Abstract:
A method for paging a high-speed subscriber by a roaming reservation in a radio paging switching system. The method includes the steps of registering a roaming area and a scheduled arrival time through a voice mail system; converting a format of the registered information and transmitting the registered information to the radio paging switching system; transmitting the registered information to a radio paging terminal so that the radio paging switching system can synchronize with the radio paging terminal in an area, a time and a frequency; and checking a timer of a corresponding area, and if a registered time elapses, storing, in a data base, information that a subscriber moves into the corresponding area, thus to provide the subscriber with a roaming service.

Description:
CLAIM OF PRIORITY 
     This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C §119 from an application entitled Method For Paging High-Speed Subscriber By Roaming Reservation In Radio Paging Switching System earlier filed in the Korean Industrial Property Office on Dec. 20, 1998, and there duly assigned Serial No. 97-71363 by that Office. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a method for paging a high-speed subscriber in a radio paging switching system, and more particularly, to a method for paging a high-speed subscriber by a roaming reservation. 
     2. Description of the Related Art 
     A radio paging switching system has provided paging subscribers with low-speed paging service using POCSAG-512 bps or POCSAG-1200 bps. Such a radio paging switching system can offer a wide area network radio paging service, a roaming service for example. The roaming service is a function for providing a communication service for a paging subscriber, or terminal subscriber, moving into an area belonging to another mobile communication system. For this, the mobile communication system which is requested to provide the communication service receives information about the terminal subscriber from a mobile communication system in which the terminal subscriber has originally been registered. 
     A public switched telephone network (PSTN) provides a telephone service for a caller who attempts to call a radio paging terminal by using a telephone. A radio paging switching system connected to the PSTN performs a paging service. A paging call processor judges whether a current call is a call for a low-speed subscriber or for a Flex™ (a paging protocol by Motorola which will be referred to hereafter as: flex) high-speed subscriber and processes a corresponding paging call. A base station interface controls a plurality of base stations and transmits radio paging data thereto. A wide area call processor receives a wide area call from the paging call processor to transmit a message and subscriber information to all registered areas, and receives a wide area call message from a wide area network to detect a radio frequency (RF) channel number. If there is a radio paging terminal corresponding to the detected RF channel number, the wide area call processor requests the paging call processor to process the wide area call. The low-speed base stations each transmit radio paging data to a plurality of low-speed transmitters, and control and monitor the transmitters. If a radio paging terminal roams into an area where it is not registered, it should sense its position. For example, if the radio paging terminal visits another area, it automatically senses its position by connecting an area recognition code using a reference frequency band of that area. Once the position is sensed, the radio paging terminal should inform the radio paging switching system of its position. To register the position of the radio paging terminal, the subscriber can register an area code by a direct connection with the paging call processor by a dual tone multifrequency (DTMF) signal using the telephone. If the subscriber roams to another area from a newly registered area, he should again register the roaming area. Therefore, it is inconvenient to register corresponding areas every time the subscriber roams. 
     Utilization of wireless terminals and the compensation for roaming are taught by the following U.S. patents: U.S. Pat. No. 5,039,984 to Andrew A. Andros et al. entitled Paging Receiver With Programmable Areas Of Reception; U.S. Pat. No. 5,561,703 to Cathy L. Arledge et al. entitled System And Method For Integration Of A Paging Server Into A Private Branch Exchange Environment; U.S. Pat. No. 5,600,312 to David F. Willard et al. entitled Message System And Method Having Roaming Capability And Controlled Group Messaging; U.S. Pat. No. 5,610,919 to David F. Willard et al. entitled Network Identification Information Placement Architecture For Messaging System Having Roaming Capability; U.S. Pat. No. 5,625,351 to David F. Willard et al. entitled Messaging System Having Roaming Capability; U.S. Pat. No. 5,745,481 to W. Garland Phillips et al. entitled Message System And Method For Efficient Multi-Frequency Roaming; and U.S. Pat. No. 5,787,345 to Billy G. Moon entitled Automatic Voice Prompts In A Land Mobile Radio System. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a method for paging a high-speed subscriber by previously registering roaming areas through a VMS in a radio paging switching system. 
