JPH05153032A - System and equipment for digital radiophone communication - Google Patents

Abstract

PURPOSE:To provide a movable digital radiotelephony communication equipment independently using a half rate slot and effectively using a channel. CONSTITUTION:The equipment is mounted on a movable body such as vehicles and provided with an antenna 14, a radio transmission/receiving circuit 12, a data link circuit 15, a control circuit 11, further, a first speech coder 17 and a first calling processing circuit 18 and a firs handset 19, and a second speech coder 21 and a second calling processing circuit 22 and a second handset 23 which are provided in parallel with the speech coder 17 and the circuit 18 and the handset 19. Two slots of each block multiplexed in time division are used as the half rate, for example, a slot 1 is used for the telephone communication of the first handset 19 and a slot 4 is used for the telephone communication of the second handset 23. Thus, two handsets 19 and 23 can be simultaneously utilized with one equipment.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a digital cellular (Ce
lluar) mobile communication system and other digital radiotelephone communication systems. In particular, two slots in each block of a communication channel time-division-multiplexed in a digital time-division multiplexing system are used. The present invention relates to a half-rate / dual-mode digital radiotelephone communication method that enables simultaneous use of communication devices having two telephone functions, and the device.

[0002]

2. Description of the Related Art As a mobile communication system, a cellular telephone communication system implemented in the United States is known. Currently, the analog cellular system is frequency-multiplexed and used, but various new digital cellular systems have been proposed to incorporate various new functions, improve performance, and further standardize internationally. ing.

Among such digital radio telephone communication systems based on the cellular system, as a digital radio telephone communication system mounted on a moving body such as a vehicle, in the US etc., a dual mode cellular system is called "TIA".
A frequency-multiplexed channel signal based on the "IS 54A" standard is time-division-multiplexed by time division multiplexing (TDMA) into six slots, and each slot is used for communication in a full-rate dual-mode cellular system. Mobile digital radiotelephone communication devices are known.

FIG. 3 shows the configuration of the mobile digital radio telephone communication apparatus of the full rate dual mode cellular system. The mobile digital radio telephone communication device shown in FIG. 3 includes an antenna 33, a radio transmission / reception circuit 32, and a control circuit 3.
1, a data link circuit 35, a speech coder 37, a call processing circuit 38 and a handset 39, and these circuits are mounted on a vehicle, for example, a passenger car.

The radio transmitter / receiver circuit 32 frequency-converts the signal received from the antenna 33 into an intermediate frequency band signal. The wireless transmission / reception circuit 32 also converts a signal to be transmitted into a frequency that can be transmitted from the antenna 33. The data link circuit 35 has not only a data link function but also a modulation function and a demodulation function (MODEM function) for performing telephone call communication. The speech coder 37 has a built-in codec (CODEC) and performs conversion processing of a call signal.
The call processing circuit 38 performs call control processing and call reception control processing for telephone communication. A handset 39 is connected to the speech coder 37 and the call processing circuit 38, and a user talks via the handset 39. The control circuit 31 controls the entire circuit described above.

The mobile digital radiotelephone communication apparatus shown in FIG. 3 divides each frequency-multiplexed channel shown in FIG. 4 into 6 slots by the TDMA method, and divides these divided 1 channels. The two slots in the block are grouped together to operate as a full-rate dual-mode cellular type digital radio telephone communication device used by one mobile digital radio telephone communication device. In this example, slot 1 and slot 4 form a first set, slot 2 and slot 5 form a second set, and slot 3 and slot 6 form a third set, as shown in FIG. Another mobile digital radiotelephone communication device uses, for example, the first set of slots 1 and 4. The other two slot sets are used by the other two mobile digital radiotelephone communication devices. Therefore, in the mobile digital radio telephone communication device shown in FIG. 3, the speech coder 37, the data link circuit 35, the transmission / reception circuit 32 and the control circuit 31 operate so that the slot 1 and the slot 4 are used for one telephone. ..

