JP2002209241A - Hand-over processing method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology where an MSC(Mobile Switching Controller) transmits a frame including a pass setup request to an RNC(Radio Network Controller) corresponding to values of a VPI(virtual path connection identifier), VCI(virtual channel identifier) and CID(channel identifier) included in a frame from a request source RNC when the request source RNC makes a pass setup request and the RNC receiving the request of pass setup transmits a frame including a pass setup acknowledgement to the request source RNC for the pass setup so as to directly set up the path between the RNCs. SOLUTION: When a mobile terminal 6 moves from a service area of a Node 12 to a service area of a Node 31 and requires hand-over, an RNC 1 transmits a frame including a pass setup request to an RNC 3 via an MSC 2 and the RNC 3 receiving the pass setup request transmits a frame including a pass setup acknowledgement to the RNC 1 via the MNC 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handover method and a system for mobile communication, and more particularly to a handover method for establishing a path connection between mobile base station controllers directly via a mobile exchange, and a method thereof. About the system.

[0002]

2. Description of the Related Art FIGS.
This will be described with reference to FIG.

FIG. 7 is a block diagram of a first mobile system. FIG. 8 is a diagram for explaining the operation of the first mobile unit system. FIG. 9 is a block diagram of the second mobile system.

[0004] First, a first mobile system will be described.

[0005] As shown in FIG.
Mobile switching system (MSC: Mobile Switchi)
ng Control (602) to a mobile base station controller (RNC: Radio Network Control)
controller) 601, 602 are connected, and the RNC 601 is connected.
Are connected to mobile base stations (Nodes) 604 and 605, and the RNC 603 is connected to Nodes 606 and 607. During the call, the mobile unit terminal (UE: Us)
er Equipment) moves from the service area of the Node 605 to the service area of the Node 606, in order to perform handover processing between the RNC 601 and the RNC 603, the ITU-T Q. RNC 601 and RNC using protocol messages of H.2630.1
A path is established with the 603.

At the time of establishing this path, as shown in FIG. 8, first, the RNC 601 sets the ALCAP (Access).
Link Capabilities Applic
ation part) 2 VC (Virtual C)
AA for requesting path establishment via the
L (ATM Adaptation Layer) 2 establishment request, virtual path connection identifier (VPCI: Vi)
true PathConnection Iden
tiffer), virtual channel identifier (VCI: Vir)
Tual Channel Identifier),
And a channel identifier (Channel IDentif)
ier) is transmitted to the MSC 602. Then, M which has received the frame from RNC 601
The SC 602 transmits a frame including the AAL2 establishment response to the RNC 601 to establish a path between the RNC 601 and the MSC 602. Further, the MSC 602 has the RNC 601
RNC 6 to which VPCI, VCI, and CID values matching the VPCI, VCI, and CID values received from
03, AAL2 establishment request, VPCI, VCI, and C
The RNC 603 receives the frame including the ID value, and transmits the frame including the AAL2 establishment response to the MSC 602. In this way, the RNC
The path between the RNC 601 and the RNC 603 is established.

Next, a second conventional example will be described.

FIG. 9 is a block diagram of the second mobile system.

[0009] As shown in FIG. 9, the second mobile system comprises an RNC 601 and an RNC 603 without using the MSC 602.
Is directly connected to By adopting such a configuration, the RNC 601 transmits the AAL2 establishment request to the RNC 603 and the ALL through the ALCAP VC.
2 The transmission and reception of the establishment response can be directly performed.

[0010]

However, in the first mobile system, in order to establish a path between the RNC 601 and the RNC 603, first, the RNC 601 and the MSC 60
2 and a path establishment process between the MSC 602 and the RNC 603 must be performed.
In order to establish a path between the C601 and the RNC 603, two path establishment processes must be performed, and there is a disadvantage that the processing capability of the MSC 602 is reduced.

Further, in the second mobile system, every time the number of RNCs increases, it becomes necessary to prepare a physical line between all the RNCs, which causes a problem in cost.

[0012] The present invention has been made in view of the above point, and the problem to be solved by the present invention is that when an RNC requests a path establishment, the MSC uses the VPCI included in the frame from the RNC. , VCI, and CID, determine the RNC, transmit a frame to the determined RNC, and receive the path establishment request.
By transmitting a frame including a response to the path establishment to the RNC requesting the path establishment through the MSC,
An object of the present invention is to provide a technique for establishing a path between RNCs.

