JP2000059838A - Hand-over method bridging over phs connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-over method bridging over a PHS connector where communication is continued even when a PHS terminal moves to a service area of a radio base station contained in a different PHS connector. SOLUTION: In this hand-over method, in the case that a PHS terminal 7 in a service area 1b moves to an adjacent service area 1c of a different PHS connector 3b and makes a hand-over request to the PHS connector 3b via a radio base station 2c, the PHS connector 3b forms a new path 103a up to a first PHS connector 3a via a network 4, the first PHS connector 3a connects the new path 103a to a first path from a telephone terminal 6 to the first PHS connector 3a via the network 4, the PHS terminal 7 continues communication with the telephone terminal 6 via the PHS connector 3b, the new path 103a, the first PHS connector 3a and the first path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PHS terminal which is located in a service area having a service area configured for each radio base station connected to a PHS connection apparatus.
The present invention relates to a handover method over a PHS connection device that performs handover when the mobile terminal moves to a different service area of an S connection device.

[0002]

2. Description of the Related Art As shown in FIG. 13, a PHS (Personal Handy Phone System) divides an entire service providing area into a plurality of service areas 1a to 1d, and each of the plurality of service areas is wirelessly provided. Base station (C
S) 2a to 2d are installed, respectively, and a plurality of these radio base stations (CS) 2 are collectively connected to one PHS connection device 93. That is, in FIG. 13, a plurality of radio base stations (CS) 2a and 2b are connected to one PHS connection device 93a, and a plurality of radio base stations (CS) 2a and 2b are connected.
c and 2d are connected to one PHS connection device 93b. These PHS connection devices 93 are connected to a network (NW) 4 including a public switched network, and this network (NW) 4 has a subscriber line switch (L) for a general telephone line.
S) A general telephone terminal 6 is connected via 5.

In FIG. 13, a PHS terminal 7 located in a service area 1a wirelessly connects to a radio base station (CS) 2a of the service area 1a as indicated by a thick solid line 98, and ) 2a to PHS connection device 93
a, network (NW) 4, subscriber line exchange (LS)
5 and a telephone terminal 6. Then, as shown by the arrow 99, the PHS terminal 7
a, the service area 1b is moved from the wireless base station (CS) 2a of the service area 1a before the movement to the adjacent service area 1b.
Is connected to the same PHS connection device 93a, a path for the moved PHS terminal 7 is formed from the PHS connection device 93a to the PHS terminal 7 via the radio base station (CS) 2b as shown by a dotted line 100, PHS terminal 7
Can continue to connect to the previous telephone terminal 6 even in the new service area 1b that has moved.

When the PHS terminal 7 that has moved to the service area 1b moves to the next adjacent service area 1c as shown by a dotted line 101, the service area 1c becomes its radio base station (CS) 2c. Is the PHS of the radio base station (CS) 2b in the service area 1b before moving.
Since the connection is made to the PHS connection device 93b different from the connection device 93a, a path to the moved PHS terminal 7 cannot be formed, and the PHS terminal 7 and the telephone terminal 6 cannot communicate with each other.

[0005]

As described above, in the conventional PHS, when a communicating PHS terminal moves from a service area in a service area to a service area of a radio base station connected to a different PHS connecting device, There is a problem that the ongoing communication is cut off, the communication cannot be continued, and the continuity of the service area is low.

[0006] The present invention has been made in view of the above,
It is an object of the present invention to provide a handover method over a PHS connection device that can continue communication even when a PHS terminal moves to a service area of a radio base station accommodated in a different PHS connection device.

[0007]

To achieve the above object, according to the present invention, there is provided a PHS connecting apparatus for performing a handover between different service areas.
A handover method over an S connection device, wherein a PHS terminal located in a certain service area is a radio base station,
In a state where the PHS terminal is connected to another PHS terminal or another terminal including a fixed telephone terminal via a network, the PHS terminal may
Move to another service area with a different S connection device,
When a handover request is made from the HS terminal to the different PHS connection device via the radio base station,
The S connection device makes a new path to the first PHS connection device via the network in response to the handover request, and the first connection from the other terminal to the first PHS connection device via the network. A path and the new path are connected at the first PHS connection device, whereby the PHS terminal communicates with the other terminal via the different PHS connection device, the new path, the first PHS connection device, and the first path. The point is to continue the connection.

[0008] In the first aspect of the present invention, the PHS
When the terminal moves to another service area of the PHS connection device and makes a handover request, the different PHS
The connection device causes a new path to be formed through the network to the first PHS connection device, and the first PHS connection from another terminal is made.
First PHS to new path and first path to connected device
Connect at the connection device, which allows the PHS terminal to connect to a different PHS connection device, a new path, the first PHS connection device,
To continue connecting with other devices via the first pass,
Communication can be continued even if the mobile terminal moves to a service area of a wireless base station connected to a different PHS connection device.

