JP2003348232A - Roaming network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roaming network system attaining roaming service between a plurality of networks without utilizing specific technology. <P>SOLUTION: At the time of moving from an area which is taken charge of by a home device 111 to an area which is taken charge of by a roamer device 112, a PHS terminal (PS1) 151 sends a RRQ signal to the roamer device 112 through a PHS base station 132 and a GW 142. The roamer device 112 allows the call control of the PHS terminal 151 and transmits an LRQ signal including a roaming information message indicating that the PHS terminal 151 is call-controlled by the roamer device 112 by using a multi-cast. Since the home device 11 is a gate keeper for managing the PHS terminal 151, the home device 111 judges the execution of roaming on the basis of the roaming information message and returns an LCF signal to the roamer device 112. The roamer device 112 performs the roaming of the PHS terminal 151. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a roaming network system using a communication terminal such as a PHS.
In particular, the present invention relates to a roaming network system that enables a roaming service of a communication terminal.

[0002]

2. Description of the Related Art H.264 standardized by ITU (International Telecommunication Union). The H.323 Recommendation stipulates rules for address conversion and access control by a gatekeeper (hereinafter referred to as "GK") on a VoIP network for an endpoint on a VoIP network.

[0003] In order to search for a GK that registers information of the own endpoint, an endpoint on the VoIP network sends an R to the GK on the VoIP network.
Send an RQ (registration request) signal. The GK receives the RRQ signal, performs registration processing if registration is possible with its own GK, and returns an RCF (registration acceptance) signal notifying the fact to the endpoint. The endpoint receiving the RCF signal communicates with another endpoint through the GK.

Each G on such a VoIP network
K is associated with a base station of a communication terminal such as a PHS corresponding to an endpoint via a gateway (hereinafter, referred to as “GW”), and a PHS protocol (RCR S
By performing protocol conversion between TD-28) and VoIP, a roaming network system using a PHS can be constructed in a VoIP network.

[0005]

However, the conventional VoI
In the P technology, there is no means for providing a roaming service between all PHS base stations connected to different GKs. As a countermeasure for this, there is a method in which a dedicated TCP connection is fixedly established between all GKs that can roam with each other, and roaming notification processing using the Qsig (JT-Q931a) protocol is performed. .

However, when this method is adopted,
Since it is necessary to implement a special program for the Qsig protocol in all GKs and register all opposing GKs in advance in each GK, system design and development costs increase and scalability decreases. There was a problem of doing.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a roaming network system which enables a roaming service between a plurality of networks without using a special technique. is there.

[0008]

In order to achieve the above object, a roaming network system according to the present invention comprises:
A first gatekeeper that manages assigned communication terminals and has terminal information of each assigned communication terminal, and accepts registration in response to a registration request from a communication terminal assigned to the first gatekeeper. And a second gatekeeper that enables call control for the communication terminal, and has been moved from an area managed by the first gatekeeper to an area managed by the second gatekeeper. The second gatekeeper that has registered the communication terminal transmits an LRQ signal including a roaming notification message to other gatekeepers including the first gatekeeper by multicast, and the first gatekeeper receiving the LRQ signal Determines that roaming is to be performed based on the roaming notification message included in the LRQ signal, Transmitting the LCF signal responsive to LRQ signal to the second gatekeeper.

Thus, even when the communication terminal managed by the first gatekeeper moves to the area of the second gatekeeper, the second gatekeeper receiving the registration request from the communication terminal, An LRQ signal including a roaming notification message is transmitted by multicast to other gatekeepers including the first gatekeeper, and the first gatekeeper determines that roaming is to be performed based on the roaming notification message of the LRQ signal. At this time, the first
Transmits a LCF signal to the second gatekeeper in response to the LRQ signal received from the second gatekeeper, and thus provides a roaming service between the plurality of gatekeepers to the communication terminal. be able to.

