Connect public, paid and private patent data with Google Patents Public Datasets

Method and apparatus for determining dialed number digit length in fixed wireless telecommunication networks

Info

Publication number
WO1999057921A1
WO1999057921A1 PCT/SE1999/000710 SE9900710W WO1999057921A1 WO 1999057921 A1 WO1999057921 A1 WO 1999057921A1 SE 9900710 W SE9900710 W SE 9900710W WO 1999057921 A1 WO1999057921 A1 WO 1999057921A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
call
number
setup
telephone
phone
Prior art date
Application number
PCT/SE1999/000710
Other languages
French (fr)
Inventor
Per-Arne Sandegren
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/14WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

In a fixed wireless network such as a wireless local loop (WLL) network, a method for an improved call setup procedure is disclosed. The method includes detecting when a telephone set is taken off-hook by a caller, and wherein in response, a simulated dial tone is generated in the telephone set receiver. When the caller enters a phone number to the called party, a sequence of the first three digits, for example, is compared to a predetermined list of sequences stored in a look-up table. The length of the phone number is identified by matching the sequence with its associated length in the look-up table prior to the conclusion of dialing. The call setup procedure is initiated by sending the entered digits to the switching center for processing immediately after the last digit has been entered. In a first embodiment, if no sequence match is found, a 'time-out' procedure is performed to determine when the last digit has been entered in order to initiate call setup. In a second embodiment, a connection is alternatively established to the switch when no sequence is found. The call setup procedure of the present invention, when a match is found, enables efficient use of the radio spectrum by not requiring an immediate connection to the switch during dialing thus potentially enhancing network capacity. Moreover, the method eliminates the need for the caller to press 'send' at the conclusion of dialing making the calling experience more closely resemble that of traditional wireline service.

Description

Method And Apparatus for Determining Dialed Number Digit Length in Fixed Wireless Telecommunication Networks

FIELD OF THE INVENTION

The present invention relates generally to radio based wireless telecommunication networks such as a Wireless Local Loop. More specifically, the invention relates to a technique for determining the digit length prior to the conclusion of dialing in order to automatically initiate call setup.

BACKGROUND OF THE INVENTION

An increasingly popular form of a wireless telecommunication network is a fixed radio network, more commonly known as a wireless local loop (WLL). A significant motivation toward the growing adoption of WLLs is its relative simplicity and cost advantage with regards to their installation over traditional wireline networks. The relative high cost of installing a wireline network, also referred to as a public switched telephone network (PSTN), is typically associated with the installation of transmission lines and related equipment. This is especially the case in rural and other sparsely populated areas where the cost of installing a relatively few lines over vast distances can be very high. Therefore, given the cost consideration for setting up a new telecommunication network, many operators opt for a fixed radio based solution such as a WLL which, when coupled to the PSTN, provides subscribers proficient access to telecommunication services.

Since the use of radio transmission service in place of wireline service delivers considerable savings on infrastructure costs, WLLs have typically found acceptance in a number of areas where setup and installation costs are of primary concern. These include areas where it is desired to expand existing telecommunication capacity both quickly and cheaply. Another possible application may include uses where localized or internal communications are required. These internal communications can be routed through a private branch exchange (PBX) which directs calls to the correct party within the localized environment. Communication with external entities may be achieved by linking the PBX to the PSTN. A telecommunication infrastructure of this type may be desirable at remote sites constructed for operation for either short term (as well as long term) use such as oil production sites and remote research locations, for example.

WLL networks and standard wireless mobile telecommunication networks operate in many ways that are functionally similar. For example, a radio path is used as the communication link between a transceiver unit and a serving base station (BS) operates in place of wired lines. The telephone set is coupled to the transceiver unit which is in wireless communication with the BS. Consequently, many WLLs operate in accordance with existing standards based on Time Division Multiple Access (TDMA) technologies such as Digital Advanced Mobile Phone System (D-AMPS) and Global System for Mobile Communication (GSM), in addition to those based on Code Division Multiple Access (CDMA) technology. Therefore, they both share many of the advantages, such as relatively low installation costs and untethered access to telecommunication services and disadvantages, such as relatively long call setup times that are typically inherent with current radio based communications.

