AU771191B2 - Method for setting up call in wireless local loop system - Google Patents

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S): LG Information Communications, Ltd.

ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Little Collins Street, Melbourne, 3000.

~+oo INVENTION TITLE: Method for setting up call in wireless local loop system The following statement is a full description of this invention, including the best method of performing it known to me/us:- BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a WLL(Wireless Local Loop) system, and more particularly, to a method for setting up a call in a WLL system, which is suitable for setting up a call by usifig an overlap dialing during off hook of a station.

Background of the Related Art In general, the WLL system has a wireless subscriber line between a subscriber and a base station, which can provide audio communication services, facsimile services, and data oo communication services. The WLL system has been started to be developed in full scale as problems of a frequency efficiency, a radio channel quality, build up cost per a subscriber are o• ~solved when the semiconductor, and the radio communication technologies developed in 1980s are combined with the radio frequency technology developed in 1970s. In comparison to a conventional wire network, since the WLL system has advantages in that the build up cost and time, and the maintenance cost are low, and can provide a variety of services, such as an excellent communication quality, data, and an ISDN(Integrated Service Digital Network) and the like, the WLL system can be applicable to a case when a new communication service provider intends to secure a subscriber network quickly, or used as a communication infra structure of a developing country which has a poor wire communication network. Basically, the WLL system is provided with telephone sets and an NIU(Network Interface Unit) which makes a radio -\fJ communication between the telephone sets and a switchboard possible. There are a separate type WLL system and a integrate type WLL system in the WLL system. The separate WLL system is provided with an NIU for wire connection to a stationary telephone so that the subscriber who has the stationary telephone set connected to an existing wire network can buy, not a telephone set, but the NIU only when the subscriber subscribes to the WLL system. And, the integrated WLL system is provided with the telephone set and the NIU integrated in hardware basis for the convenience of the subscriber who has no stationary telephone set in subscription to the WLL system. FIG. 1 illustrates related art separate type and integrate type WLL systems.

Referring to FIG. 1, the related art separate type and integrate type WLL systems are provided with a stationary telephone set 10 installed in a house or office, an NIU 20 connected i to the stationary telephone 10 for transmission/reception of information over a radio interface, an integrated type telephone set 30 having the NIU 20 built-in, a base station 40 for connection to the NIU 20 or to the integrated type telephone set 30, a base station controller 50 wire connected to the base station 40 for processing a call and transmitting a message, and an operation apparatus 130 for operating and maintaining the WLL system. The base station Scontroller 50 is connected to a switching center .oooo: The operation of respective units of the aforementioned WLL system will be explained.

S.The NIU 20, connected to a last stage of the WLL system, conducts radio frequency transmission/reception functions for transmission/reception of information over a radio interface, a base band signal processing function for conducting a function for transmitting a signal converted from radio frequency into a base band to the subscriber and a function reverse of the foregoing function, a function for processing a signal protocol with a communication network, and a function for processing an audio signal. And, the base station 40 makes radio connection to the NIU 20 or the integrated type telephone set 30, to processes a radio frequency signal to conduct functions of radio signal modulation/demodulation, and channel coding /decoding, and is wire connected to the base station controller 50 through a particular trunk(EI/HDSL). The base station controller 50 is positioned between the base station 40 and the switching center 70 for controlling various base stations, and conducting a signal message transmission function, a call processing function, a code converting function, and an interfacing function between the base station and the switching center 70. The operating apparatus 60 is in charge of operation and maintenance of the NIU 20, the base station 40, and the base station controller 50, and conducts a network system managing function, network element managing function, a performance 0 managing function, a data processing function, a software managing function, and a security managing function.

The transmission operation of the aforementioned WLL system will be explained.

