JPH1066147A - Base station for radio telephone equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of an equipment by alternately setting public mode and the business mode of a control channel by a prescribed period, so as to use both of a public base station of a radio telephone system and an independent master set of a cordless telephone in common. SOLUTION: A common use base station 1 is connected with the side of a telephone exchange station through ISDN line and communicate with a PHS terminal 2 registered to the side of a communication company of PHS by the public mode (a). The common use base station 1 functions as a master set for business and communicates (c) with a slave set for business 3 by an independent mode. The slave set for business 3 is registered to the communication company of PHS for communicating with another public base station 4 by the public mode (b) such as the PHS terminal 2. The common use station 1 alternately transmits control data for public and for independent by using a time slot transmitting the control channel of a TDMA frame. For example, control data for public is sent by a 20 frame period and that for business is sent by a 40 frame period to attain the function of both of the public station and the master set for business.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone base station suitable for application to, for example, a base station for communicating with a terminal for a radio telephone system called a personal handyphone system (PHS).

[0002]

2. Description of the Related Art As one of radio telephone systems, there is one called a personal handy phone system (hereinafter, referred to as PHS). In this system, as a base station that performs wireless communication with a terminal, communication is performed with the terminal at relatively low transmission power, and a narrow area with a radius of, for example, about 100 m is set as a service area by one base station. A large number of such base stations having a narrow service area are arranged to secure a service area that can be used by terminals.

Also, a terminal for this system (hereinafter, a terminal for this system is referred to as a PHS terminal) has a limited communication system for communicating with a base station, such as in a home called a digital cordless telephone device. The PHS terminal is registered in this digital cordless telephone base unit as a common communication system with the wireless telephone device used within the range, so that the PHS terminal is cordless around the base unit connected to the telephone line. Can be used as a telephone handset.

FIG. 8 is a diagram showing a use state of a conventional PHS terminal. A PHS terminal 52 is registered in a cordless telephone master unit (herein referred to as a private master unit) 51.
When the operation mode of the PHS terminal 52 is set to the self-employed mode (that is, a mode operating as a cordless telephone),
The PHS terminal 52 receives the control channel transmitted from the self-main unit 51 and stands by. At the time of calling or receiving, the corresponding control is performed by transmitting the corresponding control data using this control channel. , The PHS terminal 52 functions as a child device connected to the private parent device 51. In the self-service mode operating as a cordless telephone handset, the terminal 52 can receive an incoming call to the telephone number of the general subscriber line assigned to the self-service base unit 51. Further, at the time of making a call, the calling process is performed from the private parent device 51 via the general subscriber line, so that a relatively low telephone charge for the general subscriber line is applied.

When the operation mode of the PHS terminal 52 is set to the public mode (that is, the mode of operating as a PHS terminal), the PHS terminal 52 receives a control channel from a nearby public base station 52 and stands by. PHS
At the time of outgoing call or incoming call, corresponding control is performed by transmitting the corresponding control data using this control channel, and the PHS terminal 52 is connected to the communication network via the public base station 52. In the public mode operating as the PHS terminal, the PHS terminal 52
To the PHS telephone number (for example, a telephone number starting with 050) assigned to the PHS via the base station 52.
It can be received at the terminal 52. Also, at the time of calling, since the calling process is performed from the base station 52 via the PHS communication network, a call charge for the PHS slightly higher than the call charge for the general subscriber line is applied.

[0006] Even in the case of any of the modes, what is described as a control channel is a logically formed control channel. In this system, one transmission channel is physically prepared as a control channel. Not what is being done.

[0007]

By the way, in the case of the PHS system, since the service area covered by one base station is smaller than that of another radio telephone system, it is necessary to install a large number of public base stations. The telecommunications carriers that operate the PHS system are making efforts to expand the service area by installing many public base stations at predetermined intervals in telephone boxes, telephone poles, and the like on the road. However, in the case of PHS, since the transmission power of the public base station is small, radio waves from these public base stations installed outdoors are difficult to reach inside the building.