[0007]

In the full rate configuration shown in FIG. 4, six mobile slots are originally available for six mobile digital radiotelephone communication devices, but two slots are used in the conventional system. Is used by one mobile digital radio telephone communication device, and is only used by three mobile digital radio telephone communication devices, and there is a problem that the utilization efficiency of the communication channel is low.
Further, although the transmission / reception circuit 32 and the data link circuit 35 have the processing capability of two telephones, they can be used only for one telephone and the device (resource) is not effectively used. .. Further, half-rate processing of a speech coder is expected in the future, but the mobile digital radiotelephone communication device having the above-mentioned configuration cannot be used as it is in the half-rate communication mode, and new development is required. Further, there is also a demand for a mobile digital wireless telephone communication device that can be used in a mixed communication mode of half rate and full rate, and the above-mentioned conventional mobile digital wireless telephone communication device cannot meet such demand, and so-called back-up is required. There is also the problem of lack of word compatibility. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a digital radiotelephone communication method and apparatus for solving the above-mentioned full rate problem and effectively utilizing the channel.

[0008]

In order to solve the above problems, according to the present invention, channel signals are time division multiplexed into blocks each having a plurality of slots, and two slots in each block have a telephone function. A digital wireless telephone communication method is provided which is used for communication between two different devices. Further, according to the present invention, it has an antenna, a radio transmitting / receiving means connected to the antenna, a modulating / demodulating means connected to the radio transmitting / receiving circuit, a first telephone signal processing means, and a second telephone signal processing means. ，
A digital radio telephone characterized in that two slots in each block in which a channel signal is time-division multiplexed into a block consisting of a plurality of slots are used for communication of the first and second telephone signal processing means. A communication device is provided.

[0009]

The two slots in each block of the time-division-multiplexed communication channel are half-rate (Half rat).
As e), it can be simultaneously used for two different devices each having a telephone function such as a telephone. Examples of devices having these telephone functions include a facsimile device and a Pancon communication device in addition to the telephone device itself. In this way, since a pair of slots of each slot obtained by time-division multiplexing the communication channel and dividing it into a plurality of slots can be independently and simultaneously used by devices having different telephone functions, effective use of the communication channel can be achieved. Will be possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A half-rate dual-mode cellular communication type mobile digital radio telephone communication apparatus as an embodiment of the digital radio telephone communication system of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of a mobile digital radio telephone communication device mounted in a passenger car. The mobile digital radio telephone communication device includes an antenna 14, a radio transmission / reception circuit 12, a control circuit 11, a data link circuit 15,
It has a first speech coder 17, a first call processing circuit 18, a first handset 19, a second speech coder 21, a second call processing circuit 22 and a second handset 23. That is, the mobile digital radiotelephone communication device shown in FIG. 1 has a first set of telephone communication units including a first speech coder 17, a first call processing circuit 18 and a first handset 19, and a second set of telephone communication units. It consists of a second set of telephone communication units consisting of a speech coder 21, a second call processing circuit 22 and a second handset 23.

FIG. 2 shows a slot structure of a signal block of a half-rate time division multiplexed channel used by the mobile digital radiotelephone communication device shown in FIG. Each time-divided block is divided into 6 slots as in the configuration shown in FIG. However, the mobile digital radiotelephone communication apparatus of the present invention uses, for example, slot 1 for the first set of telephone communication units and slot 4 for the second set of telephone communication units as a half rate rather than the conventional full rate. Used in.

The circuit configurations of the control circuit 11 and the data link circuit 15 and the processing functions thereof are respectively the radio transmission / reception circuit 32, the control circuit 31, and the data link circuit 3 shown in FIG.
5, but as described above, the mobile digital radiotelephone communication device shown in FIG. 1 allows two sets of telephone communication units to communicate at the same time, so that their operating speeds are different. Each of the first speech coder 17 and the second speech coder 21 is a half-rate codec for processing a signal of 1 slot, and is different from the full-rate speech coder 37 for processing a signal of 2 slots shown in FIG. First call processing circuit 18 and second call processing circuit 2
2 basically performs the same processing as the call processing circuit 38 shown in FIG.