[0013]

An object of the present invention is to provide a hand for performing a path connection between mobile base station controllers using a system having a plurality of mobile base station controllers and a mobile switch in mobile communication. An over-processing method, wherein the mobile base station controller includes a path establishment request or a path establishment response, a virtual path connection identifier of the mobile base station controller of the path establishment request destination, a virtual channel identifier, and a frame including the channel identifier. Transmitting the frame to the mobile switch, and the mobile switch transmitting the frame based on the virtual path connection identifier, the virtual channel identifier, and the channel identifier included in the frame. And transmitting the frame to the determined mobile base station controller. It is solved by the handover processing method comprising Rukoto.

[0014] The above object is achieved by a first mobile base station controller, a second mobile base station controller in mobile communication,
A handover processing method for performing a path connection between mobile base station controllers using a system having a mobile switching center and a mobile switching center, wherein the first mobile base station controller performs a path establishment request, Transmitting a frame including the virtual path connection identifier, the virtual channel identifier, and the channel identifier of the mobile base station controller to the mobile switch, and the mobile switch includes a virtual path connection identifier included in the frame; Determining a second mobile base station controller transmitting the frame based on the virtual channel identifier and the channel identifier; and transmitting the frame to the determined second mobile base station controller. Step, the second mobile base station controller responds to the request for path establishment, the virtual path of the first mobile base station controller, Transmitting a frame including a connection identifier, a virtual channel identifier, and a channel identifier; and the mobile switch, based on the virtual path connection identifier, the virtual channel identifier, and the channel identifier included in the frame, Determining a first mobile base station controller that transmits
Transmitting a frame including a response to the request for path establishment, a virtual path connection identifier, a virtual channel identifier, and a channel identifier of the first mobile base station controller. Will be resolved.

In particular, in the handover processing method, the mobile switching center requests the mobile base station controller to transmit information on a virtual path connection identifier, a virtual channel identifier, and a channel identifier. The mobile base station controller, a virtual path connection identifier,
Transmitting a virtual channel identifier and channel identifier information to the mobile switching center; the mobile base station controller; a virtual path connection identifier from the mobile base station controller; and the mobile base station controller. And storing the virtual channel identifier from the device and the channel identifier from the mobile base station controller in the mobile switching center in association with each other.

An object of the present invention is to provide a handover system having a mobile base station controller and a mobile switch in mobile communication, wherein the mobile base station controller has a path establishment request or a path establishment response, a virtual path Means for generating a frame including a connection identifier, a virtual channel identifier, and a channel identifier;
Or a transmission / reception means for performing reception, wherein the mobile exchange comprises: transmission / reception means for transmitting and / or receiving a frame from the mobile base station control device; and A device, the virtual path connection identifier,
A storage unit in which a virtual channel identifier and a channel identifier are stored in association with each other; a virtual path connection identifier, a virtual channel identifier, and a virtual path identical to the channel identifier included in the frame received by the transmission / reception unit A connection identifier, a virtual channel identifier, and a mobile base station controller assigned with a channel identifier are searched from the storage unit, and the frame is transmitted to the searched mobile base station controller to the transmission / reception unit. And a control unit for causing the handover system to perform the control.

An object of the present invention is to provide a handover system having a mobile local control device and a mobile exchange in mobile communication, wherein the mobile exchange transmits and receives frames from the mobile base station control device. Transmission / reception means for performing reception, the mobile base station controller, the virtual path connection identifier, a virtual channel identifier, and a channel identifier which are stored in association with each other; The virtual path connection identifier, the virtual channel identifier, and the virtual path connection identifier, the virtual channel identifier, and the mobile base station controller to which the channel identifier is the same as the channel identifier included in the frame received by the means. A search is made from storage means, and the frame is transmitted to the searched mobile base station controller. It is solved by a hand-over system characterized by a control means for transmitting to the receiving means.

In particular, the control means is configured to request the information of the virtual path connection identifier, the virtual channel identifier, and the channel identifier of the mobile base station controller from all the mobile base station controllers. Features.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram of a mobile system. As shown in FIG. 1, during a call, the mobile terminal 6
When moving from the service area of de12 to the service area of Node31, the mobile base station controller 1 (RNC: Radio N
It is necessary to perform a handover process between the network controller (network controller) and the RNC 3, and as a pre-process, a path needs to be established between the RNC 1 and the RNC 3.

Hereinafter, a method for realizing the present invention will be described.

First, a method of initializing the mobile system will be described.