[0008] Therefore, in order to extend the service area into a building, it is necessary to install a public base station in the building. It is limited to places where many people gather, such as schools, and facilities that are used by unspecified people, but facilities that do not have many users (for example, relatively small restaurants and shops) Unless the administrator of the facility takes measures such as paying for the installation costs of base stations and telephone lines, there is little possibility that a public base station will be installed.

That is, for a facility such as a relatively small restaurant or store, the advantage of installing a public base station is that service improvement can be expected because the PHS terminal can be used in the store. The merit is small, and it is unlikely that the base station will be installed until a large amount of cost such as the installation cost of the base station and the installation cost of the telephone line is paid.

[0010] On the other hand, in recent years, the number of business establishments employing digital cordless telephone devices has increased, and in business establishments where digital cordless telephone devices have been installed, self-owned parent devices will be installed. In addition, if a public base station for PHS is further installed, it is necessary to separately install the private base station and the public base station and connect them separately to the telephone line, which wastes installation space and laying the telephone line. There were many inconveniences.

In view of the above, an object of the present invention is to make it possible to install a public base station for this type of system with a small burden.

[0012]

According to the present invention, as a radio telephone base station, a logical control channel for transmitting control data to and from a terminal includes a public mode control channel and a private mode control channel. , Which are alternately set at a predetermined cycle so as to function as both a public base station for a wireless telephone system and a self-owned parent device for a cordless telephone.

According to such a configuration, simply as one base station is installed and connected to a telephone line such as an ISDN line, use as a private base station and use as a public base station become possible.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

First, a system configuration to which this embodiment is applied will be described with reference to FIG. In this example, a public base station for a wireless telephone system called a personal handy phone system (PHS) and a private base unit for a digital cordless telephone are used as one large base station. Thus, the shared base station 1 shown in FIG. 1 corresponds to the base station. The shared base station 1 is connected to an exchange (not shown) by a telephone line such as an ISDN line,
The PHS terminal 2 registered on the communication carrier side performs communication a with the shared base station 1 in the public mode. The dual-purpose base station 1 is configured to be able to register a slave unit as a private-use base unit, and the private-use slave unit 3 registered with the dual-use base station 1 and the dual-use base station 1 in the private operation mode. Communication c is performed.

The PHS terminal 2 can of course communicate with other general public base stations 4 in the public mode b. However, the PHS terminal 3 is also registered with the PHS carrier. By allowing the terminal to be used also as a PHS terminal, communication with the public base station 4 in the public mode can be performed.

Next, the configuration of the shared base station 1 of the present embodiment is shown in FIG.
This will be described with reference to FIG. The dual-purpose base station 1 of this example includes two antennas 11 and 12 for performing diversity communication, and each of the antennas 11 and 12 is connected to a receiving unit 14 and a transmitting unit 20 via an antenna switch 13. . Receiver 1
4, a signal of a predetermined transmission frequency (the PHS terminal 2 or the private slave unit 3) based on the frequency signal supplied from the synthesizer 21 from the radio signals received by the antennas 11 and 12.
Is demodulated into an intermediate frequency signal, and the demodulated intermediate frequency signal is supplied to the digital demodulation unit 15. The digital demodulation unit 15 performs demodulation processing of the intermediate frequency signal based on the modulation method applied to this system,
From the demodulated data, the TDMA / TDD processing unit 16 performs a process of extracting data of a predetermined time slot. Note that TDMA applied in communication via the base station 1 of the present example
The / TDD method will be described later.

The processing in the TDMA / TDD processing unit 16 is as follows.
The control is performed based on the control by the control unit 22, and T
The control data such as call control extracted from the reception time slot by the DMA / TDD processing unit 16 is determined by the control unit 22. The audio data extracted from the reception time slot by the TDMA / TDD processing unit 16 is 32 kbps.
Is supplied to the ADPCM transcoder 17 and the audio data compressed by the ADPCM method is 64 kb.
Expand to ps data. Then, the decompressed audio data is supplied to the digital network interface 18, and
The B channel signal for ISDN is sent to the network side (ISDN line). Also, control data such as call control supplied from the control unit 22 to the digital network interface 18 is converted into a D-channel signal for ISDN and transmitted to the network side.