First, an originating side subscriber inputs a destination telephone number to the stationary telephone 10. Then, the NIU 20 connected to the stationary telephone 10 receives, the ."015 destination number, modulates into a radio frequency, and transmits to the base station 40. In this instance, under the present radio environment, the NIU 20 transmits the destination 0 telephone number to the base station 40 en- bloc, or functional address signaling, wherein Os..

incoming destination telephone number is stored in a memory in succession, and the stored destination telephone number is transmitted to the base station at one time by means of an originating operation, such as pressing a "SEND" key or transmitting after a preset time is lapsed, or the like. The integrated type telephone station 30 also transmits the destination telephone number to the base station en-bloc once the destination telephone number is provided thereto.

Then, the base station 40 transmits the destination telephone number to the switching center 29- 1-04:17!42 ;Davies Collison Cave :139520 /1 ;61 3 92542808 5/ 16 -4and the switching center 70 determines the destination subscriber of being within its own area or an area of other switching center, to deternine a communication path, and transmits a signal for setting up the conununication path and the data to the destination subscriber, to set up a call between the origination subscriber and the destination subscriber.

However, the aforementioned WLL system has the following problems.

First, there has been inconvenience of the additional pressing of 'Send" button, or other originating operation required for the en-bloc transmission in the call set up after the originating subscriber presses all the destination telephone numerals.

Second, the delay before completion of call set up, starting from assignment of communication channel to connection. of a communication pat between subscribers, coming from such a pressing of 'SEND'- button or other originating operation causes a delay in a communication service.

SUMMARY OFTMEJINVENTION According to the present invenition, there is provided a method for setting up a call go in a WLL system having at least one personal station., a base station and a switching center, *the method comprising:.

if the personal station is in an off hook state, transmitting an origination message to the base station by the persona] station; assigning a traffic channel between the personal station and the base station; receiving first and second portions of a destination telephone number input at the ****personal station; transmitting at least one of the first and second portions of the destination telephone number to the base station in real time, said real time transmission including transmitting at least one of said portions to the base station without firstly storing the portions in a *memory of the personial station; and connecting a call to a destination personal station when all digits of the destination telephone number are received by the switching center.

The invention also provides a method for setting up a call in a W~LL system having at least one personal station, a base station and a switching center, the method comprising: COMS ID No: SMBI-00591648 Received by IP Australia: Time (I-tm) 17:47 Date 2004-01-29 29- 1-04;17:42 ;Davies Collison Cave :138520 /1 ;61 3 92542808 6/ 16 if the personal station is in an off hook state, transmitting an origination message to the base station by the personal station; assigning a traffic channel between the personal station and the base station; receiving first and second portions of a destination telephone number input at the personal station; transmitting at least one of the first and second portions of the destination telephone number to the base station in real time over a traffic channel, said real time transmission including transmitting at least one of said portions to the base station without firstly storing the portions in a memory of the personal station; and connecting a call to a destination personal station when all digits of the destination telephone number by the switching center.

The invention also provides a method for setting up a call in a WLL system, comprising: detecting an off hook state; and 15 transmitting at least one digit of a destination telephone number from a personal station to a base station in real time, said real time transmission including trasmitting at least one of first and second portions of a destination telephone number input at the personal stationto the base station without firstly storing the portions in a memory of the personal station.

Embodiments of the present invention are directed to a method for setting up a call in a WTLL system that at least in part obviates one or more of the problems due to limitations and disadvantages of the related art.

99~~Embodiments of the present invenition provide a method for setting up a call in a WLL system, which may reduce a call setting up time period and reduce the inconvenience of pressing "SEND" button.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide ftuther explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the COMS ID No: SMBI-00591 648 Received by IP Australia: Time 17:47 Date 2004-01-29 29- 1-04:17:42 ;Davies CollI son Cave :6 2480 /1 ;61 3 92542808 71/ 16 P,'ERTVKfl3tS2I1 rgdcddcc.doy294tO -6invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the descriptioni serve to explain the principles of the invention: In the drawings: FIG. 1 illustrates related art separate type and integrate type WLL systems; FIG. 2 illustrates a flow chart showing the steps of a method for setting up a call by using overlap dialing in accordance with a first preferred embodiment of the present invention; FIG. 3 illustrates a flow chart showing the steps of a method for setting up a call in accordance with a second preferred embodiment of the present invention; and FIG. 4 ilIlustrates a procedure for transfer of messages between a mobile station and a base station in setting up a call in accordance with a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

