JP2909356B2 - Cordless phone system - Google Patents

Abstract

PURPOSE:To obtain the cordless telephone system which can perform selectively whether a specific mobile station in a base station area is called or all mobile stations are called. CONSTITUTION:When incoming is executed to an in-telephone network exchange 100 from a caller terminal 10, a control part 102 decides whether the other party number contained in its incoming information designates a base station number or a mobile station number. In the case it is decided to be the base station number, the control part 102 connects a line to, for instance, a public base station 21c in accordance with the number concerned, and calls simultaneously all mobile stations in its radio area C through the base station concerned 21c. In the case it is decided to be number of a mobile station 30a-1, the control part 102 connects the line to a subscriber base station 20a, based on registering information of a position registering data base 101, and calls only the designated mobile station 30a-1 in its radio area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system for performing mobile radio communication between a mobile station used as a communication terminal device of a subscriber and a base station belonging to a subscriber facility or a public facility. .

[0002]

2. Description of the Related Art As is well known, a mobile phone system which has become very popular today is based on a communication system in which a base station designated by a mobile station number by a caller calls the designated mobile station. When this communication method is adopted in a cordless telephone system in which more mobile stations are arranged with respect to a base station, by specifying a mobile station number from a caller, only a specific individual carrying the mobile station can be specified. Call to provide call service.

[0003] On the other hand, with today's technological innovation, some cordless telephone systems of this kind that can be used together with existing telephone systems are being proposed. In this case, the cordless telephone system includes a base station connected to a public line of a certain telephone network (hereinafter, referred to as a public base station) and a base station connected to a subscriber line of a certain subscriber's home (hereinafter, subscribed to). (Also referred to as a base station).

In the cordless telephone system having such a configuration, when a certain caller attempts to make a call for a specific individual, the call can be easily dealt with by the above-mentioned calling method. When there is a request that an unspecified person can be called, a system in which only a specific mobile station can be called as in the conventional system is inflexible and inconvenient in operation.

[0005] As one of measures for solving such inconvenience, there is a method of keeping one of a plurality of mobile stations near a base station. However, according to this method, the mobility of the standby mobile station as a cordless terminal is greatly reduced, and an efficient system configuration cannot be realized.

[0006] Alternatively, a method of connecting a telephone to a subscriber base station by a wired line may be considered. However, even in this method, if a mobile station number is also assigned to the telephone, when the telephone is called, other mobile stations are not called even if they are in the vicinity of the base station. Did not expect a significant improvement in operational characteristics.

Further, as the most reliable method for solving the above-mentioned inconvenience, there is a method in which an existing subscriber line and a subscriber station of a cordless telephone system are used separately. Therefore, two types of telephone systems must be used, resulting in a remarkably uneconomical and complicated system configuration, which has not been practically practical.

In recent years, as many analog cordless telephone systems are used in homes and offices, etc., in order to construct a more advanced system,
A cordless telephone system using a digital time-division multiplexing method is being put to practical use under the name of PHP (Personal Handy Phone) or second-generation cordless telephone. As a feature of this system, the function of a car mobile phone, that is, a function of calling outdoors, is added to a conventional cordless phone. With the advent of the second generation cordless telephone system having the outdoor calling function, it becomes easier to realize a cordless telephone system linked to the above-mentioned existing telephone system, that is, a public base station and a subscriber base station coexist. It is getting.

[0009] However, the time division multiplexing system employed in the second generation cordless telephone system has the advantage of being efficient when making an outdoor call, but has the advantage of group reception of a plurality of mobile stations realized by the analog system. There is a problem that it is difficult to achieve or the efficiency is low.

More specifically, in this type of system, a base station transmits a paging channel (PCH) to a mobile station at certain time intervals in order to reduce power consumption. The mobile station receiving this PCH returns a response within a predetermined time (for example, after 2.5 ms). Therefore, if a group call is attempted, simply applying a group call will result in collisions of responses from multiple mobile stations, and the base station cannot receive these responses. Become.

