JPH1051375A - Utilizing system for coding/decoding converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize effectively the coding/decoding converter even when a signal of the half rate voice coding system and a signal of the full rate voice coding system are sent in mixture with respect to the utilizing method of the coding/decoding converter for an exchange side in digital mobile communication. SOLUTION: A coding/decoding converter 7 is provided with devices having provision for any signal processing of signals of the half rate voice coding system and of the full rate voice coding system by a number of lines to be processed when all channels of a radio base station 1 adopt the half rate voice coding system. With respect to the channel signal of the half rate voice coding system, an opposite device processes the half rate voice coding system, and with respect to the signal of the full rate voice coding system in two channels of the same time slot in the case of the half rate voice coding system, the full rate voice coding system is used to process the signal by a device opposed to one of the two channels and the device opposed to the other of the two channels is not in use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for using a codec conversion device on the exchange side in digital mobile communication.

In a digital mobile radio communication network, a dedicated line or a general public line connecting a radio base station and an exchange is multiplexed by a plurality of channels for each time slot to transmit a coded voice signal. In the exchange, this is converted into a digital highway consisting of a plurality of time slots by a codec conversion device and transmitted.

[0003] At this time, even if a signal of the half-rate speech coding system and a signal of the full-rate speech coding system are mixedly transmitted on a dedicated line or a general public line connecting the radio base station and the switching center. It is necessary to make it possible to effectively use the codec conversion apparatus.

[0004]

2. Description of the Related Art In a mobile communication network, a personal computer (PC) is used to effectively use a dedicated line or a general public line connecting a radio base station (BS) side and a switching center (DSM) side.
Digital highway consisting of M24 and PCM30
In the time-division multiplexed time slot, VSEL
According to a special speech codec conversion scheme such as P coding scheme or PSI-CELP coding scheme, for example, 6
A method of multiplexing the data into channels or 12 channels and transmitting the data is adopted.

On the exchange side, the channel multiplexed by this special codec conversion system is converted by a codec converter into a PCM which is a digital transmission system on the exchange center.
The communication is performed by converting the code into a code and transmitting the code to another general exchange.

At this time, as a multiplexing method in a time slot between the radio base station and the exchange, there are a full-rate voice coding method in which transmission is performed at a period of 20 ms by the VSELP coding method, and a multiplexing method at a time period of 40 ms by the PSI-CELP coding method. There is a half-rate audio coding system to be transmitted, and the audio signal is transmitted by any one of these encoding systems.

FIG. 1 shows an example of a system configuration in a mobile communication network. The radio base station 1 includes a plurality of transceiver unit (TRX) 2 ₁ has a to 2 _n, the radio section (Um point) between the mobile 3, 11.2kbps VSEL
P system 3ch multiplex TDMA system Full rate voice coding system, or 5.6 kbps PSI-CELP system 6ch multiplex TDMA system Communication is performed by half rate voice coding system, and these signals are collected by the concentrator 4 to be used as a dedicated line or An exchange (local exchange) 6 is connected by a general public line 5. In the exchange 6, these signals are converted by the codec conversion device 7 into PCs.
The signal is converted into a digital highway signal such as M24 or PCM30 and connected to a digital exchange (not shown).

Conventionally, a signal of a dedicated line or a general public line connecting the radio base station side and the exchange side is a full rate speech coding system, and the assignment of channels and devices is as follows.
It was done 1: 1.

[0009]

In a dedicated line or a general public line connecting the radio base station side and the exchange side, a signal of a half rate speech coding system and a signal of a full rate speech coding system are mixed. When it is transmitted
The arrangement of the codec in the exchange and its effective use poses a problem.

[0010] In this case, in the switching center, depending on the signal to be transmitted, whether a codec / conversion device corresponding to a half-rate speech coding system and a codec / conversion device corresponding to a full-rate speech coding system are provided. , Or a codec that can cope with both the half-rate speech coding method and the full-rate speech coding method will be arranged. In such a case, a method that effectively uses the codec conversion apparatus Was not previously known.

An object of the present invention is to solve such a problem of the prior art. In a mobile communication network, a dedicated line connecting a radio base station side and an exchange side or a general public line has a half line. It is an object of the present invention to provide a system that can effectively use a codec conversion apparatus when a signal of a rate speech coding system and a signal of a full rate speech coding system are mixedly transmitted.