The data transmitted from the network side is converted into audio data of 64 kbps by the digital network interface 18 and supplied to the ADPCM transcoder 17 to be compressed by the ADPCM system.
kbps data. The control signal in the data transmitted from the network side is supplied from the digital network interface 18 to the control unit 22.

The audio data compressed by the ADPCM transcoder 17 is converted to a TDMA / TDD processing unit 16.
Performs processing for arranging the transmission time slot at a predetermined position. Then, the TDMA / TDD processing unit 16 adds control data and the like supplied from the control unit 22 to generate each transmission time slot, supplies the data of the transmission time slot to the digital modulation unit 19, and A phase modulation process for orthogonally modulating the signal and the Q signal is performed, and the modulated signal is supplied to the transmission unit 20, and the frequency is converted to a transmission frequency based on the frequency signal supplied from the synthesizer 21, and the antenna 11 Or 12 wirelessly.

The control unit 22 has a ROM as a memory in which a communication control protocol and the like in the base station are stored.
23 is connected, and is a writable memory RA for storing data and the like registered in the base station.
M24 is connected. The data stored in the RAM 24 includes, for example, data of a telephone number and a system call code common to the system when used as a base unit for a cordless telephone, and a self-service child registered in the local station. There is data such as the identification code (ID) of the machine. Regarding the registration of the self-employed child device, a plurality of identification codes (ID) may be stored and registered.

In the case of the base station of this embodiment, the receiving system,
The transmission system is configured so that communication with a plurality of (for example, up to three) terminals (child devices) can be simultaneously processed.

Next, a state in which communication is performed between the base station of the present embodiment and the PHS terminal or the self-service slave unit will be described.
The DMA method (Time Division Multiple Access method) is applied, and the TDD method (Time Division Multiple Access method) is used as the transmission method.
Communication is performed by the TDMA / TDD system to which the Duplex system is applied. Describing this communication method, communication is performed by repeating the frame configuration shown in FIG. That is, one time slot is set to 625 μsec, and one TDMA frame is constituted by eight time slots. First half 4
Time slots T1, T2, T3, and T4 are transmission slots from the base station, and the latter four time slots R1 and R4.
2, R3 and R4 are reception slots for the base station.

In this case, the slot T of the transmission slots
1 and a slot R1 of the reception slots are control slots, control data is transmitted between the base station and the terminal or the slave, and control such as transmission and reception is performed. And
Voice data for a call is transmitted using the remaining slots. In this case, one transmission slot T2, T3 or T4 in one frame and one reception slot R2, R
Communication is performed with one terminal or slave unit using 3 or R4, and one logical control channel and three logical communication channels are configured at one transmission frequency, Communication is performed at the same time with up to three terminals or slave units. In the following description, a time slot in which control data is transmitted is referred to as a control channel, and a time slot in which communication data is transmitted is referred to as a communication channel. Further, the transmission frequency of the time slot in which the control data is transmitted is different for the public use and the private use.

FIG. 4 is a diagram showing the structure of identification codes at the time of transmission and at the time of reception in data transmitted on the control channel in this system.
FIG. 4A shows the data structure transmitted from S) to the slave unit (PS). The data structure is composed of a 42-bit calling identification code and a 28-bit receiving identification code, and the calling identification code is a 29-bit system. It consists of a call code and a 13-bit additional ID, and the destination identification code is a 28-bit PS call code (PS
ID). The data configuration transmitted from the slave unit (PS) to the base station (CS) in the private system is the same as that at the time of transmission from the base station to the slave unit, as shown in FIG. 4B.