In order to avoid this collision of responses, it is considered that the most appropriate method is to individually receive a plurality of mobile stations and receive an individual response. However, in this method, the PCH between individual mobile stations is considered. Since the transmission interval is determined, it takes a time (PCH transmission interval) × (the number of group mobile stations) to notify the incoming call, which is extremely inefficient in terms of the entire communication time, which is a serious obstacle to practical use. Had become.

[0012]

As described above, in the above-mentioned conventional cordless telephone system, only the mobile station number is used as the terminal call number, so that only a specific individual is called via a specific mobile station. On the other hand, there is a problem that the function of the conventional telephone is inferior to calling an unspecified partner around the subscriber base station or an unspecified individual in the house owning the subscriber base station. Further, in the conventional cordless telephone system employing the time division multiplexing method, since the incoming call is notified by the individual call of the time division multiplexing, the group incoming call to a plurality of mobile stations registered in the base station is received. It takes a long time to do it,
There was a problem that the efficiency of the call was particularly poor.

The present invention eliminates the above-mentioned problems, and allows a caller to select and call an unspecified number of parties or a specific party around a subscriber base station. It is an object of the present invention to provide a cordless telephone system that can provide a more advanced communication service having advantages and can realize a subscriber base station and a mobile station with a simple configuration.

[0014]

To achieve the above object, the present invention provides a mobile station used as a communication terminal of a subscriber in a public network, and a mobile station connected to a subscriber line of the public network. In a cordless telephone system for performing mobile radio communication with a subscriber base station connected to a public line or a public base station connected to a public line, the subscriber base station transmits call information from a calling terminal in the public network. Determining means for determining whether the destination information included in the destination information is the mobile station number or the own base station number, and calling only the mobile station corresponding to the mobile station number when the destination information is the mobile station number And call control means for calling all the mobile stations registered in the base station when the destination information is the base station number.

[0015]

[0016]

According to the present invention, when calling from a calling terminal,
While it is possible to add the number of a specific mobile station or base station to be called at the request of the caller, on the system side, the subscriber base station determines the destination based on the incoming information from the calling terminal. It is determined whether the number is a mobile station number or its own base station number. If the mobile station number is a mobile station number, only the mobile station is called. Call all mobile stations. For this reason, for example, when trying to call a specific individual, the caller only has to make a call with the number of the mobile station used by the specific individual from his own terminal as before, and a certain subscriber base station. When an unspecified individual in the vicinity is to be called, an unspecified individual in the vicinity of the desired subscriber base station can be called by making a call with the number of the subscriber base station added.

[0017]

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the overall configuration of a cordless telephone system according to one embodiment of the present invention. In this cordless telephone system, 100 is PSTN
(Switched telephone network) represented by a telephone network, 101 is a position registration database for registering position information and the like of each mobile station belonging to the telephone network, and 102 is a telephone network 1
00 is a control unit for controlling the exchange operation of 00. Of the lines in this telephone network, L2 and L3 are subscriber lines, L4 is a public line, and L1, L5, L6,... Are arbitrary lines.

An arbitrary line L1 of the telephone network 100 includes:
In this embodiment, a telephone terminal 10 used as a caller terminal is connected. A subscriber base station 20a is connected to the subscriber line L2 drawn to the house A,
1 accommodates mobile stations 30a-1 to 30a-3. In particular, a base station-integrated telephone 40a is connected to the subscriber base station 20a via a wired line. Similarly, the subscriber line L3 drawn to the house B includes the subscriber base station 20b.
Are connected, and the mobile stations 30b-1 and 30b are connected by the radio line M2.
b-2. Further, a public base station 21C is connected to the public line L4 and the subscriber line L4 of the telephone network 100, and the mobile station 30c-1 is accommodated in the own station wireless area C where communication can be performed by the wireless line M3.

