JP2507410B2 - Wide area cordless telephone system - Google Patents

Description

The present invention relates to a wide area cordless telephone system, and more particularly to a wide area cordless telephone system in which one wireless zone includes a plurality of wireless connection devices.

[Conventional technology]

The telephone line is wirelessly connected to a portable wireless telephone (hereinafter referred to as RTEL) through a wireless connection device (hereinafter referred to as CE), and CE
A cordless telephone system is used, which allows a call to be made within the range around the location without restrictions.

Many RTELs in large areas (service areas) such as business sites
A wide-area cordless telephone system has been proposed in which each of these can be used as one of the local telephones.

In such a wide area cordless telephone system, a large number of CEs are distributed and installed in a service area, and each CE is shared by each RTEL.
For this sharing, one radio network controller (hereinafter referred to as RCU) is interposed between each CE and the exchange. The RCU constantly registers and updates the location information of which RTEL is currently in the range (radio zone) around which CE, and when making or receiving an RTEL, the RTEL of the radio zone in which it is currently CE
To the extension terminal corresponding to that RTEL of the exchange.

Control signals for location registration and connection processing are wirelessly transmitted between the RTELs and CEs on a control channel (hereinafter referred to as C-Ch). There are multiple call channels (hereinafter referred to as S-Ch) for wirelessly transmitting a call signal between each RTEL and CE, which are shared by each RTEL and CE. Therefore, each RTEL has a multi-channel access function.

In order to be able to handle multiple RTELs simultaneously in one wireless zone, multiple CEs are often placed in one wireless zone.

Each CE arranged in one wireless zone needs to take any one of various modes such as an idle S-Ch search mode, a C-Ch standby mode, and a call mode in cooperation with each other.

[Problems to be solved by the invention]

In the conventional wide area cordless telephone system described above, the mode to be taken by each of a plurality of CEs arranged in one wireless zone is centrally managed by the RCU, or each CE
Since it is decided individually by, the load of the RCU becomes too heavy in the former, and the latter requires a lot of hardware for mode control, which is disadvantageous.

An object of the present invention is to provide a wide area cordless telephone system that can economically manage each CE mode without increasing the load on the RCU.

[Means for solving problems]

The wide area cordless telephone system of the present invention includes a plurality of portable wireless telephones having a multi-channel access function,
Multiple groups are distributed and installed in the service area, one wireless zone is created for each of the groups, and wireless connection with the wireless telephones in this wireless zone is possible, at least control channel standby mode and call mode A plurality of wireless connection devices capable of taking any of a plurality of modes including, and is installed and connected to a private branch exchange or exchange, and stores the position information of which wireless zone each of the wireless telephones is in, and this position information A wide area cordless telephone system including a wireless line control device for automatically connecting an incoming / outgoing call of the wireless telephone within the service area by managing the connection between the extension terminal of the exchange and the extension terminal of the wireless connection device based on the , Which centrally manages the mode to be taken by each of the wireless connection devices of the one group. Configured to control means provided for each of the groups.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.

FIG. 1 (a) is a block diagram showing an embodiment of the wide area cordless telephone system of the present invention, and FIG. 1 (b) is FIG. 1 (a).
3 is a block diagram showing a CE group (hereinafter referred to as CEG) in FIG.

The embodiment shown in FIG. 1 (a) includes a plurality of RTELs 1, a plurality of CEGs 2 which are distributedly installed in a service area and each form a wireless zone, an RCU ₃ , and a PBX 4 which is connected to RCU ₃ by a plurality of extensions L _3. It is configured with. PBX4 has multiple station lines
L ₄ is connected.

The CEG2 includes a master CE (hereinafter, referred to as MCE) 25 and slave CEs (hereinafter, referred to as SCE) 26 to 28. MCE25 includes a contact line L ₂ in RCU3 the connected control circuit (hereinafter referred to CONT) 20, connected to the mode control line L ₅ in CONT20 connection line L ₁ and a CE21 connected with RCU3 configuration Has been done. SCE26~28 is a CE22~24 ones thereof, are connected to each mode control line L ₅ CONT20 RC connection line L ₁
It is connected to U3.

In CEG2, CONT20 via the mode control line L ₅ CE21
Controls ~ 24 modes.

FIG. 2 is an example of a state transition diagram of one CE mode.

CE, which shows the state transition in FIG. 2, is a sleep mode in which the operation is stopped (hereinafter referred to as X mode), a free S-Ch search mode (hereinafter referred to as A mode) for searching and storing a free S-Ch, C While waiting for -Ch, sometimes searching for S-Ch and free S
-The memory of Ch is updated, and the mode for accepting call processing (hereinafter referred to as C mode) and the call mode (hereinafter referred to as S mode) are sequentially taken to return to the X mode. When the duration of C mode exceeds a certain time (timeout), the mode is returned to A mode. The X mode may be skipped from the S mode to the A mode, or the X mode and the A mode may be skipped to the C mode. If a free S-Ch is not found in the A mode, the S-Ch is sometimes searched while waiting for the C-Ch, and the call processing cannot be accepted mode.

