JP3336828B2 - Digital mobile radio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile radio system comprising an exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station. The present invention relates to a digital mobile radio system in which a mobile station, a base station, and a switch are configured so that maintenance and control information transmission can be flexibly handled by agreement between terminals.

[0002]

2. Description of the Related Art A conventional digital mobile radio system will be described with reference to FIGS.

FIG. 7 is a schematic configuration diagram showing the entire digital mobile radio system, and FIG. 8 is a block diagram showing the internal configuration of a base station and an exchange. In FIG. 7 and FIG. 2, 4 are digital mobile radio base stations, 3 is an exchange, and 6 is an exchange network.

The base stations 2 and 4 are provided with a transmission error / frame type detection unit 23 for detecting error information and a frame type with respect to the frame information transmitted from the mobile units 1 and 5 to the base stations 2 and 4, A maintenance information notifying unit 24 for multiplexing the information detected by the frame type detecting unit 23 together with the received frame data as maintenance information K, a frame converting unit 22 for converting a format of a frame to be transmitted, and a call connection based on the call connection information. And a call connection control unit 21 that controls the

[0005] The exchange 3 also monitors the maintenance information sent from the base stations 2 and 4 and converts a voice ADPCM code into a 64 kb / s PCM code such as μ-law. PCM converter 33 with function
And a correction control unit 34 that performs control / correction according to the content of the maintenance information detected by the maintenance information monitoring unit 32.

Next, the operation of the conventional example will be described with reference to FIGS. The voice information and other data information S1 converted into an ADPCM code or the like in the mobile device 1 are four-multiplexed in time slots T1 to T4, and a unique word (UW) for detecting frame synchronization, a frame type (CI), and error information ( It is wirelessly transmitted to the base station 2 together with the CRC) information S11. In the base station 2, the information of T1 to T4 is frame-converted into B1 to B4 by the frame conversion unit 21, and information (UW, CI, CRC) such as synchronization and frame type detected by the transmission error / frame type detection unit 23. Are multiplexed as maintenance information K by the maintenance information notifying unit 24, and the call control information D is multiplexed and transmitted to the exchange 3. That is, the base station 2 multiplexes the frame type (CI) shown in S31 as maintenance information K together with the voice / data information received from the mobile device 1 and transmits the multiplexed data to the exchange 3.

[0007] The maintenance information monitoring section 32 of the exchange 3 monitors the maintenance information K included in the received signal, and transmits control information corresponding to the information content to the correction control section 34 or the PCM conversion section 33. Upon receiving the control information, the correction control unit 34 performs silence control, background noise control that does not cause a sense of incongruity on the receiving side, and voice control for performing a talkie service on an error frame. In the case of data communication, the PCM conversion unit 33 that has received the control information performs non-data conversion control for data communication, and performs speed conversion control and error detection / correction control in the correction control unit 34.

As described above, even in the conventional digital mobile radio system, when a transmission error occurs in the radio data transmitted from the mobile device 1 to the base station 2, the base station 2
The transmission error is detected, and the error information is transmitted to the exchange 3 in real time by the maintenance information bit K.
Then, according to the content of the maintenance information K, in addition to controlling and correcting the voice, non-conversion control, speed conversion control, and error detection / correction control for data communication can be realized.

[0009]

However, in the above-described conventional mobile radio system, error information and maintenance information transmitted from the mobile unit are notified only to the exchange, so that voice control and data communication control are all performed by the exchange. It is necessary to perform control and conversion according to the maintenance information notified from the transmission side according to the reception side mobile station, and flexible by agreement between mobile stations such as data communication such as transmitting data during silence during voice communication There was a problem that it was not possible to provide a simple service.

[0010] The present invention is to solve such a conventional problem. A mobile station, a base station, and an exchange are provided so that maintenance and control information transmission between mobile stations can be flexibly handled by agreement between terminals. It is an object of the present invention to provide a digital mobile radio system configured as described above.

