JP2957860B2 - Digital cordless telephone equipment - Google Patents

Abstract

PURPOSE:To efficiently ensure a data transmission line between a base station and a mobile station by providing plural compression encoding/-combined means and a capacity control means and setting dynamic data transmission speed from the status of the free channel and vacant capacity of a radio information channel. CONSTITUTION:When the connection request or the cut request of a call is generated, whether the request is either one of them is judged. When the request is the connection request, the presence or absence of a radio information channel is confirmed. When the channel exists, a capacity control means 3a confirms the vacant capacity x of the channel. The vacant capacity value x is divided into the half capacity and whether a communication is possible or not is judged. Namely, x/ 2 and m/2<n> (minimum speed capacity call value) are compared. When the x/2 is larger, the radio information channel is subdivided by the unused compressing/combing means 1b and 2b within a control part 1b and a data transmission line is efficiently ensured.

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 apparatus, and more particularly, to a plurality of mobile stations, a plurality of base stations connected to the plurality of mobile stations by radio, and a plurality of base stations connected to the extension side. Main unit or PBX (Private Br)
anch Exchange) and having a plurality of compression encoding / decoding means, in a digital cordless telephone device capable of sub-rate communication control, a capacity management for managing a radio information channel and a free capacity of the radio information channel. The present invention relates to a digital cordless telephone device that efficiently secures a data transmission path by providing means.

[0002]

2. Description of the Related Art A conventional analog cordless telephone device is:
It is composed of one master unit and one slave unit, or one master unit and a plurality of slave units, but only one wireless channel is secured between the normal master unit and the slave unit. Therefore, only one slave unit can be connected at a time. A TDMA (Time Division Multiple Access) system is adopted as a data transmission system for a wireless portion of the digital cordless telephone device. For a carrier of one frequency, four channels having a data transmission speed of 32 kb / s correspond to four channels. Since the mobile stations are multiplexed, a maximum of four mobile stations can be simultaneously connected to one carrier.

[0003]

As described above, the conventional digital cordless telephone apparatus can simultaneously connect a plurality of mobile stations to one base station. However, the current data transmission method between the base station and the mobile station of the digital cordless telephone device includes a TD in which four time slots are time-division multiplexed with respect to one frequency carrier.
Since the MA system is adopted, only a maximum of four mobile stations can be simultaneously connected to one carrier.
That is, when a base station provided with only transmission / reception hardware corresponding to a carrier wave of one frequency is employed, the fifth mobile station is connected to the base station in a state where four mobile stations are wirelessly connected to the base station. If a communication request is issued from the first mobile station, or if a communication request is issued to the fifth mobile station from the central office, communication using the fifth mobile station is impossible. Connecting five or more mobile stations to one base station can be realized by using carriers of a plurality of frequencies. However, if carriers of multiple frequencies are used between the base station and the mobile station, mutual interference between the carriers and the need to prepare transmission / reception system hardware for the multiple carriers at the base station, etc. Problems arise.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and manages a free channel and a free capacity of a radio information channel capable of controlling subrate communication between a mobile station and a base station of a digital cordless telephone device. It is another object of the present invention to provide a digital cordless telephone device capable of efficiently securing a data transmission path.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of mobile stations, a base station wirelessly connected to the plurality of mobile stations, and a method for connecting the plurality of base stations to an extension. A digital cordless telephone device comprising a main unit or a PBX to be accommodated, wherein a radio information channel between a mobile station and a base station of the digital cordless telephone device is transmitted by a plurality of compression encoding / decoding means to the predetermined data. In a digital cordless telephone device that divides a call into a plurality of low-capacity calls that are slower than the transmission speed and enables sub-rate communication control, when a call is connected by a data transmission request, sub-rate communication control is applied. It checks whether there is a wireless information channel that is present, and if there is already a wireless communication channel to which subrate communication control is applied, Check the free capacity of the channel, and if there is no wireless communication channel, check the free capacity of any free wireless information channel and subdivide the capacity until it becomes physically impossible. Thus, a capacity management means for managing a capacity that allocates a lower capacity than a free capacity to a new call is provided, and a data transmission path is efficiently secured.

[0006]

The digital cordless telephone according to the present invention comprises a plurality of mobile stations, a base station wirelessly connected to the plurality of mobile stations, and a main unit or PBX accommodating the plurality of base stations on the extension side. A sub-rate communication control unit configured to divide and control a radio information channel between a mobile station and a base station into a plurality of low-speed capacity calls by a data compression encoding and decoding scheme; Capacity management means for managing the free space in the wireless information channel, so that the data transmission capacity between the mobile station and the base station of the digital cordless telephone device can be effectively used.

