JPH0556119A - Transmission system for display signal between base station and mobile station in cordless telephone system - Google Patents

Abstract

PURPOSE:To provide a transmission system of a display signal by which even when all radio communication units in the base station of a cordless telephone system are in a utilization state it can be displayed in a mobile station and which prevents communication connection time from becoming considerably delayed or the consumption current of a battery in the mobile station from considerably increasing. CONSTITUTION:When the radio communication unit is present which is not busy among the radio communication units at the time of transmitting a display signal displaying the utilization situation of the radio communication units between the base station having plural radio communication units and plural mobile stations, the display signal is sent to the mobile station 2 which is in intermittent reception at a regular cycle by using the radio communication unit RF2 (6). When the final set among the radio communication units which are not in busy state is busy, a display signal serving also as a control signal with a data length longer than the period is sent to the mobile station during intermittent reception at the shortened cycle by using the radio communication unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying the usage status of a wireless communication unit of a base station on a mobile station in a low power cordless telephone device.

[0002]

2. Description of the Related Art A cordless telephone device is provided with a base station (parent device) and a mobile station (child device), and a wireless line is connected between them to connect between the base station and the mobile station or via the base station. A call is made between the mobile station and an outside line.

In the communication between the base station and the mobile station of this cordless telephone device, at the start of communication, "control data" transmitted to call the partner station and "control signals" such as "response data" responding thereto are transmitted. Is transmitted through a “control channel” commonly used in the entire system, and “information signals” such as voice exchanged after communication is established between the base station and the mobile station are selected from a plurality of wireless channels. It is transmitted through the "call channel" assigned by the base station.

Further, in a small power cordless telephone device, when receiving a signal while not communicating, the receiving power source of the mobile station is periodically turned on / off in order to reduce current consumption of a storage battery built in the mobile station. This condition is called intermittent reception. The ratio of ON / OFF in the intermittent reception is set to, for example, about 0.1 second of one second is on and the rest is off.

In a conventional cordless telephone device, a device is made up of a base station having a plurality of wireless communication units and a number of mobile stations exceeding the number of the wireless communication units.

[0006] In this type of cordless telephone apparatus, if all of the plurality of radio communication units of the base station are used for communication with the mobile station, a new call from another mobile station cannot be accepted. Therefore, a device has been devised in which the mobile station has a function of displaying the usage status so that the usage status of the wireless communication unit of the base station can be known to each mobile station.

Such a cordless telephone device has m wireless communication units (RF) as shown in FIG.
1 to RFm) and n mobile stations (where n> m).

As shown in FIG. 4, the base station has a station line terminal 1 connected to a station line, a call circuit 8 for forming a call path between a mobile station and a station line, and a plurality of wireless communications. Unit (R
F1 to RFm) and a control unit 7 including a microcomputer for controlling each wireless communication unit. Further, each wireless communication unit RF1 to RFm includes an antenna 4, a receiving circuit 2, and a transmitting circuit 5. , A circuit that constitutes a communication path including a radio circuit 9 that connects the receiving circuit 2 and the transmitting circuit 5 to the antenna 4, a reception data decoding unit 3 that decodes received data, and a transmission that generates transmission data. The data generating unit 6 is provided.

On the other hand, each mobile station has an antenna 21, a receiving circuit 22, a transmitting circuit 25, a receiving circuit 22 and a transmitting circuit 25.
In addition to a circuit that configures a communication path including a wireless circuit 24 that connects the antenna 21 to the antenna 21, a receiver 28, and a transmitter 29, a reception data decoding unit 23, a transmission data generation unit 26, and a microcomputer A control unit 27, a display unit 30 for displaying the use status of the wireless communication unit, and a ten-key pad 31 as an input unit. Further, the wireless circuit 24, the receiving circuit 22, and the received data decoding unit 23 are intermittently or continuously provided. It comprises a receiving power source 32 for supplying electric current, and a storage battery which is a power source for the entire mobile station.

