WO1993009629A1 - Procede et appareil servant a reserver une voie de communication dans un systeme de communication a telepoints - Google Patents

Procede et appareil servant a reserver une voie de communication dans un systeme de communication a telepoints Download PDF

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Publication number
WO1993009629A1
WO1993009629A1 PCT/US1992/008250 US9208250W WO9309629A1 WO 1993009629 A1 WO1993009629 A1 WO 1993009629A1 US 9208250 W US9208250 W US 9208250W WO 9309629 A1 WO9309629 A1 WO 9309629A1
Authority
WO
WIPO (PCT)
Prior art keywords
base unit
wireline
handset
channel
pstn
Prior art date
Application number
PCT/US1992/008250
Other languages
English (en)
Inventor
Robert W. Furtaw
Richard A. Comroe
Original Assignee
Motorola, Inc.
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
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1993009629A1 publication Critical patent/WO1993009629A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Definitions

  • This i nvention relates generally to telepoint 10 communication systems, and more particularly to a method of reserving a communication path in a such a system.
  • FIG. 1 are well known in the art.
  • the base unit 102 terminates a phone line 104 with an associated public switched telephone network (PSTN, 106) access number. When calls are placed to this telephone number, the base unit 102 signals the handset
  • PSTN public switched telephone network
  • the handset 101 then relays the call via an RF channel of a predetermined frequency.
  • the handset 101 may initiate a call by signalling to the base unit, on the same RF channel, and the communication is relayed in the other direction.
  • This type of two-way communication using a single RF channel and an
  • So-called telepoint communications systems employ strategically placed base units to provide one-way telecommunications coverage to locations of high pedestrian traffic, such as railway stations, airports, and other public
  • Each base unit communicates with, but is not paired directly with any one of, a plurality of telepoint handsets.
  • the telepoint handsets may initiate, but not receive, a call whenever
  • each base unit terminates a plurality of phone lines, where each phone line may be associated with a specific phone number.
  • each individual pay phone instrument is typically marked with and identified by its associated telephone number.
  • a user can make note of its telephone number, relay the telephone number to a called party, and after his call is terminated, receive a return call through the same pay phone.
  • a user may initiate calls without even seeing the base unit. Further, even if the user knew the phone number of the wireline for a given call, the user would have no way of reserving the wireline for a return call.
  • another telepoint user could initiate a call on the previously used wireline, without the knowledge of the waiting user.
  • the present invention encompasses a method of selectively changing the service state of a communication path in a telepoint communications system.
  • the telepoint system includes a base unit and at least one handset.
  • the base unit is coupled to a public switched telephone network (PSTN) via at least one wireline, and is able to communicate with the handsets via at least one radio frequency (RF) channel.
  • PSTN public switched telephone network
  • RF radio frequency
  • Each wireline is associated with, and coupled to, one of the RF channels.
  • the method includes the step of, at the " handset, receiving a PSTN access number from the base unit.
  • the handset might then signal, to the base unit, a service request to change the service state for the PSTN wireline associated with the PSTN access number.
  • the base unit might, after receiving the request signal from the handset, alter the service state of the PSTN wireline.
  • FIG. 1 shows a cordless phone handset and paired base unit which is known in the art.
  • FIG. 2 shows cordless phone system including several handsets and a multi-line base unit, which system may employ the present invention.
  • FIG. 3 shows a timing diagram illustrating communication signals which may be exchanged between a handset and a base unit, in accordance with the present invention.
  • FIG. 4 shows a cordless phone handset, in accordance with one embodiment of the present invention.
  • FIG. 5 shows a portion of a base unit memory device, which may include information for carrying out the present invention.
  • FIG. 6A shows a flow diagram depicting the handset operation, in accordance with one embodiment of the present invention.
  • FIG. 6B shows a flow diagram depicting the line-reserve operation, in accordance with the present invention.
  • FIG. 7 shows a flow diagram depiction the base unit operation, in accordance with the present invention.
  • FIG. 8A shows a simplified block diagram of a base unit, in accordance with the present invention.