[0011]

To achieve the above object, the present invention comprises an exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station. A digital mobile radio system that performs digital communication between the base station and the mobile station, and between the switch and each base station, wherein the base station detects a reception frame type and the like detecting an uplink reception frame type and the like, Means for multiplexing the frame maintenance information together with the received frame when a received frame type or the like is detected and transmitting the multiplexed frame maintenance information to the exchange, and detecting maintenance information from a downstream frame from the exchange, and using the maintenance information as a radio frame type or the like Means for multiplexing and notifying to the mobile station, wherein the exchange uses maintenance information received from the base station in an information channel of a PCM highway provided in the exchange. Bit multiplexing means, and means for separating the maintenance information from the PCM highway, and receiving an information channel and multiplexing the information channel to the base station. In addition to silence control and VOX control in accordance with the type of radio frame indicating information, background noise control that does not give the receiver a sense of incompatibility, control means for non-conversion control for data communication, error detection / correction control, and the like are provided. Things.

As a result, a digital mobile radio system comprising mobile units, base stations, and exchanges can be provided so that maintenance and control information transmission between mobile units can be flexibly handled by agreement between terminals.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
An exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station. Digital communication is performed between the base station and the mobile station, and between the exchange and each base station. In the digital mobile radio system, the base station includes a reception frame type detection unit that detects an uplink reception frame type and the like, and multiplexes the frame maintenance information together with a reception frame when the reception frame type and the like are detected. A means for transmitting to the exchange, and a means for detecting maintenance information from a downstream frame from the exchange, multiplexing the maintenance information as a radio frame type or the like, and notifying the mobile equipment of the maintenance information, the exchange comprising the base station Means for multiplexing the maintenance information received from the PCM into unused bits of the information channel of the PCM highway provided in the exchange, and the maintenance information from the PCM highway Means for separating and receiving an information channel and multiplexing the received information to the base station, wherein the mobile station performs silence control or VOX control according to a radio frame type indicating maintenance information notified from the base station; In addition to the background noise control that does not give a sense of discomfort to the mobile communication system, the mobile communication system includes control means for performing no-conversion control for data communication, error detection / correction control, and the like. Maintenance information transmission to the other party's base station and the mobile device through data communication such as data transmission during silence during voice communication, voice control such as silence control, background noise control, or wireless communication for data communication. This has an effect that a flexible service can be obtained by agreement between mobile stations that performs conversion control, speed conversion control, error detection / correction control, and the like.

According to a second aspect of the present invention, there is provided an exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station, between the base station and the mobile station, and A digital mobile radio system that performs digital communication between an exchange and each base station, wherein the base station detects a reception frame type and the like that detects an uplink reception frame type and the like, and detects when the reception frame type and the like are detected. Means for multiplexing the frame maintenance information together with the received frame and transmitting the multiplexed frame maintenance information to the exchange, detecting the maintenance information from the downstream frame from the exchange, multiplexing the maintenance information as a radio frame type or the like, and notifying the mobile equipment. Means, the exchange comprising: an exchange-controlled PCM highway and a synchronous control bus synchronized therewith; an information channel on the PCM highway; Means for simultaneously multiplexing the maintenance information on the control bus, and means for simultaneously separating the information channel and the maintenance information from the PCM highway and the synchronization control bus, and multiplexing the information to the base station. In addition to silence control and VOX control according to the radio frame type indicating the maintenance information notified from the station, background noise control that does not give the receiver a sense of discomfort, non-conversion control for data communication,
It is equipped with control means for performing error detection / correction control, etc., and performs voice communication during mobile communication by transmitting maintenance information from each mobile station and base station of the mobile radio system to the other base station and mobile station via the exchange. Between mobile devices that perform data communication such as transmitting data when there is no sound, voice control such as silence control, background noise control, or non-conversion control, speed conversion control, error detection / correction control, etc. for data communication. This has the effect that flexible services can be obtained by agreement.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a schematic block diagram showing an overall configuration of a digital mobile radio system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing internal configurations of a mobile station, a base station, and a switch. .

1 and 2, reference numerals 11 and 15 denote mobile terminals, reference numerals 12 and 14 denote digital mobile radio base stations, reference numeral 13 denotes an exchange, and reference numeral 16 denotes an exchange network.