[0007]

Embodiments will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining an embodiment of a digital cordless telephone device according to the present invention.
1 to 1-n are mobile stations, 1a is a radio transmission / reception unit, 1b is a sub-rate communication control unit, 2-1 to 2-2n are base stations, 2a is a radio transmission / reception unit, 2b is a sub-rate communication control unit, and 3 is a main unit. Or PBX (Private Branch Exchange), 3a is a capacity management means.

The digital cordless telephone apparatus includes a plurality of mobile stations 1-1 to 1-n, base stations 2-1 to 2-n wirelessly connected to the plurality of mobile stations, and a plurality of base stations. And a PBX 3 that accommodates the PBX on the extension side. Mobile station 1-1 to 1-n and base station 2-1 to 2-
2n is a sub-rate communication control provided with compression encoding / decoding means using a plurality of compression encoding / decoding methods for dividing a wireless information channel physically connecting them into a plurality of low-speed capacity calls. Units 1b and 2b and wireless transmitting / receiving unit 1
a and 2a. Also, the main unit or PBX
3 has a capacity management means 3a for managing the free wireless information channel and the free capacity in the wireless information channel. However, the capacity management means 3a may not necessarily be provided in the main device or the PBX, but may be provided in each base station.

In the digital cordless telephone device,
Main unit or PB of the digital cordless telephone
X, or a capacity management means 3a provided in the base station, manages the number of free channels and the free capacity of the radio information channel between each base station and a plurality of mobile stations wirelessly connected to the base station, Until the division by the sub-rate communication control units 1b and 2b becomes physically impossible, the wireless information channel is subdivided, so that a data transmission path can be efficiently secured.

FIGS. 2 to 4 are flow charts for explaining the operation of the capacity management means. Hereinafter, the steps will be sequentially described. Note that, for simplicity of explanation,
The following description is provided for one base station provided with wireless transmission / reception system hardware corresponding to one frequency carrier. For the same reason, the sub-rate communication control is applied to only one of the wireless information channels. Further, the sub-rate communication control unit stores the data of m (kb / s), which is the data transmission rate of the wireless information channel, as 1 / (2 n) of m (kb / s) (where,
(where n is a natural number) has a plurality of compression encoding / decoding means for performing compression encoding and decoding of data having a data transmission speed of (n).

First, in a request waiting state (step 1), when a call connection request or a disconnection request is generated (step 2), it is determined which request is made (step 3). If the generated request is a connection request in step 3, the capacity management means first checks whether there is a wireless information channel (step 4). In step 4,
When there is no free wireless information channel, that is, when the number N of free wireless information channels is 0, the capacity management unit performs sub-rate communication control in the already connected wireless information channel. It is confirmed whether or not a channel is present (step 5).

In step 5, if there is no radio information channel for sub-rate communication control, the call cannot be connected, so a disconnection procedure is started (step 6). , And return to step 1. Also, in step 5, if there is a wireless information channel that is performing sub-rate communication control,
The capacity management means uses the free capacity value x (k) of the wireless information channel.
b / s) is confirmed (step 7). Step 7
In the case where the free capacity value x (kb / s) is not 0, that is, if there is free capacity, it is determined from the free capacity value and divided into half the capacity of the free capacity value. It is determined whether communication is possible (step 8). That is, x / 2 (kb / s) and m / (2 n
Power) (kb / s).

Here, x / 2 (kb / s) is equal to m / (2 n) (kb / s), or m (kb / s).
If it is larger than s), it is determined that the free capacity can be divided into half the capacity by the subrate communication control. In the opposite case, it is determined that the free space cannot be further divided.
However, in this determination, since the division is possible / impossible only from the free space value, it is necessary to provide a determination from the physical conditions in the next step.

If it is determined in step 8 that the free space can be further divided into half of the capacity for communication, that is, x / 2 (kb / s) ≧ m
In the case of / (2 n) (kb / s), among the plurality of compression encoding / decoding means of the sub-rate communication control unit, the currently unused compression encoding / decoding means To determine the possibility of call connection (step 9). In step 9, y (kb / s) = x / 2 at a data transmission rate y (kb / s) that can be supported by unused compression encoding / decoding means in the sub-rate communication control unit.
If a compression encoding / decoding means that satisfies the condition of (kb / s) exists, the data transmission rate x / 2
(Kb / s) sub-rate communication control is determined, and negotiations regarding the sub-rate communication control are performed between the mobile station and the base station that issued the connection request, and the data transmission rate x /
2 (kb / s) low-speed capacity call connection (step 1)
0). Further, the free capacity value x (kb / s) is expressed as x / 2.
(Kb / s) (step 11), and transition to step 1.