[0012]

In the present invention, the following method is used as specific means for solving the problem.

(1) In an exchange 6 connected to the radio base station 1 by a dedicated line or a general public line 5, an encoded voice signal composed of a plurality of channels for each time slot in the dedicated line or the general public line 5 is transmitted. In a mobile communication network for converting to a digital highway of a plurality of time slots via the codec 7, the codec 7 supports both half-rate speech coding and full-rate speech coding. A possible device is provided for a line for processing when all the channels on the side of the radio base station 1 are of the half-rate speech coding system, and a device facing the channel for a signal of the channel of the half-rate speech coding system is provided. Performs the processing of the half-rate speech coding method at the same time slot in the half-rate speech coding method. For the signal of the full-rate speech coding system in the two channels, the device facing the one of the two channels performs the processing of the full-rate speech coding system, and the device facing the other of the two channels is processed. Not used.

(2) In an exchange 6 connected to the radio base station 1 by a dedicated line or a general public line 5, an encoded voice signal composed of a plurality of channels for each time slot in the dedicated line or the general public line 5 is transmitted. In a mobile communication network for converting to a digital highway of a plurality of time slots via the codec 7, the codec 7 supports both half-rate speech coding and full-rate speech coding. A possible device is provided for a line for processing when all the channels on the side of the radio base station 1 are of the half-rate speech coding system, and a device facing the channel for a signal of the channel of the half-rate speech coding system is provided. Performs the processing of the half-rate speech coding method at the same time slot in the half-rate speech coding method. For the signal of the full-rate speech coding system in the two channels, the device facing the one of the two channels performs the processing of the full-rate speech coding system, and in the device facing the other of the two channels, , Process signals of a half-rate speech coding channel or a full-rate speech coding channel of another time slot.

(3) In an exchange 6 connected to the radio base station 1 by a dedicated line or a general public line 5, an encoded voice signal composed of a plurality of channels for each time slot in the dedicated line or the general public line 5 is transmitted. In a mobile communication network for converting to a digital highway of a plurality of time slots via the codec 7, the codec 7 is provided with a half-rate speech coding system 12 for performing half-rate speech coding. Full-rate speech coding system device 1 for processing full-rate speech coding
3 and a switching unit 1 for switching inputs to both devices
1 is provided for the required lines according to the respective traffics, and switching is performed by the switching unit 11 in accordance with the identification signal indicating the channel of the half-rate speech coding system or the channel of the full-rate speech coding system. The processing of the encoding method of each channel is performed.

(4) In an exchange 6 connected to the radio base station 1 by a dedicated line or a general public line 5, an encoded voice signal composed of a plurality of channels for each time slot in the dedicated line or the general public line 5 is transmitted. In a mobile communication network for converting to a digital highway of a plurality of time slots via the codec / conversion device 7, the codec / conversion device 7 is provided with either half-rate speech coding or full-rate speech coding. The codec / converter 14 which can also be set by switching is provided for the necessary lines according to the traffic, and the codec / coder / converter 14 of the codec / converter 14 is set in accordance with the identification signal indicating the channel of the half-rate voice coding system or the channel of the full-rate voice coding system. By switching and setting the processing method, the processing of the coding method for each channel can be performed. Do.

According to the system of the present invention, when a signal of the half-rate speech coding system and a signal of the full-rate speech coding system are mixed, the combination of the line and the device is changed to the state of the exchange. By optimizing according to this, it is possible to effectively use the line and the codec conversion apparatus.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS For example, a codec / decoder / converter has 12
When the switching station has a capacity capable of performing processing for 0 channels, the time slot available on the exchange side is 12
Although the time slot is 0, the radio base station side further multiplexes each time slot. Therefore, when multiplexing 6 channels, use 20 time slots and when multiplexing 12 channels, use only 10 time slots. become.

In the embodiment (1) of the present invention, the assignment of the time slot on the exchange side to the codec conversion apparatus is 1: 1, and the radio base station side transmits all the channels by the half-rate voice coding system. In this case, channels and devices are allocated so that all devices are in use. Therefore, in the case of a codec conversion device having a capacity of 120 channels, the radio base station uses 10 (time slots) × 12 (channels).