[0010] Further, the roaming network system according to the present invention manages assigned communication terminals, and assigns a first gatekeeper having terminal information of each assigned communication terminal to the first gatekeeper. And a second gatekeeper that enables call control for the communication terminal by accepting registration in response to a registration request from the communication terminal that has been registered, from a region managed by the first gatekeeper. A second registered communication terminal that has moved to an area managed by the second gatekeeper;
The gatekeeper transmits an LRQ signal to other gatekeepers including the first gatekeeper by multicast, and the first gatekeeper that has received the LRQ signal transmits an LCF signal responsive to the LRQ signal to the other gatekeeper. When sent to a second gatekeeper, the second gatekeeper sends a roaming notification message to the first gatekeeper.

Thus, even when the communication terminal managed by the first gatekeeper moves to the area of the second gatekeeper, the second gatekeeper receiving the registration request from the communication terminal, An LRQ signal is multicast-transmitted to other gatekeepers including the first gatekeeper. Since the first gatekeeper is a gatekeeper that manages the communication terminal that has transmitted the LRQ signal, an LCF signal responding to the LRQ signal is transmitted. To the second gatekeeper, and the second gatekeeper sends a roaming notification message to the first gatekeeper, so that the plurality of gatekeepers can mutually provide a roaming service to the communication terminal. it can. In addition, since the LRQ signal transmitted from the second gatekeeper does not include the roaming notification message and the roaming notification message is transmitted to the gatekeeper that transmitted the LCF signal, a special protocol must be used. Roaming service can be started.

Further, in the roaming network system according to the present invention, the LRQ signal includes terminal information on the communication terminal and information on the second gatekeeper.

Further, in the roaming network system according to the present invention, the roaming notification message is a message indicating that the communication terminal is under call control by the second gatekeeper.

Further, in the roaming network system according to the present invention, gatekeepers other than the first gatekeeper receiving the LRQ signal ignore the LRQ signal.

Further, in the roaming network system according to the present invention, when the communication terminal makes a call to another communication terminal registered with the first gatekeeper, the roaming network system transmits the second communication terminal.
Are in communicative connection with the first gatekeeper.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a roaming network system according to the present invention will be described in detail in the order of [first embodiment] and [second embodiment] with reference to the drawings.

[First Embodiment] FIG. 1 shows a system configuration diagram and a sequence chart of a roaming network system according to a first embodiment. As shown in the figure, the roaming network system 10 of the present embodiment
0 indicates that the base stations (CS) 131 and 132 correspond to the gatekeepers (hereinafter referred to as “GKs”) 111, 112 and 113 on the VoIP network 101, and the base stations (CS) 131 and 132 perform wireless communication. The communication terminals (PS) in the area are assigned to the GKs 111, 112, and 113, respectively. Each base station (CS) 131,1
Reference numeral 32 denotes a VoIP network 1 via gateways (hereinafter, referred to as “GWs”) 141 and 142, respectively.
01 is connected. Each GK 111, 112, 113
The terminal information (telephone number, IP address, etc.) of the communication terminal (PS) assigned to the own GW is registered.

The roaming network system 10
The sequence of 0s is as follows. Here, the GK111 corresponding to the first gatekeeper in the claims is described.
Is the home device (home), the GK 112 corresponding to the second gatekeeper is a roamer device,
113 is described as another GK. Reference numeral 151 in FIG. 1 denotes a communication terminal (PS1) assigned to the home device 111, which is a PHS terminal in the present embodiment. Therefore, the communication terminal is hereinafter referred to as PHS terminal 1
Notated as 51. Note that the PHS terminal (PS1) 151 is a device corresponding to an endpoint conforming to RCR STD-28, and the GWs 141 and 142 are H.264. This is a device corresponding to an endpoint conforming to the H.323 Recommendation.

First, when the PHS terminal (PS1) 151 is located in the wireless communication area covered by the home device 111, the PHS base station (CS) 131 and the GW 14
1, an RRQ (registration request) signal is sent to the home device 111. Home device 111 receives the RRQ signal, performs registration processing if registration is possible with its own GK, and transmits an RCF (registration acceptance) signal notifying the fact to PHS.
It returns to the terminal (PS1) 151.