In this cordless telephone device, the conventional method of notifying the mobile station of the use status of the radio communication units (RF1 to RFm) of the base station is shown in FIG.
The timing chart will be described. (However,
Two wireless communication units, RF1 and RF2 (m
= 2), it is assumed that there are three mobile stations (mobile station 1, mobile station 2 and other mobile stations (n = 3)). ) Step 1: Radio communication units RF1 and R of the base station
When both F2 are in standby mode, the mobile station 1
When 31 is operated to make a call, the transmission data generation unit 26 receiving the signal of the control unit 27 forms control data, and this data is transmitted from the antenna 21 via the transmission circuit 25 and the radio circuit 24 to the control channel. Through the base station.

Step 2; This control data is the antenna 4 and the radio circuit 9 of the radio communication unit RF1 of the base station.
Then, the data is received by the receiving circuit 2, decoded by the received data decoding unit 3, and sent to the control unit 7 of the base station.

Step 4; In response to a command from the control unit 7 of the base station, the transmission data generation unit 6 of the radio communication unit RF1 forms control response data including a part of the data for designating the call channel, and the transmission circuit 5 And wireless circuit 9
Via the antenna 4 to the mobile station 1 via the control channel.

Step 5: This control response data is received by the receiving circuit 22 via the antenna 21 and the radio circuit 24 of the mobile station 1, decoded by the received data decoding unit 23 and sent to the control unit 27. The control unit 27 performs control for switching the channel for communication with the base station to the designated communication channel, and thereafter, after exchanging necessary data with the RF1 through the communication channel, the mobile station 1 and the RF1. Communication with is established.

Step 6; When the communication between the mobile station 1 and RF1 is established, the control unit 7 of the base station forms display data indicating that RF1 is in use, and Step 7: Using RF2, This display data is transmitted via the control channel to the mobile station 2 and other mobile stations that are performing intermittent reception.

Step 8: This display data is sent to the mobile station 2
And when the reception power supply 32 of the other mobile station is on, it is received by the reception circuit 22 via the antenna 21 and the radio circuit 24,
The received data is decrypted by the decryption unit 23 and sent to the control unit 27.
The controller 27 sends a signal to the display 30 to indicate that RF1 is in use.

Step 9: When the mobile station 2 makes a call to the base station during a call between the mobile station 1 and RF1, step 1
The control data formed by the mobile station 2 is transmitted through the control channel through the same procedure as in step 10; the control data is received by RF2 of the base station and step 11 is sent to the controller 7 of the base station.

Step 12: Based on the command from the control unit 7 of the base station, the RF2 transmits the control response data to the mobile station 2 through the control channel, and moves to the RF2 through the same procedure as steps 4-5. Communication is established with the station 2.

However, at this time, since the base station has no vacant wireless communication unit, it is not possible to transmit the display data indicating that the RF2 is in use to the other mobile stations.

As shown in FIG. 6A, the mobile station 2 and the other mobile stations which are receiving intermittently have the receiving power source 32 turned on only in the period t in the cycle T. ,
In step 7, the display data transmitted from RF2 needs to have a data length longer than T + t, as shown in FIG.

Further, in this transmission method, the use of RF2 cannot be displayed on other mobile stations. Therefore, in order to solve the drawback, a transmission method of the display signal shown in the timing chart of FIG. 8 is proposed as a suggestion. ing.

Step 1: When both the radio communication units RF1 and RF2 are in a standby state, the control station transmits the control data, and the step 2 is the R of the base station.
It is received in F1 and is sent to the control unit 7 of the base station in step 3;

Step 4; In response to a command from the control unit 7 of the base station, Step 5: The control response data for the mobile station 1 and the use of RF1 for the mobile station 2 and other mobile stations in the transmission data generation unit 6 for RF1. "Control response and RF1 in-use data" that doubles as display data for displaying
Are formed and transmitted to the mobile station 1 and the mobile station 2 performing discontinuous reception and other mobile stations through the control channel.

Step 6; The mobile station 1 which has received this data establishes communication with the RF 1, and the mobile station 2 and other mobile stations which are receiving intermittently receive data when the reception power source 32 is on. By receiving this data, the display 30 indicates that RF1 is in use.

Step 7: When the mobile station 2 makes a call during a call between the mobile station 1 and RF1, control data is transmitted from the mobile station 2, and step 8 is received by RF2 of the base station. 9: Sent to the control unit 7 of the base station.