Further, the present invention described in claim 2 is based on claim 1.
In the invention described in the above, the PHS terminal located in the other service area different from the PHS connection device is a PHS terminal.
Move to a different service area of the connection device, and
When a handover request is made from the S terminal to the further PHS connection device via the radio base station, the further PHS connection device responds to the handover request and sends a new request to the first PHS connection device via the network. A first path connected from the other terminal to the first PHS connection device via a network and the new path in the first PHS connection device, and the PHS terminal Is a different P
HS connection device, new path, first PHS connection device, continue connection with the other terminal via the first path, new connection from the different PHS connection device to the first PHS connection device via the network The gist is to release the pass.

[0010] According to the second aspect of the present invention, the PHS
PHS residing in another service area with a different connection device
When the terminal moves to a different service area of the PHS connection device and makes a handover request, the different PH
The S connection device causes a new path to be formed to the first PHS connection device, connects the first path from another terminal to the first PHS connection device and the new path at the first PHS connection device, and Is another PHS connection device,
New path, first PHS connection device, to continue the connection with other terminals via the first path, to release a new path from the different PHS connection device to the first PHS connection device through the network, Communication can be continued even if the PHS terminal moves between service areas of different PHS connection devices one after another.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram for implementing a handover method across a PHS connection device according to an embodiment of the present invention. 13, the same components as those described with reference to FIG. 13 are denoted by the same reference numerals, but only the PHS connection device has a different function, configuration, and the like in order to perform the method of the present embodiment. Symbols 3a and 3 of
This is indicated by b.

That is, in the system configuration of FIG. 1, the PHS connection devices 3a, 3b connected to the network (NW) 4
3b includes a plurality of radio base stations (CS) 2a and 2b, respectively.
And a plurality of radio base stations (CS) 2c and 2d. Each radio base station (CS) 2a, 2b, 2c, 2d
Are installed in service areas 1a, 1b, 1c and 1d, respectively. Further, a telephone terminal 6 is connected to the network (NW) 4 via a local exchange (LS) 5.

In the state shown in FIG. 1, the telephone terminal 6 is connected to a PHS connection device 3a from a local exchange (LS) 5 through a network (NW) 4 as shown by a thick solid line 103.
The PHS connection device 3a is connected to the network (NW) 4, the PHS connection device 3b,
A state in which the terminal is connected to the PHS terminal 7 in the service area 1c via the radio base station (CS) 2c is shown. This connection state indicates that the PHS terminal 7 is in the previous service area 1
The connection state after the handover after moving from b to the adjacent service area 1c as shown by the arrow 105 is shown. Such handover from the service area 1b to the service area 1c is performed by the radio base station (CS) of the service area 1b.
2b is connected to the PHS connecting device 3a to which the radio base station (CS) 2c of the service area 1c is connected.
The radio base station (CS) 2 which is different from the HS connection device 3b and is thus connected to the different PHS connection device 3
In the past, handover between service areas 1 has not been possible, but in the present embodiment, handover is possible by returning a path with the PHS connection device 3a.

To explain this handover in more detail, the PHS terminal 7 is initially located in the service area 1b, and as shown by the dotted line 104, the radio base station (CS) 2b
Is connected to the PHS connection device 3a via the
The communication terminal 3 is connected to the telephone terminal 6 via the network (NW) 4 and the local exchange (LS) 5 from the connection device 3a, thereby performing communication with the telephone terminal 6. When the PHS terminal 7 moves from the located service area 1b to the adjacent service area 1c, the PHS terminal 7 automatically calls the radio base station (CS) 2c of the service area 1c and issues a handover request. . Upon receiving the handover request, the radio base station (CS) 2c transmits the handover request to the PHS connection device 3.
b. The PHS connection device 3b performs PHS via the network (NW) 4 based on the handover request.
A new path to the connection device 3a is formed as shown by the thick line 103a. Since the first path from the telephone terminal 6 to the PHS connection apparatus 3a via the local line exchange (LS) 5 and the network (NW) 4 extends to the PHS connection apparatus 3a, this first path is indicated by 103a. New path to P
By connecting in the HS connection device 3a, the PHS terminal 7 that has moved to the adjacent service area 1c passes through the new path and the first path, that is, the radio base station (CS).
2c, PHS connection device 3b, network (NW) 4
(New path 103a), PHS connection device 3a, network (NW) 4 (first path), local exchange (L
S) The connection to the telephone terminal 6 is made via 5 and communication with the telephone terminal 6 can be continued.

Next, the above-mentioned handover processing operation will be described in detail with reference to the sequence diagram shown in FIG. In FIG. 2, reference numeral 11 denotes a service access point (SAP), which is a node having a service execution control function for realizing an advanced telephone service, and to a PHS service control station (NSP) 13 described below. It is a point to access.
A PHS service control station (NSP) 13 is a control station that performs various service controls related to PHS, and 15 is a relay station (ZC). In FIG. 2, the service access point
Int (SAP) 11 and relay station (ZC) 15 are shown in FIG.
Corresponding to the network (NW) 4.