FIG. 3 is an explanatory diagram showing an example of a combined state of the modes of CE21 to CE24 in CEG2.

In state 31, no call is being made in the CEG2 wireless zone. CONT20 is CE21 in C mode, CE22 in A mode, CE
23 and CE24X mode. In this way, one CE is usually in C mode within one CEG2, and CONT20
Reports which CE is in C mode to RCU 3 via connection line L ₂ . It is C to set CE23, 24 to X mode
This is to reduce the power consumption of the EG2 as a whole.

When the position registration signal originated by RTEL1 in the wireless zone of CEG2 is received by RCU3 via CE21 (in the C mode), RCU3 registers the position of RTEL1 in the wireless zone. RCU3 may also poll RTEL1 in the wireless zone via CE21. Which of the RCU3 is used by the location registration operation from RTEL1 and polling from RCU3
The location information of which CEG2 wireless zone RTEL1 is in is being updated.

When making or receiving RTEL1 in the wireless zone of CEG2 in state 31, RCU3 connects the extension terminal of CE21 to the extension terminal of PBX4 corresponding to that RTEL1. The CE21 informs the S-Ch stored in the RTEL1, sets the transmission / reception frequency in the S-Ch, and shifts to the S mode. RTEL1 is also set to that S-Ch and the call starts. Along with the transition from C mode to S mode of CE21, CONT20 puts CE22 in C mode and CE23 in A mode (state 32).

If the C mode of CE22 times out in state 32, CONT20 sets CE22 to A mode and CE23 to C mode in preparation for the malfunction of CE22 (state 33). Then CE23 S
When moving to the mode, the CONT20 puts the CE22 in C mode and the CE24 in A.
Switch to mode (state 34). When this call is completed via CE21, CONT20 puts CE21 in X mode (state 35). Next, when CE22 shifts to S mode, CE24 shifts to C mode and CE21
To A mode (state 36).

As described above, the CE automatically shifts from the C mode to the S mode, the CONT 20 switches the mode of the other CEs as necessary, and the CE in the S mode terminates the call or the C -When a CE in mode times out, this
Mode switching of CE and other CE as required.

As described above, one embodiment of the present invention has been described for the case where the CEGs that make up the wireless zones each include one MCE and three SCEs.However, MCE25 is separated into CONT20 and CE21, and the separated CONT20 has four CE21 to CEG can also be configured to centrally manage the modes of the
The present invention can also be applied to a case where a plurality of CEs other than four are provided.

〔The invention's effect〕

As described in detail above, the wide area cordless telephone system of the present invention has one CONT for each CE group that makes up one wireless zone, and the CONT centrally manages the mode of each CE of the CE group. And the required CO for the entire system
Since the number of NTs is small, there is an effect that each CE mode can be economically managed without increasing the load on RCU.

[Brief description of drawings]

1 (a) is a block diagram showing an embodiment of a wide area cordless telephone system of the present invention, FIG. 1 (b) is a block diagram showing a CE group in FIG. 1 (a), and FIG. 2 is , First
Third example of state transition diagram of CE mode in FIG.
The figure is an explanatory view showing a state example of a combination of modes of each CE in the same CEG. 1 ... RTEL (wireless telephone), 2 ... CEG (wireless connection device group), 3 ... RCU (radio line controller), 4 ... PBX (private branch exchange), 20 ... CONT (control circuit), 21 ~ 24 …… CE
(Wireless connection device).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Yoshitoshi Murata 1-2356 Takeshi, Yokosuka City, Nippon Telegraph and Telephone Corporation, Research Institute for Communication Networks No. 2 (72) Masahiko Hirono 1-2356, Takeshi, Yokosuka Nippon Telegraph Minoru Shimizu (56) References, Communication Network Research Laboratories, Telecom Co., Ltd. (56) References JP 62-48136 (JP, A) JP 62-69739 (JP, A) JP 63-217729 (JP, A)

Claims (1)

(57) [Claims] 1. A plurality of portable wireless telephones having a multi-channel access function, and a plurality of groups are distributed and installed in a service area, and one wireless zone is formed for each of the groups. A plurality of wireless connection devices that can be wirelessly connected to the wireless telephone inside and can take any of a plurality of modes including at least a control channel standby mode and a call mode, and are installed and connected to a private branch exchange or an exchange. The wireless information is stored in the service area by storing position information of which wireless zone each is in, and managing the connection between the extension terminal of the exchange and the extension terminal of the wireless connection device based on the position information. In a wide area cordless telephone system provided with a non-turning line control device for automatically connecting incoming and outgoing telephone calls, A wide area cordless telephone system characterized in that each of the groups is provided with a mode control means for centrally managing the mode to be taken by each of the wireless connection devices of the group.