As can be seen from the figure, this cordless telephone system has a configuration in which a mobile station is arranged at a public base station connected to a public line of a telephone network such as a PSTN (telephone public switched network), and It can be considered as a system realized by a combination with a configuration in which a subscriber base station and a mobile station are arranged in a house that owns a subscriber line of a network.

The outline of the basic exchange operation of this cordless telephone system is as follows. First, in the present invention, when a call is made from the caller terminal 10 to any other party in the system, any one of a specific mobile station, public base station, or subscriber base station in the system is used as the other party. The specified call can be made. Such calls are generally distinguished by the method of entering the desired mobile station number or base station number.

Here, consider the case where telephone network exchange 100 receives a predetermined call request from caller terminal 10. In this case, the control unit 102 of the telephone network exchange 100 performs the caller terminal 1 based on the destination number included in the call request.
From 0, it is determined whether the base station number has been designated or the specific mobile station number has been designated. Here, when the base station number is specified by the caller terminal 10, the control unit 102 connects the line to, for example, the subscriber base station 20a corresponding to the number based on the registration information of the location registration database 101. Next, the subscriber base station 20a simultaneously calls the mobile stations 30a-1, 30a-2, and 30a-3 (including the wired telephone 40a, if the telephone exists) in the building A in which the subscriber base station 20a is installed. Do.

On the other hand, when a specific mobile station number is designated by the caller terminal 10, the control unit 102 refers to the registration information of the location registration database 101, and the mobile station having the mobile station number, for example, 30a-3 searches for a base station whose location is registered. At the time of this search, the mobile station 30a-3 to be called at that time depends on which place (the movement status is indicated by a dotted line in the figure).
The searched base station will change to either the subscriber base station 20a or 20b or the public base station 21c. When the search is completed successfully, only the mobile station 30a-3 designated at this time is called via one of the base stations 20a, 20b, and 21c found by the search. If there is a response to the call from the mobile station 30a-3, the base station 20 used for the call at that time is called.
One of the wireless lines M1, M2, and M3 corresponding to a, 20b, and 21c is connected, and a call is made.

Next, the basic configuration and control operation of the subscriber base stations 20a and 20b arranged in the present system will be described. FIG. 2 shows the basic configuration of these subscriber base stations (represented by the reference numeral 20 for convenience). The telephone line interface unit 201 that manages the line interface with the telephone network 100 described above, And an extension control unit 202 for controlling connection / disconnection of a line to the mobile station 30 in the local station radio area, a radio control unit 203 for controlling a radio line, Antenna interface unit 204, telephone 4
0, a call registration unit 206 for managing position registration from a mobile station, and a control unit 207 mainly composed of a microprocessor and a memory for controlling the whole.
It is comprised including. With respect to the configuration of the base station 20, the telephone 40 may be omitted depending on the convenience of the system. In this case, the communication circuit unit 205 is inevitably provided.
Is also unnecessary.

In the base station 20 having such a configuration,
The location registration management unit 206 stores location registration information of the mobile station 30 (which may include registration cancellation) in the antenna interface unit 20.
4. The information is obtained through the wireless control unit 203 and supplied to the telephone network exchange 100 through the extension control unit 202 and the telephone line interface unit 201. Telephone network switch 100
When there is an incoming call to the telephone line interface unit 201, the control unit 207 extracts the number included in the incoming call information and determines whether the incoming call number is a base station number or a mobile station number.

When the base station number is designated, the control unit 207 performs the exchange control by the extension control unit 202, and all the mobile stations 30 and the telephones 40 registered in the location registration management unit 206. Are simultaneously called through the wireless control unit 203, the antenna interface unit 204, and the communication circuit unit 205, respectively. When a mobile station number is specified, the control unit 207 targets only the specified mobile station 30 that has been registered in the position registration management unit 206 and performs switching control by the extension control unit 202. The call is made through the wireless control unit 203 and the antenna interface unit 204.