Next, the data structure transmitted from the base station (CS) to the terminal (PS) in the public system is shown in FIG. 4C, where a 42-bit calling identification code and a 28-bit called identification code are transmitted. The calling identification code is composed of a 9-bit business identification code and a 33-bit public additional ID, and the destination identification code is a 28-bit PS calling code (PS ID).
It consists of. The data structure transmitted from the terminal (PS) to the base station (CS) in the public system is shown in FIG.
As shown in the figure, the configuration is the same as that at the time of transmission from the base station to the slave unit.

In the base station of this embodiment, both the operation as the private system and the operation as the public system are performed simultaneously, and the control of the control data shown in FIGS. The transmission and reception on the channel (control time slot) and the transmission and reception of the control data shown in C and D in FIG. 4 on the control channel (control time slot) are periodically and alternately performed.

Hereinafter, the transmission and reception timings will be described.
Referring to FIG. 5, FIG. 5A is a diagram showing a frame configuration, in which one TDMA frame composed of eight time slots described in FIG. 3 is continuous. One TDMA frame is 5 ms. Then, control data is transmitted from the base station using the first time slot T1 of each frame. In this example, public control data is transmitted at a cycle of 20 frames (ie, a cycle of 100 ms). Using the time slot T1 in which the public control data is not transmitted, the private control data is transmitted at a period of 40 frames (ie, a period of 200 ms). Accordingly, one transmission slot for private control data is set while two transmission slots for public control data are set. The time slot T1 of the remaining frames is not used here.

FIG. 5B shows the structure of a public superframe in which only slots for transmitting public control data are transmitted at a period of 100 ms.
The control data of the slot constitutes a public logical control channel. Radio channel information and a broadcast message are transmitted in the first slot BC of these 10 slots, a link establishment request message and the like are transmitted in the seventh slot SC, and each incoming call group is transmitted in the other slots P1 to P5. Is transmitted.

FIG. 5C shows a configuration of a private superframe in which only slots in which private control data are transmitted at a period of 200 msec are collected. The control data of eight slots for 1.6 seconds is shown. , A logical control channel for private use is configured. First slot B of these eight slots
C, wireless channel information and a broadcast message are transmitted, a link establishment request message and the like are transmitted in the fourth slot SC, and incoming messages of each incoming call group are transmitted in other slots P1 to P3. .

The transmission frequency of the time slot in which the control data for public transmission is transmitted is different from the transmission frequency of the time slot in which the control data for private use is transmitted. , The transmission is performed by setting the transmission frequency to the corresponding frequency. This transmission frequency switching is performed by the synthesizer 21.
Is performed by switching the output frequency.

When the terminal operating in the public mode (that is, the PHS terminal) is in the standby state, as shown in FIG.
Any group of P5 to P5: Here, only the control data of P1) is intermittently received at a period of 600 msec and waiting for an incoming call. In the standby state, the terminal operating in the self-service mode (that is, the self-service cordless handset), as shown in FIG. 5E, is set to any one of the set slots (any one of the groups P1 to P3: Here, only the control data of P1) is 80
It receives intermittently at 0 ms intervals and waits for an incoming call.

Although only the transmission of the control channel from the base station has been described here, the transmission of control data to the base station when a call is made from the PHS terminal is performed in a time slot in which control data for the public is transmitted. It is transmitted using the time slot R1 of the frame paired with T1. In addition, the transmission of control data to the base station when a call is made from the private slave is transmitted using the time slot R1 of the frame paired with the time slot T1 in which the private control data is transmitted. You.

FIG. 6 shows a control sequence at the time of transmission from a terminal (slave) performed based on the transmission of control data.
When the terminal (child unit) goes off-hook,
A link channel establishment request is made, and a link channel is assigned from the base station. Up to this point, control is performed using a control frequency (control carrier), and thereafter, communication is performed at a communication frequency (communication carrier), transmission / reception of a synchronous burst, transmission / reception of call setting, and request for definition information. After a response, a function request and a response, a setting of a secret key, a function request and a response, an authentication request and a response, and the like, a call notification from the base station, and a response notification from the terminal (slave), Move to call communication. Here, at the stage of call setting, in the case of the public mode, a public telephone number (PHS
The terminal ID data is transmitted. In the case of the self-employed mode, the ID data of the slave unit corresponding to the extension number is transmitted.