As those familiar with the technology are aware, the technique for placing a call with a radio based network differs significantly from placing a call with the traditional PSTN network. In particular, the WLL call setup procedure is considerably different from the call setup procedure in a traditional PSTN thereby leading to a significant variation in the calling experience to the user. One significant difference with the WLL call setup is a noticeable delay from the time a user dials the number to when the connection is finally made. This delay is typical in radio based communication systems, such as cellular networks, because a link to the switching center (or exchange) is not normally immediately established upon dialing by the user such that the radio spectrum is not tied up during dialing. In a typical call setup procedure in a radio based network, the caller enters a series of digits, representing the telephone number of the desired party, which are stored as digital data within the telephone set. The digits are subsequently transmitted to the switching center for processing when the caller presses the 'send' key. This enables the scarce resources of radio spectrum to be used in an efficient manner. When the appropriate checks are completed, and if it is determined that the connection can be made, a voice channel is allocated for the call. This procedure may take several seconds and adds to the perceived delay to the caller. This is in contrast to a call setup procedure in a traditional wireline system where a direct connection to the switch is made immediately upon taking the phone off-hook.

Efforts at improving the call setup procedure have been made in the prior art. One approach is to monitor the time elapsed between dialed numbers in an effort to determine when the user has entered the last digit such that the number can automatically be sent to the switch for processing. This method is referred to as the "time-out" method and works by concluding that the dialing has terminated when a preset time has elapsed. But the disadvantage of this technique is that the elapsed time imposes an additional delay during call setup. A further discussion of this and other techniques dealing with call setup are provided in PCT International Publication No. WO 96/32824 entitled: A Radio Unit And A Method For Connecting A Fixed Subscriber Station to a WLL System, published on 17 October, 1996.

In view of the foregoing, it is an objective of the present invention to provide a method of eliminating the caller action of pressing 'send' at the conclusion of dialing such that an immediate connection to the switch is not established while dialing. This permits more efficient use of the radio spectrum during the call setup procedure thereby conserving bandwidth. A further objective is to reduce the delay in the call setup procedure as compared to prior art methods employing the "time-out" procedure for determining dialing digit length to provide a more consistent calling experience in fixed wireless environments as compared with traditional wireline. SUMMARY OF THE INVENTION

Briefly described, and in accordance with an embodiment thereof, the invention discloses a method of determining the length of a phone number prior to the conclusion of dialing, and prior to making a connection to the switch, by a caller in order to automatically initiate a call setup procedure. The method disclosed includes detecting when a caller takes a standard telephone set off-hook, for example, by lifting up the receiver. In response to the off-hook condition, a simulated dial tone is generated by a transceiver station coupled to the telephone receiver such that the dial tone is audibly perceived by the user. The caller enters a series of digits representing the telephone number of the desired party and whereby a sequence of, for example, the first three digits entered are compared to a predetermined list of sequences stored in a look-up table in a memory in the transceiver station coupled to the telephone set. The digit length of the phone number is identified by retrieving the digit length associated with the matched sequence, which is also stored in the memory, prior to the conclusion of dialing by the caller. The call setup procedure is initiated by sending the entered digits to the switching center for processing immediately after the last digit has been entered. If the sequence could not be identified in the comparison step, in a first embodiment, a "time-out" procedure is performed to determine when the last digit has been entered in order to initiate call setup. In a second embodiment, a connection to the switch is established in a process that is similar to the traditional wireline technique to complete the call.

The present invention provides a technique that improves the call setup procedure in a fixed wireless environment, for example, a wireless local loop such that the calling experience is comparable to that when making a traditional wireline call. Furthermore, bandwidth is not used while dialing thereby enabling more efficient use of the radio spectrum. A further aspect is that the invention also removes the need for the caller to press 'send' after entering the phone number and, in some cases, eliminates the - 5 -

delay associated with the "time-out" procedure when a sequence match is found. These and other advantages of the present invention will become apparent upon reading the following detailed descriptions and studying the various figures of the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings in which:

Fig. 1 depicts an exemplary simplified wireless local loop (WLL) network;

Fig. 2a shows a flow diagram illustrating a process for call setup operating in accordance a first embodiment of the present invention;