In FIG. 2, a PHS terminal 7 is initially located in a service area 1b, and has a radio base station (CS) 2b, P
It is assumed that communication is being performed with the telephone terminal 6 via the HS connection device 3a, the relay station (ZC) 15, and the local exchange (LS) 5. Here, as described with reference to FIG. 1, when the PHS terminal 7 moves from the service area 1b to the adjacent service area 1c different from the PHS connection device, the PHS terminal 7 becomes a radio base station (CS) of the service area 1c. A call setup message (SETUP) including a handover request is transmitted to 2c. Upon receiving the call setup message (SETUP) including the handover request, the radio base station (CS) 2c returns a call setup acceptance message (CALLPROC) to the PHS terminal 7 in response to the call setup message (SETUP), and The setup message (SETUP) is transferred to the PHS connection device 3b. In the following description, the PHS connection device 3b is referred to as a “handover request source PHS connection device 3b” or a “switchover destination PHS connection device 3b” as necessary.
The service area 1 is set before the HS terminal 7 starts the handover.
The PHS connection device 3a connected first in b will be referred to as the "first PHS connection device 3a" or the "switching source PHS connection device 3a" as necessary.

The PHS connection device 3b which is the handover request source
When receiving the call setup message (SETUP) of the handover request, the call setup response message (CALLPROC) is returned to the radio base station (CS) 2c, and the call setup message is received.
Connected to the PHS terminal included in the
Address signal (IAM) for generating the
(IAM) to the service access point (SAP) 11. The service access point (SAP) 11
Upon receiving the address signal (IAM), the PHS service control station (NSP) 13 makes an inquiry (PRIS) to the effect that "how has the address signal (IAM) been received but how should it be processed". PHS Service Control Station (NSP) 13
Responds to this inquiry (PRIS),
G) and a connection instruction (CNET) of "Connect" are returned to the service access point (SAP) 11 and, at the same time, the location information of the PHS terminal 7 at the beginning is also notified.
You.

Service Access Point (SAP) 11
Receives the charging instruction (QCHG) and the connection instruction (CNET), sends a charging information signal (CHG) to the PHS connection device 3b.
Charging information acknowledgment signal in response to the charging information signal (CHG).
Signal (CHGACK) from the PHS connection device 3b
The address signal (IAM) to the relay station (ZC) 15
I believe. Upon receiving the address signal (IAM), the relay station (ZC) 15 transfers the address signal (IAM) to the first PHS connection device 3a. Upon receiving the address signal (IAM), the PHS connection device 3a returns an address completion signal (ACM) to the relay station (ZC) 15 in response to the address signal (IAM), and the relay station (ZC) 15 The address completion signal (AC
M) to the service access point (SAP) 11, and the service access point (SAP) 11 further transfers an address completion signal (ACM) to the PHS connection device 3b that has requested the handover.

The PHS connection device 3a, as described above,
Upon receipt of the address signal (IAM) from the relay station (ZC) 15, authentication is performed, and if it is confirmed that the handover request is from a proper PHS terminal , the response signal (ANM) is relayed.
To the station (ZC) 15, which causes the first PHS connection
From the device 3a to the relay station (ZC) 15, ie, the network in FIG.
The path to the network (NW) 4 is connected. The relay station (ZC) 15 transmits the response signal (ANM) from the first PHS connection device 3a to the service access point (SAP) 11
The service access point (SAP) 11 further transfers the response signal (ANM) to the PHS connection device 3b,
The PHS connection device 3b transmits a connection message (CONN) to the radio base station (CS) 2c, and the radio base station (CS) 2c further transfers the connection message (CONN) to the PHS terminal 7,
This connects the paths from the relay station (ZC) 15 to the service access point (SAP) 11, the PHS connection device 3b, the radio base station (CS) 2c, and the PHS terminal 7.
Further, the radio base station (CS) 2c and the PHS terminal 7 return a connection acknowledgment signal (CONNACK) to the connection message (CONN), respectively.

By the above-described processing, the PHS terminal 7 which has moved to the service area 1c and has issued a handover request includes the radio base station (CS) 2c, the PHS connection device 3b, the service access point (SAP) 11, and the relay station (ZC) 15. , P
The connection is made to the telephone terminal 6 via the route of the HS connection device 3a, the relay station (ZC) 15, and the local exchange (LS) 5, and both can continue communication.

When the communication between the PHS terminal 7 and the telephone terminal 6 is secured in this way, the PHS connecting device 3a transmits a disconnection message (DISC) to the radio base station (CS) 2b,
As a result, the PHS connection device 3a transmits the radio base station (CS)
The path to PHS terminal 7 via 2b is released.

