JPH0984104A - Digital portable telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the measuring time of line quality and to reduce facilities in a radio base station by receiving voice data with one channel, turning back test data by the other channel and executing transmission/reception. SOLUTION: When a turn-back command from an exchange is supplied, a control part 39 operates a transmitting/receiving part 31 and a TDMA processing part 32 in a full-rate, operates a voice processing part 35 and a turn-back processing part 38 in a half-rate, permits a change-over part 33 to select the voice processing part 34 by the timing of a channel CH0 and also permits the turn-back processing part 38 to be selected by the timing of the channel CH3. Thus, a portable equipment turns back test data by the channel CH0 succeeding to the channel CH0 of voice data. Test data turned-back by the portable equipment is compared with test data transmitted by the radio base station so that line quality is measured and its measurement with high precision is executed in a short time because large quantity of test data is transmitted/received by one full-rate channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile phone system, and more particularly to a digital mobile phone system for transmitting / receiving digital voice data between a mobile device and a radio base station.

[0002]

2. Description of the Related Art In a digital portable telephone system, channel switching is performed and operation normality of a wireless base station is confirmed depending on the line quality in a wireless section. In the conventional system, the channel quality that triggers the channel switching is obtained by measuring the bit error rate of the fixed pattern part such as the synchronization word in the communication channel. Then, when the line quality becomes a certain value or less, the channel of the carrier having a high reception level is switched between the portable device and the wireless base station.

Further, in the conventional system, in order to confirm the normality of the wireless base station, a portable test device is installed in the wireless base station, and a communication channel is established between the wireless base station and the portable test device. , The call channel is folded back inside the test portable unit, and the test pattern is sent from the exchange to the call channel, and the folded test pattern is detected to evaluate the radio base station. .

[0004]

In the conventional system, the line quality is counted by the bit error rate of the fixed pattern portion such as the synchronization word in the communication channel, but the number of bits of the fixed pattern portion in the communication channel is counted. Since the number of bits is small, it takes a long time to measure the bit error rate with high accuracy, and there is a problem that the line switching is delayed.

Further, in the conventional system, a portable test device must be installed in the wireless base station just to confirm the normality of the wireless base station, which causes a problem that the installation equipment of the wireless base station increases. there were. The present invention has been made in view of the above points, and an object of the present invention is to provide a digital mobile phone system capable of shortening the line quality measurement time and reducing the equipment of a radio base station.

[0006]

According to a first aspect of the present invention, there is provided a digital portable telephone system for transmitting / receiving digital voice data between a portable unit and a radio base station, wherein the portable unit has a plurality of channels per frame. It has a dual rate function capable of both full-rate transmission / reception of voice data in two channels and half-rate transmission / reception of voice data in one channel of a plurality of channels per frame, and has a dual rate function. One of the channels transmits and receives audio data, and the other channel loops back and transmits test data.

Thus, the line quality can be measured by comparing the test data returned by the portable device with the test data transmitted by the radio base station, and a large amount of test data is transmitted / received by one full-rate channel, which results in high accuracy. The line quality of can be measured in a short time. According to a second aspect of the present invention, the switching center connected to the radio base station of the digital portable telephone system according to the first aspect transmits voice data to one of the two channels of full rate with the portable device. The line quality is measured by transmitting / receiving and transmitting / receiving the test data on the other channel, comparing the transmitted test data with the test data returned by the portable device.

Thus, the line quality can be measured by comparing the test data returned by the portable device with the test data transmitted by the radio base station, and a large amount of test data is transmitted / received by one full-rate channel, which results in high accuracy. The line quality of can be measured in a short time. According to a third aspect of the invention, in the digital portable telephone system according to the second aspect, the measured line quality value is used as a trigger for channel switching.

Therefore, the channel switching can be performed at high speed on the basis of the channel quality obtained in a short time, and it is possible to prevent the channel switching from being delayed with respect to the actual deterioration of the channel quality. According to a fourth aspect of the present invention, in the digital mobile phone system according to the second aspect, the normality of the radio base station is determined based on the measured line quality value.

Therefore, it is not necessary to install a portable device for testing in the radio base station, and the equipment in the radio base station can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a system configuration diagram of an embodiment of a digital mobile phone system. In the figure, a switching center (MSC) 10 is a transmission device 1 connected to a general public line.
2, a transmission device 14 connected to a transmission path 13 to a wireless base station, and a switching device 1 provided between the transmission devices 12 and 14.
5 and the base station control device (BC
E) 16 and.

