JPH07203539A - Digital cordless telephone system - Google Patents

Abstract

PURPOSE:To attain standbys for both an outdoor public system and a direct call between slave sets at the same time by providing a means for detecting incoming of a direct call between slave sets in the state of synchronizing with the outdoor public system. CONSTITUTION:The outdoor public system 1 transmits a logical control channel super frame, which is received by a radio part 3 and sent by way of a modulation and demodulation part 4 and a channel codec part 5 to a part 6 synchronize-controlling the outdoor public system. Then, an information channel in the received logical control channel super frame is analyzed to obtain a simultaneously reading channel and the simultaneous reading channel is intermittently received so as to be in the state of standby for an incoming call. During this, an inter-slave direct control part 7 receives a carrier for inter-slave direct call and detects call income to its own telephone system so as to attain standbys for the outdoor public system and an inter-slave direct call at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone.

[0002]

2. Description of the Related Art Conventionally, a digital cordless telephone receives an LCCH (logical control channel) superframe of a control carrier of an outdoor public system, receives a BCCH (broadcast channel), and analyzes it to receive it. PCH (Paging channel)
A mode that enables outgoing and incoming calls by synchronizing with the outdoor public system by performing intermittent reception that waits for incoming calls at the same timing, LCC of the control carrier of the private system
H (logical control channel) superframe received, B
By receiving and analyzing the CCH (notification channel), it synchronizes at the timing of the PCH (paging channel) that the digital cordless telephone receives, and by performing intermittent reception that waits for incoming calls, it synchronizes with the private system and makes incoming and outgoing calls. There are an independent mode and a mode in which an outgoing call for a direct call between handset units is made possible and an incoming call to the own digital cordless telephone is detected by receiving a carrier for direct call between handset units.

[0003]

Therefore, even when an incoming call is made in a direct call between handset units, the incoming call cannot be detected and the incoming call can be answered while synchronizing with the outdoor public system and waiting. There was a problem that I could not. Further, there is a problem that the incoming call of the outdoor public system cannot be detected when the standby mode is set in the direct call mode between the handset units.

Similarly, the self-employed system also had this problem. The present invention has been made to solve the above-mentioned problems, and provides a digital cordless telephone capable of simultaneously waiting for a direct call between handsets and waiting for an outdoor public system or a private system. That is the purpose.

[0005]

In order to solve the above problems, the present invention provides a synchronizing means for synchronizing with an outdoor public system, a transmitting / receiving means for transmitting / receiving an outdoor public system, and a slave unit. In a digital cordless telephone having a calling means for making a direct call between two handsets, a detecting means for detecting an incoming call in a direct call between handsets in a state synchronized with an outdoor public system is provided, and the outdoor public system and the handset It is designed to be able to simultaneously wait for both direct calls. Similarly, a means to synchronize with a private system,
Even in a digital cordless telephone equipped with an outgoing / incoming means for making and receiving calls to a private system and a calling means for making a direct call between handset units, an incoming call in a direct call between handset units is synchronized with the private system. By providing a detection means for detecting the above, it is possible to simultaneously wait for both the private system and the direct call between the child devices.

[0006]

The means for detecting the incoming call in the direct call between the handset units in the state synchronized with the outdoor public system can detect the incoming call in the direct call between the handset units in the state synchronized with the outdoor public system. Therefore, both the outdoor public system and the direct call between the handset units can be standby at the same time. Further, the detecting means for detecting the incoming call in the direct call between the handset units in synchronization with the private system can detect the incoming call in the direct call between the handset units in the state synchronized with the private system. Therefore, it is possible to simultaneously wait for both the private system and the direct call between the child devices.