  • FIG. 8B shows a simplified block diagram of a handset, in accordance with the present invention.
  • FIG. 2 illustrates a simplified graphical representation of a telepoint communications system 200.
  • the system 200 includes base unit 201 and cordless handsets 210-220.
  • the handsets 210-220 may be identical to the handset (101 ) shown in FIG. 1.
  • Each of these handsets 210-220 may have private base units e.g., base unit 102, located elsewhere. When they are away from the coverage area of their private base unit 102, they may initiate calls through a public base unit 201 , via any of the phone lines 202-208 terminating at the base unit 201 , which phone lines, or wirelines, are further coupled to PSTN 206.
  • the base unit 201 may serve any cordless handsets (within its coverage area) wishing to initiate calls, up to the limit of the number of attached phone lines 202-208 on a first- come first-serve basis. While four wirelines 202-208 are shown, the public base unit 201 may terminate any number of phone lines. In the preferred embodiment, the contemplated base unit 201 can terminate any number from one to the maximum number of allowable radio frequency (RF) channels presently available for cordless phone use. Accommodating such a number of channels typically, involves including circuitry within the base unit 201 for each wireline- RF channel pair. Though the present invention is described using RF channels, it is anticipated that any type of communication schemes may be employed, including TDM, FDM, etc.
  • RF radio frequency
  • the base unit 201 makes its presence known to the handsets 210-220 within its coverage area, by periodically transmitting signals (e.g. signals 402-408 in FIG. 3, later described) on each RF channel assigned for that system.
  • the signal on each RF channel includes the PSTN access number (or simply that portion which distinguishes it from the other wirelines for that system) of the associated wireline / RF channel pair.
  • signal 400 shown in FIG.3 would be transmitted on each of the four RF channels from the base unit 201 , each channel identifying the phone number for its associated wireline 202-208.
  • the handsets 210-220 locate a base unit by scanning for these periodically transmitted signals 402-408 on base transmit channels, the particular frequency of which are preferably known by the handset, but which might be identified by scanning an entire frequency range. Upon finding a channel with these signals, the handset remains on that channel for as long as these signals remain present. Also, the handset temporarily saves the phone number contained within these messages.
  • FIG. 4 illustrates a cordless phone handset 300 which may employ the invention.
  • the handset includes a speaker 302 and microphone 310, keypad 308, display 304, and function keys 306.
  • one of the function keys 306 is provided to display the PSTN access number, while another is provided to select/de-seiect the line-reserve feature, as later described.
  • Typical handset signals 412 are shown in FIG. 3, which signals convey control and voice data to the handset.
  • Keypad 308 may be used to enter the digits of the desired phone number, which digits are also echoed on display 304 for the operator's feedback .
  • the user When the user wants to know the phone number of the line being used by the ' base unit (during a call), the user depresses an appropriate function key 306. This causes the associated phone number of the phone line being utilized to be displayed on the handset display 304. (This number was received from the messages 402-408 transmitted by the base unit 201 , and which were received by the handset prior to the call initiation. The user may then announce the number to the called party.)
  • an appropriate function key is activated on the handset 306.
  • a keystroke causes a different set of signals to be transmitted to the base unit 201 , which instructs., the base unit 201 to terminate the call, but continue transmitting on the channel 414.
  • Line-reservation by the base unit 201 may remain active as long as the handset continues transmitting a reservation signal such as that shown in FIG. 3 (416). This may continue until one of several conditions occur.
  • the user may explicitly cancel the line-reserve feature (hereafter "reservation") by activating an appropriate one of the function keys 306 on the handset 304.
  • FIG. 5 represents a portion of a memory device coupled to a microprocessor in the base unit, which components are later described, for a telepoint communications system having 100 wirelines and associated RF channels.
  • the wireline identification (ID) is shown in field 502.
  • Field 504 contains the RF channel frequency information (which may be represented by 25 kHz increments from a predetermined base frequency for that telepoint system, as shown).
