AU744532B2

AU744532B2 - Cordless telephone system

Info

Publication number: AU744532B2
Application number: AU43663/97A
Authority: AU
Inventors: Kazuyoshi Hijii
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1996-10-31
Filing date: 1997-10-31
Publication date: 2002-02-28
Anticipated expiration: 2017-10-31
Also published as: AU4366397A; SG64458A1; GB9723080D0; JP2907155B2; JPH10136095A; GB2318951A; CN1169386C; GB2318951B; CN1187097A

Description

f- S F Ref: 398790

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

Name and Address of Applicant: 00 0 NEC Corporation 7-1, Shiba Minato-ku Tokyo

JAPAN

Kazuyoshi Hijii Actual Inventor(s): Address for Service: Invention Title: Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Cordless Telephone System 0.

The foylowing statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 1 Cordless Telephone System BACKGROUND OF THE INVENTION i. Field of the Invention The present invention relates to a telephone system that responds to a ring for a call received across an analog cable and to a signal that carries the telephone number of a caller, and in particular to a cordless telephone system that has a function for storing received data and for transferring data to a terminal registered with the tele- ~phone system.

2. Descriptionof the prior Arts Conventionally, when a telephone system connected to a cable receives CLI (Caller Line Identification) data, i.e., ee data for the telephone number of a caller, methods are employed whereby the telephone number of the caller is displayed on a display device Japanese Unexamined *Patent Publication No. Hei 4-304756), or whereby data is transmitted to a remote handset terminal of a telephone 20 system and displayed.

For a cellular telephone, when its power is off, the system can store CLI data, which can be retrieved from the system, as needed.

In a conventional, second-generation cordless home telephone system, where the main terminal is connected to a 2 cable and the main terminal and a plurality of remote handset terminals are connected by radio, when the remote handset terminals are within an area within transmission range of the main telephone terminal for home use, they receive data from the main terminal and are set to the wait state, but do not perform position registration. In a situation where there are no registered remote handset terminals within transmission range or where all of them are powered off, when CLI data is received by the main telephone terminal, since in the area there are no remote handset terminals that can respond, the received CLI data are merely stored in a storage circuit and are displayed on the display device of the main telephone terminal. The data that are stored will not be transferred to a remote handset terminal later, even when it is powered on or is relocated from a remote location and is again within transmission range.

In a case where a remote handset terminal that is the target for the reception of a selective call is out of ooooo range, a main telephone terminal for home use will notify 20 all other remote handset terminals of the call and wait for their responses. Upon the receipt of the responses from the remote handset terminals, a communication state is established, and the CLI data that are received are erased without being reported to the remote handset terminal that was the target of the selective call. This operation is also -3performed also for a conference call. Once one of the remote handset terminals is set in the communication state, CLI data are erased, even though there are other remote handset terminals that did not receive the CLI data.

Second-generation cordless telephones (PHSs: Personal Handy Phone Systems) have individual telephone numbers for use in public areas, and can receive CLI data individually. However, since for an area in and adjacent to a home a plurality of remote handset terminals share one telephone number, CLI data is not transmitted to a remote handset terminal that is not within transmission range when a call is received.

A need therefore exists to provide a telephone system that stores CLI data, and that so manages remote handset terminals that once a remote handset terminal that was not active in the vicinity of a home when the CLI data was received is again within transmission range and requests position registration, the telephone system notifies the remote handset terminal of the receipt of the call and transfers the CLI data that was 0 received.

SUMMARY OF THE INVENTION According to an aspect of the present invention, there is provided a cordless telephone system including a main terminal connected to a cable and one or more remote cordless terminals communicating with the main terminal, the main terminal including: 20 means for receiving caller line identification (CLI) data for a call received over said cable; position registration or polling means for detecting when a cordless terminal is active; means for transmitting the CLI data to all active cordless terminals; and means for automatically transmitting the CLI data to any further cordless terminals which become active at a later time.

According to an embodiment of the present invention, when a home use main terminal for a second-generation cordless telephone receives a call and CLI data across an [R:\LIBQ]706.doc:eaa S-4analog line while a remote handset terminal is powered off or is outside the range of the home use main telephone terminal, the main terminal for home use stores the CLI data in its own memory, and transmits the CLI data to the remote handset terminal when the remote handset terminal is again active within range of the home use main terminal and requests position registration.

According to a further embodiment of the present invention, a second-generation cordless telephone system, with which a plurality of remote handset terminals are registered, stores CLI data in its own memory upon receipt of a call and holds the CLI data while the registered remote handset terminals are not available. When a remote io handset terminal that previously was not available is again active within fange of the main terminal and requests position registration, the main terminal notifies the remote handset terminal of the receipt of the call and transmits the CLI data to the remote handset terminal and a call that was received while the remote handset terminal was not available.