When a path establishment request is generated between RNCs, a VP (virtual) for establishing a path between the RNCs is processed so that path establishment processing can be performed directly between the RNCs.
1Path), and in order to know how the prepared VPs are assigned to each RNC, a mobile switching center (MSC: Mobile SwitchingCo) is used.
control) and a fixed path (PVP: P) between the RNC.
(Emergency Virtual Path) connection. Then, the MSC acquires the values of VPCI, VCI, and CID allocated to all the RNCs by the PVP connection, and creates a path correspondence database that stores the acquired VPCI, VCI, and CID values in association with the RNC. I do.

Next, a method of establishing a path between RNCs will be described.

FIG. 2 is a diagram for explaining the present embodiment. FIG. 3 is a diagram for explaining an operation of establishing a path between RNC1 and RNC3.

When the mobile terminal device 6 moves from the service area of the node 12 to the service area of the node 31 during a call, a handover process is performed between the RNC 1 and the RNC 3 so that a semi-fixed path (PVC: Pe) is used between the RNCs.
(virtual virtual channel) connection. This will be specifically described below.

The RNC 1 is, as shown in FIGS. 2 and 3,
ALCAP (Access Link Capabil)
AAL (ATM Adaptat) for requesting path establishment via VCs (Virtual Channel) for items Applications Part 2
and transmits a frame including the values of the VCI, VCI, and CID assigned to the RNC 3 to the MSC 2. MSC2 is RNC1
, VC included in the frame transmitted from
VPCI, VCI, and C identical to the values of I and CID
An RNC to which an ID value is assigned is searched from the path corresponding database of the own device, and a frame is transmitted to the searched RNC. Then, the RNC that has received the frame, A
AAL2 establishment response, VPCI, VCI of RNC of AAL2 establishment request, to RNC of AL2 establishment request
And a frame including the CID, and establish a path between the RNCs.

An apparatus for implementing the above method will be described.

FIG. 4 is a block diagram of the present invention. FIG. 5 is a diagram for explaining the path correspondence database.

In FIG. 4, reference numerals 101 and 301 denote transmission / reception units of the RNCs 1 and 3. The transmission / reception units 101 and 301 transmit / receive a frame including the AAL2 establishment request for establishing a path between RNCs, the VPCI, VCI, and CID values of the RNC of the path establishment request destination, or respond to the AAL2 establishment request. AAL2 establishment response, VP of RNC of path establishment request source
It transmits and receives frames including the values of CI, VCI, and CID.

Reference numerals 102 and 302 denote control units of the RNCs 1 and 3. The control units 102 and 302 control a path establishment process between RNCs in order to perform a handover process that enables a continuous call. For example, as shown in FIG. 1, when the mobile terminal device 6 moves from the service area of the Node 12 to the service area of the Node 31 during a call, the control unit 102 of the RNC 1 issues an AAL2 establishment request for establishing a path between the RNCs. , RNC3, the transmitting / receiving unit 101 transmits a frame including “VPCI = 1, VCI = 4, CID = 5”. On the other hand, R
The control unit 302 of the NC 3 causes the transmission / reception unit 302 to receive the frame transmitted via the MSC 2, responds to the AAL 2 establishment request in response to the AAL 2 establishment request, and “VPCI = 1, VCI = 2, CID = 3” assigned to the RNC 1. Is transmitted to the transmission / reception unit 301. And
The control unit 102 of the RNC 1 transmits the RNC via the RNC 2
When receiving the frame from RNC3, it is determined that a path has been established between RNC1 and RNC2.

Reference numerals 201 and 202 denote transmission / reception units of the MSC2. The transmission / reception units 201 and 202 transmit and receive frames from the RNCs 1 and 3 according to instructions from the control unit 204.

Reference numeral 203 denotes a MEM (storage device). ME
M203 stores a path correspondence database. The path correspondence database is as shown in FIG.
One record is RNC, this RNC and own device (MSC)
Is a VPC indicating which physical line is connected to
It consists of I, VCI, and CID fields. For example,
In FIG. 4, RNC1 is "VPCI = 1, VCI = 2, C
ID = 3 ", and RNC3 is connected to" VPCI
= 1, VCI = 4, CID = 5 ″.