:First Embodiment COMS ID No: SMBI-00591648 Received by IP Australia: Time 17:47 Date 2004-01-29 FIG. 2 illustrates a flow chart showing the steps of a method for setting up a call by using overlap dialing in accordance with a first preferred embodiment of the present invention. The method for setting up a call in a WLL system can be applicable both to an integrate type mobile station having an NIU for a related art WLL system built-in therein and a separate type mobile station having an NIU radio/wire connected to a stationary telephone set.

Referring to FIG. 2, the method for setting up a call in a WLL in accordance with a first preferred embodiment of the present invention starts with checking a hook state of a mobile station for detecting of an origination call. If the mobile station is in an off hook state, an origination message is transmitted to the base station by using an access channel immediately, and attempt to obtain a traffic channel(S200). In this instance, the origination message contains no destination telephone number digits, and, as shown in FIG. 4, a procedure for transfer of the origination message between the mobile station and the base station is identical to J-STD-008 o defined in the related art CDMA system. Then, the base station receives the origination message and assigns a communication channel(S210). In this instance, the destination telephone number the origination side subscriber inputs before assignment of a traffic channel is stored in a memory i of the mobile station. Then, when the traffic channel is assigned, the mobile station transmits the destination telephone number stored in the memory to the base station in a burst DTMF o*o message(S220), and transmits the destination telephone number received after the traffic channel is set up to the base station in real time on the same time with the input one by one in the burst DTMF message(S230). Upon reception of the destination telephone number, the base station transmits the destination telephone number to a switching center, and the switching center connects the call to the destination subscriber according to the destination telephone number according to the destination telephone number. Then, the base station detects the call connection P:~%pekatsso8803-o0.d-o30/11/00 -8- 0

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0 0 0 0*0* 0 0* 0* of the switching center, and the switching station provides a ring back tone or busy tone toward the origination mobile station, to inform a call connection with the destination subscriber, thereby completing a call set up (S240).

Second Embodiment In the meantime, FIG. 3 illustrates a flow chart showing the steps of a method for setting up a call in accordance with a second preferred embodiment of the present invention.

Referring to FIG. 3, the method for setting up a call in accordance with a second preferred embodiment of the present invention starts with checking a hook state of the mobile station, and, if the mobile station is in an off hook state, different from the first embodiment of the present invention, an origination message is not transmitted immediately, but input of a first digit of a destination telephone number is waited.

That is, the traffic control channel includes a primary traffic having a voice or data channel, and a signaling traffic having a control channel. In the present invention, the 15 destination telephone number is transmitted over the signaling traffic of the traffic channel.

Although the destination telephone number may be transmitted over the primary traffic in the present invention, for transmitting over the primary traffic, the personal station should generate a frequency tone of the DTMF through a vocoder in the personal station, encode the frequency tone of the DTMF to the base station, and the base station should decode the frequency tone of the DTMF received from the personal station.

Therefore, if the destination telephone number is transmitted over the primary traffic, probability of error occurrence is high. On the other hand, if the destination telephone number is transmitted over the signaling traffic, since the personal station transmits the destination telephone number in a burst DTMF message type, it is not required to encode or decode. Therefore probability of error occurrence is low.