In the present embodiment, a well-known device capable of coping with both half-rate speech coding and full-rate speech coding is used as a codec. These codec units usually operate according to the half-rate speech coding system, and when two channels are used for signals of the full-rate speech coding system, they are assigned to one of the channels. The codec is operated by the full-rate speech coding system, and the codec that is opposed to the other channel is not used.

FIG. 2 shows an embodiment (1) of the present invention.
FIG. 6 shows the relationship between the assignment of the radio base station side channel, the codec / conversion device, and the exchange side time slot.

[0022] As shown, in the time slot TS _n with the radio base station (BS) side, the half-rate speech coding, the channels 1 to 12 40 m
In the case where allocation is performed at intervals of s, when all the channels are operating according to the half-rate speech coding scheme, the codec / decoder is configured such that the device 1 to the device 12
In addition, on the exchange (DSM) side, devices 1 to 12 are assigned time slots TSa to TS
l.

FIG. 3 shows the relationship between the channel of the radio base station and the assignment of the codec / conversion device when signals of the full-rate speech coding system are mixed in the embodiment (1).

The signal of the full rate speech coding system is 20
Since the channels are allocated at intervals of ms, when the channels 2 and 4 on the BS side are full-rate speech coding, the eighth channel is allocated to the channel 2 and the tenth channel is allocated to the channel 4 as shown in the figure. Can be In this case, the device 8 and the device 10 are not used on the side of the codec conversion device.

The method of the embodiment (1) is characterized in that the channel on the radio base station side and each device on the codec / conversion device side are assigned 1: 1 so that setting of network station conditions and the like becomes easy. is there.

In the embodiment (2) of the present invention, similar to the embodiment (1), the arrangement of each channel on the BS side, each device of the codec / transformer, and each time slot on the DSM side is described. In the above, an apparatus capable of coping with both the half-rate speech coding method and the full-rate speech coding method is used as a codec conversion apparatus.

[0027] These codec units usually operate according to the half-rate speech coding system. When a signal of the full-rate speech coding system uses two channels, it is assigned to one of the channels. Is operated by the full-rate speech coding method, but the codec conversion device facing the other channel is assigned to a channel of another time slot.

FIG. 4 shows an embodiment (2) of the present invention.
FIG. 6 shows the relationship between the assignment of the radio base station side channel, the codec / conversion device, and the exchange side time slot.

[0029] As shown, in the time slot TS _n with the radio base station (BS) side, the half-rate speech coding, the channels 1 to 12 40 m
In the case where allocation is performed at intervals of s, the allocation relationship between each channel on the BS side and each device on the codec conversion device side, and the codec The assignment relationship between each device and each time slot on the DSM side is the same as in the case of the embodiment (1).

FIG. 5 shows the relationship between the channel of the radio base station and the assignment of the codec / conversion device when signals of the full-rate speech coding system are mixed in the embodiment (2).

When channels 2 and 4 on the BS side are of the full-rate speech coding system, the eighth channel is assigned to channel 2 and the tenth channel is assigned to channel 4 as shown. In this case, in the code decoded transform apparatus, a device 8 and the apparatus 10, for example of another time slot TS _m, channels 2 and 4
Used by The signals processed by the devices 8 and 10 may be in half-rate speech coding or in full-rate speech coding.

According to the system of the embodiment (2), even if signals of the full-rate speech coding system are mixed, there is no longer any device that cannot be used in the codec conversion device. At this time, in the case of an encoding / decoding conversion device for 120 channels, the radio base station uses 20 time slots, and when all the channels are half-rate speech encoding, 10 time slots are used.
When only the time slots are used and the full-rate speech coding system is mixed, the remaining 10 time slots are allocated to the opposing device in the codec. Therefore, in the case of the present embodiment, the channels processed by the codec are partially different between the case of the half-rate speech coding system and the case of the full-rate speech coding system.

