Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-12-30
2002-07-23
Chang, Vivian (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S517000, C455S567000
Reexamination Certificate
active
06424835
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for controlling a call in a communication system.
2. Discussion of the Related Art
In CDMA (Code Division Multiple Access) call processing methods, there are generally two methods for transmitting a dialed number to a system (or BTS =base transceiver subsystem) when a user makes a call. Specifically, there are an en-bloc or functional address signaling method, and an overlap or stimulus address signaling method.
In the enbloc address signaling, a station is provided with a processor for processing a portion of call processing function for itself without help from a communication network. This signaling method is used in ISDN's or mobile communication networks of recently developed communication service networks. Using this method, the station stores information regarding a number dialed by a user applied and transmits the stored information at a time when the user presses a “send” button. In other words, the en-bloc address signaling is a signaling method in which the address digits are assembled into one block for onward transmission, the block containing all of the address information necessary to route the call to its destination.
In the overlap address signaling, a call is processed under the control of a switchboard without any processing function of its own. In this signaling, when the user lifts a receiver, the switchboard senses this and transmits a dial tone. Then, when the user dials, the switchboard senses every dialed number and controls the call. That is, the overlap address signaling is a signaling method in which the onward transmission of address of address signals from a mobile switching center may commence before the reception of all the address signals over the preceding link has been completed. This method is similar to that of a PSTN. En-bloc address signaling is more efficient to transmit the address signal, but in this signaling a calling user is required to input the “send” button as above mentioned.
The call control between a mobile station and a BTS in a CDMA mobile communication system is conducted according to an en-bloc address signaling defined in standards of EIA/TIA IS-95 and ANSI J-STD-008.
FIG. 1
illustrates a WLL-CDMA mobile communication system.
Referring to
FIG. 1
, a WLL (Wireless Local Loop) system is provided with FSUs (Fixed Subscriber Units)
10
, BTSs
11
, and a WLL BSC (Base Station Controller)
12
. A CDMA system is provided with FSUs
10
, mobile stations, BTSs
11
, a base station manager
14
, a CDMA BSC
15
, a mobile switching center (MSC)
16
, and an HLR (Home Location Register)
17
. The FSU
10
corresponds to the mobile station of a radio station, and the STS
11
is a radio interface connecting the mobile station and the BSC
12
. The BSC
12
controls the BTSs
11
, processes vocoding of a voice packet, and conducts an interfacing function in which the mobile station subscriber is connected to a PSTN. Particularly, the BSC
12
or
15
accommodates a plurality of BTSs
11
. A radio communication is made between the BTS
11
and the mobile station
13
until a time when a radio traffic channel is set up. However, once the radio traffic channel is set up, radio communication is made between the mobile station
13
and the BSC
12
or
15
. In order to explain a signal processing procedure to/from the mobile station
13
, in general, the BSCs
12
and
15
and the BTS is called as a base station (BS), collectively. The BSCs
12
and
15
are connected to a BSM (Base Station Manager)
14
for system management and maintenance. And, as shown in
FIG. 1
, the CDMA system is further provided with a MSC
16
for number interpretation and switching and an HLR
17
for location management of the mobile stations
13
.
FIG. 2
illustrates a standard procedure for processing a call between a mobile station (MS) and a base station (BS) defined in a CDMA system standard. The standard procedure for processing a call between the MS and the BS is as follows. When a mobile station
13
transmits a mobile origination message containing all numerals dialed by a user toward the BS through an AC (Access Channel), which is a reverse channel (
201
), the BS transmits a BS acknowledge order for the mobile origination message toward the MS through a PC (Paging Channel), which is an forward channel (
202
). That is, the mobile origination message is a signal for requesting an initiation of a call, and the BS acknowledge message is a message informing an orderly reception of the mobile origination message.
Then, radio sources required for processing the call are assigned between the BTS and the BSC in the BS. Then, a null traffic signal is transmitted from the BTS toward the MS through the traffic channel which is an assigned forward channel (
203
), for informing an availability of the assigned traffic channel. A channel assignment message containing all assignment information is provided from the BTS in the BS toward the MS through the paging channel (
204
). The channel assignment message contains a CDMA channel of the assigned 1.25 MHz band frequency, a code channel of radio traffic channel, and frame offset information to match a synchronization for load spreading, and etc. Then, a traffic channel (TC) link is set up between the BTS and the BSC in the BS. Then, the MS provides a traffic channel preamble signal, a preliminary signal, to the BTS in the BS through the traffic channel to the BTS assigned according to the channel assignment message (
205
). As explained, since there is the TC link set up between the BTS and BSC, the BSC provides a BS acknowledge order to the MS through a forward traffic channel in response to the TC preamble (
206
), and the terminal, i.e., the MS, acknowledging the forward traffic channel, provides an MS acknowledge order which permits to acknowledge an reverse traffic channel to the BSC (
206
).
After recognition of such data, the BTS and BSC transmit a responsive signal (
207
). Thus, both a forward traffic channel and a reverse traffic channel are set up between the MS and the BSC. Then, the BSC in the base station provides a service connect message, informing a requested service is available, to the MS (
208
), and, in response to the service connect message, the MS provides a service connect complete message which acknowledges the service connect message to the BSC (
209
). In this instance, the MSC provides a ring back tone to the MS through the BSC (
210
). As has been explained, a traffic channel is set up through a procedure of confirming service options between the MS and the BS, and the MS receives a ring back tone over the traffic channel.
As shown in
FIG. 1
, the FSU
10
in a related art WLL-CDMA communication system is provided with a “send” button for processing a call in en-bloc address signaling method identical to a general CDMA communication system. When a user lifts a transceiver and dials, the FSU
10
stores the number dialed by the user, and starts to provide the stored number to abase station at a time when the “send” button is pressed by the user. On reception of the number, the BS controls the call in interface with the BSCs
12
and
15
and the MSC
16
using the aforementioned standard procedure between the MS and the BS. A related art WLL communication system is a PSTN in which a wireline telephone system is replaced. Therefore, users in the related art WLL system use terminals in the same way as the terminals used in the wireline telephone system. However, in a WLL-CDMA system, the en-bloc address signaling is used in processing a call between the related art FSU and the system. Therefore, a call set up is started when the user presses a “send” button after the user in the WLL-CDMA communication system finishes dialing of all the numerals or after a preset time period elapses.
The WLL system is a communication system employed by users who need to make a fast communication between people working in a limited area like airport guards. Therefore, the en-bloc address signalin
Chang Vivian
Fleshner & Kim LLP
LG Information & Communications Ltd.
Moore James
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