Handover method between mobile switching centers using...

Details Handover method between mobile switching centers using... Handover method between mobile switching centers using...

1999-03-25

2003-03-04

Le, Thanh Cong (Department: 2684)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S360000, C370S386000

Reexamination Certificate

active

06529490

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a handover method between mobile switching centers using an intelligent network and an IMT(International Mobile Telecommunication)-2000 network system adapting the same, and in particular, to a handover method between mobile switching centers using an intelligent network and an IMT-2000 network system adapting the same which are capable of effectively managing a link resource for a radio transfer by performing a handover between mobile switching centers for an IMT-2000 network using an intelligent network.
2. Description of the Conventional Art
FIG. 1
is a block diagram illustrating an IMT-2000 network system which is designed for providing a mobile multimedia service of a voice system and a non-voice system using a frequency band.
As shown therein, the conventional IMT-2000 network system includes a radio access network(hereinafter called “RAN”)
100
for optimizing a radio environment, a core network(CN)
200
for performing a high speed transfer function and a switching function with respect to the multimedia service, and an intelligent network(IN)
300
for providing various multimedia services. The above-described RAN
100
, the CN
200
and the IN
300
are designed to have an independent function for the network and not to affect other networks even when the function and construction of the other networks are changed.
The RAN
100
includes MT (Mobile Terminals)
110
and
111
, BTS (Base Terminal Stations)
120
and
121
connected with the MT
110
and
111
for controlling the MT
110
and
111
, and RNC(Radio Network Controllers)
130
and
131
for controlling the BTS
120
and
121
.
The RNC
130
and
131
perform RACF(Radio Access control Functions)
140
and
150
and ARF(Access Link Relay Functions)
141
and
142
. The RACF
140
and
150
perform a function for controlling a radio resource and call, and the ARF
141
and
142
perform an anchor handover between the RNC
130
and
131
.
The CN
200
includes MSC
210
and
220
connected with a VLR(Visited Location Register) for registering and managing a subscriber position information and transferring and switching a radio transfer by managing and controlling the RNC
130
and
131
of the RAN
100
, and a GMSC (Gateway MSC)
230
connected with the HLR(Home Location Register) or the GLR(Gateway Location Register) for connecting the MSC
210
and
220
to other network.
The MSC
210
and
220
include SSF(Service Switching Functions)
211
and
221
for analyzing a service from the IN
300
as an Asynchronous Transfer Mode (ATM) and transferring a proper work request to the CCF, CCF(Call Control Functions)
212
and
222
for transferring a service request message to the SSF
211
and
221
and processing a service request transferred from the SSF(
211
and
221
), SACF(Service Access Control Functions)
213
and
223
for managing and controlling a non-call related mobile service, and ARF
214
and
224
for managing a handover between the MSC
210
and
220
.
The IN
300
includes a SCP(Service Control Point)
310
having a service control logic, a SDP(Service Data Point)
311
having a data used for performing various services, and an IP(Intelligent Peripheral) having a service resource such as a voice post box.
In the conventional IMT-2000 network system, the handover method between MSC using the anchor method will be explained.
In
FIG. 1
, two MSC
210
and
220
and the MT
110
and
111
connected thereto are seen, and the RAN
100
may include a plurality of MT, BTS and RNC, and the CN
200
may include a plurality of MSC.
As the MT
110
is moved, if a handover is required from the MSC
210
in which the MT
110
controls the BTS
120
and the RNC
130
to the MSC
220
of the other managing region, the MSC
210
sets a new connection to the MSC
220
of the other managing region via the ARF
214
.
Thereafter, in the MSC
220
, the handover of the MT
110
is performed via the ARF
224
in accordance with a handover request of the MSC
210
for thereby managing a radio resource and call of the MT
110
.
Namely, in order to perform the handover of the MT
110
, the MSC
210
should continuously perform the call management and should make a new connection to the MSC
220
.
However, in the handover implemented using the anchor method between the MSC, the MSC connected is increased whenever the MT continuously performs the handover, so that the consumption of the link resource between the MSC and the resource of the call processor are increased.
In other words, whenever the handover is performed, the transfer link should be allocated to a new MSC. Therefore, when the MT occupying the channel of a wide band often requests the handover, it is impossible to prevent an over consumption of the transfer resource.
In addition, since the ARF is additionally required for managing the handover for every MSC, the MSC is needed separately from the MSC of a wire-based network for implementing a connection with the radio network. Furthermore, the construction of the MSC is complicated for thereby increasing a fabrication cost.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a handover method between mobile switching centers using an intelligent network and an IMT-2000 network system adapting the same which overcome the aforementioned problems encountered in the conventional art.
It is another object of the present invention to provide a handover method between mobile switching centers using an intelligent network and an IMT-2000 network system adapting the same which are capable of decreasing the consumption of a transfer resource by performing a handover between the MSC using an IN of an IMT-2000 network system without varying an interface protocol between a MSC and an IN in a CN and decreasing the fabrication cost using an ATM MSC formed of a SSF and CCF for thereby implementing a proper traffic distribution based on a non-hierarchial IMT-2000 network system through the MSC having the same structure in which a gateway MSC is not used.
In order to achieve the above objects, there is provided an IMT-2000 network system adapting a handover method between mobile switching centers using an intelligent method which includes a plurality of RVC each formed of a RACF (Radio Access Control Function) for managing a radio resource and call, an ARF(Access Link Relay Function) for performing an anchor handover between the RNC, and a SACF(Service Access Control Function) for managing and controlling the service, and a plurality of MSC including a SSF(Service Switching Function) for analyzing a service transferred from each of IN and transferring a proper work request to the CCF(Call Control Function) and a CCF for transferring a service request message to the SSF and processing a service request transferred from the SSF wherein the IMT-2000 network system comprises a RAN(Radio Access Network) including a plurality of MT (Mobile Terminal), a plurality of BTS (Base Terminal Station) connected with a plurality of the MT based on a wireless connection for controlling the MT, and a plurality of RNC(Radio Network Controller) for controlling a plurality of the BTS, a CN(Core Network) which is connected with a VLR(Visited Location Register) and HLR/GLR(Home Location Register/Gateway Location Register) and includes a plurality of MSC (Mobile Switching Center) which registers and manages the RNC in the RAN for thereby transferring and exchanging a radio resource and performs a high speed transfer function and exchanging function with respect to a multimedia service, and an IN(Intelligent Network) including a SCP(Service Control Point) provided with a service control logic, a SDP(Service Data Point) provided with a data used for a service, and an IP(Intelligent Peripheral) provided with a service resource for thereby providing various multimedia services.
In order to achieve the above objects, there is provided a handover method between mobile switching centers using an intelligent network which includes the s

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