JPH06245250A - Mobile communication system - Google Patents

Abstract

PURPOSE:To utilize effectively a CODEC in which a CODEC corresponding to a time slot used for controlling call connection in a radio channel is not wasted. CONSTITUTION:Outputs S1-1-S1-k of a multiplexer/demultiplexer circuit 9 are outputted through a switch circuit 7 to signal lines C1, C2,..., Cm. Then a 64kbps voice signal from an exchange 103 is subjected to speed conversion of 16kbps by CODECs 12-1-12-m and resulting signals d1-dm are inputted to a switch circuit 8. The switch circuit 8 is controlled by a control section 13 to apply time division and multiplexing to the outputs d1-dm of the CODECs 12-1-12-m and to output a resulting 64kbps signal to the switch circuit 7 via signal lines e1,..., el. Then the switch circuit 7 connects the signal lines e1,..., el of the switch circuit 8 to any of signal lines a1, a2,..., an of the switch circuit 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a mobile communication system for digital communication in which a service area is constituted by a plurality of wireless zones such as a car telephone.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a general configuration of a mobile communication system used for automobile radio and the like.

This mobile communication system includes a mobile station 100-
1 to 100-j, wireless base stations 101-1 and 101-2 that communicate with the mobile stations 100-1 to 100-j by a wireless line using a wireless frequency, and a base station controller 102.
And a higher-level switching center 104 including a switching system 103. The base station control device 102 includes a radio base station 101-
1, 101-2 are controlled, and the radio base station 101-
Mobile stations 100-1 to 100-j through 1, 101-2
And call connection operation. The exchange 103 is the mobile station 100.
Radio base stations 101-1, 10 from -1 to 100-j
Communication signals passing through 1-2 and the base station control device 102 are
By switching the line with the switch circuit, connection to the public communication line network or vice versa is performed.

FIG. 4 shows a radio base station 101 (radio base station 10
1-1, 101-2) and the base station control device 102, and FIG. 5 is a diagram showing a signal format in which the multiplexing / demultiplexing circuit 9 separates the multiplexed signal from the exchange 103.

The multiplexer / demultiplexer circuit 9 is connected to the switch 103 to 2M.
64 Kbps, which is used to input the multiplexed signal transmitted at the transmission rate of bps and separate it for normal time division switching
, Separated signals S1-1, S1-2, ..., S1-k. These separated signals are usually 32 as shown in FIG.
It is a time division signal having a unit of time slots TS0 to TS31. These time slots TS0 to T
S31 has, for example, sub-slots TS0 (R), TS1 (R), and TS2 (R) capable of accommodating mobile communication voice / data signals for four channels or control signals for call connection. The switch circuit 7 is the corresponding radio base station 101-
1 or 101-2 and separated signals S1-1 and S1 for each transceiver that can communicate with the corresponding mobile station in the radio base station.
, 2, ..., S1-k are time division exchange switches. The control signal processing circuit 11 exchanges control signals with the mobile station via the wireless base station 101, and controls the switch circuit 7. Speech encoder / decoder (CODEC) 12-1
First CODEC consisting of 1, 12-12, 12-13
The group corresponds to the transceiver 3-1 in the wireless base station 101, and the second CODEC group consisting of CODECs 12-21, 12-22, 12-23 corresponds to the transceiver 3-2 in the wireless base station 101. , ..., CODEC12-n
N-th CODEC consisting of 1, 12-n2 and 12-n3
The group corresponds to the transceiver 3-n in the radio base station 101. Each of these CODEC groups distributes the 64 Kbps distributed signal output from the switch circuit 7 to a 16 Kbps transmission signal used in the mobile communication system.
Signal (wireless distribution signal) a1, a2, ..., An. Here, the outputs S1-1 to S1 of the multiplexing / demultiplexing circuit 9
The main line k of the -k signal line and the number n of CODEC groups
The difference is that 3 of 2 Mbps signal from exchange 103
This is because two time slots are not all used, and the number n of CODEC groups may be increased or decreased with respect to the number of time slots on the system. The radio distribution signal is, for example, as shown in FIG. 5, a sub-time slot T for four channels.
S0 (R) to TS3 (R), and normally voice to the mobile station in sub time slots TS0 (R) to TS2 (R).
A supervisory signal for speed conversion is assigned to the data signal and sub-time slot TS3 (R). Here, the call connection signal a0 is not subjected to speed conversion, and passes through the multiplexer / demultiplexer circuit 6 in the corresponding transceiver in the radio base station 101, and the time slot of the mobile station to be call connected, for example, in FIG.
If TS0 (R) and so on are empty time slots, they are inserted there. The multiplexer / demultiplexer circuit 6 multiplexes the outputs a1, a2, ..., An of each group of CODECs and the call connection signal a0, and transmits the multiplexed signal to the radio base station 101.