In step 9, if there is no compression encoding / decoding means which satisfies the condition of y (kb / s) = x / 2 (kb / s) in the sub-rate communication control, y It is confirmed whether or not there is a compression encoding / decoding unit that satisfies the condition of (kb / s) <x / 2 (kb / s) (step 12). In step 12, if there is a compression encoding / decoding means satisfying the above condition in the sub-rate communication control section, the maximum data transmission rate y _MAX (among the compression encoding / decoding means satisfying the condition exists). kb / s), the sub-rate communication control by the compression encoding / decoding means is determined, a negotiation on the sub-rate communication control is performed between the mobile station and the base station that issued the call connection request, and the data transmission rate y A low-speed capacity call of _MAX (kb / s) is connected (step 13). Additionally, updates of free space x a (kb / s) to _{(x-y MAX) (kb} / s) ( step 14), the process proceeds to step 1.

In step 12, if there is no compression encoding / decoding means which satisfies the condition of y (kb / s) <x / 2 (kb / s) in the sub-rate communication control unit,
In y (kb / s), y (kb / s) = x / 2 (kb /
It is checked whether there is a compression encoding / decoding unit that satisfies the condition of s) (step 15). In step 15, if there is a compression encoding / decoding unit that satisfies the above condition in the sub-rate communication control unit, the data transmission rate x (kb
/ S), the sub-rate communication control using the compression encoding / decoding means corresponding to the sub-rate communication control is determined, a negotiation regarding the sub-rate communication control is performed between the mobile station and the base station which issued the call connection request, and data transmission is performed. A low-speed capacity call with a speed x (kb / s) is connected (step 16). Further, the free capacity value x (kb / s) is updated to 0 (step 1).
7), transit to step 1.

In this case, the base station uses the data transmission capacity of all the radio information channels by connecting the call for which the connection request has been issued, so that it is impossible to secure another data transmission path any more. . Also, in step 15, the sub-rate communication control unit sends y (kb / s)
= X (kb / s), if there is no compression encoding means that satisfies the condition, call connection is impossible, and a call disconnection procedure for a connection request is entered (step 6). Is completed, the process returns to step 1.

If it is determined in step 8 that it is impossible to divide the free space by half for communication, that is, x / 2 (kb / s) <m / (2 n)
In the case of (kb / s), the condition of x = m / (2 n) is satisfied at the same time, and the process proceeds to step 15 to perform the processes of step 15 and subsequent steps. In step 7, if the free capacity value x (kb / s) of the wireless information channel performing the sub-rate communication control is 0, there is no free data transmission path in this base station. A call disconnection procedure for the request is entered (step 6), and after the disconnection procedure ends, the procedure returns to step 1. Step 5
In, if there is no wireless information channel performing the sub-rate communication control, a call disconnection procedure for a connection request is entered (step 6), and after the disconnection procedure is completed, the process returns to step 1.

If it is confirmed in step 4 that an empty channel exists in the radio information channel,
If the number N of available wireless information channels is not 0, it is determined whether the number N of available wireless information channels is 1 (step 18). If it is determined in step 18 that N = 1, it is checked whether there is a channel for which sub-rate communication control is being performed among the already connected wireless information channels (step 19). In step 19, if there is a wireless information channel for which subrate communication control is being performed, in step 4, the confirmed free wireless information channel is connected (step 20). Further, the number of available wireless information channels N
Is updated to a value obtained by subtracting 1 from the current value of N (step 21), and the process returns to step 1.

In step 19, if it is not confirmed that there is a radio information channel performing the sub-rate communication control, it is determined that the sub-rate communication control is to be performed on the only vacant radio information channel, and To the free space value x (kb / s) of the default value m
(Kb / s), that is, the capacity value of the wireless information channel is set (step 22), and the process proceeds to step 8. Also,
If it is determined in step 18 that N ≠ 1,
In other words, when there are a plurality of free wireless information channels, the process proceeds to step 20, where one of the free wireless information channels confirmed in step 4 is connected (step 20). 2
The process proceeds to 1 and subsequent processes.