That is, the mobile station waits for the first digit of the destination telephone number without taking any further step. Then, once input of the first digit of the destination telephone number is detected, the mobile station transmits the origination message to the base station, and attempts to obtain a traffic channel(S300), and the destination numbers received before assignment of the traffic channel is stored in a memory of the mobile station. The method for setting up a call in accordance with the P:'ocrkat\4803-0oa.doc.30/l 1/00 -8Asecond embodiment of the present invention is the same with S210-S240 explained in connection with Fig. 2, which is the first embodiment of the present invention. That is, upon assignment of a traffic channel (S310), the mobile station transmits the destination telephone number stored in the memory before that time to the base station in burst DTMF message (S320), and transmits the destination telephone number received after the traffic channel is set up to the base station one by one in an burst DTMF message (S330). Upon reception of all the destination telephone number through the base station, the switching center connects a call to a destination subscriber, and provides a 0* 5*

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S* ring back tone or busy tone to the origination mobile station, to inform the call connection with the destination mobile station, thereby completing a call set up(S340).

Third Embodiment As another embodiment, though not shown in the drawing, an origination message may be transmitted, not upon detection of a first digit of a destination telephone number like the second embodiment, but upon detection of a second, a third, or a digit thereafter, of the destination telephone number.

FIG. 4 illustrates a procedure for transfer of messages between a mobile station and a base station in setting up a call in accordance with a preferred embodiment of the present invention.

0. 910 Referring to FIG. 4, in an off hook state of the mobile station, an origination message is transmitted to a base station according to the overlap dialing defined in J-STD-008. That is, in an off hook state, the mobile station transmits an origination message to the base station through o an access channel in an attempt to obtain a traffic channel, and, after assignment of the traffic channel, the base station transmits a channel assignment message for the traffic channel assignment to the mobile station through a paging channel. In this instance, the origination message contains no digits for the origination message. Then, the traffic channel is connected between the mobile station and the base station in a service option and the mobile station transmits the destination telephone number to the base station by using a reverse traffic channel.

In this instance, the destination telephone number the user inputs before the assignment of the traffic channel is stored in a memory of the mobile station, and transmitted to the base station through a reverse traffic channel in a burst DTMF message after assignment of the traffic channel. And, the destination telephone number the user inputs after the assignment of the traffic channel is transmitted to the base station in real time on the same time with the input, in this time 4 too, through the reverse traffic channel in a burst DTMF message.

As has been explained, the method for setting up a call in a WLL system of the present invention has the following advantages.

First, the inconvenience caused by additional pressing of'SEND' button in a WLL system is not required for the subscriber as an originating mobile station generates an origination message immediately in an off hook state, is assigned of a traffic channel with a base station, and transmits a destination telephone number by using the overlap dialing.

Second, alike the case when the subscriber uses a general wire telephone, a delay time in the call set up can reduced, with a quicker communication service made available, as a .O communication is set up as soon as a last destination telephone number is pressed.

It will be apparent to those skilled in the art that various modifications and variations can Sbe made in the method for setting up a call in a WLL system of the present invention without

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departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of oo•• 5 the appended claims and their equivalents.

S" Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or •o ~steps but not the exclusion of any other integer or step or group of integers or steps.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in Australia.

Claims (1)