The PHS terminal (PS) receiving the RCF signal
1) 151 communicates with another terminal (PH) through the home device 111
(Endpoint such as S terminal). When the PHS terminal (PS1) 151 moves from the wireless communication area covered by the home device 111 to the wireless communication area covered by the roamer device 112, the PHS base station 132 of the movement destination
And an RRQ signal is sent to the Roamer device 112 via the GW 142.

The Romer device 112 receives the RRQ signal, performs registration processing if it can be registered by itself, and performs PH processing.
Call control for the S terminal (PS1) 151 is enabled, and an RCF signal notifying the fact is transmitted to the PHS terminal (PS1).
1) Return to 151. Further, the Romer device 112
Provides PHS to home device 111 and other GKs 113.
The terminal (PS1) 151 multicast-transmits an LRQ signal including a roaming notification message indicating that the call is controlled by the Roman device 112. The LR
The Q signal is ignored by the GK 113 other than the home device 111.

The home device 111 includes a Roamer device 112.
Is determined to be the PHS terminal (PS1) 151 managed by the own device based on the roaming notification message included in the LRQ signal received from the PHS terminal (PS
1) The LCF signal including the end point management information of 151 is returned to the Roman device 112. Home device 111
Is the PHS terminal (P
S1) Register the end point position information of 151 in its own device, and perform roaming control to the PHS terminal (PS1) 151.

Next, referring to FIG.
PHS terminal (PS
1) A calling method for 151 will be described. Reference numeral 161 in FIG. 2 denotes a calling IP phone, and reference numeral 171 denotes a GK for call-controlling the calling IP phone 161.

The calling IP telephone 161 is connected to a PHS terminal (P
S1) An ARQ signal for calling 151 is sent to GK171.
Send to When receiving the ARQ signal, the GK 171 receives the home device 111, the Roamer device 112, and the other GK 11
Then, an LRQ signal is multicast-transmitted to the third terminal. In this case, the home device 111 includes the PHS terminal (PS1) 151
Knows that the caller is under the call control of the Romer device 112, and responds to the LRQ signal and sends the LCF signal to the caller I.
Return to GK171 of P-phone 161. The LCF signal is
PHS terminal (PS1) under call control of home device 111
151 is notified of the end point position information (IP address).

When the GK 171 receives the LCF signal,
An ACF signal notifying the IP address of the PHS terminal (PS1) 151 is transmitted to the calling IP telephone 161. The calling side IP telephone 161 transmits a setup signal (Setup) requesting a connection to the notified IP address to the home device 111. Upon receiving the setup signal, home device 111 establishes a connection with calling IP phone 161. Then, the calling side IP telephone 161
After returning a reception signal (CallProc) corresponding to the setup signal, the setup signal (Setu) requesting the PHS terminal (PS1) 151 to set up to the IP address.
p) is transferred to the Romer device 112.

Upon receiving the setup signal, the Romer device 112 establishes a connection with the home device 111. Then, after returning a reception signal (CallProc) corresponding to the setup signal to the home device 111, it transmits the setup signal (Setup) to the GW 142. GW14
When receiving the setup signal, the calling IP telephone 1
Establish connection with 61. Then, a reception signal (Call
Proc), and then returns to the PHS via the PHS base station 132.
The terminal (PS1) 151 is called. In response to this call, the PHS terminal (PS1) 151 receives a call, and the VoIP between the calling IP phone 161 and the PHS terminal (PS1) 151.
Can be used.

As described above, according to the roaming network system of this embodiment, a roaming service can be provided between a plurality of gatekeepers. In addition, since special software such as QsigOverIP is not required, development resources at the time of design / development can be reduced, and since a dedicated TCP connection is not required, it is possible to use an extra gatekeeper TCPSocket or the like. Absent. Furthermore, since it is not necessary to register a communication terminal in each gatekeeper in advance, it is possible to reduce complicated work and processing when expanding the system.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
An embodiment will be described. FIG. 3 shows a system configuration diagram and a sequence chart of the roaming network system of the second embodiment. This roaming network system 200 has the system configuration shown in FIG.
Same as but with a different sequence.