Reference numeral 204 denotes a control unit of the MSC 2. The control unit 204 determines the VPCI, VCI, and CID values of all the RNCs connected to the mobile device at the time of initial setting of the mobile system.
The P connection is performed to obtain the values of VPCI, VCI, and CID. Then, the control unit 204 controls the VP from each RNC.
The values of the CI, VCI, and CID are stored in the path correspondence database of the MEM 203. For example, the control unit 203
However, when a PVP connection is made to the RNC1 via the transmission / reception unit 201, the RNC1 receives "VPCI = 1, VCI =
2, CID = 3 ″ is returned.
4 is an RNC in the path correspondence database of the MEM 201.
1 and “VPCI = 1, VCI = 2, CID = 3” are stored in association with each other. Further, the control unit 204 extracts VPCI, VCI, and CID values from the transmitted frame, and searches the path correspondence database of the MEM 203 for an RNC that matches the extracted VPCI, VCI, and CID values. Then, the frame is transmitted to the RNC. For example, when there is an AAL2 establishment request from RNC1 to RNC3, RNC1 sends an AAL2 establishment request, RN
“VPCI = 1, VCI =
4, the frame including "4, CID = 5" is transmitted to the MSC2. As shown in FIG. 5, the MSC2 extracts "VPCI = 1, VCI = 4, CID = 5" from the received frame, and extracts "". VPCI = 1, VCI = 4, CID =
The RNC 3 matching 5 ”is searched from the path correspondence database of the MEM 203, and the frame from the RNC 1 is transmitted to the searched RNC 3.

Next, the operation of the above configuration will be described.

First, the initial setting of the MSC will be described.

In order to know which VPCI, VCI, and CID values are set for all the RNCs connected to the own device, the control unit of the MSC sends all the RNCs via the transmission / reception unit. Make a PVP connection request. Then, the control units of all the RNCs that have received the PVP connection request transmit a frame including the values of the PVP connection response, VPCI, VCI, and CID to the MSC via the transmission / reception unit. For example, the control unit 204 sends the RNC
When a PVP connection request is issued to the PPV 1, the control unit 102 that has received the PVP connection request
P connection response, "VPI = 1, VCI = 2, CID = 3"
Send a frame containing. Furthermore, the control unit of the MSC converts the VPI, VCI, and CID from the received frame.
Is extracted, and the extracted VPCI, VCI, and CID are extracted.
Is stored in the path correspondence database of the MEM.

Next, the operation of path connection between RNCs will be described.

FIG. 6 is a flowchart of the operation in path connection between RNCs.

As shown in FIG. 1, when the mobile terminal device 6 moves from the service area of the Node 12 to the service area of the Node 31 during a call, the control unit 102 performs a handover process for enabling a continuous call.
Is an AALL2 establishment request, RNC3 VPCI, VC
The transmission / reception unit 101 transmits a frame including the values of I and CID.
Send to Then, the transmission / reception unit 101 transmits the frame to the MSC 2 via the VC for ALCAP (Step
p401).

The control unit 204 having received the frame from the RNC 1 transmits the VPCI, VCI,
And the value of the CID are extracted (Step 402).

The controller 204 extracts the VPCI, VCI, and C extracted from the path correspondence database of the MEM 203.
A search is made for an RNC to which VPCI, VCI, and CID values that match the ID value are assigned. For example, the values of the extracted VPCI, VCI, and CID are "VPC
When I = 1, VCI = 4, and CID = 5 ″, as shown in FIG. 4, the RNC 3 is searched from the path correspondence database of the MEM 203 (Step 403).

The control unit 204 controls the transmitting / receiving unit 202 to transmit the frame from the RNC 1 to the RNC 3, and the transmitting / receiving unit 202 transmits the frame to the RNC 3 via the VC for ALCAP (Step 404).

The control unit 302, having received the frame from the MSC2, responds to the AAL2 establishment request from the RNC1 by sending an AAL2 establishment response, a VPCI and a VC of the RNC1.
The transmission / reception unit 301 transmits a frame including the values of I and CID.
, And the transmitting / receiving section 301 transmits the frame to the MSC 2 via the VC for ALCAP (Step 40).
5).

The control unit 204 having received the frame from the RNC 3 determines whether the VPCI, VCI,
And the value of the CID are extracted (Step 406).

The controller 204 extracts the VPCI, VCI, and C from the path correspondence database of the MEM 203.
The RNC to which the VPCI, VCI, and CID values matching the ID are assigned is searched. For example, when the values of the extracted VPCI, VCI, and CID are “VPCI =
1, VCI = 2, CID = 3 ″, as shown in FIG.
C1 is searched (Step 407).

The control unit 204 of the MSC 2
1 to control the transmission of the frame from the RNC3 to the RNC1, and the transmission / reception unit 201 transmits the frame to the RNC1 via the VC for ALCAP (Step 40).
8).

In the present embodiment, the PVC connection method has been described as the path connection between the RNCs. However, the path connection between the RNCs can be performed by the PVP connection method.

[0049]

According to the present invention, a path connection can be made directly between RNCs, so that the processing capability of the MSC can be improved and the cost of the transmission line can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a mobile system.

FIG. 2 is a diagram for explaining the present embodiment.