1. 29- 1-04:17!42' ;Davies Colison Cave :139520 /1 ;61 3 92542808 B/ 16 THE CLAIMS DARNING THE INVENTION ARE AS FOLLOWS:- 1. A method for setting up a call in a WLL system having at least one personal station, a base station and a switching center, the method comprising: if the personal station is in an off hook state, transmitting an origination message to the base station by the personal station; assigning a traffic channel between the personal station and the base station; receiving first and second portions of a destination telephone number input at the personal station; transmitting at least one of the first and second portions of the destination telephone number to the base station in real time, said real time transmission including transmitting at least one of said portions to the base station without firstly storing the portions in a memory of the personal station; and connecting a call to a destination personal station when all digits of the destination telephone number are received by the switching center. 2. The method of claim 1, wherein the transmitting step includes: storing the first portion of the destination telephone number in the personal station; and .9.,.upon assignment of the traffic channel, transmitting the first portion of the destination telephone number stored in the personal station to the base station, and transmitting in real time the second portion of the destination telephone number received after the assignment of the traffic channel to the base station thereafter. The method of claim 2, wherein the second portion of the destination telephone number received after assignment of the traffic channel is transmitted digit-by-digit in real time. 4. A method as claimed in claim 1, wherein the destination telephone number is transmitted from the mobile station'to the base station in a burst DTMF message. A method for setting up a call in a WLL system having at least one personal station, a base station and a switching center, the method comprising: COMS ID No: SMBI-00591648 Received by IP Australia: Time 17:47 Date 2004-01-29 29- 1-04;17:42 :Davies Collison Cave :139920 /1 :61 3 92542808 S/ 16 -12- if the personal station is in an off hook state, transmitting an origination message to the base station by the personal station; assigning a traffic channel between the personal station and the base station; receiving first and second portions of a destination telephone number input at the personal station; transmitting at least one of the first and second portions of the destination telephone number to the base station in real time ovar a traffic channel, said real time transmission including transmitting at least one of said portions to the base station without firstly storing the portions in a memory of the personal station; and connecting a call to a destination personal station when all digits of the destination telephone number by the switching center. 6. The method of claim 1, wherein the transmitting step includes: storing the first portion of the destination telephone number in the personal station; and upon assignment of the traffic channel, transmitting the first portion of the *'15 destination telephone number stored in the personal station to the base station, and V.a transmitting the second portion of the destination telephone number received after the :assignment of the traffic channel to the base station thereafter. The method of claim 6, wherein the second portion of the destination telephone number received after assignment of the traffic channel is transmitted digit-by-digit in real time. 8. The method of claim 5, wherein the destination telephone number is transmitted from the personal station to the base station in a burst DTMF message. The method ofclaim 5, wherein the sgnaling traffic include Is a control channel. *V 10. The method of claim 1, wherein the receiving step includes: receiving the first portion of the destination telephone number before assignment of the traffic channel and storing the first portion in a memory; and receiving the second portion of the destination telephone number after assignment of the traffic channel. COMS ID No: SMBI-00591648 Received by IP Australia: Time 17:47 Date 2004-01-29 29- 1-04;17!42 ;Davies Collison Cave:6392488 #1/6 :61 3 92542808 10/ 16 13 11. The method of claim 10, wherein the transmitting step includes: transmitting the first portion of the destination telephone number stored in the memory; and transmitting the second portion of the destination telephone number to the base station in real time. 12. The method of claim 1, wherein the origination message is transmitted before any digit of the destination telephone number is input at the personal station. 13. The method of claim 1, wherein the origination message is transmitted after the first portion of the destination telephone number is Input at the personal station. 14. A method for setting up a call in a WLL system, comprising: detecting an off hook state; and transmitting at least one digit of a destination telephone number from a personal station to a base station in real time, said real time transmission including transmitting at least one of first and second portions of a destination telephone number input at the station to the base station without firstly storing the portions in a memory of the personal station. The method of claim 14, further comprising: transmitting an origination message from the peronal station to the base station; and 'receiving acknowledgement that a traffic channel has been assigned :2.wherein the origination message is transmitted before said at least one digit of the destination telephone number is transmitted to the base station in real time. 16. The method of claim 15, wherein the origination message is tmansmitted after :detection of the off hook state but before any digits of the destination telephone number are dialed. 17. The method of claim 15, wherein the origination message is transmitted when a first digit of the destination telephone number is dialed. COMS ID Na: SMBI-00591648 Received by IP Australia: Time 17:47 Date 2004-01-29 S I P: OPER'KL'4S803--r) ip.2 dTwI-22 VS (l3 -14- 18. The method of claim 15, wherein the origination message is transmitted when two or more digits of the destination telephone number are dialed. 19. A method for setting up a call, substantially as hereinbefore described with reference to the drawings. DATED this 22nd day of August, 2003 Lg Information Communications, Ltd. 0 By DAVIES COLLISON CAVE Patent Attorneys for the applicant