Next, referring to FIGS. 3 (a), 3 (b) and 3 (c), after the PHS terminal 7 performs handover across different service areas of the PHS connection device as shown in FIG. The operation when handover is performed across different service areas of the PHS connection device and the PHS connection device will be described.

FIG. 3 (a) is a diagram showing the same state as FIG. 1, in which the PHS terminal 7 is different from the service area of the radio base station (CS) 2 connected to the PHS connection device 3a.
Radio base station (CS) connected to HS connection device 3b
2 shows a state in which the PHS terminal 7 is connected to the telephone terminal 6 through the path indicated by the bold lines 103a and 103 by moving to the service area 2 and performing handover.

FIG. 3B shows that the PHS terminal 7 is further different from the PHS connection device 3 in the state of FIG.
c, the PHS terminal 7 moves to the service area of the radio base station (CS) 2 connected to the radio base station (CS) 2.
2 shows a case where a handover request is made. As described above, the PHS connection device further differs in the radio base station (CS) 2
When the handover is performed to the service area of the PHS terminal 7, the PHS terminal 7 performs
S) 2 to PHS connection device 3c, network (NW)
The PHS terminal 7 is connected to the first PHS connection device 3a via the new path, and the new path is connected to the first PHS connection device 3a via this new path. And the first PHS connection device 3
a, thereby connecting the PHS terminal 7 to the thick line 1
Communication with the telephone terminal 6 can be continued via the new path 03b and the first path indicated by the thick line 103. Then, after this communication is secured, the old path indicated by the thick dotted line 103a is disconnected and released.

FIG. 3 (c) shows that in the state of FIG. 3 (b), the PHS terminal 7 moves to the service area of the radio base station (CS) 2 which is further connected to a different PHS connecting device 3d. , The PHS terminal 7 is connected to its radio base station (C
S) 2 shows a case where a handover request is made. In this case, similarly to the case described above, between the PHS terminal 7 and the telephone terminal 6, the newly formed path 103c and the first path 103 are connected in the first PHS connection device 3a, and via both paths The communication is continued, and the old path 103b indicated by the dotted line is disconnected and released.

Next, with reference to FIGS. 4 to 12, the handover process over the PHS connection device will be described in more detail.

In FIGS. 4 to 12, the components shown in FIGS. 1 and 2 are denoted by the same reference numerals. That is, the radio base stations (CS) 2b and 2c, the subscriber line switch (LS) 5,
Telephone terminal 6, PHS terminal 7, service access point (SAP) 11, PHS service control station (NSP) 1
3. The relay station (ZC) 15 is the same as that shown in FIGS.

Of the other components in FIGS. 4 to 12, 21 (although alphabets are added as shown in FIGS. 21a and 21b, in the case of a representative example, the alphabet is omitted and only numerals are shown). Should be represented by
Is an I-interface subscriber module adapter (I-inte
rface Subscriber Module Adapter (hereinafter abbreviated as ISMA), and 23 is an I-interface Subscriber Module (hereinafter referred to as ISMA).
M is abbreviated as M), and 25 is a group unit center (GC) in which a subscriber line exchange for directly accommodating users is installed and an exchange having a trunk line between the subscriber and the relay station is configured.
It is. In addition, ISM23 is ISDN (Integrated Serv
ices Digital Network: a module having circuit switching and additional service functions for providing a connection in an integrated service digital network. ISMA 21 is an adapter for connecting the radio base station (CS) 2 and the ISM 23 in the PHS service. .

In FIGS. 4 to 12, ISMA2
1 and the ISM 23 constitute the PHS connection device 3 shown in FIGS. 4 to 12, the radio base station (CS) 2 between the PHS terminal 7 and the ISMA 21 is omitted.

First, the first handover of a non-roaming terminal in the system configuration shown in FIG.
This will be described with reference to sequence diagrams shown in FIGS.

The handover processing over the PHS connecting apparatus shown in FIGS. 4 to 7 is the first handover processing of the terminal during non-roaming, and is almost the same as the processing shown in FIGS. That is, when the PHS terminal 7 is in the service area 1b, the radio base station (CS) 2b, the ISMA2
1a, ISM 23a, group station (GC) 25, relay station (Z
C) 15, moving from the service area 1b to the service area 1c different from the PHS connection device while communicating with the telephone terminal 6 via the local exchange (LS) 5, and from the service area 1c to the radio base station (CS). 2c, a handover request is made, and the radio base station (CS) 2c
21b, ISM23b, service access point (S
A new path to the ISM 23a and the ISMA 21a is formed via the AP) 11, the relay station (ZC) 15, and the group station (GC) 25.
To relay station (ZC) 15, group station (GC) 25, ISM2
3a, the first path to the ISMA 21a and the new path are connected, thereby forming a path as shown by a thick line in FIG. 4, and connecting the telephone terminal 6 and the PHS terminal 7 with this path, Is to achieve.