Step 10: In response to a command from the control unit 7 of the base station, Step 11: In the transmission data generation unit 6 of RF2, control response data for the mobile station 2 and RF2 for other mobile stations are in use. "Control response / RF2 in-use data", which also serves as display data to be displayed, is formed and transmitted to the mobile station 2 and other mobile stations performing intermittent reception through the control channel.

Step 12: In the mobile station 2 which has received this data, communication is established with the RF 2, and in step 13; in the other mobile stations which are receiving intermittently, this data is received when the reception power source 32 is on. Is received and the display 30 indicates that RF2 is in use.

As described above, even when all the wireless communication units are in use, it can be displayed to the mobile station that all the wireless communication units are in use.

However, the "control response / RF1 in-use data" and the "control response / RF2" which are transmitted in this system are used.
The "in-use data" needs to be set to a data length of T + t or more, as shown in b of FIG. 6, in order to enable reception by the mobile station during intermittent reception.

Unlike the RF1 in-use data in the former method shown in FIG. 7, these data are transmitted in the process of communication connection between the calling mobile station and the base station, and therefore the data length thereof. Extending the delay delays the communication connection time by that amount.

Therefore, shortening T in the time T + t is not preferable because it increases the current consumption of the storage battery of the mobile station during intermittent reception, and shortening t shortens reception. There is a possibility that it will be impossible, and there is a limit in terms of the performance of the radio device.

[0031]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of these systems, and even if all of a plurality of radio communication units of a base station are in a use state, the mobile station can handle them. The transmission method of the display signal that enables the display, and even if the display is performed, the communication connection time is not significantly delayed and the current consumption of the storage battery of the mobile station is not significantly increased. Is intended to provide.

[0032]

According to the present invention, a base station provided with m (where m ≧ 2) wireless communication units,
In a transmission method of a display signal between a base station and a mobile station of a cordless telephone device including n (where n> m) mobile stations, when the number of wireless communication units in use is m-1 or less. , The non-use wireless communication unit transmits a display signal indicating the use status of the wireless communication unit to the mobile station which is receiving intermittently at a normal cycle, and the number of the wireless communication units in use reaches m. In this case, the m-th wireless communication unit is a signal having a data length longer than the shortened cycle to the mobile station which is intermittently receiving at the shortened cycle, and the display signal and the control are performed. A signal that also serves as a signal is transmitted.

In this transmission method, the mobile station
The intermittent reception cycle is shortened by the display signal received when the number of wireless communication units in use reaches m-1.

[0034]

Therefore, according to the present invention, while the unused wireless communication unit exists, the display signal indicating the usage status of the wireless communication unit is transmitted by the unused wireless communication unit during the intermittent reception. When the last one of the wireless communication units is in use, the wireless communication unit sends a display signal that also serves as a control signal to the mobile station that is receiving intermittently. The intermittent reception cycle of the mobile station at this time is shorter than the normal cycle, and the data length of the display signal which also serves as the control signal is set to a length slightly longer than the shortened cycle.

[0035]

(First Embodiment) A case where the display signal transmission system according to the present invention is applied to the cordless telephone device shown in FIG. 4 will be described.

In the first embodiment, the cordless telephone device includes a base station having two wireless communication units and three mobile stations, and the timing chart of FIG. 1 shows the communication connection procedure. As described above, the transmission method of the present invention will be described by taking as an example the case where the mobile station 1 first calls the base station and then the mobile station 2 calls.

Step 1: Radio communication unit R of the base station
When both F1 and RF2 are in the standby state, the control data is transmitted from the mobile station 1 that made the call, and is received at step 2; RF1 of the base station and sent to the control unit 7 of the base station.

Step 4: RF is given by a command from the control unit 7.
In the transmission data generation unit 6 of No. 1, the control response data for the mobile station 1 is formed and transmitted to the mobile station 1 through the control channel.

Step 5: Communication is established between the mobile station 1 and RF1 which have received this control response data.

Step 6: When the communication is established between the mobile station 1 and RF1, the control unit 7 of the base station causes the transmission data generation unit 6 of RF2 to reduce the intermittent reception cycle and the data indicating that RF1 is in use. Display data including data for instructing the transmission is formed and transmitted to the mobile station 2 and other mobile stations that are performing intermittent reception through the control channel.