Next, FIG. 7 shows a control sequence at the time of an incoming call to a terminal (slave unit) performed based on the transmission of control data. When it is determined that an incoming call from the network to the self-service cordless handset registered in the public telephone number is made, the public telephone number (PHS terminal I
D data) or incoming call data including the ID data of the slave unit corresponding to the private extension number is transmitted from the base station, and then a link channel establishment request is made from the corresponding terminal, and the base station transmits a link. Channel assignment is performed.
Up to this point, the communication is performed using a control frequency (control carrier), and thereafter, communication is performed at a communication frequency (communication carrier), transmission and reception of a synchronous burst, transmission of an incoming call response, transmission of a call setting, and After the reception, the request and response of the definition information, the function request and response, the setting of the secret key, the function request and response, the authentication request and the response, etc., the base station makes a call notification and the terminal (slave) ringer. After the is sounded, when the terminal (child device) goes off-hook, a response confirmation is performed, and the communication is shifted to a call communication. In the call setting stage, the public telephone number is transmitted in the public mode, and the ID data of the slave unit corresponding to the extension number is transmitted in the private mode.

The FACCH and the SACCH in each step shown in FIGS. 6 and 7 are a high-speed associated channel and a low-speed associated channel, and indicate a section in which data is transmitted in the corresponding step.

As described above, when the control channel is set and operated in the base station of this embodiment, both the operation as the public base station and the operation as the private base station are performed, and the PHS is operated. The connection from the terminal to the network side via the base station and the connection from the private slave unit to the network side via the base station (parent unit) are enabled. here,
The telephone line to which the base station of this example is connected is an ISDN line which is a digital line, and a plurality of terminals (slaves) and the base station can be connected at the same time by connecting by a ISDN line which can transmit data of a relatively large capacity. It is possible to communicate (separate the time slots used) and simultaneously connect to the network side. For example, in the frame configuration shown in FIG. 3, communication with the slave unit is performed using the time slots T2 and R2, and two units using the time slots T3 and R3 and T4 and R4. By performing communication with the PHS terminal, a total of up to three devices can be simultaneously connected in one TDMA frame. If a plurality of individual TDMA frames can be set at the same time using a plurality of transmission frequencies, the number of terminals (slaves) that can be connected simultaneously can be further increased.

On the communication network side connected to the base station, for example, it is possible to distinguish between a transmission in the public mode and a transmission in the private mode based on, for example, accompanying data transmitted from the base station at the time of transmission. Connection processing and call charge accounting processing can be controlled separately for the corresponding mode, and there is no inconvenience due to the mixture of public mode communication and private mode communication on the same line.

The use of each slot in one TDMA frame for public use or private use does not need to be fixedly determined, but the number of terminals that can be used simultaneously in the public mode is determined by the number of terminals that can be connected simultaneously by this base station. By subtracting at least one from the number, the incoming call or outgoing call in the self-employed mode is always possible regardless of the use state in the public mode, which is preferable. For example, if the base station of this example is configured to be able to simultaneously connect up to three terminals (slaves), only two PHS terminals can be connected simultaneously in the public mode.
Up to one device and leave the remaining one terminal (slave) that can be connected for the private mode, so that it can respond to incoming calls to the telephone number set in the private mode. Can be considered.

Although the base station of this embodiment operates as a base unit for cordless telephones, the base station for cordless telephones generally includes a handset (a receiver equipped with a microphone and a speaker). As a configuration attached to the base station in the example, communication from the handset to the communication network side (ISDN line side) may be performed. In this case, outgoing calls and incoming calls using the handset are handled as communication in the private mode.

In the above-described embodiment, the communication network connected to the base station is connected by an ISDN line through which a plurality of terminals can communicate at the same time. However, at least two lines connected to the base station are individually connected. May be connected to separate lines used for the public use and the private use. By doing so, it is possible to cope with connection using a general analog line.