In this handover process, first, as shown in the sequence diagram of FIG. 5, the mobile station first resides in the service area 1b, and the radio base station (CS) 2b, ISMA 21a, ISM
The PHS terminal 7 which was communicating with the telephone terminal 6 via the group station (GC) 25, the relay station (ZC) 15, and the local exchange (LS) 5 is moved from the service area 1b to the PH.
When the PHS terminal 7 moves to a different service area 1c adjacent to the S connection apparatus, the PHS terminal 7 calls the radio base station (CS) 2c of the service area 1c and sends a call setup message (SETUP) including a handover request to the radio base station. (CS) 2c. Upon receiving the call setup message (SETUP) for the handover request, the radio base station (CS) 2c transfers the call setup message (SETUP) to the switching destination ISMA 21b, which is the PHS connection device that issued the handover request.

Upon receiving the call setup message (SETUP) of the handover request, the switching destination ISMA 21b returns a call setup acceptance message (CALLPROC) to the PHS terminal 7 / radio base station (CS) 2c, and furthermore, the call setup message
(SETUP) is forwarded to the ISM 23b, a call setup acceptance message (CALLPROC) is returned to the ISMA 21b, and the P setting included in the call setup message (SETUP) is returned.
An address signal (IAM) for connecting to the HS terminal is generated, and the address signal (IAM) is transmitted to the service access point (SAP) 11. When the service access point (SAP) 11 receives the address signal (IAM),
An inquiry (PRIS) to the PHS service control station (NSP) 13 stating "How to process the address signal (IAM) received but how to receive it" is made. In response to the inquiry (PRIS), the PHS service control station (NSP) 13 issues a charging instruction (QCHG) and a connection instruction "CNET" (CNET) to the service access point (SAP) 1.
Return to 1.

Service access point (SAP) 11
Receives the charging instruction (QCHG) and the connection instruction (CNET), sends a charging information signal (CHG) to the ISM 23b, and responds to the charging information signal (CHG) by a charging information acknowledgment signal (CHGA).
CK) from the ISM 23b, and transmits the address signal (IAM) to the relay station (ZC) 15.

When the relay station (ZC) 15 receives the address signal (IAM) from the service access point (SAP) 11, the relay station (ZC) 15 transfers the address signal (IAM) to the ISM 23a via the group station (GC) 25, and the ISM 23a Sends a call setup message (SETUP) to the ISMA 21a. ISMA
21a, upon receiving the call setup message (SETUP), returns a call setup acceptance message (CALLPROC) to the ISM 23a, and the ISM 23a sends an address completion signal (ACM) to the group station (G).
C) and returns it to the relay station (ZC) 15 via the relay station (ZC) 15. The relay station (ZC) 15 transfers the address completion signal (ACM) to the service access point (SAP) 11, and the service access point (SAP) 11 Further, an address completion signal (A
CM) to the ISM 23b.

Next, proceeding to the sequence diagram shown in FIG.
The ISMA 21a transmits the call setup message (SET
UP), a connection message (CONN) is sent to ISM2.
3a, and the ISM 23a sends the connection message (CON
N), a connection confirmation response signal (CONNACK) is returned, and an response signal (ANM) is transmitted to the relay station (ZC) 15 via the group station (GC) 25. Upon receiving the response signal (ANM), the relay station (ZC) 15 transfers the response signal (ANM) to the ISM 23b via the group station (GC) 25. ISM
23b transmits a connection message (CONN) to the ISMA 21b, and the ISMA 21b further transfers the connection message (CONN) to the PHS terminal 7. PHS terminal 7 and ISMA
21b sends the connection acknowledgment signal (CONNACK) to the ISM
Return to A21b and ISM23b. Through the above processing, the PHS terminal 7 sends the ISMA 21b, ISM 23b, service access point (SAP) 11, and relay station (ZC)
15, Group station (GC) 25, ISM via ISM23a
A new path up to A21a is formed.
The first path of the SMA 21a, that is, from ISMA 21a to ISM 23a, group station (GC) 25, relay station (ZC) 1
5. The PHS terminal 7 is connected to the first path to the telephone terminal 6 via the local exchange (LS) 5 and thereby the PHS terminal 7 is connected to the telephone terminal 6 via the new path and the first path. Are secured, and both are communicating on the route indicated by the double line in FIG.

When the PHS terminal 7 and the telephone terminal 6 are connected as described above, a disconnection message (DISC) is transmitted from the ISMA 21a to the radio base station (CS) to which the PHS terminal 7 is wirelessly connected. The station (CS) returns a release message (REL) to the ISMA 21a, whereas the ISMA 21a returns a release completion message (RELCOMP) to the radio base station (CS), so that the ISMA 21a transmits the release message (RELCOMP) to the radio base station (CS). The path to the completed PHS terminal 7 is released.