The transmission device 14 of the exchange 10 is connected to a plurality of radio base stations (BTS) 20 by a transmission line 13. Each wireless base station 20 has a line terminating device (DSU) 21 connected to the transmission line 13, a wireless transceiver device (MDE) 22 connected to the DSU 21, and a wireless common amplifier device (C.AMP) connected to this. And 23.
And C.I. An antenna 24 is connected to the AMP 23, the wireless base station 20 and the portable device 30 are connected by a wireless line, and data transmission is performed by a TDMA (time division multiple access) method.

Here, the portable device 30 is a dual rate device that supports two types of data transfer rates, a full rate and a half rate. At full rate, as shown in FIG. 3 (A), two channels C out of 6 channels per frame are used.
H0 and CH3 are used as voice slots. On the other hand, at the half rate, as shown in FIG. 3B, one channel CH0 out of 6 channels per frame is used as a voice slot.

In addition to this, in the present invention, when measuring channel quality, as shown in FIG. 3 (C), one channel CH0 out of 6 channels per frame is used as a voice slot, and another channel CH3 is used. It returns as a test data slot. FIG. 1 shows a block diagram of an embodiment of a portable device of the present invention. In the figure, the transmission / reception unit 31 has a modem function and performs data transmission with the wireless base station 20 by wireless communication. The TDMA processing unit 32 is the transmitting / receiving unit 31.
The data of the channel assigned to the own terminal is extracted from the TDMA frame received in step S3 and supplied to the switching unit 33.
Also, the data supplied from the switching unit 33 is put into the channel assigned to the own terminal and supplied to the transmitting / receiving unit 31.
Further, a control command transmitted to the own terminal by the control channel is stored in the register 34 in the TDMA processing unit 32.

The voice processing unit 35 converts the data of the voice slot supplied from the switching unit 33 into an analog signal and outputs it to the speaker 3.
6 is sounded and the voice signal obtained by the microphone 37 is digitized and supplied to the switching unit 33 as a voice slot. The loopback processing unit 38 loops back the data supplied from the switching unit 33 as it is and supplies the data to the switching unit 33.

The control unit 39 controls the operation of the entire mobile unit, and controls the operations of the transmission / reception unit 31, the TDMA processing unit 32, the switching unit 33, etc. based on the control command stored in the register 34. Although the portable device 30 is a dual rate device, normally, one channel CH0 out of 6 channels per frame is used as a voice slot as shown in FIG. Send and receive rates. Here, when a loopback command is supplied from the switching center 10 through the control channel of the voice data 2 shown in FIG. 4A, the control unit 39 detects this loopback command, and the transmitting / receiving unit 31 and the TDMA processing unit 32 are detected. Is operated at full rate, the voice processing unit 35 and the loopback processing unit 38 are operated at half rate, the switching unit 33 is caused to select the voice processing unit 35 at the timing of channel CH0, and the loopback processing unit 38 is switched at the timing of channel CH3. Select.

As a result, the portable device 30 loops back the test data 1 on the channel CH0 following the channel CH0 of the voice data 2 shown in FIGS. 4 (A) and 4 (B). After this, portable device 3
As shown in FIGS. 5 (A) and 5 (B), 0 uses the channel CH0 as a voice slot and the channel CH3 as a slot for test data, and performs a half rate operation.

On the other hand, in the switching device 15 of the switching center 10, as shown in FIG. 6, a voice processing section 51 and an error rate measuring section 52 are connected to the time division switch 50. The time divisional switch 50 is connected to the transmission device 14 via a terminal 53, and the voice processing unit 51 is connected to the transmission device 12 via a terminal 54.

The time divisional switch 50 is normally shown in FIG.
As shown in (B) of transmission data and reception data, one channel CH0 out of 6 channels per frame is connected to the audio processing unit 51 to perform half rate transmission / reception. Here, by the control of BCE16 periodically or as needed,
The loopback command is sent to the control channel of the audio data 2 shown in FIG. 7A, and the test data is sent from the next channel CH3.

As a result, the time division switch 50 connects the channel CH0 to the voice processing unit 51 and connects the channel CH3 to the error rate measuring unit 52. Therefore, the subsequent transmission data and reception data are as shown in FIGS. 8 (A) and 8 (B). The voice processing unit 51 performs voice processing at a half rate, and the error rate measurement unit 52 performs bit comparison between the transmitted test data and the test data received by returning and performs line quality measurement.