Although only one output signal line from the multiplexer / demultiplexer circuit 6 to the radio base station 101 is shown in FIG. 4,
Actually, there are as many wireless base stations as there are. The switch circuit 7 determines to which radio base station the multiplexed signal should be transmitted. This is because the control unit 13 controls which mobile station the wireless base station 101 is communicating with.
This is because it is possible to control to which wireless base station the 16 Kbps signal generated in 1. should be transmitted.

Base station controller 102 and radio base station 101
There is a distance of several tens of kilometers between -1, 101-2,
Moreover, since it communicates with the radio base station 101 including an unspecified number of mobile stations, a serial transmission signal of 2 Mbps is used as the multiplexed signal. In the mobile communication system, the exchange 1
03 between the base station controller 102 and the base station controller 102 or between the base station controller 102 and the radio base stations 101-1 and 101-2 is 2 Mb.
Although it is assumed that the serial transmission signal of ps is used, a serial signal of 1.5 Mbps or a higher hierarchy of 8 Mbps or 6 Mbps can be used. The multiplexed signal to this radio base station 101 is
As shown in FIG. 5, 32 time slots TS0 to T
Each of the time slots TS0 to TS31 is composed of S31.
For example, the time slot TS1 is composed of three voice / data sub-time slots TS0 (R) to TS2 (R) (where (R) means a RADIO time slot). Here, sub-time slot TS3
In the conventional example, (R) is not used for a voice coded signal, but is used for CODEC monitoring / control. The control signal processing circuit 11 sends a call connection signal for performing the call connection operation with the mobile station to the multiplexing / demultiplexing circuit 6 through the switch circuit 7 and the signal line a0 of the call connection signal, and the call connection signal is multiplexed / demultiplexed circuit 6 Then, the signal is multiplexed in a specific time slot of the 2 Mbps multiplexed signal and transmitted to the wireless base station 101. The control unit 13 sends a switching control signal to the switch circuit 7 and controls the control signal processing circuit 11, so that the host exchange 103
Alternatively, it controls transmission / reception of control signals to / from the mobile station.

The radio base station 101 includes a multiplexing / demultiplexing circuit 5
, Transceivers 3-1 to 3-n, and control signal processing circuit 4
And a combination that combines the transmission signals from the transceivers 3-1 to 3-n and distributes the reception signals to the transceivers 3-1 to 3-n.
It is composed of a distribution circuit 2 and an antenna 1. The demultiplexing / demultiplexing circuit 5 demultiplexes the multiplexed signal from the base station controller 102 into signals a1, a2, ..., An, and demultiplexes them into respective transceivers 3-1, 3-2 ,. . Each transceiver 3
As shown in FIG. 6, sub-time slots TS0 (R) to TS2 (R) included in an arbitrary time slot of a multiplexed signal of 2 Mbps are grouped as -1 to 3-n to change the wireless line. To do. That is, each of the signals of the sub-time slots TS0 (R) to TS2 (R) is subjected to data processing such as an error correction code addition and an interleave processing to easily recover a bit error on the wireless line, A start word (SW) signal indicating the identification of the time slot on the line is added and transmitted to the mobile station. Further, the call connection signal from the base station control device 102 is separated by the multiplexing / demultiplexing circuit 5, and once received by the control signal processing circuit 4, it is moved from an arbitrary transceiver using an arbitrary time slot. Sent to the station.

[0009]

This conventional base station control device is equipped with a CODEC so as to have a one-to-one relationship with the time slot on the wireless line output from each transceiver. For example, on the wireless line. In a system in which 3 time slots (see FIG. 6) are time-division multiplexed,
The CODEC corresponding to the time slot used for controlling the call connection on the wireless line is not used because it is configured to connect a 64 Kbps line in which the output of ODEC is time-division multiplexed to the transceiver. COD
There was a drawback that EC was wasted.

An object of the present invention is to provide a COD corresponding to a time slot used for controlling a call connection on a wireless line.
An object of the present invention is to provide a mobile radio communication system in which EC is not wasted and CODEC can be effectively used.