The remote handset terminal, after receiving the CLI data, displays the CLI data using a I 15 display circuit. In this fashion, when an alarm sound is generated in conjunction with the display of the CLI data, a call that was received while the remote handset terminal was not available can be easily identified.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is schematic diagram illustrating a home use ooo• i

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,1&)BQ]76.docen i 5 system for a cordless telephone system according to the present invention; Fig. 2 is a block diagram illustrating the arrangement of the main terminal of the cordless telephone system according to the present invention; Fig. 3 is a block diagram illustrating the arrangement of a remote handset terminal of the cordless telephone system according to the preset invention; Fig. 4 is a block diagram illustrating an example circuit arrangement of a controller in the remote handset terminal shown in Fig. 3; Fig. 5 is a flowchart for explaining the CLI data storage processing performed by the main terminal of the cordless telephone system of the present invention; Fig. 6A is a diagram showing a format for a call signal; Fig. 6B is a diagram showing an example ringer signal; Fig. 7 is a diagram showing a format for a conference e call signal; 20 Figs. 8A and 8B are tables showing a change in a CLI flag corresponding to CLI data; Fig. 9A is a diagram showing a format for storing CLI data; Fig. 9B is a diagram showing a specific example of CLI data; 6 Fig. 10 is a diagram showing terminal flags corresponding to CLI data; and Fig. 11 is a flowchart of the processing performed when the home use main terminal transmits data to a remote handset terminal.

DETAILED DESCRIPTION OF THE PREFERRED

EMBODIMENT

The preferred embodiment of the present invention will now be described in detail by reference to the accompanying drawings.

In Fig. 1, remote handset terminals A, B and C are registered in a second-generation cordless telephone system connected to an analog telephone line 10, a home use main terminal 11 of a personal handy phone system (PHS).

Fig. 2 is a block diagram illustrating the configuration of the home use main terminal shown in Fig. i.

In Fig. 2, the home use main terminal 11 comprises: a communication unit 21, which acts as an interface with the analog telephone line 10; a CLI receiver 24, for receiving o ndata concerning the telephone number of a caller (CLI) that 20 is output by a switch (not shown) along the analog telephone *""line 10; a controller 22, for controlling the home use main terminal 11; a radio communication circuit 23, for exchanging data with the remote handset terminals A, B and C; and a memory 25, which is used for storing CLI data.

The communication unit 21 includes a communication 7 circuit 21a, an ADPCM 21b and a ringer detector 21c. The controller 22 includes a CPU 22a and an MPC 22b. The CLI receiver 24 includes a CLI modem circuit 24a and a serialparallel converter 24b. The memory 25 includes a ROM a RAM 25b and a EEPROM When a first ringer signal is transmitted over the analog telephone line 10 and is detected by the ringer detector 21c, the action is reported to the CPU 22a via the MPC 22b. The CPU 22a enters a wait state and waits to receive CLI data and a second ringer signal. When the CLI modem circuit 24a receives the CLI data, it outputs the data serially in 8-bit groups. The serially output data are converted into 8-bit parallel data groups by the serialparallel converter 24b. The CPU 22a reads the parallel data in consonance with the timing of an interrupt signal INT that is output by the CLI modem circuit 24a. The CPU 22a extracts only the telephone number of a caller from the CLI data, and prepares and stores data that are to be transmitted to the remote handset terminals A to C. The home use main terminal 11 then transmits to the remote handset

S*

S* terminals A to C, the prepared data, together with a call signal, and displays CLI data on an LCD.

When one of the remote handset terminals responds to the call, the main terminal 11 opens the communication circuit 21a to ensure the establishment of a communication 8 state, and exchanges the data with the remote handset terminal that responded. When the home use main terminal 11 begins communication with the remote handset terminal, the main terminal 11 stores the received CLI data and a flag for the remote handset terminal in the RAM 25b. From among the flags for the remote handset terminals stored in the RAM the flag of a remote handset terminal that has responded to the call and the flags of remote handset terminals for which position registration has been performed are cleared. When all the flags are cleared, the CLI data stored in the RAM are cleared.

Fig. 3 is a block diagram illustrating the arrangement of the remote handset terminal A shown in Fig i.

In Fig. 3, the remote handset terminal A comprises: a radio communication circuit for exchanging data with the °o home use main terminal 11; a key matrix 32 having number keys and a transmission key; a controller 33 for exercising ~various types of controls for the remote handset terminal A; a display circuit 34 for displaying the telephone number of 20 a caller; an acoustic circuit 35 for changing from voice to *a voice signal or vice versa; a microphone 36; and a loudspeaker 37.