[0007]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
Is a configuration example of the digital cordless telephone set forth in claim 1, wherein both the outdoor public system and the direct call between the handset units can be simultaneously standby. In FIG. 1, reference numeral 1 is an outdoor public system, 2 is a partner digital cordless telephone in direct communication between handsets, and 3 is a wireless unit for transmitting and receiving radio waves. Reference numeral 4 denotes a modulation / demodulation unit, which modulates or demodulates a transmitted / received signal. Reference numeral 5 denotes a channel codec section. The channel codec section 5 divides received data into each channel,
Alternatively, the transmission data is collected. An outdoor public system synchronization control unit 6 controls the synchronization with the outdoor public system and monitors incoming calls in the outdoor public system synchronization control unit 6. Reference numeral 7 denotes an inter-slave unit direct call control unit, which monitors incoming calls of an inter-slave unit direct call. Reference numeral 8 denotes a control unit. The control unit 8 controls the entire communication, and even when the outdoor public system synchronization control unit 6 is performing the synchronization control, the inter-slave unit direct call control unit 7 controls the slave unit. Controls to monitor incoming direct calls. Reference numeral 9 denotes a storage unit that stores an incoming call number for detecting an incoming call from the outdoor public system 1 or the partner digital cordless telephone 2. 1
Reference numeral 0 is a user interface unit.

FIG. 2 is a reception timing diagram when the system shifts to the standby state in synchronization with the outdoor public system or the private system, and FIG. 3 shows the standby between the outdoor public system or the private system and the slave unit. FIG. 7 is a reception timing chart when the standby of a direct call is performed at the same time. The outdoor public system 1 is transmitting the LCCH superframe. The wireless unit 3 receives this, and the modulation / demodulation unit 4 demodulates it. The demodulated signal is divided into each channel by the channel codec section 5, and the LCCH superframe signal is sent to the outdoor public system synchronization control section 6. BCCH in the LCCH superframe received in this way
Is received and the BCCH is analyzed to obtain the PCH to be received by the digital cordless telephone. This PC
Intermittent reception of H synchronizes with the public LCCH superframe. At this time, if the location registration is necessary, the location is registered with the public. By registering the location, you can receive incoming calls from the public.

As described above, by intermittently receiving the PCH, a standby state for waiting for an incoming call is established. And
In the standby state, the LCCH super frame is received every LCCH super frame period x maximum value of the battery saving period. During that time, the carrier for the direct communication between the handsets is received and the incoming call to the own digital cordless telephone is detected. As a result, the standby of the outdoor public system and the standby of the direct call between the handset units can be simultaneously performed. Alternatively, at this time, L of the outdoor public system
Every time the PCH of the CCH superframe is received several times,
An incoming call may be detected by receiving a carrier for direct communication between handset devices. In this state, when an incoming call is detected by the outdoor public system, the direct call control between the handset units is stopped and the outdoor public system control is performed to receive the incoming call. When a direct call between handset units is received, the outdoor public system control is stopped and direct call control between handset units is performed to receive the call. When the direct communication between the handset units ends, the synchronization control with the outdoor public system is performed again, and after the synchronization is established, the direct control between the handset units waits. When the LCCH super frame of the outdoor public system cannot be received, the LCCH super frame of the outdoor public system is searched while performing the standby control of the direct call between the slaves. When making each transmission, the other control is stopped and transmission control is performed.

FIG. 4 shows an example of the configuration of a digital cordless telephone set forth in claim 2 in which both the private system and the direct call between the handset units can be simultaneously standby. In FIG. 4, 11 is a system for private use. Reference numeral 12 is a partner digital cordless telephone in a direct call between handset devices. Reference numeral 13 is a radio unit for transmitting and receiving radio waves. A modulator / demodulator 14 modulates or demodulates a transmitted / received signal. Reference numeral 15 denotes a channel codec section, which divides received data into channels or collects transmitted data.
Reference numeral 16 denotes a self-employed system synchronization control unit, which controls synchronization with the self-employed system and monitors incoming calls. Reference numeral 17 denotes an inter-handset direct call control unit, which monitors the incoming call of the inter-handset direct call. Reference numeral 18 denotes a control unit, which controls the entire communication by the control unit 18, and the direct communication control unit 17 between the slave units directly controls the communication between the slave units even when the self-employed system synchronization control unit 16 is performing the synchronization control. Controls to monitor incoming calls. A storage unit 19 stores an incoming call number for detecting an incoming call from the private system 11 or the partner digital cordless telephone 12. 20 is a user interface unit.