Next, with reference to FIG. 7, a description will be given of a recovery process at the end of communication. In FIG. 7, the PHS terminal 7 ends the communication with the telephone terminal 6, and the disconnection message (DIS
C) to the ISMA 21b, the ISMA 21b sends a disconnect message (DISC) to the ISM 23b,
The MA 21b further sends a release message (REL) to the PHS terminal 7.
Will be returned. The ISM 23b returns a release message (REL) to the ISMA 21b. As a result, the PHS terminal 7 and the ISMA 21b respectively release the release message (RE
L) in response to the release completion message (RELCOMP)
A21b and ISM23b, which
The path from the S terminal 7 to the ISMA 21b and ISM 23b is released.

Also, as described above, the ISM 23b
Upon receiving the disconnect message (DISC) from the MA 21b,
Release message (REL) is sent to the service access point (S
AP) 11. Service access point (S
The AP 11 returns a recovery completion message (RLC) to the ISM 23b in response to the release message (REL), and further transmits a release message (REL) to the relay station (ZC) 15. The relay station (ZC) 15 releases the message (REL)
Is received, a recovery completion message (RLC) is returned to the service access point (SAP) 11, thereby
Service access point (SAP) 1 from SM23b
1, the path to the relay station (ZC) 15 is released. Further, the relay station (ZC) 15 sends a release message (REL).
Is transmitted to the group station (GC) 25. The group station (GC) 25 responds to the release message (REL) and issues a recovery completion message (R
LC) to the relay station (ZC) 15 and a release message (REL) to the ISM 23a. ISM23
Upon receiving the release message (REL), a returns a recovery completion message (RLC) to the group station (GC) 25,
A disconnect message (DISC) is transmitted to the ISMA 21a, and the ISMA 21a sends a release message (REL) to the ISMA 21a.
Then, the ISM 23a sends a release completion message (RELCOMP) to the ISMA 21a, whereby the relay station (ZC) 15 transfers the group station (GC) 25 to the ISM 2a.
The path to ISMA 21a via 3a is released.

Next, the ISMA 21a transmits a disconnect message (DISC) to the ISM 23a. ISM23a
When the disconnection message (DISC) is received, the release message (REL) is returned to the ISMA 21a, and the release message (REL) is transmitted to the group station (GC) 25. ISM
Upon receiving the release message (REL) from the ISM 23a, the A 21a transmits a release complete message (RELCOMP) to the ISM 23.
Return to a. Upon receiving the release message (REL) from the ISM 23a, the group station (GC) 25 returns a restoration completion message (RLC) to the ISM 23a and transmits the release message (REL) to the relay station (ZC) 15. When the relay station (ZC) 15 receives the release message (REL), it returns a recovery completion message (RLC) to the group station (GC) 25 and sends the release message (REL) to the local exchange (L).
S) Transmit to 5. Upon receiving the release message (REL), the local exchange (LS) 5 receives a recovery completion message (R
LC) is returned to the relay station (ZC) 15 and the telephone terminal 6 is disconnected. As a result, ISMA21
a to ISM 23a, group station (GC) 25, relay station (Z
C) 15, the first path to the telephone terminal 6 via the local exchange (LS) 5 is also disconnected.

Next, the second handover of the terminal not roaming in the system configuration shown in FIG.
This will be described with reference to sequence diagrams shown in FIGS.

The handover process over the PHS connecting apparatus shown in FIGS. 8 to 12 is the second handover process of the terminal not roaming, and is the first handover process of the terminal not roaming shown in FIGS. As a result of the handover process, the PHS terminal 7 is indicated by the bold solid line in FIG. 4 and from the radio base station (CS) 2c in the service area 1c to the ISMA 21b, the ISM 23b, and the service access point (SAP) 11a as indicated by the bold dotted line 81 in FIG. To the switching source ISMA 21a, which is the first PHS connection device, and further returns from the ISMA 21a to
In a state where the PHS terminal 7 is connected to the telephone terminal 6 through the M23a, the group station (GC) 25, the relay station (ZC) 15, and the local exchange (LS) 5, the service area 1
c, moves to a different adjacent service area 1e of the PHS connection device as indicated by an arrow 82, makes a handover request from the service area 1e to the radio base station (CS) 2e, and sends a handover request from the radio base station (CS) 2e to the ISMA 21c.
ISM23c, Service Access Point (SAP) 1
1b, a new path to the ISM 23a and the ISMA 21a is formed via the relay station (ZC) 15 and the group station (GC) 25, whereby the relay terminal (ZC) 15, the group station (GC) 25 from the telephone terminal 6 in the ISMA 21a. , ISM23a
The first path to the ISMA 21a is connected to the new path via the network, a path shown by a bold line in FIG. 8 is formed, and the telephone terminal 6 and the PHS terminal 7 are connected by this path to achieve handover. It is.