Fig. 2b shows a flow diagram illustrating a process for call setup operating in accordance a second embodiment of the invention; and

Fig. 3 shows an exemplary look-up table that can be used in the embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Fig. 1 depicts an exemplary simplified radio based wireless local loop (WLL) network. The WLL comprises a telephone set 100 that operates by using standard Dual Tone Multiplexed Frequency (DTMF) dialing tones is coupled to a transceiver station 102. The telephone set 100 is typically a standard telephone set that is used with traditional wireline phone service for improving the cost effectiveness of the network. A simulated dial tone is generated by the transceiver station 102 in the telephone receiver 100 when the user unhooks the phone. The simulated dial tone is presented as an aid to the caller so that the telephone set 100 more closely resembles the operation of a traditional wireline phone. The transceiver station 102 includes all necessary logic and is capable of two way radio communication over air interface 103 with a proximately located base station (BS) 104. A mobile switching center (MSC) 106 is then coupled to the BS 104 by digital communication link 108. It should be noted that a typical WLL network comprises a plurality of BSs and that the single BS arrangement shown is for purposes of illustration. Furthermore, a plurality of telephone sets may be coupled to transceiver station 102 and are not shown for like reasons.

The WLL network may be operating in accordance with an established standard such as, for example, Digital Advanced Mobile Phone System (D-AMPS). In order to complete a call to an outside telephone set 112, MSC 108 is shown connected to the public switched telephone network 114. For connections within a localized environment, such as within a company, a private branch exchange (PBX) may be used in place of the MSC. The operation of radio communications over the air interface 103 includes the transmission of at least one control channel and a plurality of voice channels. The control channel contains command and control signals necessary for communications between the BS and the transceiver station 102 whereas voice channels primarily contain data involved with voice communications. In the air interface, voice channels and control channels may operate in either digital mode, analog mode, or both in accordance with the established protocol of the network. Furthermore, when operating in digital mode, the data relating to the conversation is transmitted within a specified time slot(s) within the radio frequency carrier whereas in analog mode, the data is transmitted within a dedicated frequency carrier.

In accordance with an exemplary concept of the present invention, a method of improving the call setup procedure in a WLL network will be described. The method includes a technique for determining the length of a dialed number by recognizing the initial sequence of numbers entered before dialing is complete. Since a connection to the switch is not established during dialing, this frees up some of the radio spectrum and thus can enhance the capacity of the network. Furthermore, the elimination of the step of requiring the caller to press the 'send' key upon completion of dialing can have the effect on reducing the delay encountered during the call setup process in some cases.

Referring now to Fig. 2a, a flow diagram is shown illustrating the method of operation for call setup of an exemplary first embodiment operating in accordance with the present invention. At step 200, the telephone set (100 in Fig. 1) is taken off-hook by the caller wishing to initiate a call. The off-hook condition is detected by the transceiver station 102 in which a simulated dial tone is generated and sent to the telephone receiver, at step 202, to notify the user that everything is functioning properly and the phone is ready to accept dialing. At step 204, the caller enters the digits of the called party which are stored in a memory in the transceiver station 102 for later transmission to the switch for processing. As the caller enters a sequence of digits, a comparison is made, at step 206, with a sequence and its corresponding digit length which are contained in a look-up table in the transceiver station memory. If the sequence is known, i.e. a sequence match is found in memory, the transceiver station waits to receive the correct number of digits as specified in the look-up table, at step 208. After the correct number of digits has been entered, the transceiver station automatically initiates a 'send' procedure in order open a line to the switch and to transmit the digits for processing (step 212) to complete the call. If the sequence is not known (step 210), i.e. the sequence is not found in memory, then a "time-out" operation is performed in order to determine when the dialing is concluded. The "time-out" operation assumes that the last digit has been entered after a preset time period has elapsed during which no digit has been - 8 -

entered. By way of example, a time period of approximately 5 seconds may be used in which the 'send' is generated if the phone does not receive an entry within the elapsed time.