Conventionally, since the line quality is measured by a fixed pattern portion such as a sync word, in the case of a transmission rate of 64 Kbits / sec, for example, the bit to be inspected which was only 20 bits in 40 msec at the half rate in the present invention. One channel (CH3) has 224 bits, and the measurement time is shortened to 1/10 of the conventional one.

Therefore, the channel switching can be performed at high speed based on the channel quality obtained in a short time, and the channel switching can be prevented from being delayed with respect to the actual deterioration of the channel quality. Further, it is not necessary to install a test portable device in the wireless base station 20, and it becomes possible to confirm the normality of the wireless base station 20 by the general portable device 30, and it is possible to reduce the equipment of the wireless base station. It will be possible.

[0023]

As described above, the invention according to claim 1 is
In a digital mobile phone system for transmitting / receiving digital voice data between a portable device and a wireless base station, the portable device has a full rate for transmitting / receiving voice data on two channels out of a plurality of channels per frame and a plurality of units for each frame. It has a dual-rate function that allows both half-rate communication that transmits and receives audio data on one of the channels, and transmits and receives audio data on one of the two full-rate channels and tests on the other channel. Data is returned and sent and received.

Thus, the line quality can be measured by comparing the test data returned by the portable device with the test data transmitted by the radio base station, and a large amount of test data is transmitted / received by one full-rate channel, which results in high accuracy. The line quality of can be measured in a short time. According to a second aspect of the present invention, the switching center connected to the radio base station of the digital portable telephone system according to the first aspect transmits voice data to one of the two channels of full rate with the portable device. The line quality is measured by transmitting / receiving and transmitting / receiving the test data on the other channel, comparing the transmitted test data with the test data returned by the portable device.

Thus, the line quality can be measured by comparing the test data returned by the portable device with the test data transmitted by the radio base station, and a large amount of test data is transmitted / received by one full-rate channel, which results in high accuracy. The line quality of can be measured in a short time. According to the invention of claim 3, in the digital mobile phone system of claim 2, the measured line quality value is used as a trigger for channel switching.

Therefore, the channel switching can be performed at high speed based on the channel quality obtained in a short time, and it is possible to prevent the channel switching from being delayed with respect to the actual deterioration of the channel quality. The invention described in claim 4 is the same as the invention described in claim 2.
In the digital mobile phone system described above, the normality of the wireless base station is determined based on the measured line quality value.

Therefore, it is not necessary to install a portable device for testing in the radio base station, and the equipment in the radio base station can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a portable device of the present invention.

FIG. 2 is a system configuration diagram of a digital mobile phone system of the present invention.

FIG. 3 is a diagram for explaining the present invention.

FIG. 4 is a diagram for explaining the operation of the portable device.

FIG. 5 is a diagram for explaining the operation of the portable device.

FIG. 6 is a block diagram of a main part of an exchange.

FIG. 7 is a diagram for explaining the operation of the exchange.

FIG. 8 is a diagram for explaining the operation of the exchange.

[Explanation of symbols]

 10 switching center 12, 14 transmission device 13 transmission path 15 switching device 16 base station control device 20 wireless base station 21 line termination device 22 wireless transmission / reception device 23 wireless common amplification device 24 antenna 30 portable device 31 transmission / reception unit 32 TDMA processing unit 33 switching Section 34 register 35, 51 voice processing section 38 loopback processing section 39 control section 50 time division switch 52 error rate measurement section

Claims (4)

[Claims] 1. A digital mobile phone system for transmitting / receiving digital voice data between a mobile device and a wireless base station, wherein the mobile device transmits / receives voice data on two channels out of a plurality of channels per frame, It has a dual rate function capable of both half-rate communication for transmitting and receiving voice data in one channel among a plurality of channels per frame, and transmitting and receiving voice data in one of the two channels of full rate, A digital mobile phone system characterized in that test data is returned and transmitted and received on the other channel. 2. The switching center connected to the radio base station of the digital mobile phone system according to claim 1, transmits / receives voice data to / from the mobile device through one of two full-rate channels, and the other. A digital mobile phone system characterized in that the line quality is measured by transmitting and receiving test data through the channel and comparing the sent test data with the test data returned by the portable device and received. 3. The digital mobile phone system according to claim 2, wherein the measured line quality value is used as a trigger for channel switching. 4. The digital mobile phone system according to claim 2, wherein the normality of the radio base station is judged based on the measured line quality value.