The sequence of the roaming network system 200 of the present embodiment is as follows. First, P
When the HS terminal (PS1) 151 moves from the wireless communication area covered by the home device 111 to the wireless communication area covered by the roamer device 112, the HS terminal (PS1) 151 passes through the PHS base station 132 and the GW 142 of the movement destination.
To the RRQ signal.

The Romer device 112 receives the RRQ signal, performs registration if it can be registered by itself, and performs PH processing.
Call control for the S terminal (PS1) 151 is enabled, and an RCF signal notifying the fact is transmitted to the PHS terminal (PS1).
1) Return to 151. Further, the Romer device 112
Provides PHS to home device 111 and other GKs 113.
The terminal (PS1) 151 multicast-transmits an LRQ signal for position resolution. This LRQ signal is ignored by the GK 113 other than the home device 111.

The home device 111 is a Roman device 112.
The LCF signal responding to the LRQ signal received from the device is returned to the Roman device 112. The LCF signal notifies end position information (IP address) of the PHS terminal (PS1) 151 under the call control of the home device 111. Upon receiving the LCF signal, the roamer device 112 transmits a setup signal (Setup) requesting a connection to the home device 111. Home device 1
11 receives the setup signal and establishes a connection with the Romer device 112. Then, the reception signal (Call
After returning Proc), a connect signal (connect) indicating that the connection between them has been established is transmitted.

Upon receiving the connect signal, the roaming device 112 transmits a roaming notification message (Facility) to the home device 111 indicating that the PHS terminal (PS1) 151 is call-controlled by the roaming device 112. After registering the information notified by the roaming notification message in the home apparatus 111, the home apparatus 111 transmits a signal (RealComp) indicating that the registration is completed to the roaming apparatus 11.
Reply to 2.

Next, referring to FIG.
PHS terminal (PS
1) A calling method for 151 will be described. As in FIG. 2, reference numeral 161 in FIG. 4 denotes a calling IP telephone, and reference numeral 171 denotes a GK for call-controlling the calling IP telephone 161.

The calling IP telephone 161 is connected to a PHS terminal (P
S1) An ARQ signal for calling 151 is sent to GK171.
Send to When receiving the ARQ signal, the GK 171 receives the home device 111, the Roamer device 112, and the other GK 11
Then, an LRQ signal is multicast-transmitted to the third terminal. In this case, the home device 111 includes the PHS terminal (PS1) 151
Knows that the caller is under the call control of the Romer device 112, and responds to the LRQ signal and sends the LCF signal to the caller I.
Return to GK171 of P-phone 161. The LCF signal is
PHS terminal (PS1) under call control of home device 111
151 is notified of the end point position information (IP address).

When the GK 171 receives the LCF signal,
An ACF signal notifying the IP address of the PHS terminal (PS1) 151 is transmitted to the calling IP telephone 161. The calling side IP telephone 161 transmits a setup signal (Setup) requesting a connection to the notified IP address to the home device 111. Upon receiving the setup signal, home device 111 establishes a connection with calling IP phone 161. Then, the calling side IP telephone 161
After returning a reception signal (CallProc) corresponding to the setup signal, the setup signal (Setu) requesting the PHS terminal (PS1) 151 to set up to the IP address.
p) is transferred to the Romer device 112.

When the setup device 112 receives the setup signal, it establishes a connection with the home device 111. Then, after returning a reception signal (CallProc) corresponding to the setup signal to the home device 111, it transmits the setup signal (Setup) to the GW 142. GW14
When receiving the setup signal, the calling IP telephone 1
Establish connection with 61. Then, a reception signal (Call
Proc), and then returns to the PHS via the PHS base station 132.
The terminal (PS1) 151 is called. In response to this call, the PHS terminal (PS1) 151 receives a call, and the VoIP between the calling IP phone 161 and the PHS terminal (PS1) 151.
Can be used.