     To achieve the above and other objects of the present invention, there is provided a method for paging a high-speed subscriber by a roaming reservation in a radio paging switching system having a voice mail system. The method includes the steps of: registering a roaming area and a scheduled arrival time through the voice mail system; converting a format of the registered information and transmitting the registered information to the radio paging switching system; transmitting the registered information to a radio paging terminal so that the radio paging switching system can synchronize with the radio paging terminal in an area, a time and a frequency; and checking a timer of a corresponding area, and if a registered time elapses, storing, in a data base, information that a subscriber moves into the corresponding area, thus to provide the subscriber with a roaming service. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete appreciation of the present invention, and many of the attendant advantages thereof, will become readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
     FIG. 1 is a block diagram of a switching network for a wide area network radio paging service; 
     FIG. 2 is a block diagram of a radio paging switching network according to the principles of the present invention; 
     FIG. 3 is a flow chart showing an operation process for registering a roaming area and time according to the principles of the present invention; 
     FIG. 4 shows a Telecator Network Paging Protocol format for synchronizing time and an area between a radio paging switching system and a radio paging terminal according to the principles of the present invention; 
     FIG. 5 shows an example of a sequential roaming area registration according to the principles of the present invention; 
     FIG. 6 shows a signal format of roaming registration information according to the principles of the present invention; 
     FIG. 7 shows an area ID management table for changing an area number into a Single Simulcast System Identification according to the principles of the present invention; and 
     FIG. 8 shows a frequency management table for managing a frequency value of an RF channel with respect to each area number according to the principles of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 shows a structure of a switching network for a wide area network radio paging service. A public switched telephone network (PSTN)  200  provides a telephone service for a caller who attempts to call a radio paging terminal by using a telephone  100 . A radio paging switching system  30  connected to the PSTN  200  performs a paging service. A PSTN interface  301  connected to the PSTN  200  receives an incoming call. A paging call processor  302  judges whether a current call is a call for a low-speed subscriber or for a flex high-speed subscriber and processes a corresponding paging call. A base station interface  303  controls a plurality of base stations  400  and transmits radio paging data thereto. An operation interface  304  is a module for managing and monitoring the radio paging switching system  30 . A wide area call processor  305  receives a wide area call from the paging call processor  302  to transmit a message and subscriber information to all registered areas, and receives a wide area call message from a wide area network to detect a radio frequency (RF) channel number. If there is a radio paging terminal corresponding to the detected RF channel number, the wide area call processor  305  requests the paging call processor  302  to process the wide area call. A voice mail system (VMS) interface  306  connected to the paging call processor  302  and the PSTN interface  301  transmits a voice signal received from a subscriber to a VMS  500 , and enables a voice announcement (prompt) or a voice message signal reproduced from the VMS  500  to be sent to a caller. The low-speed base stations  400  each transmit radio paging data to a plurality of low-speed transmitters  401 , and control and monitor the transm tters  401 . The VMS  500  provides a function menu according to a scenario given to a subscriber through the voice announcement, and provides a voice recording and reproducing service, a radio paging service, and a supplementary service such as a wide area select function. 
     If a radio paging terminal roams into an area where it is not registered, it should sense its position. For example, if the radio paging terminal visits another area, it automatically senses its position by connecting an area recognition code using a reference frequency band of that area. Once the position is sensed, the radio paging terminal should inform the radio paging switching system of its position. To register the position of the radio paging terminal, a wide area subscriber presses a radio paging number by using the telephone  100 . Then the subscriber is connected to the VMS  500  through the PSTN  200 . The VMS  500  sends a voice announcement to the subscriber. The subscriber presses a code of a roaming area according to the voice announcement. The area code is transmitted to the paging call processor  302  through the VMS interface  306  and stored in a data base. However, if the subscriber does not use the VMS  500 , he can register an area code by a direct connection with the paging call processor  302  by a dual tone multifrequency (DTMF) signal using the telephone  100 . 
     If the subscriber roams to another area from a newly registered area, he should again register the roaming area. Therefore, it is inconvenient to register corresponding areas every time the subscriber roams. 
     A radio paging switching network shown in FIG. 2 further includes, an HPCR (High Performance Paging Control Rack) interface  307 , an HPCR  600 , a high-speed base station  700 , and a plurality of high-speed transmitters  701 , in addition to the switching network shown in FIG.  1 . The HPCR interface  307  transmits to the HPCR  600  a call using a high-speed paging function out of calls processed in a radio paging switching system  300 . The HPCR interface  307  uses TNPP (Telecator Network Paging Protocol) Version 3.7 as protocol standard. Paging data includes a frequency number at which a radio paging terminal should be tuned, a CAP code, a function code, a page type, a page class, and a receiving message. The HPCR  600  codes paging data received through the TNPP to flex receiving protocol and transmits the coded data to the high-speed base station  700 . The high-speed base station  700  transmits the coded radio paging data to the high-speed transmitters  701 . The high-speed transmitters  701  page the radio paging terminal by the flex protocol. 