As is shown in Fig. 4, the controller 33 includes a CPU 33a, a custom LSI 33b, a EEPROM 33c, a flash ROM 33d and a RAM 33e. The custom LSI 33b has channel codec, ADPCM codec, 9 radio control and timer functions, and a function for monitoring various conditions.

When the remote handset terminal A is relocated to the transmission range of the home use main terminal 11 from a remote location, or when the remote handset terminal A is powered on in the area, the remote handset terminal A detects control data from the main terminal 11. When the remote handset terminal A detects desired data broadcast by the main terminal 11, it requests position registration relative to the main terminal 11. When the main terminal 11 receives the position registration request from the remote handset terminal A, the main terminal 11 employs the terminal number corresponding to the remote handset terminal A to determine whether or not there are pertinent CLI data oooo available in the data stored in the storage circuit. When pertinent CLI data are available, the main terminal transmits the CLI data to the remote handset terminal A, and ~thereafter clears the CLI data flag for the remote handset ooeoo terminal A.

000.I 20 When the flags of all the remote handset terminals have been cleared, the main terminal 11 erases the CLI data. The remote handset terminal A displays the received CLI data by using the display circuit 34. And at this time, the acoustic circuit 35 may generate an audible alarm through the loudspeaker 37 to notify a user that CLI data are being 10 displayed.

The remote handset terminals B and C have the same structure as does the terminal A.

The processing performed by the home use main terminal 11 when storing CLI data will now be explained while referring to the flowchart in Fig. Before this processing is explained, an explanation will be given for a call signal, which includes CLI data, that the home use main terminal 11 receives across the analog telephone line 10, and for a conference call signal nthat is transmitted from the main terminal 11 to a remote handset terminal.

Fig. 6A is a diagram showing a format for a call signal. The call signal is formed by arranging a first ooo ringer signal, CLI data, a second ringer signal, a third 0* ringer signal, etc., in the named order. As is shown in Fig. 6B, the ringer signal has a repetitious pattern according to which a signal of 16 Hz is continued for one ooooo S"second after polarity is inverted, is halted for two 20 seconds, and then is again continued for one second.

00 00 Fig. 7 is a diagram showing an example format for a conference call signal. This format is known in Japan as RCR Standard28.

Referring to the flowchart in Fig. 5, When the home use main terminal 11 of the second-generation cordless telephone 11 system receives a call signal that includes CLI data (steps S101 and S102), the main terminal 11 transmits a conference call signal to the remote handset terminals A, B and C (step S103). Then, before it receives the responses from the remote handset terminals, the main terminal 11 stores the CLI data in the memory 25 (step S104) and sets the flag of a registered remote handset terminal (step S105). In a case as shown in Fig. i, where three remote handset terminals are registered in the main terminal 11, and assuming that the received CLI data is CLI data i, as is shown in Fig. 8A CLI flags 1 (the flag of the terminal corresponding to CLI data 1) for the first remote handset terminal A, the second remote handset terminal B and the third remote handset terminal C are set to These flats are stored, for ooeo example, in the memory When one of the remote handset terminals responds to the call signal (YES at step S106), the main terminal 11 executes a line connection to ensure communication with the oooeo remote handset terminal (step S107). After the connection 20 is made, the main terminal 11 clears the CLI flag of the 0@ pertinent remote handset terminal (step Sl08). For example, flags are set as is shown in Fig. 8A when the call is received; however, when remote handset terminal 1 responds to the call, the flag for it is cleared, as is shown on Fig.

8B.

12 When no response by a remote handset terminal is received (NO at step S106), the processing is thereafter terminated. Specifically, program control moves to a process that is performed when a caller hangs up, and the operational mode is returned to a normal mode, a call ring wait mode. The registration of a remote handset terminal will now be explained.

The operational mode is shifted to a registration mode by depressing a special button when the remote handset terminal is powered on. A register inputs an extension number and an encrypted code for the home use main terminal 11 and waits. Then, the main terminal 11 is activated while

S..

*a special button at the main terminal 11 is depressed, and waits for a call from the remote handset terminal. When the oooo main terminal 11 is ready, the remote handset terminal transmits data to begin the exchange of data with the main terminal 11. The main terminal 11 obtains from the remote handset terminal information concerning PSID and the S• extension number, while the remote handset terminal receives 20 key code for reading the encryption. The process is thereafter terminated. The remote handset terminal is thus registered in the home use main terminal 11.