Fig. 2b illustrates a call setup process operating in accordance with a second embodiment of the invention. The call setup process steps of the second embodiment are substantially identical to that of the first embodiment up to the point of the comparison step 206. As before when a sequence match is found, the transceiver station 102 waits to receive the correct number of digits as found in the look-up table in memory (step 208) prior to initiating call setup shown in step 212. If the sequence is not found, a connection to the switch is established at step 214 such that the call is completed in the conventional manner as in the traditional wireline system, step 216. When the connection is set up, the transceiver station 102 sends the received digit and continues to send received digits as entered by the user. In such an implementation, the delay time is reduced, as compared to using the "time-out" technique, but at the expense of utilizing bandwidth which may potentially lower the capacity of the network. In some applications this tradeoff may be acceptable or even preferable in markets where capacity is not a major issue.

Fig. 3 depicts an exemplary look-up table that can be used in step 206 in accordance with the present invention. The look-up table contains a series of predetermined sequences that are stored along with their corresponding digit lengths. In accordance with a preferred embodiment, a series of three digits is typically sufficient to identify the proper length of the called number. It should be noted that more complicated number schemes may require a longer sequence to identify the length. In some countries, various numbering schemes may be implemented. By way of example, phone numbers of different lengths may be assigned in some areas in which particular lengths are generally associated with a specified three digit prefixes or sequences. For example, in Sweden phone numbers are generally assigned to certain areas of the country or certain locations within a city to be either six or seven digits long. Those phone numbers having six digits are known and can be easily identified by its three digit prefix, as indicated by reference numeral 302. Similarly, those phone numbers having seven digits can be identified through their prefixes (304). The information relating to the prefixes are readily obtainable through the local phone company or telecom provider and wherein such information can be used to update the table entries when the number scheme is modified. Furthermore, in countries utilizing a standardized length phone number scheme, such as in the United States where virtually all numbers are a standard seven digits long, the method can be adapted to take advantage of this situation by assuming a seven digit number for all but a few special sequences, which are listed in the table, such as 911 emergency calls and operator assisted calls, for example.

When dialing a long distance number or international number, a specific prefix is generally required to be entered to indicate a long distance call to the phone company's switch. In the United States, a caller is generally required to dial zero (or one for direct dialing) plus a three digit area code followed by a seven digit phone number in order to complete the call. Similarly, an international call is identified by the digits Oi l (009 in Sweden) entered plus the country code, city code followed by the phone number. In localized environments such as those operating within a PBX, internal phone numbers or extensions are typically four or five digits long. The look-up table can be configured to assume this standard length for extensions for this environment. To dial outside the PBX environment, the caller generally dials 9 or some other specified number to access an outside line followed by the phone number. The look-up table can also be configured to identify that an outside line was requested and accordingly determine the number of digits that will follow by analyzing the following prefixes (308).

In accordance with the embodiment, the table is contained in a memory in the transceiver station equipment and can be updated to add/remove or modify entries. In networks operating in accordance with Digital Advanced Mobile Phone System (D- AMPS) IS- 136, for example, data in the telephone set may be updated via wireless means thereby eliminating the need to manually update each phone. Such capability is included in the Over-the-Air-Teleservice (OATS) functions such as Short Message - 10 -

Service (SMS). The transceiver station (102) can be configured to update the look-up table (Fig. 3) by using the well known SMS function as a multi-point broadcast technique. In such an implementation, as known by those skilled in the art, the SMS message can be marked to indicate that a particular message contains information for the look-up table. This enables convenient mass updating without having to program individual stations. It should be noted that similar broadcast techniques are employed in other standards such as GSM and may be utilized in a similar manner.

The present invention contemplates a method of determining the number of digits dialed by the user prior to the conclusion of dialing. This permits the system to automatically initiate the call set-up procedure once last digit has been entered thereby eliminating additional user intervention. In a previously discussed embodiment, a connection with the switch is not required thereby not requiring the use of radio spectrum during dialing. Moreover, in the situation where a connection to the switch is made, the delay associated with call setup experienced in most radio based telecommunications is often reduced leading to a more consistent calling experience as compared with traditional wireline service.