In the embodiment (3) of the present invention, the DSM
The relationship between each time slot on the BS side, each channel on the BS side, and each device of the codec / decoder is expanded, so that the device of the half-rate speech coding system and the device of the full-rate speech coding system are divided. In accordance with the coding method of the input signal, a signal of the half-rate voice coding method is allocated to a device of the half-rate voice coding method, and a signal of the full-rate voice coding method is allocated according to the coding method of the input signal. Should be assigned to the device of the chemical method. This switching is performed by the switching unit using an identification signal indicating the full-rate audio coding method and the half-rate audio coding method.

FIG. 6 shows an example of a circuit configuration in the embodiment (3). As shown, the switching unit 11
When the input signal from the BS is a signal of the half-rate speech coding system according to a half-rate / full-rate discriminating signal from an exchange (not shown), In the case of an encoding signal, the signal is assigned to the full-rate speech encoding device 13.

FIG. 7 illustrates a highway switching method in the embodiment (3). In the case of the embodiment (3), the relationship between the channel and the codec is not determined, and the signal of the half-rate coding method and the signal of the full-rate coding method are mixed and transmitted on the public line. come.

The switching unit 11 replaces the multiplexed channel in the time slot with a half-rate encoding highway and a full-rate encoding highway. Are connected to the converter at 1: 1 with respect to the time slot without being multiplexed.

That is, from the highway in which the signal of the half-rate encoding system and the signal of the full-rate encoding system are mixedly transmitted by the switching unit 11, the half-rate encoding system and the full-rate encoding system are determined by the identification signal. Are extracted and sent to the respective codec units without multiplexing, so that the codec unit only needs to prepare a necessary number according to the traffic.

According to the embodiment (3), each device in the codec can be installed according to the relationship with the traffic, and the device can be used effectively.

In the embodiment (4) of the present invention, as in the case of the embodiment (3), the relationship between each time slot on the DSM side, each channel on the BS side, and each apparatus of the codec conversion apparatus is described. Scalability, but make the device compatible with both half-rate speech coding and full-rate speech coding, and use the full-rate speech coding and half-rate speech coding from the exchange. The operation is performed in any one of the methods according to the identification signal indicating the above.

Thus, the channel from the BS side is
If the signal is a half-rate speech coding system, it is assigned to the first available device, and the half-rate speech coding system is processed according to the identification signal from the exchange, and the full-rate speech coding system is performed. Are mixed and input to the next available device, and the full-rate speech coding process is performed according to the identification signal from the exchange.

FIG. 8 shows an example of a circuit configuration in the embodiment (4). As shown in the figure, the codec converter 14 converts an input signal from the BS side input via the switching unit 11 according to a half-rate / full-rate identification signal from an exchange (not shown) into a half-rate speech encoding system. In the case of a signal, processing of a half-rate audio coding method is performed, and in the case of a signal of a full-rate audio coding method, processing of a full-rate audio coding method is performed.

FIG. 9 illustrates a highway switching method in the embodiment (4). In the case of the embodiment (4), in the embodiment (3), the half-rate code decoding / conversion device and the full-rate code decoding / conversion device can be realized by one device, and the signal of the half-rate speech coding method is used. In order to cope with either the half-rate audio coding method or the full-rate audio coding method, the signals of the full-rate audio coding method are mixedly transmitted on the highway and transmitted to a codec / conversion device via a separate line. To

According to the embodiment (4), according to the speech coding system of the input channel, the speech coding system is freely switched by the identification signal from the exchange, and the processing is performed. And the device can be more effectively used.

[0044]

As described above, according to the present invention, a signal of each channel of a dedicated line or a general public line on a radio base station side of a mobile communication network is converted into a time slot of a digital highway on a switching center side. In a coding / decoding / converting apparatus, even when a signal of a full-rate speech coding scheme and a signal of a half-rate speech coding scheme are mixed in a signal of each channel on the wireless base station side, even if a signal of a half-rate speech coding scheme is mixed, Can be optimized according to the state of the exchange, so that the line and the codec conversion device can be effectively used.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a system configuration in a mobile communication network.

FIG. 2 is a diagram showing a relationship between a channel of a radio base station, an assignment of a codec / decoder, and a time slot of an exchange in an embodiment (1) of the present invention.

FIG. 3 is a diagram illustrating a relationship between assignment of a radio base station side channel and a codec in a case where signals of a full-rate speech coding scheme are mixed in the embodiment (1).