Next, a more specific exchange control operation in the exchange 100 of the telephone network constituting this system will be described with reference to the flowchart shown in FIG. First, when the telephone network exchange 100 receives a call request from the caller terminal 10, the control unit 102 fetches a destination number included in the call request (S301), and determines whether the fetched number is a base station number. It is determined whether it is a mobile station number (S302).
Here, when it is determined that the base station number is designated, the control unit 102 performs line connection to the base station (subscriber base station or public base station) corresponding to the designated number (S303). On the other hand, when it is determined that the mobile station number is designated, the control unit 102 searches the location registration database 101 (S304) and receives location registration from the mobile station corresponding to the designated number. Locate the base station. Here, when a desired base station is detected, the control unit 102 performs a line connection to the detected base station (S305).

The base station connected to the telephone network exchange 100 responds to the call control of the telephone network exchange 100 by the following incoming call operation. An example of the incoming call operation at the base station will be described with reference to the flowchart shown in FIG. First, when the base station 20 receives an incoming call from the telephone network 100 (S401), the control unit 207 determines whether to call the base station or the mobile station according to the command information from the telephone network exchange 100 attached to the incoming call information. It is determined (S402). Here, the call type is determined in such a manner that the base station 20 follows command information from the telephone network exchange 100, but based on incoming information from the telephone network without relying on this type of command information. The base station itself may determine the type of call.

Here, when it is determined that the base station is to be called, the control unit 207 registers the location of the base station 20 and connects to all the mobile stations 30 and the base station 20 which can communicate at the time. A call is made to all the telephones 40 at the same time (S403), and a line is connected to the terminal that has answered the earliest among them (S404). On the other hand, when it is determined that the mobile station is to be called, the control unit 207 calls only the desired mobile station (S405), and waits for a response from the mobile station to connect the line (S406).

The above is an example of the operation of the base station when the call arrives at the subscriber base station 20. When the call arrives at the public base station 21, S402, S403 and S4 shown in FIG.
This can be handled by a control operation in which the process of step 04 is deleted.

In the cordless telephone system according to the present invention, the base station number and the mobile station number can be assigned, for example, by assigning the base station subaddress to the mobile station so that the base station and the mobile station can be selected. How to grant,
Various applications are possible, such as a dial-in system in which the base station and the mobile station are treated in the same manner, or a system in which the base station and the mobile station are designated by special rules.

Although not explicitly stated in the above embodiment, as described above, this kind of cordless telephone system can adopt the time division multiplex system. FIG. 5 shows a system configuration of a cordless telephone system adopting the time division multiplex system.
In the figure, a base station 22 includes a line interface unit 2
20, extension control unit 221, multiplex processing unit 222, CPU
223, a modulation modem 224, a demodulation modem 225, a transmitter 226, a receiver 227, a frequency synthesizer 228, and an antenna duplexer 229. This base station 22 is connected to the
Are connected to a telephone network as shown in FIG. 1, while three mobile stations 30, which are given codes A, B, and C for convenience, are accommodated by wireless lines.

In the system shown in FIG. 5, control signals and voice signals sent from the telephone network are processed by the line interface unit 220 and sent to the multiplex processing unit 222 through the extension control unit 221. Multiplexing processing unit 222
In the above, signal demultiplexing processing and timing generation are performed in accordance with the time division multiplexing method. The wireless unit including the modulation modem 224, the demodulation modem 225, the transmitter 226, the receiver 227, the frequency synthesizer 228, and the antenna duplexer 229 performs a process of modulating or demodulating a baseband signal and a filtering process to transmit and receive radio waves. Do. CP
U223 includes a microcomputer, a memory, and the like, and controls each functional circuit.

Next, FIG. 6 shows an example of a frame structure of a signal used for time division multiplex communication of the cordless telephone system shown in FIG. This example is a so-called 4
A frame structure of a channel TDMA-TDD scheme,
One frame is 5 ms, and four transmission channels and four reception channels are multiplexed in one frame. Further, one of the channels is used as a control channel, and the control channel is intermittently transmitted and received once every 300 ms, for example, so that the frequency utilization rate is increased. The control channel includes a broadcast channel (BCCH) and an incoming channel (PC
H), an individual control channel (SCCH), and the like.