It should be understood that the embodiment shown herein is merely exemplary and that one skilled in the art can make variations and modifications to the process steps without departing from the spirit and scope of the invention. In particular, the invention is applicable to mobile telecommunication systems such as cellular systems in addition to fixed wireless systems. Furthermore, mobile terminals may be substituted for the telephone set and transceiver stations as described in the invention for fixed wireless applications. Moreover, the invention is applicable to multi-line terminals, such as in a PBX environments, as well as in single-line terminal environments. All such variations and modifications are intended to be included within the scope of the invention as defined by the appended claims.

Claims

- 11 -WHAT IS CLAIMED IS:
1. In a fixed wireless network comprising a switching center, a base station, transceiver station, and at least one telephone set, a method of initiating a call setup procedure comprising the steps of:
detecting a condition when a caller takes said telephone set off-hook;
generating a simulated dial tone to be audible in the telephone set receiver in response to said detected off-hook condition;
receiving from the telephone set a series of digits entered by the caller representing a telephone number of a called party;
comparing a sequence of said entered digits to a predetermined stored list of sequences and their associated digit lengths in a look-up table;
identifying the digit length of the entered number prior to the conclusion of dialing based on said digit length associated with a sequence match found in said comparing step; and
initiating said call setup by sending the entered digits for processing to said switching center upon reception of the last digit entered, as determined by the digit length, and wherein when a match is not found, a "time-out" procedure is performed to determine the conclusion of dialing in order to initiate call setup to complete a connection to the called party.
2. A method according to claim 1 wherein said network is operating in accordance with the Digital Advanced Mobile Phone System (D-AMPS) standard.
3. A method according to claim 1 wherein said entered digits comprise Dual Tone
Multiplexed Frequency tones. - 12 -
4. A method according to claim 1 wherein said comparing step occurs within the telephone set.
5. A method according to claim 4 wherein said predetermined list of sequences is stored within a memory in the telephone set.
6. A method according to claim 1 wherein said predetermined list is updated by Short Message Service functionality.
7. A method according to claim 1 wherein processing by said switching center includes completing a connection to the called party.
8. A method according to claim 1 wherein said switching center functions as a private branch exchange.
9. A method according to claim 1 wherein in said initiating call setup step, when said match is not found, said "time-out" procedure is replaced by establishing a connection to the switch to complete the call.
10. A fixed wireless network, comprising:
a standard telephone set;
a transceiver station coupled to said telephone set;
at least one base station in two way wireless communication with said transceiver station;
a switching center coupled to said at least one base station;
means for detecting when said telephone set is taken off-hook;
means for determining when the last digit of a phone number is entered by a caller by comparing a sequence of the phone number to a predetermined stored list indicative of its length; and - 13 -
means for sending the entered the phone number to said switching center for processing.
11. A fixed wireless network according to claim 10 wherein said entered phone number is stored in a memory within the telephone set.
12. A fixed wireless network according to claim 10 wherein said sequence is the first three digits of the phone number entered.
13. A fixed wireless network according to claim 10 wherein said predetermined list is stored in a look-up table in a memory in said transceiver station.
14. A fixed wireless network according to claim 10 wherein said processing of said phone number includes means for completing a connection to the called party.
15. A fixed wireless network according to claim 10 wherein said switching center is a private branch exchange.
PCT/SE1999/000710 1998-04-30 1999-04-29 Method and apparatus for determining dialed number digit length in fixed wireless telecommunication networks WO1999057921A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US6979398 true 1998-04-30 1998-04-30
US09/069,793 1998-04-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000547798A JP2002514869A (en) 1998-04-30 1999-04-29 Determining method and apparatus digit length of the number dialed in fixed wireless communications networks

Publications (1)

Publication Number Publication Date
WO1999057921A1 true true WO1999057921A1 (en) 1999-11-11

Family

ID=22091246

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000710 WO1999057921A1 (en) 1998-04-30 1999-04-29 Method and apparatus for determining dialed number digit length in fixed wireless telecommunication networks

Country Status (2)