As described above, according to the roaming network system of this embodiment, a roaming service can be provided between a plurality of gatekeepers. Also, unlike the first embodiment, the Romer device 1
The LRQ signal sent by multicast from No. 12 does not include a roaming notification message (Facility).
Since a roaming notification message (Facility) is sent to the roamer device that has transmitted the LRQ signal, a roaming service can be provided without using a special protocol.

[0038]

As described above, according to the roaming network system according to the present invention, the communication terminal
A roaming service can be provided among a plurality of gatekeepers.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration diagram and a sequence chart of a roaming network system according to a first embodiment.

FIG. 2 is a sequence chart when a call is made in the roaming network system according to the first embodiment;

FIG. 3 is a system configuration diagram and a sequence chart of a roaming network system according to a second embodiment;

FIG. 4 is a sequence chart when a call is made in the roaming network system according to the second embodiment;

[Explanation of symbols]

100,200 roaming network system 101 VoIP network 111 Home device 112 Romer device 113 other gatekeepers 131,132 PHS base station 141, 142 gateway 151 PHS terminal (PS1) 161 Calling IP Phone 171 Calling IP Phone Gatekeeper

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 5K030 GA19 HA08 HC01 HD03 JL01                       JT09 LB01                 5K033 AA01 AA09 CB08 DA05 DA17                       DB18 EA06 EC02 EC03                 5K051 AA01 BB01 CC07 CC11 DD15                       FF01 FF16 HH02 HH12 HH13                       HH15 HH17 KK01                 5K067 AA21 BB04 BB21 CC08 DD11                       DD57 EE02 EE10 EE16 HH11                       HH22 JJ71 JJ76

Claims (6)

[Claims] 1. A first gatekeeper that manages assigned communication terminals and has terminal information of each assigned communication terminal, and a registration request from a communication terminal assigned to the first gatekeeper. By accepting registration for
A second gatekeeper that enables call control for the communication terminal, wherein the second gatekeeper is located in an area managed by the first gatekeeper.
The second gatekeeper that has registered the communication terminal that has moved to the area managed by the gatekeeper of the second gatekeeper transmits an LRQ signal including a roaming notification message to other gatekeepers including the first gatekeeper by multicasting, The first gatekeeper that has received the LRQ signal determines that roaming is to be performed based on a roaming notification message included in the LRQ signal, and
A roaming network system comprising: transmitting an LCF signal responsive to a Q signal to the second gatekeeper. 2. A first gatekeeper that manages assigned communication terminals and has terminal information of each assigned communication terminal, and a registration request from a communication terminal assigned to the first gatekeeper. By accepting registration for
A second gatekeeper that enables call control for the communication terminal, wherein the second gatekeeper is located in an area managed by the first gatekeeper.
The second gatekeeper that has registered the communication terminal that has moved to the area managed by the gatekeeper transmits an LRQ signal to other gatekeepers including the first gatekeeper by multicast, and receives the LRQ signal. When the first gatekeeper sends an LCF signal responsive to the LRQ signal to the second gatekeeper, the second gatekeeper sends a roaming notification message to the first gatekeeper. Roaming network system characterized. 3. The roaming network system according to claim 1, wherein the LRQ signal includes terminal information of the communication terminal and information on the second gatekeeper. 4. The roaming network system according to claim 1, wherein the roaming notification message is a message indicating that the communication terminal is under call control by the second gatekeeper. . 5. The roaming network system according to claim 1, wherein a gatekeeper other than the first gatekeeper receiving the LRQ signal ignores the LRQ signal. 6. When the communication terminal calls another communication terminal registered in the first gatekeeper, the second gatekeeper makes a communication connection with the first gatekeeper. The roaming network system according to claim 1, 2, 3, 4, or 5, wherein