The mobile units 11 and 15 include a frame conversion unit 11
1 and the base stations 12, 1 obtained by the frame conversion unit 111.
A control unit that performs silence control and VOX control based on downlink maintenance information from the radio frame from No. 4, background noise control that does not cause a sense of discomfort to the receiver, non-conversion control for data communication, error detection / correction control, etc. 112.

The base stations 12 and 14 respectively include a transmission error / frame type detection unit 123 for detecting error information and a frame type with respect to the frame information transmitted from the mobile units 11 and 15 to the base stations 12 and 14, Uplink maintenance information notifying section 124 for multiplexing information detected by frame type detecting section 123 together with received frame data as maintenance information K.
An upstream frame conversion unit 122 for converting a format of a frame to be transmitted, a call connection control unit 121 for controlling a call connection based on call connection information, and a PC from the exchange 13.
A downlink frame conversion unit 125 that converts M data into a radio frame; and a downlink maintenance information monitor that detects maintenance information from the exchange 13 and notifies the mobile device of the maintenance information as a radio frame type or the like to the downlink frame conversion unit 125. Part 12
6 is provided.

The exchange 13 also includes an up maintenance information monitoring unit 132 for monitoring and detecting maintenance information sent from the base stations 12 and 14, and a voice ADPCM code of μ-La.
an up-PCM conversion unit 133 having a function of converting the PCM code into 64 kb / s PCM code such as w, or a function of keeping the conversion without conversion; an information control unit 134 for multiplexing the compressed PCM information and maintenance information; A PCM highway 138 that forms a communication path, an exchange control unit 135 that exchanges and transmits the PCM highway 138 while multiplexing the PCM data and maintenance information, and converts the PCM data extracted from the PCM highway 138 into an audio ADPCM code. And a downlink maintenance information notifying unit 137 for notifying the base stations 12 and 14 of maintenance information extracted from the PCM highway 138.

Next, the operation of the first embodiment configured as described above will be described. ADP in mobile device 11
The voice information and other data information S1 converted into a CM code or the like are multiplexed into four timeslots T1 to T4, and information such as a unique word (UW) for detecting frame synchronization, a frame type (CI), and error information (CRC). It is wirelessly transmitted to the base station 12 together with S11. In the base station 12, T
The information of 1 to T4 is raised by the frame conversion unit 121 to B1 to T4.
In addition to the frame conversion to B4, the information (UW, CI, CRC) such as the synchronization and frame type detected by the transmission error / frame type detection unit 123 is raised and the maintenance information notification unit 1
At 24, the information is multiplexed as maintenance information K, and further, the call control information D is multiplexed and transmitted to the exchange 13. That is, the base station 2 multiplexes the frame type and the like as the maintenance information K into the voice / data information together with the voice / data information received from the mobile device 1 as the maintenance information K and transmits the multiplexed voice / data information to the exchange 13 as shown in S3. Exchange 1
The third maintenance information monitoring unit 132 monitors the maintenance information K included in the received signal, and transmits the maintenance information to the information control unit 1.
34. The information control unit 134 that has received the maintenance information multiplexes the maintenance information with the compressed PCM data and the bits that are unused by the compression, and transmits the multiplexed information to the PCM highway 138. Further, the exchange control unit 135 is configured as shown in FIG.
As shown in the example of the PCM highway format shown in (1), exchange control is performed while the compressed PCM data and maintenance information are multiplexed on the information channel.

The other base station 14 and mobile station 15
Maintenance information notification unit 137 to which the information channel is connected
Receives the maintenance information multiplexed with the unused bits of the information channel from the receiving PCM highway 138, and the downlink PCM conversion unit 136 receives only the PCM data of the information channel and multiplexes it to the base station 12.

The downlink maintenance information monitoring unit 126 of the base station 12 detects maintenance information from the downlink frame from the exchange 13 and notifies the maintenance information to the mobile unit to the downlink frame conversion unit 125 as a radio frame type and the like. The mobile station 15 is multiplexed with the radio frame converted by the downlink frame conversion unit 125 and notified.