  • Field 508 contains the wireline status code in effect for the wireline identified in the accompanying memory location of field 502. These codes may be, for example, "B M to represent a busy condition; "R” to represent a reserved condition; and "I" to represent an idle condition.
  • the wireline having ID number 001 is in a "reserved” state, while the wireline having ID number 100 is in a "busy” state.
  • the format of the status codes are not important; it is only important that they somehow distinguish between a busy, idle, or reserved wireline
  • FIG. 6A shows a simplified flow diagram 600 which depicts the handset operation for the telepoint system in accordance of one embodiment of the present invention.
  • the operation begins when the handset scans (601) for an available channel. This operation may include a discrete frequency scan from a list of predetermined frequencies stored in the handset, or a spectral scan within a range of potential available frequencies for that telepoint system. The scan operation continues until an identified channel becomes available (603). Once a channel becomes available, the handset receives and saves (605) the PSTN access number for the wireline associated with the particular channel (e.g., automatically). The PSTN access number (P.A.N.) is sent in the outbound words for that RF channel, as later described.
  • P.A.N. The PSTN access number
  • the handset then remains idle (607) until an outbound call is initiated by the handset operator. Once a call is initiated, the handset then displays (609) the saved PSTN access number and transmits the call in accordance with the signalling shown in FIG. 3. The handset then continues, in known fashion, until a call disconnect is detected (611), or the line-reserve feature is selected (617). If neither a call disconnect is detected (611), or the line-reserve function selected (617), transmission signalling continues, while displaying (609) the PSTN access number, as shown. Upon detection (611) of a call disconnect, the call is terminated (613) and the routine is exited (615).
  • the handset transmits (621) a reservation signal and continues to monitor the RF channel. Though not described in detail below, the base unit responds to this request by changing the status of the wireline from busy ("B") to reserved ("R"). Once the channel is lost (623), the routine is exited (615). (Note: “lost” is defined, in a preferred embodiment, as a condition where the received signal strength (RSS) falls below a predetermined threshold for a predetermined amount of time, or some other unexpected failure of the system, or its related components). While the channel is still available, the handset looks for the line-reserve to be de ⁇ selected (625), e.g. invoked by a second function key on the handset.
  • RSS received signal strength
  • the handset transmits a terminate reservation signal (629) before exiting the routine (615). Until the line-reserve feature is de ⁇ selected (625) the handset looks for an incoming call until one is detected (627). If an incoming call is not detected, the handset continues to transmit the reservation signal and monitor the assigned RF channel (621). Once an incoming call is detected, the handset rings (631), and the operator is given the option of answering the telephone (633). A ring timer is then initiated, which timer is set to a predetermined amount of time to prevent prolonged ringing of the handset. During this time, the handset continues to ring. (631), or in the alternative, the call may be transferred, e.g., to another predetermined wireline or handset. Once the handset is answered, or the timer expires, the handset is engaged in the call by transmitting the appropriate signals to the base unit (609), and continues in the same manner as if the call was initiated by the handset operator.
  • FIG. 7 shows a simplified flow diagram (700) depicting the base unit operation corresponding to a specific radio frequency (RF) channel, and its associated PSTN wireline. It is assumed that the logic flow described herein with respect to one RF channel is substantially replicated for each RF channel in the system.
  • the routine begins, initially, with the channel status of the associated wireline (e.g., from data base 500) being in the "idle" state.
  • the base unit men scans (702) its corresponding RF channel frequency for a handset transmission. During this scanning period, the base unit transmits messages (e.g., periodically) identifying the channel state as being idle, and containing the associated, PSTN access number (PAN) of the corresponding wireline.
  • the PAN is determined by accessing the database 500 (i.e., field 504 in FIG.
  • the base unit determines (708) whether or not the associated wireline is available. This is accomplished by retrieving a portion of the data base 500 shown in FIG. 5 (field 508 containing the status code of the associated wireline). If the wireline is not available (i.e., field 508 has a status code other than "I"), the base unit issues (710) a busy signal on the channel attempting to make the call. If the wireline is available, the base unit updates (712) the billing file, which may be held in a data base separate from data base 500. The base unit then updates (716) the wireline status code to a busy state ("B"), such as that entered in field 508 for wireline ID number 002, shown in FIG. 5.