FIG. 3 is a diagram for explaining an operation of establishing a path between RNC1 and RNC3.

FIG. 4 is a block diagram of the present invention.

FIG. 5 is a diagram for explaining a path correspondence database.

FIG. 6 is a flowchart of an operation in path connection between RNCs.

FIG. 7 is a block diagram of a first mobile system.

FIG. 8 is a diagram for explaining the operation of the first mobile system.

FIG. 9 is a block diagram of a second mobile system.

[Explanation of Signs] 1, 2, RNC 3 MSC 11, 12, 31, 32 Node 6 Mobile terminal device

Claims (6)

[Claims] 1. A mobile communication system comprising a plurality of mobile base station controllers and a mobile switching system.
What is claimed is: 1. A handover processing method for performing a path connection between mobile base station controllers, the mobile base station controller comprising: a path establishment request or a path establishment response; Transmitting a frame including a connection identifier, a virtual channel identifier, and a channel identifier to the mobile switch, wherein the mobile switch is configured to transmit the frame based on the virtual path connection identifier, the virtual channel identifier, and the channel identifier included in the frame. Determining a mobile base station controller that transmits the frame, and transmitting the frame to the determined mobile base station controller. 2. A path between mobile base station controllers using a system having a first mobile base station controller, a second mobile base station controller, and a mobile switch in mobile communication. A handover processing method for making a connection, wherein the first mobile base station controller transmits a path establishment request, a virtual path connection identifier of the second mobile base station controller,
Transmitting a frame including a virtual channel identifier and a channel identifier to the mobile switch, wherein the mobile switch determines, based on a virtual path connection identifier, a virtual channel identifier, and a channel identifier included in the frame, Second to send frame
Determining the mobile base station controller of the following; transmitting the frame to the determined second mobile base station controller; and requesting a path establishment by the second mobile base station controller. Transmitting a frame including a virtual path connection identifier, a virtual channel identifier, and a channel identifier of the first mobile base station controller, and the mobile switching center includes a virtual path connection included in the frame. An identifier, a virtual channel identifier, and a first transmitting the frame based on the channel identifier.
Determining a mobile base station controller of the following; responding to the determined first mobile base station controller to the request for path establishment; a virtual path connection identifier of the first mobile base station controller; Transmitting a frame including a virtual channel identifier and a channel identifier. 3. The handover processing method, wherein the mobile switch requests transmission of information of a virtual path connection identifier, a virtual channel identifier, and a channel identifier to all mobile base station controllers. A mobile base station controller transmitting a virtual path connection identifier, a virtual channel identifier, and information of a channel identifier to the mobile switchboard; from the mobile base station controller and the mobile base station controller, And storing the virtual path connection identifier, the virtual channel identifier from the mobile base station controller, and the channel identifier from the mobile base station controller in the mobile switching center in association with each other. The handover processing method according to claim 1 or 2, wherein 4. A handover system having a mobile base station controller and a mobile switch in mobile communication, wherein the mobile base station controller includes a path establishment request or a path establishment response, a virtual path connection identifier, Means for generating a frame including a virtual channel identifier and a channel identifier; and transmission / reception means for transmitting and / or receiving the frame, wherein the mobile switchboard comprises: Transmission of frames and / or
Or a transmission / reception unit for performing reception, the mobile base station controller, the storage unit storing the virtual path connection identifier, the virtual channel identifier, and the channel identifier in association with each other, and the transmission / reception unit. A virtual path connection identifier, a virtual channel identifier, and a virtual path connection identifier identical to the channel identifier included in the frame received at
Control means for searching the storage means for a mobile base station control device to which a virtual channel identifier and a channel identifier are assigned, and causing the searched mobile base station control device to transmit the frame to the transmission / reception means And a handover system. 5. A handover system having a mobile local controller and a mobile switch in mobile communication, wherein the mobile switch transmits and / or transmits frames from the mobile base station controller.
Or a transmission / reception unit for performing reception, the mobile base station controller, the storage unit storing the virtual path connection identifier, the virtual channel identifier, and the channel identifier in association with each other, and the transmission / reception unit. A virtual path connection identifier, a virtual channel identifier, and a virtual path connection identifier identical to the channel identifier included in the frame received at
Control means for searching the storage means for a mobile base station control device to which a virtual channel identifier and a channel identifier are assigned, and causing the searched mobile base station control device to transmit the frame to the transmission / reception means And a handover system. 6. The control means includes: a virtual path connection identifier of a mobile base station controller;
6. The handover system according to claim 4, wherein the handover system is configured to request information of the virtual channel identifier and the channel identifier from all the mobile base station controllers.