Next, an individual incoming call processing operation in the system using the time division multiplexing method will be described with reference to a control sequence shown in FIG. In the system configuration shown in FIG.
When an incoming call is received from the telephone network, an individual incoming call is notified from the base station 22 receiving the incoming call to the designated mobile station A, B or C using the PCH. When the internal processing is completed in the mobile station that has received the notification, the mobile station uses the SCCH to transmit a link channel assignment request as a response signal to the incoming call. The timing of transmitting this link channel assignment request is 300 ms × n + 25 ms after receiving the PCH. Where 300
ms is a multi-frame interval, n is an integer of 0 or more, 25
ms is the transmission / reception slot offset time. afterwards,
When the base station 22 receives the link channel allocation request from the mobile station, after the internal processing is completed, the base station 22 further sends S to the mobile station.
A link channel assignment response is returned using the CCH. This allows you to specify the frequency and slot used for the call,
Thereafter, the mode shifts to the communication channel mode.

Next, a group incoming call processing operation in a system using the time division multiplex system will be described with reference to a control sequence of FIG. Similarly to the above, in the system configuration shown in FIG. 5, when there is an incoming call from the telephone network 100, the base station 22 receiving the incoming call sends the PCH to the mobile stations A to C at the timing of multiframe (intermittent reception). Is used to notify the incoming call of the group. For the notification of the group incoming call, a number (ID number or the like) different from the above-described individual incoming call or other special code is used. This group incoming signal is received by each mobile station (mobile stations A, B, and C in the example of FIG. 5) within the wireless area of the base station 22.

Next, the base station 22 communicates with each of the mobile stations A,
In consideration of the processing time in B and C, a normal individual incoming signal is transmitted individually to each of the mobile stations A, B and C 5 ms × x1 (x1> 0, integer) after the above-mentioned group incoming transmission. I do. The transmission timing of these individual incoming signals can be shortened by performing high-speed transmission within a range permitted by laws and regulations.

Each of the mobile stations A, B, and C has a PC
After receiving H, SCCH transmission / reception is carried out in the same procedure as for individual termination. Regarding the transmission timing of each signal at this time, for example, taking the mobile station A as an example, assuming that the PCH reception time is t1, the SCCH transmission is t1 + 300ms × n1.
(N1> 0, integer). Similarly, in the case of the mobile station B, t2 + 300 ms.times.n2 (n2> 0, an integer), and the SCCHs transmitted by the mobile stations A, B, and C do not collide.

In order to further clarify the above control operation, the incoming operation of the base station and the mobile station in the system of the second embodiment will be described with reference to flowcharts shown in FIGS. 9 and 10, respectively.

First, when a call arrives at the base station 22, the base station 22 operates according to the flowchart shown in FIG.
First, it is determined whether it is an individual incoming call or a group incoming call specifying one mobile station (S901). Here, when it is determined that the incoming call is an individual incoming call, according to the control sequence shown in FIG.
The individual incoming call processing is performed for the designated mobile station (SS902).

On the other hand, when it is determined that the incoming call is in the group, the base station 22 first performs the incoming call for all the mobile stations A, B, and C in the own station zone in accordance with the control sequence shown in FIG. (S903), and thereafter, an individual call receiving process using a special code or the like is performed for these mobile stations A, B, and C (S904).

On the other hand, in each of the mobile stations A, B, and C, first, the power of the receiver 227 is turned on, for example, every 300 ms in the intermittent reception mode according to the flowchart shown in FIG.
The receiving standby state of the PCH transmitted from the base station 22 is maintained (S1001). At this time, if there is an incoming call, each of the mobile stations A, B, and C analyzes the contents of the received PCH and determines whether it is an individual incoming call or a group incoming call (S
1002).