  • B busy state
  • the call is then patched (718), i.e., a connection is made between the RF section of the base unit and the PSTN wireline by the base unit, via a PSTN interface, as later described.
  • the call continues until a disconnect or reservation-end signal has been received (720).
  • the base unit Upon receipt of a disconnect or reservation-end signal, the base unit updates the status code for the wireline, as appropriate (i.e., alters the state from "R" to "I” if reservation-end is received, or if handset goes out of range).
  • the base unit then terminates the current call (722) and the routine is exited (726).
  • the base unit looks for a handset call (704), if no handset call is received, the base unit then checks for an call from the PSTN (706). If the received signal does not indicate an PSTN call, the base unit continues to scan the RF channel (702). If a PSTN call is detected, i.e., the associated wireline receives a call-ringing signal, the base unit determines whether or not that particular wireline has been reserved (714) by any of the handsets in the system. That is, the base unit retrieves the status code (field 508) for the particular wireline holding the PSTN call, and looks for a status code of "R".
  • the wireline status is updated (716) to a busy state, ("B") just as in the case of the handset call. From this point, the call is processed in an identical manner as in the case of the outbound call. If the wireline has not been reserved, i.e., status code is "I” or "B", then the base unit ignores the ringing signal on the wireline (724), and the routine is exited (726).
  • FIG. 8A shows a simplified block diagram of a base unit 800 which may be used to employ the present invention.
  • the base unit 800 includes an antenna 801 for transmitting/receiving communication signals to/from the handset, which handset is later described.
  • the base unit 800 further includes transmit circuitry 803, receive circuitry 805, memory device 807, and digital processor 811.
  • the base unit 800 might include a PSTN interface to couple the RF section (803, 805) to PSTN wirelines 813.
  • FIG. 8B shows a simplified block diagram of a handset 850 which may employ the present invention.
  • the handset includes an antenna 815 for transmitting/receiving communication signals to/from the base unit 800.
  • each handset includes transmit circuitry 817, receive circuitry 819, memory device 825, keypad 829, display device 831 , and digital processor 827.
  • the handset includes a microphone 821 , and a speaker 823.
  • the receive circuitry 819 Upon switching on the handset 850, the receive circuitry 819, in concert with antenna 815, attempt to acquire an RF channel which is available for communication. If an RF channel is not available within a predetermined time, or there are no available wirelines, the handset might, for example, emit a busy tone. If a channel is available, the handset might, for example, illuminate an indicator light to show the operator that the phone is ready for use.
  • the call may be initiated by pressing a sequence of keys on keypad 829, which sequence is processed in processor 827.
  • a telephone number may be retrieved from memory device 825, and processed in a similar manner.
  • the transmit circuitry 817 transmits the appropriate signals via antenna 815, which signals are received by the antenna 801 of the base unit 800.
  • the receiver circuitry 805 of the base unit 800 then demodulates the transmitted information and presents it to the PSTN interface 809. If these are voice signals, the signals are simply passed on to the appropriate PSTN wireline 813 associated with the RF channel transmitting the data. If the information includes a line-reservation signal, telephone number, or other predetermined feature sequence, the processor 811 processes the information, and may use memory 807 to do so.
  • the response communication signals from the landline telephone are then transmitted via the wireline 813, passed on through the PSTN interface 809, and transmitted via transmit circuitry 803 and antenna 801.
  • the signals are then received at the handset 850 using antenna 815 and receive circuitry 819.
  • the signals are then passed on to the speaker 823 which emits the voice of the landline party.
  • data base 500 shown in FIG. 5 may be stored in memory device 807 of the base unit 800.
  • line-reserve (e.g., select and de ⁇ select) function keys would be included on the keypad 829 of the base unit 850.