If it is determined in step 3 that the generated request is a disconnection request, the data transmission rate z (kb / s) of the call for which the disconnection request has occurred is expressed as z (kb / s) = m.
It is determined whether the condition of (kb / s) is satisfied (step 23). In step 23, if the above condition is satisfied, that is, if the call for which the disconnection request has been issued is a call for which subrate communication control has not been performed, the number N of available wireless information channels is changed to the current value of N. Is updated to a value obtained by adding 1 from (step 24), and a call disconnection procedure is started (step 6). In step 23, z (k
b / s) ≠ m (kb / s), that is, if the call for which the disconnection request has occurred is a call by sub-rate communication control, the free capacity value x (kb / s) It is updated to (x + z) (kb / s) (step 25).
Further, the updated free capacity value x (kb / s) is compared with the capacity value m (kb / s) of the wireless information channel (step 26).

In step 26, x (kb / s) ≠
m (kb / s), that is, even if the low-speed capacity call for which the disconnection request has been issued is performed, the low-speed capacity call during communication is included in the wireless information channel including the low-speed capacity call. If there is another call, the procedure for disconnecting the call is started as it is (step 6). If x (kb / s) = m (kb / s) in step 26, that is, by disconnecting the low-speed capacity call for which the disconnection request has been issued, the radio including the low-speed capacity call is disconnected. If the information channel becomes a free channel, the free capacity value x (kb / s) of the wireless information channel is updated to 0 (step 2).
7) Further, the number N of available wireless information channels is changed to the current N
Is updated to a value obtained by adding 1 from the value of
4) A call disconnection procedure is started (step 6).

As described above, a plurality of mobile stations,
A digital cordless telephone device comprising a base station wirelessly connected to the mobile station and a main unit or a PBX accommodating the plurality of base stations on the extension side has a plurality of compression encoding / decoding means. By providing a sub-rate communication control unit and capacity management means for managing an available channel and an available capacity of a wireless information channel subjected to the sub-rate communication control, the digital cordless telephone device can efficiently manage data in the digital cordless telephone device. It is possible to secure a transmission path.

[0024]

As is apparent from the above description, in the digital cordless telephone device to which the present invention is applied,
Compression encoding / decoding means corresponding to a plurality of systems for performing compression encoding and decoding of data, and a low-speed capacity equal to or less than an available capacity is allocated to a new call as long as physical sub-rate communication control is possible. Capacity management means for managing the free capacity, so that the data transmission rate between the mobile station and the base station is not determined from the beginning as a default value, but based on the status of the free channel and free capacity of the wireless information channel. Since the data transmission speed is dynamically set, the communication voice quality can be guaranteed as much as possible when the communication traffic is small.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a digital cordless telephone device according to the present invention.

FIG. 2 is a flowchart (part 1) for explaining the operation of the capacity management means of the digital cordless telephone device according to the present invention.

FIG. 3 is a flowchart (part 2) for explaining the operation of the capacity management means of the digital cordless telephone device according to the present invention.

FIG. 4 is a flowchart (part 3) for explaining the operation of the capacity management means of the digital cordless telephone device according to the present invention;

[Explanation of symbols]

1-1 to 1-n mobile station, 1a wireless transmission / reception unit, 1b ...
Subrate communication control unit, 2-1 to 2-2n base station, 2
a: wireless transmission / reception unit, 2b: sub-rate communication control unit, 3 ...
Main unit or PBX (Private Branch Exchange), 3a ...
Capacity management means.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 7/26 H04Q 7/00-7/38

Claims (1)

(57) [Claims] 1. A digital cordless telephone device comprising a plurality of mobile stations, a base station wirelessly connected to the plurality of mobile stations, and a main unit or PBX accommodating the plurality of base stations on the extension side. The radio information channel between the mobile station and the base station of the digital cordless telephone device is divided into a plurality of low-capacity calls lower than the predetermined data transmission rate by a plurality of compression encoding / decoding means. In a digital cordless telephone device capable of communication control, when a call connection is made due to a data transmission request, the presence or absence of a radio information channel to which sub-rate communication control is applied is checked, and sub-rate communication control is performed. If the applied wireless communication channel already exists, check the free space of the wireless information channel, and If there is no available capacity, the free capacity of any free wireless information channel is checked, and the capacity is subdivided until it becomes physically impossible. A digital cordless telephone device comprising a capacity management means for managing a capacity for allocating a capacity and efficiently securing a data transmission path.