Here, when it is determined that an individual call is received, each of the mobile stations A, B, and C performs an individual call process (S1).
003). On the other hand, when it is determined that the incoming call is in the group, each of the mobile stations A, B, and C first exits the intermittent reception mode and enters the continuous reception mode (S1004). Thereafter, when each of the mobile stations A, B, and C receives the individual incoming call for the own station (S1004), the individual mobile station performs the individual incoming call processing (S10).
05).

[0044]

As described above, according to the present invention,
By specifying the mobile station number or the subscriber base station number by the caller, it is possible to individually call only the mobile station corresponding to the specified mobile station number or to the subscriber base station corresponding to the specified subscriber base station number. It is possible to selectively call all the mobile stations whose locations are registered, and to provide a more advanced communication service that has the advantages of both a mobile phone and a wired phone.

[0045]

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of a cordless telephone system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of a subscriber base station of the cordless telephone system shown in FIG.

FIG. 3 is a flowchart showing an exchange operation in the telephone network of the cordless telephone system shown in FIG. 1;

FIG. 4 is a flowchart showing an incoming call operation at a subscriber base station of the cordless telephone system shown in FIG. 1;

FIG. 5 is a diagram showing a configuration of a cordless telephone system according to another embodiment of the present invention employing a time division multiplex system.

FIG. 6 is a diagram showing an example of a signal frame structure used for time division multiplex communication of the cordless telephone system shown in FIG. 5;

FIG. 7 is a diagram showing an example of a control sequence relating to an individual incoming call operation in the cordless telephone system shown in FIG.

FIG. 8 is a view showing an example of a control sequence relating to a group incoming operation in the cordless telephone system shown in FIG. 5;

FIG. 9 is a flowchart showing an incoming operation of a base station in the cordless telephone system shown in FIG. 5;

FIG. 10 is a flowchart showing an incoming call operation of the mobile station in the cordless telephone system shown in FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 Telephone exchange 101 Location registration database 102 Control unit 10 Caller terminal 20a, 20b Subscriber base station 21c Public base station 30a-1 to 30a-3, 30b-1 to 30b-3, 30c-1
Mobile station 40a Wired telephone connected to subscriber base station A, B House accommodating subscriber base station C Wireless area of public base station L2, L3 Subscriber line L4 Public line L1, L5, L6 Arbitrary line M1, M2, M3 wireless line 201 telephone line interface unit 202 extension control unit 203 wireless control unit 204 antenna interface unit 205 communication circuit unit 206 location registration management unit 207 base station control unit 22 subscriber base station using time division multiplexing 220 telephone Line interface unit 221 Extension control unit 222 Multiplex processing unit 223 CPU 224 Modulation modem 225 Demodulation modem 226 Transmitter 227 Receiver 228 Frequency synthesizer 229 Antenna duplexer

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinji Kobayashi Inside NTT Mobile Communication Network Co., Ltd. 2-1-1 Toranomon, Minato-ku, Tokyo (56) References JP-A-3-234196 (JP) JP-A-4-43792 (JP, A) JP-A-53-131704 (JP, A) JP-A-1-293743 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB Name) H04B 7/24-7/26 H04Q 7/00-7/38

Claims (3)

(57) [Claims] A mobile station used as a communication terminal device of a subscriber in a public network, and a subscriber base station connected to a subscriber line of the public network or a public base station connected to a public line. In the cordless telephone system for performing mobile radio communication between the subscriber base station, the destination information included in the call information from a certain calling terminal in the public network is a mobile station number or its own base station number. When the destination information is a mobile station number, only the mobile station corresponding to the mobile station number is called, and when the destination information is the own base station number, the own base station is called. A cordless telephone system comprising: call control means for calling all mobile stations whose locations are registered. 2. The mobile station number and the base station number are set by a method of giving a sub-address of the base station as the mobile station number or giving the base station number and the mobile station number in the same manner. The cordless telephone system according to claim 1, wherein: 3. The subscriber base station has a telephone connected by wire, and the telephone is included in a call target when calling all mobile stations from the subscriber base station. 2. The cordless telephone system according to 2.