  • the PSTN access number could be displayed using display device 831 on the handset 850.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un système de communication à télépoints (200) utilise un procédé (621-633) de modification sélective de l'état de service d'une voie de communication. Le système à télépoints (200) comprend une unité de base (201) et au moins un combiné (210). L'unité de base (201) est couplée à un réseau téléphonique public commuté (PSTN, 206) par l'intermédiaire d'au moins un câble (202), et peut communiquer avec les combinés (210-220) par l'intermédiaire d'au moins un canal de radiofréquence (RF). Le procédé comprend l'étape de réception (605), au niveau du combiné (210), d'un numéro d'accès au réseau public commuté à partir de l'unité de base (201). Le combiné (210) peut ensuite émettre un signal (617) à l'unité de base (201), pour demander (416) un changement de l'état de service relatif au câble PSTN associé au numéro d'accès de PSTN. L'unité de base (201) peut, après avoir reçu le signal de demande, modifier l'état de service (508) relatif au câble PSTN.
PCT/US1992/008250 1991-11-04 1992-09-30 Procede et appareil servant a reserver une voie de communication dans un systeme de communication a telepoints WO1993009629A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78748791A 1991-11-04 1991-11-04
US787,487 1991-11-04

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WO1993009629A1 true WO1993009629A1 (fr) 1993-05-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020864A1 (fr) * 1994-01-28 1995-08-03 Telia Ab Amenagement d'un systeme de telecommunications
FR2801156A1 (fr) * 1999-11-17 2001-05-18 Design Associates Systeme de telephonie public et procede correspondant d'acces au reseau telephonique commute borne fixe et terminal de radiocommunication compris dans un tel systeme

Citations (7)

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Publication number Priority date Publication date Assignee Title
US4166927A (en) * 1978-07-21 1979-09-04 British Columbia Telephone Company Apparatus and method for frequency channel selection in a radiotelephone system
US4266098A (en) * 1978-11-03 1981-05-05 Novak Albert P Device to automatically screen incoming telephone calls, determine the identity of the caller and process the call accordingly
US4658416A (en) * 1984-02-14 1987-04-14 Nec Corporation Automatic call transfer system capable of carrying out call transfer without manual operation
US4890315A (en) * 1987-03-20 1989-12-26 Orion Industries, Inc. Cellular remote station with multiple coupled units
US5090051A (en) * 1990-02-22 1992-02-18 Motorola, Inc. Radio communication system and method for connecting an incoming call to a wireless telephone
US5101451A (en) * 1988-12-29 1992-03-31 At&T Bell Laboratories Real-time network routing
US5155759A (en) * 1988-07-15 1992-10-13 Nec Corporation Control method for cordless telephone which displays identities of responding called parties

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166927A (en) * 1978-07-21 1979-09-04 British Columbia Telephone Company Apparatus and method for frequency channel selection in a radiotelephone system
US4266098A (en) * 1978-11-03 1981-05-05 Novak Albert P Device to automatically screen incoming telephone calls, determine the identity of the caller and process the call accordingly
US4658416A (en) * 1984-02-14 1987-04-14 Nec Corporation Automatic call transfer system capable of carrying out call transfer without manual operation
US4890315A (en) * 1987-03-20 1989-12-26 Orion Industries, Inc. Cellular remote station with multiple coupled units
US5155759A (en) * 1988-07-15 1992-10-13 Nec Corporation Control method for cordless telephone which displays identities of responding called parties
US5101451A (en) * 1988-12-29 1992-03-31 At&T Bell Laboratories Real-time network routing
US5090051A (en) * 1990-02-22 1992-02-18 Motorola, Inc. Radio communication system and method for connecting an incoming call to a wireless telephone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020864A1 (fr) * 1994-01-28 1995-08-03 Telia Ab Amenagement d'un systeme de telecommunications
FR2801156A1 (fr) * 1999-11-17 2001-05-18 Design Associates Systeme de telephonie public et procede correspondant d'acces au reseau telephonique commute borne fixe et terminal de radiocommunication compris dans un tel systeme

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