Country Link
JP (1) JP2002514869A (en)
WO (1) WO1999057921A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351871A (en) * 1999-03-09 2001-01-10 Siemens Inf & Comm Networks Dialling apparatus and process for Internet and Mobile Telephony
US6775538B2 (en) * 2000-08-24 2004-08-10 Airspan Networks, Inc. Handling of dialled digits in a wireless telecommunications system
US7020454B2 (en) 2001-06-14 2006-03-28 Lg Electronics Inc. Method for making communication in wireless local loop system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737975A (en) * 1984-09-18 1988-04-12 Metrofone, Inc. Programmable system for interfacing a standard telephone set with a radio transceiver
US4775997A (en) * 1984-09-18 1988-10-04 Metrofone, Inc. System for interfacing a standard telephone set with a radio transceiver
DE19706993A1 (en) * 1996-03-22 1997-09-25 Nokia Mobile Phones Ltd Terminal apparatus for wireless local loop

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737975A (en) * 1984-09-18 1988-04-12 Metrofone, Inc. Programmable system for interfacing a standard telephone set with a radio transceiver
US4775997A (en) * 1984-09-18 1988-10-04 Metrofone, Inc. System for interfacing a standard telephone set with a radio transceiver
DE19706993A1 (en) * 1996-03-22 1997-09-25 Nokia Mobile Phones Ltd Terminal apparatus for wireless local loop

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351871A (en) * 1999-03-09 2001-01-10 Siemens Inf & Comm Networks Dialling apparatus and process for Internet and Mobile Telephony
US6351526B1 (en) 1999-03-09 2002-02-26 Siemens Information And Communication Networks Inc. Dialing process for IP telephony
US6775538B2 (en) * 2000-08-24 2004-08-10 Airspan Networks, Inc. Handling of dialled digits in a wireless telecommunications system
US7020454B2 (en) 2001-06-14 2006-03-28 Lg Electronics Inc. Method for making communication in wireless local loop system

Also Published As

Publication number Publication date Type
JP2002514869A (en) 2002-05-21 application

Similar Documents

Publication Publication Date Title
US5913176A (en) System for virtual connection to dedicated PSTN lines
US7145998B1 (en) Systems, methods, and devices for a callback/callback reminder feature
US6332073B1 (en) Emergency number dialing from a fixed cellular terminal
US5627875A (en) Method in a telephone system for reaching a subscriber under busy/no answer conditions and ring/no answer conditions
US5995843A (en) Method and arrangement for using a mobile phone in a wireless office network
US4759016A (en) TDMA communication system having common local path medium and local time slot for intraoffice calls
US6240277B1 (en) Cellular phone with cancel function for fixed terminal dialing
US6044267A (en) Method for network operability of a multi-function cordless/cellular telephone
US6600925B1 (en) Process for integrating cordless telephone networks into cellular mobile telephone networks
US5864763A (en) Digital wireless telephone system interface for analog telecommunications equipment
US6154650A (en) System and method for delivering a call for a mobile station using either a wireless network or a wireline network
US5764730A (en) Radiotelephone having a plurality of subscriber identities and method for operating the same
US6871072B1 (en) Methods and apparatus for supporting optimum call routing in a cellular telecommunications system
US5509062A (en) Intelligent terminal based selective call forwarding
US6131025A (en) Method for providing ubiquitous service to mobile subscribers using a wireless gateway switch
US6195531B1 (en) Method and system for automatic configuration of fixed cellular terminals
US6035215A (en) Method and apparatus for providing cellular radio service to standard analog terminals
US20040240430A1 (en) IP gateway for hybrid circuit switched and IP based mobile wireless telephone system
US5781612A (en) Radio terminal interfaces for voice and data telecommunications, and methods for their operation
US20070270145A1 (en) Systems and Methods for Seamlessly Roaming Between a Wireless Wide Area Network and a Wireless Local Area Network
US5966660A (en) User controlled call setup through manual switchboard
US6021138A (en) Digital cordless telephone system for a private automatic branch exchange
US6032034A (en) Complete dialed number detection in WLL terminal without specified time delay
US6075985A (en) Wireless access system with DID and AIOD functions
US5771465A (en) Apparatus for providing a mobility adjunct for the public switched telephone network

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: PA/a/2000/010100

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 1020007012040

Country of ref document: KR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1020007012040

Country of ref document: KR

122 Ep: pct application non-entry in european phase
WWW Wipo information: withdrawn in national office

Ref document number: 1020007012040

Country of ref document: KR