[0011]

In order to achieve the above object, a mobile radio communication system of the present invention comprises a plurality of mobile stations, a plurality of radio base stations communicating with these mobile stations via radio lines, and a plurality of these base stations. A base station control device for controlling a radio base station and performing a call connection operation with the mobile station through the radio base station, wherein the base station control device comprises first switch means for switching a communication path; The switching signal is provided between the first switch means and the switching center, separates the multiplexed signal transmitted from the higher-level switch, outputs the multiplexed signal to the first switch means, multiplexes the output of the first switch means, and the switch. Is provided between the first switch means and the radio base station, and the output of the first switch means is multiplexed and transmitted to the radio base station. Multiplexed signal from A second multiplexing / separating means for separating and outputting to the first switch means, and a voice data signal from the exchange, which is connected to the first switch means and output from the first switch means, are used for mobile communication. It has a plurality of voice coding means for converting into a low speed voice code signal, and second switch means for time-division-multiplexing and multiplexing arbitrary outputs of these voice coding means to the first switch means.

[0012]

The arbitrary output of the voice coding means is time-division-multiplexed by the second switch means, and the multiplexed signal is inputted to the first switch means so that it can communicate with an arbitrary transceiver. With the configuration, the voice coding means can be effectively used.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a radio base station and a base station controller in a mobile communication system according to an embodiment of the present invention,
FIG. 2 is a flowchart showing the operation of the switch circuits 7 and 8.

The mobile communication system of this embodiment is provided with a base station controller 102A instead of the base station controller 102 in the mobile communication system shown in FIG.

The base station controller 102A is composed of the CODECs 12-11 to 12-13 of the conventional base station controller 102.
12-21 to 12-23, ..., 12-n1 to 12-n3
Instead of CODEC 12-1, 12-2, ..., 12-m
And a switch circuit 8. Where CODEC1
The number m of 2-1 to 12-m is less than or equal to the number k of the output signals S1-1 to S1-k of the multiplexing / demultiplexing circuit 9, and m <3n.

The multiplexer / demultiplexer circuit 9 is connected to the switch 2 from the exchange 103.
Receive an Mbps multiplexed signal and send it to multiple 64 Kbps.
s signals S1-1, S1-2, ..., S1-k are decomposed and output to the switch circuit 7. The switch circuit 7 outputs the outputs S1-1 to S1-k of the multiplexing / demultiplexing circuit 9 to the CODEC 12-
, 12-2, ..., 12-m connected to the signal lines C1,
Output to C2, ..., Cm (step 31). Therefore, the 64 Kbps voice signal from the exchange 103 is COD.
The speed is converted to 16 Kbps by the ECs 12-1 to 12-m, and the signals d1 to dm are input to the switch circuit 8. The switch circuit 8 is controlled by the control unit 13, and the COD
The outputs d1 to dm of the ECs 12-1 to 12-m are selected in a time division manner and further multiplexed to form a 64 Kbps signal.
, And output to the switch circuit 7 via el. That is,
If the switch circuit 8 has no control time slot,
The output of any three CODECs is multiplexed to obtain the signal line e1.
To el (steps 32 and 33), if there is one control time slot, the outputs of any two CODECs are multiplexed and output to the signal lines e1 to el (step 3).
If there are two control time slots, the output of any one CODEC is output to the signal line e1 (steps 34 and 36). The switch circuit 7 connects the signal lines e1 to el of the switch circuit 8 to any of the signal lines a1, a2, ..., An of the switch circuit 7. In this embodiment, 16 Kbps signals are multiplexed into 3 and 64 Kb
This 64 Kbps signal line e1 is placed on the ps signal line.
.. to el are connected to one of the signal lines a1 to an by the switch circuit 7, further multiplexed by the multiplexing / demultiplexing circuit 6, and then transmitted to the wireless base station 101. In this case, on the wireless line, 2 Mbp from the multiplexer / demultiplexer circuit 6 as shown in FIG.
Each time slot signal of the s multiplexed signal is the radio base station 10
The signals are transmitted from the transceivers 3-1 to 3-n in No. 1. Therefore, the control unit 13 has the CODECs 12-1 to 12-1.
The CODEC corresponding to the time slot in which the control signal is transmitted on the wireless line when the 12-m outputs d1 to dm are time-division multiplexed by the switch circuit 8 and time-division switching is performed.
Control not to be connected. The control signal from the control signal processing circuit 11 controlled by the control unit 13 is selected by the switch circuit 7 via the signal line S3, multiplexed by the multiplexing / demultiplexing circuit 6 via the signal line a0, and sent to the radio base station 101. To be done.

