
This is a network integration connection device that performs a connection process when performing communication between the wireless terminal 110 and the wireless terminal 110, and a switching process as necessary.

The Internet 610 is configured by connecting a plurality of router devices (not shown),
An IP packet transmitted from the LAN 512 or the like is routed (IP forwarding processing or the like) by a router device based on the IP address in the packet, and is a network for performing connectionless communication in a form of reaching a destination terminal, that is, CL-based communication. It is.

The ISDN 611 is a network which converts all analog signals from telephone voice signals to facsimile image signals into digital signals and integrates various communication services. Network that is to be offered under a single subscriber contract).

[0066] The DNS server 710 is a server that manages the name addresses of terminals in its own jurisdiction area and the corresponding IP addresses. If the IP terminal 511 does not know the IP address corresponding to the name address of the IP terminal 512, the DNS server 710 can be used to resolve the unknown IP address problem of the IP terminal 512, that is, to know the IP address. . It is assumed that the correspondence tables 20, 21 shown in FIGS. 2 and 3 are set in the position / address management unit 410.

In the case of the communication system of the second embodiment,
As compared with the configuration of the communication system according to the first embodiment (see FIG. 1), a service access point 411 is provided in a higher-level network.
By connecting the position / address management unit 410 to the address, it is possible to perform correspondence and conversion of addresses for all networks accommodated in the service access point 411. That is, ISDN 611, Internet 6
10. Address conversion of any combination of the mobile communication networks 310 and 311 can be performed.

As described above, according to the communication system of the second embodiment, in addition to the first embodiment, the association and conversion of the addresses of all the networks accommodated in the service access point 411 are performed, so that the packet transfer is performed. To obtain effects that can further improve efficiency, improve communication quality at the time of handoff, can perform smooth inter-cell movement, can reduce delay time generated from a transfer path, and the like. Can be.

In the communication system according to the second embodiment, the service access point 411 has the ISDN 61
1. Internet 610, mobile communication network 310, 311
Is shown, but when accommodating another network, it can be extended to a configuration that can also be converted to an address of that network.

Further, the service access point 411
Has a function to convert different transmission methods, encoding methods, etc. in each network, and a function to determine which other service access point on the network to connect to. Is also good.

Further, depending on the communication quality required for the communication application when performing the CL packet communication between the IP terminal 511 and the wireless terminal 110, the communication sequence shown in each operation example of the first embodiment may be combined. Alternatively, the configuration may be such that an appropriate access method is selected from a plurality of communication sequences.

[0072]

As described above, according to the present invention, the physical address of the radio terminal, the location information of the radio terminal and the radio base station, the network layer address for connectionless communication, and the network layer address for connection communication are obtained. By providing a position / address conversion unit for performing correspondence and conversion, and taking a communication sequence as shown in each of the above-described embodiments, Mobi is used for communication using IP.
le Compared to connectionless communication using IP, the transfer efficiency of communication packets can be improved, the communication quality at the time of handoff can be improved, smooth inter-cell movement can be performed, It is possible to obtain effects such as reduction of the generated delay time.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing an example of a correspondence table set in a position / address management unit of the communication system according to the first embodiment.

FIG. 3 is an exemplary view showing another example of the correspondence table set in the position / address management unit of the communication system according to the first embodiment;

FIG. 4 is a sequence chart showing a first operation example of the communication system.

FIG. 5 is a sequence chart showing a second operation example of the communication system.

FIG. 6 is a sequence chart showing a third operation example of the communication system.

FIG. 7 is a diagram showing a configuration of a communication system according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a conventional communication system using Mobile IP.

[Explanation of symbols]

100, 101, 110, 111 ... wireless terminal (MS),
200, 201, 202, 203, 210, 211, 2
12, 213 base station (BS) 300, 301 base station controller (BSC), 310, 311 mobile communication network, 4
00, 410: location / address management unit, 401: mobile communication switching device, 402: foreign network, 403: Hom
e Network, 411: Service access point, 50
0, 501, 502, 510, 511, 512: IP terminal, 600, 610: Internet, 601, 611
... ISDN, 700, 710 ... DNS server.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04Q 7/04 C

Claims (5)

[Claims] 1. A communication in which a wireless terminal accommodated in a wireless base station connected to a network and another wireless terminal or a fixed terminal connected to the network perform connectionless communication or connection communication through the network. In the system, when an access request to at least the wireless terminal occurs on the network, a physical address of the wireless terminal obtained from a wireless base station that accommodates the wireless terminal,
A position / address management unit that performs correspondence and conversion between position information of the wireless terminal and the wireless base station, a network layer address for connectionless communication of the wireless terminal, and a network layer address for connection communication of the wireless terminal. A communication system comprising: 2. The communication system according to claim 1, wherein the position / address management unit associates a name address assigned to a user who uses the wireless terminal in addition to the addresses of the wireless terminal. And a conversion system. 3. The communication system according to claim 1, wherein a calling terminal of the wireless terminal and the other terminal, which is a calling terminal, is a connection terminal of a called terminal that is a communication partner. When only the network layer address is known, the location / address management unit performs the association and conversion with respect to the call setting request from the calling terminal to obtain the connectionless connection of the called terminal. A call setting unit for setting up a call between an access point and the called terminal by using a network layer address for connection communication corresponding to a network layer address for communication and establishing a connection, wherein the calling terminal comprises: Performs communication using a connectionless communication packet with the destination terminal on a connection established by the call setting means of the position / address management unit. Communication system characterized by comprising a packet communication means. 4. The communication system according to claim 1, wherein a calling terminal of the wireless terminal and the other terminal, which is a calling terminal, is a communication terminal of a called terminal that is a communication partner. Call setting means for setting up a call and establishing a connection with the called terminal using a network layer address for connection communication of the called terminal when the calling terminal knows only the layer address. Requesting means for notifying the location / address management unit of a network layer address for connection communication of the called terminal and performing association and conversion request; and the called terminal notified from the calling terminal. Location / network layer address for connection communication
Address acquisition means for acquiring, from the position / address management section, a network layer address for connectionless communication of the called terminal to which the address management section has associated and converted, and the called side acquired by the address acquisition means. Packet communication means for communicating with the destination terminal by connectionless communication packets on the connection set by the call setting means using a network layer address for connectionless communication of the terminal. Communications system. 5. The communication system according to claim 2, wherein, of the wireless terminal and the other terminal, the calling terminal that is the calling side recognizes only the name and address of the user who uses the called terminal that is the communication partner. The location / address management unit, in response to a call setting request from the calling terminal, corresponds to the name and address of a user who uses the called terminal obtained by performing the association and conversion. Call setting means for setting up a call between an access point and the called terminal by using a network layer address for connection communication and a network layer address for connectionless communication of the called terminal to make a connection, and Means for notifying the side terminal of the network layer address for connectionless communication, wherein the calling side terminal is Packet communication means for performing communication by a connectionless communication packet with the destination terminal on a connection established by the call setting means by using the notified network layer address for connectionless communication. Communication system.