9 to 12 showing the operation of the second handover process of the terminal during non-roaming shown in FIG. 8, the processes shown in the sequence diagrams of FIGS. The PHS terminal 7, which corresponds to the processing of FIG. 6 and has made a handover request in the same manner as the processing corresponding to the first handover shown in FIGS. Station (CS) 2e / ISMA 21c to ISM 23c, service access point (SAP) 11b, relay station (Z
C) 15, the group station (GC) 25, the switching source ISMA 21a which is the first PHS connection device via the ISM 23a.
This is a process for forming a path that connects to

The sequence diagram shown in FIG. 11 shows the paths remaining in the second handover, that is, P before the handover.
From the HS terminal 7 to the radio base station (CS) 2c / ISMA21
b, ISM23b, service access point (SA
P) 11a, relay station (ZC) 15, group station (GC) 25,
This is a process of disconnecting and releasing the path to the switching source ISMA 21a, which is the first PHS connection device, via the ISM 23a.

Specifically, the PHS terminal 7 moved by the handover in the processing of FIGS.
S) 2e to ISMA 21c, ISM 23c, service access point (SAP) 11b, relay station (ZC) 1
5. ISMA via group station (GC) 25, ISM23a
21a, where it is turned back to ISMA2
1a to ISM 23a, group station (GC) 25, relay station (Z
C) 15, after being connected to the telephone terminal 6 through the local exchange (LS) 5 to be in a communication state, the ISMA 21a
Transmits a disconnection message (DISC) to the ISM 23a, the ISM 23a receiving the disconnection message (DISC) transfers the release message (REL) to the group station (GC) 25, and further transmits the release message (REL) to the group station (GC). ) 25 to the service access point (SAP) 11a and the ISM 23b. In response, the ISM 23a returns a release message (REL) to the ISMA 21a,
a sends a release completion message (RELCOMP) to the ISM 23a. The group station (GC) 25 and the relay station (ZC) 1
5. The service access point (SAP) 11a and the ISM 23b send a recovery completion message (RLC)
It returns to the SM 23a, the group station (GC) 25, the relay station (ZC) 15, and the service access point (SAP) 11a. Further, upon receiving the release message (REL) from the service access point (SAP) 11a, the ISM 23b returns a recovery completion message (RLC) to the service access point (SAP) 11a and transmits a disconnection message (DISC) to the ISAM 21b. I do. ISMA
When receiving the disconnect message (DISC), the return message (REL) is returned to the ISM 23b, and the disconnect message (DISC) is transferred to the wireless base station (CS) to which the PHS terminal 7 is wirelessly connected. In addition, ISM23
b receives the release message (REL) from the ISAMA 21b and returns a release completion message (RELCOMP). Upon receiving the disconnection message (DISC) from the ISMA 21b, the radio base station (CS) sends a release message (REL) to the IS
Return to MA 21b. Upon receiving the release message (REL) from the radio base station (CS), the ISMA 21b returns a release completion message (RELCOMP) to the radio base station (CS). As a result, the radio base station (CS) 2c / ISMA 21b, ISM 23
b, the switching source ISMA which is the first PHS connection device via the service access point (SAP) 11a, the relay station (ZC) 15, the group station (GC) 25, and the ISM 23a
The path up to 21a is disconnected and released.

The processing shown in the sequence diagram of FIG. 12 is the same recovery processing as the processing shown in FIG. 7 described above.
The process of disconnecting and releasing all connections between the PHS terminal 7 and the telephone terminal 6 by a disconnection message (DISC) from the PHS terminal 7 is shown.

Note that the processing described with reference to FIGS. 4 to 12 above is a processing relating to a handover over a PHS connecting device performed from a terminal not roaming, but this processing is also applied to a terminal roaming. It can be applied to

[0048]

As described above, according to the present invention,
When the PHS terminal moves to another service area of a different PHS connection device and makes a handover request,
The HS connection device causes a new path to be formed through the network to the first PHS connection device.
The first path to the HS connection device and the new path are connected at the first PHS connection device, so that the PHS terminal can connect to another PHS connection device via the different PHS connection device, the new path, the first PHS connection device, and the other via the first path. Since communication with the terminal is continued, even if the terminal moves to the service area of a wireless base station connected to a different PHS connection device, communication can be continued without being disconnected as in the related art.

Also, according to the present invention, a PHS terminal located in another service area different from the PHS connection device is provided with a PHS terminal.
When moving to a different service area of the S connection device and making a handover request, the further PHS connection device causes a new path to be formed to the first PHS connection device,
The first path from the other terminal to the first PHS connection device and the new path are connected in the first PHS connection device, and the PHS terminal further differs in PHS connection device, new path, first PHS connection device, The PHS terminal continues the connection with another terminal through the path of the first PHS connection device through the network and releases the new path from the different PHS connection device to the first PHS connection device through the network.
The communication can be continued even when moving between service areas of the HS connection device.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram for implementing a handover method across a PHS connection device according to an embodiment of the present invention.