     A preferred embodiment of the present invention will be described hereinafter with reference to FIGS. 2 to  8 . 
     For a roaming service, high-speed subscribers should be registered. The operation interface  304  receives a CAP code of a high-speed subscriber, a frame number, a page collapse number, a phase number, and other general information and saves those in a hard disk and a memory of the radio paging switching system  300 . The frame number is stored in a buffer D_Pval (not shown). The collapse number and the phase number are stored in a buffer D_QRval (not shown). Low-speed subscribers can also be registered. In this case, only a CAP code and other general information are saved. 
     If such information is registered, a wide area class is assigned to a specific flex subscriber through the operation interface  304  and the flex subscriber can use the VMS  500 . 
     Referring to FIG. 3, there is shown an operation process for registering a roaming area and time. If a subscriber (user of a radio paging terminal) calls the radio paging switching system  300  by using the telephone  100  in order to reserve a roaming service, the PSTN interface  301  senses this and connects a call to the VMS  500  through the VMS interface  306 . The VMS  500  sends a voice message indicating that a call has been connected and sends a voice message directing the subscriber to select a service menu at step  101 . If the subscriber selects a roaming service menu, the VMS  500  sends a voice message directing the subscriber to select a roaming area number at step  102 . If the subscriber selects a roaming area number, the VMS  500  sends a voice message directing the subscriber to register a scheduled arrival time at step  103 . If the subscriber selects a scheduled arrival date, hour and minute (DDHHMM), the VMS  500  sends a voice message directing the subscriber to register a scheduled departure time from a roaming area at step  104 . If it is registered, the VMS  500  sends a voice message that a roaming service will be provided for the subscriber from DDHHMM to DDHHMM in a specific area, at step  105 . The VMS  500  checks at step  106  whether another area is selected by sending a voice message to ask the subscriber whether he will select another area. If another area is selected, the above operations are repeated. Various areas may be sequentially registered in order of time, for example (a)→(b)→(c)→(d)→(e)→(a), as shown in FIG.  5 . If another area is not selected at step  106 , the operation process is ended. 
     If the roaming area and time are registered, the VMS  500  converts the registered information into a signal format shown in FIG.  6  and transmits the registered information to the paging call processor  302  through the VMS interface  306 . The paging call processor  302  stores information regarding the subscriber who has registered the roaming area and time as a wide area registration subscriber in the data base, and transmits the roaming area and time to the HPCR interface  307  by the signal format shown in FIG. 6 in order to synchronize with the radio paging terminal in time. The HPCR interface  307  packing-processes the received information into the TNPP signal format shown in FIG.  4  and transmits the processed information to the HPCR  600 . In FIG. 4, information about a SSID (Single Simulcast System Identification) and a frequency are obtained from an area ID management table shown in FIG. 7 and a frequency value management table shown in FIG. 8, respectively. These tables are managed by the operation interface  304  and may be altered. If the HPCR  600  transmits the registered information to the radio paging terminal through the high-speed base station  700 , the radio paging terminal stores the received information in a memory. In order to monitor the time of each of sequentially registered areas, a timer of the radio paging terminal starts to operate to synchronize time for a roaming area between the radio paging switching system  300  and the radio paging terminal. If the time for each roaming area indicates a registered time, the radio paging terminal is tuned at a frequency of a corresponding area shown in FIG.  4  and becomes a ready state for a wide area call. Similarly, a timer of the radio paging switching system  300  operates. If the time for each roaming area indicates the registered time, the radio paging switching system  300  stores information that the subscriber moves into a corresponding area in the data base. An overlap time is applied to the subscriber in areas to depart and to visit, thereby providing a roaming service during a time gap. For roaming processing, a wide area call processing signal is transmitted to, for example, a radio paging switching system B from the radio paging switching system  300 . 
     As described above, since the roaming area is previously registered through the VMS, the roaming service can be provided in a corresponding area. If various roaming areas are sequentially registered in advance, the sequential roaming services for those areas are offered. 
     While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.