The control unit 13 determines, as system parameters, the number of transceivers for transmitting and receiving control signals and the numbers of a plurality of time slots for transmitting and receiving control signals. These parameters are subject to change during system operation. In addition, the signal lines a1 to
The number n of an, the base station control device 102A, and the radio base station 1
The number p does not match the number p of time slots multiplexed at 2 Mbps between 01 and p <n.

In the radio base station 101, the base station controller 1
The digital multiplexed signal from 02A is received by the multiplexing / demultiplexing circuit 5, separated, and output to the transceivers 3-1 to 3-n through the signal lines a1 to an. Transceiver 3-1 to 3-n
Then, as shown in FIG. 6, the received data TS0 (R) to TS2 (R) from the base station controller 102A are subjected to error correction code and signal interleaving processing, etc., and sent to the mobile station. In addition, the base station control device 102
The call connection signal sent from A is the multiplexing / demultiplexing circuit 5
Is received by the control signal processing circuit 4 via the signal line a0. The control signal processing circuit 4 sends a call connection signal to a transceiver assigned to control signal transmission / reception. The transceiver transmits / receives a control signal in an arbitrary time slot according to a command from the control signal processing circuit 4.

In this embodiment, only signals in the lower direction from the exchange 103 to the radio base station 101 have been described, but signals in the higher direction from the mobile station to the exchange 103 can be similarly described. Further, although the switch circuit 8 and the switch circuit 7 are described as separate configurations, the switch circuit 7 may have the function of the switch circuit 8. Although a 64 Kbps signal is used as the switching method of the switch circuit 7, for example, a similar operation can be realized by using a time division switch (TDSW) in which a 2 Mbps signal is input to the switch circuit 7.

[0021]

As described above, according to the present invention, the signal from the host exchange is connected through the switch means to the voice encoding circuit for converting an arbitrary voice signal into a low bit rate and the voice encoding circuit. By synthesizing and multiplexing any output of the above by switch means, and by arranging the output of this synthesized and multiplexed signal to be able to communicate with any transmitter / receiver by the switch means, it is possible to effectively use the speech coding circuit. Have.

[Brief description of drawings]

FIG. 1 is a block diagram of a base station control device in a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of switch circuits 7 and 8 in FIG.

FIG. 3 is a configuration diagram of a general mobile communication system.

FIG. 4 is a block diagram of a conventional base station controller.

FIG. 5 is a format diagram of a signal used between a base station control device and a radio base station.

FIG. 6 is a format diagram of a signal on a wireless section.

[Explanation of symbols]

 1 Antenna 2 Combining / Distributing Circuit 3-1 to 3-n Transceiver 4 Control Signal Processing Circuit 5, 6, 9 Multiplexing / Demultiplexing Circuit 7, 8 Switch Circuit 11 Control Signal Processing Circuit 12-1 to 12-m CODEC 13 Control Part 100-1 to 100-j Mobile station 101, 101-1 to 101-2 Radio base station 102, 102A Base station control device 103 Switch

Claims (4)

[Claims] 1. A plurality of mobile stations, a plurality of radio base stations that communicate with these mobile stations via radio lines, and control these radio base stations to perform a call connection operation with the mobile stations through the radio base stations. A base station controller, wherein the base station controller switches the communication path
Switch means, and between the first switch means and the exchange, the multiplexed signal transmitted from the exchange is separated, output to the first switch means, and the output of the first switch means is multiplexed. , The first multiplex transmitted to the exchange
The separating means is provided between the first switch means and the plurality of radio base stations, the output of the first switch means is multiplexed and transmitted to the radio base station, and the multiplexed signal from the radio base station is transmitted. A second multiplexing / separating means for separating and outputting to the first switch means, and a voice data signal from the exchange, which is connected to the first switch means and is output from the first switch means, for mobile communication. Mobile communication having a plurality of voice coding means for converting to a low speed voice code signal and a second switch means for time-division / multiplexing arbitrary outputs of these voice coding means and outputting them to the first switch means. system. 2. The first switch means is 64 Kbp
The mobile communication system according to claim 1, wherein the mobile communication system is an s signal switch means. 3. The mobile communication system according to claim 1, wherein the second switch means is integrated with the first switch means. 4. When the number of multiplexed signals transmitted from the radio base station to the same mobile station is 3, and the second switch means does not have a control time slot, the plurality of voice signals are transmitted. The outputs of arbitrary three speech coding means among the coding means are multiplexed and output, and the control time slot is 1
In the case of two, the outputs of arbitrary two voice encoding means among the plurality of voice encoding means are multiplexed and output, and in the case of two control time slots, the plurality of voice encoding means The mobile communication system according to claim 1, wherein any one of the outputs of the means is output as it is.