As is shown in Fig. 9A, the four upper bits of the CLI data are assigned for the ist, 3rd, 5th, 7th, 9th, and 31st numbers and the lower four bits are assigned for the 13 2nd, 4th, 6th, 8th, 10th, and the 32nd numbers. When, for example, the telephone number of a caller is 03-5678- 1234, the format for storing the CLI data is as is shown in Fig. 9B. Fig. 10 is a diagram showing the setup for CLI flags corresponding to individual CLI data.

The processing for transmitting stored data to the remote handset terminal will now be described while referring to the flowchart in Fig. 11.

First, the remote handset terminal A requests position registration in the area of the home use main terminal 11 (step S111). Then, the main terminal 11 not only registers i the position of the remote handset terminal A but also confirms the number of the remote handset terminal A (steps S112 and S113), and searches for the pertinent number among the CLI flags (step S114).

When flag of the pertinent remote handset terminal is found, the controller 22 reads CLI data from the memory (step S115). The controller 22 permits the radio communication circuit 23 to transmit the data to the 20 pertinent remote handset terminal (step 5116). The controller 22 then clears the flag that was found (step S117).

When the controller 22 confirms that all the flags for the CLI data have been cleared (step S118), the controller erases the CLI data (step S119). The processing for the transfer of the CLI data is thereafter terminated.

14 In the above described embodiment, a conference call signal is transmitted once to the remote handset terminals after a call signal has been received. When there is no response, it is preferable that the conference call-signal be periodically retransmitted at a time interval that is determined in advance.

The main terminal may perform periodical polling to determine whether a remote handset terminal is available in the area of the main terminal. As a result, even when remote handset terminals in the area do not request position registration, the main terminal can transmit CLI data to a remote handset terminal that is detected by the polling.

S..

Further, time data included in the CLI data may be employed to collect the telephone numbers of callers oooo received during one day.

In the above embodiment, the CLI data are erased after having been transmitted to all the remote handset terminals.

~The CLI data may be erased when the data have been trans- S" mitted to one remote handset terminal. The main terminal 20 may have a function for switching these two data erasure operations.

A home use PHS has been employed in the above embodiment; however, the present invention is not thus limited, and can be applied for a system constituted by a main terminal and a plurality of remote handset terminals.

I

15 As is described above,according to the present invention, the home use main terminal stores the telephone numbers of callers who make calls while a user is absent.

And when a remote handset terminal is relocated to the area of the main terminal and accesses the main terminal for position registration, for example, the main terminal identifies the number of the remote handset terminal and transmits, to the remote handset terminal, the telephone number of the caller that is stored. Therefore, a user can identify a person who called while the user was absent, and can, as needed, call the caller back.

In addition, according to the present invention, since the telephone number of a caller can be transmitted to individual remote handset terminals, the individuals who have the remote handset terminals can identify the caller.

Furthermore, according to the present invention, the telephone numbers of calls that are received during one day can be accumulated by using a function for storing the oo o S" telephone numbers of callers. Therefore, the relative 20 urgency of each call received from callers in one day can be acquired and can be employed to select a person to be called back. Since the CLI data includes the date, the time and the telephone number of a caller, the controller employs the date data to accumulate the calls for one day.

Claims

1. A cordless telephone system including a main terminal connected to a cable and one or more remote cordless terminals communicating with the main terminal, the main terminal including: means for receiving caller line identification (CLI) data for a call received over said cable; position registration or polling means for detecting when a cordless terminal is active; means for transmitting the CLI data to all active cordless terminals; and means for automatically transmitting the CLI data to any further cordless terminals which become active at a later time. 15

2. A system according to claim 1, wherein the main terminal checks periodically whether or not each cordless terminal registered with the main terminal is available for communication..

3. A system according to claim 2, wherein the main terminal further includes a memory for storing received CLI data when one or more cordless terminals registered with the main terminal is/are inactive and CLI data is transmitted to each cordless terminal when it is next detected as active.

4. A system according to claim 3, wherein flags are employed to indicate whether individual remote terminals registered with the main terminal are active or inactive and said CLI data are stored in said memory in conjunction with a flag for each cordless terminal that is registered with the main terminal.

A system according to claim 3 or claim 4, wherein the main terminal includes switch means for causing the main terminal to switch between a first mode when the CLI data is stored until it has been transmitted to all of the cordless terminals and a second mode when the CLI data is erased from the memory before it has been transmitted to all of the cordless terminals registered when the main terminal. [R:\LIBQ]706.doc:e~a k a. -17

6. A cordless telephone system substantially as described with reference to the accompanying drawings. DATED this twenty-first Day of September, 2001 NEC Corporation Patent Attorneys for the Applicant SPRUSON FERGUSON R~1>

"7 [R:\LIHQ]706doc:caa