Next, the operation of the digital cordless telephone of FIG. 4 will be described. First, the self-employed system 11 is L
CCH superframe is being transmitted. The wireless unit 13 receives this, and the modulation / demodulation unit 14 demodulates it. The demodulated signal is divided into each channel by the channel codec section 15, and the LCCH superframe signal is sent to the private system synchronization control section 16. LC received in this way
Receive BCCH in CH superframe
By analyzing H, the PCH to be received by the digital cordless telephone is obtained. By intermittently receiving this PCH, it is synchronized with the private LCCH superframe. In this way, by receiving the PCH intermittently, a standby state for waiting for an incoming call is set. When in standby mode, LCC
Since the LCCH superframe is received every H superframe period x battery saving period maximum value (s), by receiving the carrier for direct communication between the handset units and detecting the incoming call to the own digital cordless telephone during that time. , It is possible to simultaneously stand by for a private system and for direct calls between handset units. At this time, every time the PCH of the LCCH superframe of the private system is received several times, the carrier for the direct communication between the handset units may be received to detect the incoming call. In this state, when an incoming call is detected in the private system, the direct call control between the handset units is stopped,
Controls the system for private use and receives incoming calls. When a direct call between handset units is received, the private system control is stopped and direct call control between handset units is performed to receive the call. When the direct call between the handset units ends, the synchronization control with the private system is performed again, and after the synchronization is established, the direct control between the handset units waits. When the LCCH super frame of the private system cannot be received, while controlling the standby of the direct call between the handset units,
Search for LCCH superframes for private systems. When making each transmission, the other control is stopped and transmission control is performed.

[0012]

According to the present invention described above, the means for detecting the incoming call in the direct call between the handset units in the state synchronized with the outdoor public system is used in the direct call between the handset units in the state synchronized with the outdoor public system. It can detect incoming calls. Therefore, both the outdoor public system and the direct call between the handset units can be standby at the same time. Further, the detecting means for detecting the incoming call in the direct call between the handset units in synchronization with the private system can detect the incoming call in the direct call between the handset units in the state synchronized with the private system. Therefore, it is possible to simultaneously wait for both the private system and the direct call between the child devices.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a digital cordless telephone set forth in claim 1.

FIG. 2 is a reception timing chart when the digital cordless telephone of the present invention is synchronized with an outdoor public system and shifts to a standby state.

FIG. 3 is a reception timing chart when the digital cordless telephone of the present invention is simultaneously performing the standby of the outdoor public system and the standby of the direct communication between the handset units.

FIG. 4 is a block diagram showing a configuration example of a digital cordless telephone set forth in claim 2.

[Explanation of symbols]

 1 outdoor public system 2, 12 partner digital cordless telephone 3, 13 radio section 4, 14 modulation / demodulation section 5, 15-channel codec section 6 outdoor public system synchronization control section 7, 17 direct call control section between slaves 8, 18 control Part 9, 19 Storage part 10, 20 User interface part 11 Self-employed system 12 Other party's digital cordless telephone 16 Self-employed system synchronization control part

Claims (2)

[Claims] 1. A digital cordless telephone equipped with a synchronizing means for synchronizing with an outdoor public system, a transmitting / receiving means for transmitting / receiving to / from an outdoor public system, and a transmitting means for transmitting a direct telephone call between cordless handsets. The feature is that it is equipped with detection means for detecting an incoming call in a direct call between handset units synchronized with the outdoor public system so that both the outdoor public system and the direct call between handset units can be standby at the same time. A digital cordless phone. 2. A digital cordless telephone equipped with means for synchronizing with a self-employed system, means for making and receiving calls to and from the self-employed system, and means for making a call in a direct telephone call between handset units A digital cordless telephone characterized by being provided with detection means for detecting an incoming call in a direct call between handset units in a state of being synchronized with the system so that both a private system and a direct call between handset units can stand by at the same time.