The frame conversion section 111 of the mobile station 15 notifies the control section 112 of downlink maintenance information notified from the radio frame received from the base station. Based on this information, the control unit 112 performs non-conversion control for data communication, error detection / correction control, and the like, in addition to silence control and VOX control, background noise control that does not give a discomfort to the receiver.

According to the first embodiment, the maintenance information is transmitted from each mobile station and base station of the mobile radio system to the other base station and mobile station via the exchange, so that silence during voice communication is achieved. Providing flexible services based on agreements between mobile units that perform data communication such as data transmission, silence control, background noise control, or non-conversion control, speed conversion control, error detection / correction control, etc. during data communication it can.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS.

FIG. 4 is a schematic block diagram showing an overall configuration of a digital mobile radio system according to Embodiment 2 of the present invention, and FIG. 5 is a block diagram showing internal configurations of a mobile station, a base station, and a switch.

In FIGS. 4 and 5, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description of the components will be omitted, and portions different from those in FIGS. 1 and 2 will be mainly described.

The second embodiment differs from the first embodiment in that the exchange 13 has a PCM highway 1
38, a synchronization control bus 139, and the PCM highway 138 and the synchronization control bus 139
5, the PCM data of the upstream PCM conversion unit 133 is transmitted to the PCM highway 138, and the maintenance information detected by the upstream maintenance information monitoring unit 135 is transmitted to the synchronous control bus 139. , The downstream PCM conversion unit 136 is a PCM highway 138.
The downlink maintenance information notification unit 137 is connected to the synchronization control bus 139.

The operation of the second embodiment configured as described above will be described. As in the case of the first embodiment, the voice information and other data information S1 converted into the ADPCM code or the like in the mobile device 11 are stored in the time slot T.
4 are multiplexed into 1 to T4, and wirelessly transmitted to the base station 12 together with a unique word (UW) for detecting frame synchronization, information S11 of a frame type (CI) and error information (CRC). In the base station 12, the information of T1 to T4 is frame-converted into B1 to B4 by the up frame conversion unit 121, and information (UW, CI, CR, etc.) detected by the transmission error / frame type detection unit 123 such as synchronization and frame type.
C) is multiplexed by the maintenance information notification unit 124 as maintenance information K, and further, the call control information D is multiplexed and transmitted to the exchange 13. That is, the base station 2 multiplexes the frame type and the like as the maintenance information K into the voice / data information together with the voice / data information received from the mobile device 1 as shown in S3 and transmits the multiplexed voice / data information to the exchange 13.

Upward maintenance information monitoring section 132 of exchange 13
Monitors the maintenance information K included in the received signal, and transmits the maintenance information to the synchronization control bus 139. The PCM data converted by the upstream PCM conversion unit 133 or the unconverted PCM data is transmitted to the PCM highway 13.
8 is sent.

Further, the exchange control unit 135 operates as shown in FIG.
As in the CM / maintenance information format example, exchange control is performed so that PCM data and maintenance information are transmitted to the same terminal in the same phase. Further, the base station 14 and the mobile station 15
Maintenance information notification unit 137 to which the information channel is connected
Receives the maintenance information from the synchronous control bus 139, and
The CM conversion unit 136 converts the PCM from the PCM highway 138 to the PCM.
Only the data is received and multiplexed to the base station 12.

Then, the downlink maintenance information monitoring unit 126 of the base station 12 detects maintenance information from the downlink frame from the exchange 13 and notifies the maintenance information to the mobile unit to the downlink frame conversion unit 125 as a radio frame type or the like. Then, the mobile station 15 is multiplexed with the radio frame converted by the downlink frame conversion unit 125 and notified to the mobile device 15.

The frame conversion section 111 of the mobile station 15 notifies the control section 112 of the downlink maintenance information notified from the radio frame received from the base station. Based on this information, the control unit 112 performs non-conversion control for data communication, error detection / correction control, and the like, in addition to silence control and VOX control, background noise control that does not give a discomfort to the receiver.