In the above embodiment, the present invention is applied to a base station for a terminal connected to a communication network called PHS, but may be applied to a base station connected to other various wireless telephone systems. Of course. In this case, the frame configuration and the like described in the above embodiments are examples applied to the PHS, and in the case of another wireless telephone system, the frame configuration and the like need to be changed correspondingly. For example, CDMA
The base station may be configured as a base station for a wireless telephone system in which wireless communication is performed by a system (code division multiple access system) and a base station for a cordless telephone in which wireless communication is performed in a CDMA system.

[0043]

According to the present invention, only by installing one base station and connecting it to a telephone line such as an ISDN line, it becomes possible to use it as a private base station and as a public base station, It is possible to use both as a cordless telephone and a public wireless telephone system without separately installing a public base station and a private base unit. In this case, on the side where this base station is installed, by using a terminal registered in the base station (a cordless telephone handset), a call can be made at a low call rate for a general subscriber line, The same communication cost as when a cordless telephone device connected to a normal subscriber telephone is installed can be used, and the service of the public wireless telephone system can be performed without newly installing another public dedicated base station. Therefore, it is possible to promote the installation of a public base station for a user who uses the cordless telephone device, and there is a great merit for a communication carrier operating a wireless telephone system.

In this case, a telephone number for the own mode is set in the own station, and the terminal is registered in the own station in the self mode.
Register the ID code of the corresponding terminal, and when receiving a call to your own station with the set telephone number, give the registered ID code to the control channel of the private mode and make an incoming call request. When there is an outgoing request to which the identification code registered in is set, the outgoing call from the set telephone number is performed, so that the outgoing / incoming process in the self-employed mode is properly performed.

Further, at least one of a plurality of logical communication channels prepared for wireless communication between the base station and the terminal is set as a communication channel dedicated to self-employment, so that the base station prepares the communication channel. All communication channels will not be used for public mode communication,
When there is an incoming call to a private telephone number, it is possible to prevent a situation in which the incoming call cannot be processed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a base station according to one embodiment.

FIG. 3 is an explanatory diagram illustrating a frame configuration of a system to which an embodiment is applied;

FIG. 4 is an explanatory diagram showing a configuration of a transmission identification code and a reception identification code according to one embodiment.

FIG. 5 is a timing chart showing transmission / reception timing according to one embodiment;

FIG. 6 is a control sequence diagram at the time of transmission according to one embodiment.

FIG. 7 is a control sequence diagram at the time of an incoming call according to one embodiment.

FIG. 8 is a configuration diagram showing a conventional system configuration example.

[Description of Signs] 1 Dual-use base station, 16 TDMA / TDD processing unit, 22
Control unit

Claims (3)

[Claims] 1. A wireless telephone base station for performing wireless communication with a terminal, wherein a logical control channel for transmitting control data to and from the terminal includes a public mode control channel and a private mode control channel. Are alternately set in a predetermined cycle, and control data is communicated with a terminal registered in the wireless telephone system as the public mode on the control channel in the public mode, thereby allowing communication between the terminal registered as the public mode. To set a public communication channel, and perform control data communication with a terminal registered in the own station as the self-operating mode on the control channel of the self-operating mode. A radio telephone base station for setting a communication channel. 2. The radio telephone base station according to claim 1, wherein a self-mode telephone number is set in the self-station, and an identification code of the corresponding terminal is registered as a terminal registration in the self-station in the self-mode. Registered, when receiving an incoming call to the own station with the telephone number set above, the registered identification code is added to the control channel in the self-operating mode, and an incoming request is made. A wireless telephone base station configured to perform a calling process from the set telephone number when there is a calling request to which an identification code is assigned. 3. The wireless telephone base station according to claim 1, wherein at least one of a plurality of logical communication channels prepared for wireless communication between the base station and the terminal is used as a communication channel dedicated to self-employment. A radio telephone base station to be set.