Step 7: In the mobile station 2 and the other mobile stations, when the reception power source 32 is on, the display data is received and is decoded by the reception data decoding section 23 to output a signal to the control section 27.
Send to. The control unit 27 sends a signal to the display unit 30 to display that RF1 is in use, and also sends a signal to the reception power source 32 to shorten the intermittent reception cycle T by ΔT.
Change to ΔT.

Step 8: When the mobile station 2 makes a call to the base station during a call between the mobile station 1 and RF1, control data is transmitted from the mobile station 2 through the control channel, and step 9; It is received at RF2 and is sent to the control unit 7 of the base station in step 10;

Step 11: In response to a command from the control unit 7 of the base station, the transmission data generation unit 6 for RF2 controls the response data for the mobile station 2 and the RF for other mobile stations.
“Control response / RF2 in-use data” that also serves as display data indicating that 2 is in use is formed. The data length of this data is set to be slightly longer than T-ΔT. This data is transmitted from the antenna of RF2 to the mobile station 2 and other mobile stations performing discontinuous reception through the control channel.

Step 12; In the mobile station 2 which has received this data, communication is established with the RF 2, and Step 13; T
-Other mobile stations that are receiving intermittently in the cycle of ΔT receive this data when the reception power supply 32 is on and display it on the display unit.
30 indicates that RF2 is in use.

As described above, according to the display signal transmission method of the present invention, even when both RF1 and RF2 are in use, the display signal representing the RF1 and RF2 can be transmitted to the mobile station. The communication connection time between the calling mobile station and the base station is only delayed due to the transmission of its indication signal when the total number of wireless communication units is in use.
Moreover, since the intermittent reception period of the mobile station at that time is shortened, it is not necessary to make the data length of the display data so long, so that the delay is only slight. In addition, the increase in the consumption of the storage battery of the mobile station is only slight.

(Second Embodiment) In the second embodiment, in the cordless telephone apparatus, as shown in the timing chart of FIG.
The display signal transmission method of the present invention will be described by taking as an example the case where the RF2 calls the mobile station 2.

Step 1: In response to a command from the control unit 7 of the base station, the transmission data generation unit 6 of RF1 forms control data including a part of the data for designating the communication channel, and sends it to the mobile station 1. Sent.

Step 2: the mobile station 1 receives this control data, and step 3: the received data decryption unit 23 of the mobile station 1 decrypts it, and then the transmission data generation unit 26 of the mobile station 1 produces control response data. , The control response data is transmitted to the RF1 of the base station, and step 4; when the control response data is received by the base station, communication is established between the RF1 and the mobile station 1.

Step 5: When communication is established between the mobile station 1 and RF1, the control section 7 of the base station causes the transmission data generation section 6 of RF2 to reduce the intermittent reception cycle and the data indicating that RF1 is in use. Display data including data for instructing the transmission is formed and transmitted to the mobile station 2 and other mobile stations that are performing intermittent reception through the control channel.

Step 6; In the mobile station 2 and the other mobile stations, when the reception power source 32 is on, this display data is received and is decoded by the reception data decoding section 23 to output a signal to the control section 27.
Send to. The control unit 27 sends a signal to the display unit 30 to display that the RF1 is in use, and also sends a signal to the reception power supply 32 to convert the intermittent reception cycle T into T-ΔT shortened by ΔT.

Step 7: The control unit 7 of the base station sets RF2
In order to call the mobile station 2 by using, the control data for the mobile station 2 is transmitted in the transmission data generation unit 6 of RF2,
"Control data and RF2 in-use data" that also serves as display data indicating that RF2 is being used for other mobile stations
To form. The data length of this data is set to be slightly longer than T-ΔT. This data is transmitted from the antenna of RF2 through the control channel to the mobile station 2 and other mobile stations which are receiving intermittently at a cycle of T-ΔT.

Step 8: In the mobile station 2 which has received this data, Step 9: Decrypts this to form control response data and transmits it to RF2.

Step 10: When the base station RF2 receives this control response data, communication is established between the mobile station 2 and RF2.

Step 11; On the other hand, in other mobile stations,
When the "control data / RF2 in-use data" is received, the display 30 indicates that RF2 is in use.

Thus, even when a call is made from the base station, the fact that RF1 and RF2 are in use can be displayed to other mobile stations.

(Third Embodiment) In the display signal transmission system of the present invention, the number of wireless communication units installed in a base station is m.
(However m> 3), the number of mobile stations is n (however n> m)
The case is generalized and described.