According to the second embodiment, the maintenance information is transmitted from each mobile station and base station of the mobile radio system to the other base station and mobile station via the exchange, so that it is possible to reduce the noise during the voice communication. Flexible services can be provided by agreement between mobile devices that perform data communication such as data transmission, silence control, background noise control, or non-conversion control, speed conversion control, error detection / correction control, etc. during data communication. .

[0035]

As described above, according to the present invention, the maintenance information is transmitted from each mobile station and base station of the mobile radio system to the other base station and mobile station via the exchange, so that the voice communication in the middle of the voice communication is performed. An agreement between mobile devices that performs data communication such as transmitting data during silence, voice control such as silence control, background noise control, or non-conversion control, speed conversion control, and error detection / correction control for data communication. Can provide flexible services.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an entire configuration of a digital mobile radio system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a mobile station, a base station, and a switch according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a PCM highway format according to an embodiment of the present invention;

FIG. 4 is a schematic block diagram showing an overall configuration of a digital mobile radio system according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an internal configuration of a mobile station, a base station, and a switch according to Embodiment 2 of the present invention.

FIG. 6 is a diagram showing a format example of a PCM highway and a synchronous control bus according to the second embodiment of the present invention.

FIG. 7 is a schematic block diagram showing the overall configuration of a digital mobile radio system in a conventional example.

FIG. 8 is a block diagram showing an internal configuration of a base station and a switch in a conventional example.

[Explanation of symbols]

 11, 15 mobile device 111 frame conversion unit 112 control unit 12, 14 base station 121 call connection control unit 122 upstream frame conversion unit 123 transmission error / frame type detection unit 124 upstream maintenance information notification unit 125 downstream frame conversion unit 126 downstream maintenance information Monitoring unit 13 Switching unit 132 Uplink maintenance information monitoring unit 133 Uplink PCM conversion unit 134 Information control unit 135 Exchange control unit 136 Downlink PCM conversion unit 137 Downlink maintenance information notification unit 138 PCM highway 139 Synchronous control bus

Claims (2)

(57) [Claims] An exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station, between the base station and the mobile station, and between the exchange and each base station. A digital mobile radio system that performs digital communication in the base station, wherein the base station detects a received frame type and the like for detecting an uplink received frame type and the like, and performs frame maintenance together with a received frame when the received frame type and the like are detected. Means for multiplexing information and transmitting it to the exchange, and means for detecting maintenance information from a downstream frame from the exchange, multiplexing the maintenance information as a radio frame type or the like, and notifying the mobile equipment of the information, Means for multiplexing maintenance information received from the base station into information channel unused bits of a PCM highway provided in an exchange; Means for separating the maintenance information and receiving the information channel and multiplexing the information to the base station, wherein the mobile station performs silence control according to a radio frame type or the like indicating the maintenance information notified from the base station. VOX control,
A digital mobile radio system comprising control means for performing non-conversion control for data communication, error detection / correction control, and the like, in addition to background noise control that does not give a receiver a sense of discomfort. An exchange, a plurality of base stations connected to the exchange, and a mobile station wirelessly connected to the base station, between the base station and the mobile station, and between the exchange and each base station. A digital mobile radio system that performs digital communication in the base station, wherein the base station detects a received frame type and the like for detecting an uplink received frame type and the like, and performs frame maintenance together with a received frame when the received frame type and the like are detected. Means for multiplexing information and transmitting it to the exchange, and means for detecting maintenance information from a downstream frame from the exchange, multiplexing the maintenance information as a radio frame type or the like, and notifying the mobile equipment of the information, Is a switching controlled PCM highway and a synchronous control bus synchronized therewith, an information channel on the PCM highway, and the maintenance information on the synchronous control bus. Means for multiplexing simultaneously, simultaneously separates information channel and maintenance information from the PCM highway and the synchronous control bus,
Means for multiplexing transmission to the base station, wherein the mobile station performs silence control or VOX control according to a radio frame type indicating maintenance information notified from the base station;
A digital mobile radio system comprising control means for performing non-conversion control for data communication, error detection / correction control, and the like, in addition to background noise control that does not give a receiver a sense of discomfort.