FIG. 4 is a diagram illustrating a relationship between a channel of a wireless base station, an allocation of a codec / decoder, and a time slot of an exchange in an embodiment (2) of the present invention.

FIG. 5 is a diagram illustrating a relationship between assignment of a channel of a radio base station and a codec in a case where signals of a full-rate speech coding scheme are mixed in the embodiment (2).

FIG. 6 is a diagram illustrating an example of a circuit configuration according to an embodiment (3).

FIG. 7 is a diagram illustrating a highway switching method according to the embodiment (3).

FIG. 8 is a diagram illustrating an example of a circuit configuration according to an embodiment (4).

FIG. 9 is a diagram illustrating a highway switching method in the embodiment (4).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio base station 5 Dedicated line or general public line 6 Exchange 7 Codec / decoding / conversion device 11 Switching unit 12 Half-rate speech coding system 13 Full-rate speech coding system 14 Codec / conversion device

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Aya Kawasaki 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Hiroki Asanuma 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Inside Fujitsu Limited

Claims (4)

[Claims] An exchange connected to a radio base station by a dedicated line or a general public line converts a coded voice signal composed of a plurality of channels for each time slot of the dedicated line or the general public line into a codec-decoded signal. In a mobile communication network for converting to a digital highway of a plurality of time slots via a device, the codec conversion device, a device capable of supporting both processing of a half-rate speech coding system and a full-rate speech coding system, A line is provided for processing when all channels on the radio base station side are of the half-rate speech coding system. For a signal of a channel of the half-rate speech coding system, a half-rate speech code is transmitted to a device facing the channel. Of the same time slot for half-rate speech coding For a signal of the full-rate speech coding method in the channel, the processing of the full-rate speech coding method is performed in the device facing one of the two channels, and the device facing the other of the two channels is not used. A method of using a codec-decoding conversion device, characterized in that: 2. An exchange connected to a radio base station by a dedicated line or a general public line, converts a coded voice signal composed of a plurality of channels for each time slot of the dedicated line or the general public line into a codec-decoded signal. In a mobile communication network for converting to a digital highway of a plurality of time slots via a device, the codec / conversion device 7 is provided with a device capable of coping with both processes of a half-rate voice coding system and a full-rate voice coding system. A line for processing when all the channels on the radio base station side are of the half-rate speech coding system; and for a signal of a channel of the half-rate speech coding system, a half-rate speech is transmitted by a device opposed to the channel. In addition to the processing of the encoding method, the same time slot 2 in the case of the half-rate speech encoding method is used. For the signal of the full-rate speech coding method in the channel of the two channels, the device facing the one of the two channels performs the processing of the full-rate speech coding method, and the device facing the other of the two channels performs Characterized in that it processes a signal of a half-rate audio coding system channel or a full-rate audio coding system channel of the time slot of (1). 3. An exchange connected to a radio base station by a dedicated line or a general public line, converts a coded voice signal composed of a plurality of channels for each time slot in the dedicated line or the general public line into a codec-decoded signal. In a mobile communication network for converting into a digital highway of a plurality of time slots via a device, the codec / decoder / converter includes a half-rate voice coding system for performing a half-rate voice coding process and a full-rate voice coding system. A set of a full-rate speech coding system device that performs processing and a switching unit that switches an input to both devices is provided for a required line according to traffic, and a half-rate speech coding channel or a full-rate speech coding channel is provided. Switching in the switching unit according to the identification signal shown in FIG. It allows utilization scheme of code decoding conversion device and performs the processing of coding scheme for each channel. 4. An exchange connected to a radio base station by a leased line or a public line, converts a coded voice signal composed of a plurality of channels for each time slot in the leased line or the public line into a codec. In a mobile communication network for converting to a digital highway with a plurality of time slots via a device, the codec / decoder can be switched and set for any processing of a half-rate voice coding method and a full-rate voice coding method. The necessary decoding and conversion equipment is provided for the required number of lines according to the traffic, and the processing method of the coding and decoding conversion equipment is switched and set according to the identification signal indicating the channel of the half-rate speech coding scheme or the channel of the full-rate speech coding scheme. In this way, the processing of the coding method for each channel is Use method of the code decoding converter according to.