In this case, the intermittent reception cycle of the mobile station is not changed and the number of wireless communication units in use is m until the number of wireless communication units in use reaches m-1.
Only when the number of mobile stations reaches -1 is the intermittent reception cycle of the mobile station shortened.

On the other hand, in the base station, when there is a non-used radio communication unit, the non-used radio communication unit is used to indicate to the mobile station which is receiving intermittently, the radio communication unit in use. When you send data and the last one of the unused wireless communication units changes to busy,
For the first time, a "control response and RFm in-use data signal" having a long data length is transmitted from the wireless communication unit.

The timing chart of FIG. 3 shows a state when the last radio communication unit (RFm) is used.

Step 1: Send control data from the mobile station i that made the call. Step 2: When this control data is received by the RFm of the base station, Step 3 is sent to the control unit 7 of the base station.

Step 4: In response to a command from the control unit 7 of the base station, the transmission data generation unit 6 for RFm controls the response data for the mobile station i and the RF for the other mobile stations.
“Control response and RFm in-use data” that also serves as display data indicating that m is in use is formed. The data length of this data is set to be slightly longer than T-ΔT. This data is transmitted from the antenna of RF2 through the control channel to another mobile station which is performing discontinuous reception.

Step 5: Communication is established with the mobile station i that has received this, and Step 6; An unused mobile station that is receiving intermittently at the cycle of T-ΔT receives this and wirelessly receives it. Displays that all communication units are in use.

[0063]

As is apparent from the above description of each embodiment, according to the display signal transmission method of the present invention, even when all the plurality of wireless communication units of the base station are in use,
A display signal indicating it can be transmitted to the mobile station. Therefore, the mobile station can check the usage status of the wireless communication unit of the base station, and thus unnecessary transmission of radio waves is not required.

The delay in communication connection due to the transmission is
When all the wireless communication units are in use, there is practically no problem because it occurs only slightly in the communication connection of the last wireless communication unit. Further, the current consumption of the storage battery of the mobile station is almost the same as that of the conventional display signal transmission method.

[Brief description of drawings]

FIG. 1 is a timing chart showing a transmission procedure of a display signal in the first embodiment of the present invention,

FIG. 2 is a timing chart showing a procedure of transmitting a display signal according to the second embodiment of the present invention,

FIG. 3 is a timing chart showing a procedure of transmitting a display signal according to the third embodiment of the present invention,

FIG. 4 is a block diagram of a cordless telephone device,

FIG. 5 is a block diagram showing the entire cordless telephone device.

FIG. 6 is a timing chart showing the relationship between the intermittent reception cycle of a mobile station and the length of display data;

FIG. 7 is a timing chart showing a conventional display signal transmission procedure;

FIG. 8 is a timing chart showing another conventional display signal transmission procedure.

[Explanation of symbols]

 RF1 to RFm wireless communication unit 1 station line connection terminal 2, 22 reception circuit 3, 23 reception data decoding unit 4, 21 antenna 5, 25 transmission circuit 6, 26 transmission data generation unit 7, 27 control unit 8 communication circuit 9, 24 Radio circuit 28 Handset 29 Handset 30 In-use display 31 Numeric keypad 32 Receive power supply

Claims (2)

[Claims] 1. A base station and a mobile station of a cordless telephone device comprising m base stations provided with wireless communication units (where m ≧ 2) and n mobile stations provided with n (where n> m). In the transmission system of the display signal during the period, when the number of the wireless communication units in use is m-1 or less, from the wireless communication unit not in use to the mobile station which is receiving intermittently at a normal cycle, When a display signal indicating the usage status of the wireless communication unit is transmitted and the number of the wireless communication units in use reaches m, the m-th wireless communication unit moves during intermittent reception at a shortened cycle. A base station and a mobile station of a cordless telephone device, characterized in that a signal having a data length longer than the shortened cycle and transmitting both the display signal and the control signal is transmitted to the station. Display signal between and Transmission system. 2. The mobile station changes the intermittent reception cycle from a normal cycle to the shortened cycle according to the display signal received when the number of the wireless communication units in use reaches m-1. The transmission method of the display signal between the base station and the mobile station of the cordless telephone device according to claim 1, wherein