FIG. 2 is a sequence diagram showing the operation of the embodiment shown in FIG.

FIG. 3 shows a PHS terminal in the embodiment shown in FIG.
FIG. 9 is a diagram for explaining an operation in a case where handover is performed one after another across different service areas of the PHS connection device after performing a handover across different service areas of the S connection device.

FIG. 4 is a diagram showing a system configuration for performing a first handover over a PHS connection device of a non-roaming terminal in the embodiment shown in FIG. 1;

FIG. 5 is a sequence diagram showing a part of processing of a first handover of a non-roaming terminal implemented in the system configuration shown in FIG. 4;

6 is a sequence diagram showing a part of the first handover of the non-roaming terminal, which is performed in the system configuration shown in FIG. 4 and subsequent to FIG. 5;

FIG. 7 is a sequence diagram showing a remaining process subsequent to FIG. 6 of the first handover of the terminal during non-roaming performed in the system configuration shown in FIG. 4;

8 is a diagram illustrating a system configuration for performing a second handover over a PHS connection device of a terminal that is not roaming in the embodiment illustrated in FIG. 1;

9 is a sequence diagram showing a part of a process of a second handover of a non-roaming terminal implemented in the system configuration shown in FIG. 8;

FIG. 10 is a sequence diagram showing a part of the second handover of the non-roaming terminal performed in the system configuration shown in FIG. 8, following the process shown in FIG. 9;

11 is a sequence diagram illustrating a part of the second handover of the terminal during non-roaming, which is performed in the system configuration illustrated in FIG. 8 and is subsequent to FIG. 10;

12 is a sequence diagram showing a part of the second handover of the terminal during non-roaming, which is performed in the system configuration shown in FIG. 8 and subsequent to FIG. 11;

FIG. 13 is a diagram illustrating a handover in a conventional PHS service.

[Explanation of symbols]

 1 Service Area 2 Radio Base Station (CS) 3 PHS Connection Device 4 Network (NW) 5 Subscriber Line Switch (LS) 6 Telephone Terminal 11 Service Access Point (SAP) 13 PHS Service Control Station (NSP) 15 Relay Station (ZC) ) 21 ISMA 23 ISM

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazuo Sato 1-9-1-1 Konan, Minato-ku, Tokyo Inside NTT Communicationware Co., Ltd. (72) Inventor Fumio Mutoh Konan-ichi, Minato-ku, Tokyo No. 9-1, NTT Communicationware Co., Ltd. (72) Inventor Nobuyuki Uta, No. 9-1, Konan, Minato-ku, Tokyo 1-9-1, NTT Communicationware Co., Ltd. (72) Inventor: Manabu Katagiri, Nippon Telegraph and Telephone Corporation, 3-19-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo (72) Inventor: Shosen Yoshimura Nippon Telegraph and Telephone Corporation, 3-2-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inventor Minoru Tanaka 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Okada Next Tokyo Nishi-Shinjuku, Shinjuku-ku, Third Street No. 19 No. 2, Nippon Telegraph and Telephone Corporation in the F-term (reference) 5K067 AA22 BB04 DD57 EE02 EE10 EE16 EE24 JJ35 JJ39 JJ52 JJ70

Claims (2)

[Claims] 1. A handover method over a PHS connection device for performing a handover between different service areas of the PHS connection device, wherein a PHS terminal located in a certain service area is connected via a radio base station, a PHS connection device, and a network. Other PHS
In a state where the terminal is connected to another terminal including a fixed telephone terminal, the PHS terminal moves from the certain service area to another different service area of the PHS connection device, and from the PHS terminal via the radio base station. The different P
When a handover request is made to the HS connection device, the different PHS connection device responds to the handover request to form a new path to the first PHS connection device via a network, and The first PH
The first path connected to the S connection device and the new path are connected at the first PHS connection device, whereby the PHS terminal can connect the different PHS connection device, the new path, the first PHS connection device, and the first PHS connection device. A handover method over a PHS connection device, characterized by continuing connection with the another terminal via a path. 2. The PHS terminal, which is located in the different service area of the PHS connection device, moves to a different service area of the PHS connection device, and the PHS terminal transmits the different PHS from the PHS terminal via a radio base station. When a handover request is made to the connection device, this further different P
The HS connection device responds to the handover request to form a new path to the first PHS connection device via a network, and the first terminal connects to the first PHS via the network from the other terminal.
Connecting the first path connected to the S connection device and the new path at the first PHS connection device, wherein the PHS terminal sets the further different PHS connection device, the new path, the first PHS connection device, The method according to claim 1, wherein the connection with the other terminal is continued via a first path, and a new path from the different PHS connection apparatus to the first PHS connection apparatus via a network is released. A handover method over a PHS connection device.