Data link circuit 15 and control circuit 11
As described above, the operation processing speed becomes high, but considering the frequency band of the audio signals from the first handset 19 and the second handset 23, considering the recent improvement in the signal processing speed of the electronic circuit. ， It is not a problem in practical use.

When the circuit shown in FIG. 1 is specifically configured, the first speech coder 17 and the second speech coder 21, the first call processing circuit 18 and the second call processing circuit 2 are included.
It is not necessary to have a circuit configuration in which 2 is separated. For example, in the case of configuring a digital signal processing device (DSP) that performs high-speed signal processing for the codec built in the first speech coder 17, one of these first speech coder 17 and second speech coder 21 is used. Can be operated by the DSP, and in view of the DSP performance, the data link circuit 15, the first speech coder 17, the first call processing circuit 18, the second speech coder 21, and the second call processing. It is also possible to process the circuit 22 with a single DSP. The control circuit 11 is composed of, for example, a microcomputer so that it can flexibly deal with various processing contents.

As described above, by using the half rate dual mode, for example, when two handsets 19 and 23 are mounted on a passenger car, those handsets can be used at the same time. As a more specific application of the mobile digital wireless telephone communication device, for example, when a taxi is assumed as a passenger car, the first handset 19 is used by a driver and the second handset 23 is used by a passenger. Is possible.

In the mobile digital radiotelephone communication device shown in FIG. 1, the first handset 19 and the second handset 19 are used.
Instead of the handset 23, other devices that perform modulation processing and demodulation processing similarly to telephone signals, such as a facsimile machine and a personal computer communication device, can be used. For example, in a passenger car, the first handset 19
Is used as an ordinary telephone and the second handset 23
It becomes possible to use the system as a facsimile machine.

On the other hand, the mobile digital radiotelephone communication apparatus of the present invention can be used as it is, for example, when only one of the first speech coder 17 and the second handset 23 is mounted in a passenger car or the like. is there.

Although the above-described embodiments have been described in connection with the mobile digital radiotelephone communication device of the half rate dual mode cellular system, they are not limited to the cellular phone communication of the cellular system and a plurality of time division multiplexed channels are used. It goes without saying that it can be applied to other digital wireless telephone communication systems that are used by dividing into slots.

[0019]

As described above, according to the present invention, when the time division multiplexed channel signal is divided into a plurality of slots and used, it can be effectively used as a half rate dual mode. As a result, it becomes possible to effectively use the frequencies in the communication system, and it becomes possible to simultaneously use two devices having a telephone function with one mobile digital radio telephone communication device. Further, according to the present invention, the problem of backward compatibility in the conventional full rate dual system is solved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a mobile digital radio telephone communication device using a half rate slot as an embodiment of a digital radio telephone communication system of the present invention.

FIG. 2 is a diagram showing a usage pattern of a half rate slot in the mobile digital telephone wireless communication device shown in FIG.

FIG. 3 is a block diagram of a conventional mobile digital radiotelephone communication device using a full-rate slot.

FIG. 4 is a diagram showing a form in which a full rate slot is used in the mobile digital telephone wireless communication device shown in FIG.

[Explanation of symbols]

11 ... Control circuit, 12 ... Wireless transceiver circuit, 14 ...
Antenna, 15 ... data link circuit, 17 ... first speech coder, 18 ... first call processing circuit, 19 ...
The first handset, 21 ... the second speech coder,
22 ... second call processing circuit, 23 ... second handset.

Claims (2)

[Claims] 1. A channel signal is time-division multiplexed into blocks each having a plurality of slots, and two blocks in each block are multiplexed.
A digital wireless telephone communication method, wherein one slot is used for communication between two different devices having a telephone function. 2. A channel comprising an antenna, a radio transmitting / receiving means connected to the antenna, a modulating / demodulating means connected to the radio transmitting / receiving circuit, a first telephone signal processing means, and a second telephone signal processing means. Digital radiotelephone communication characterized in that two slots in each block in which a signal is time-division multiplexed into a block consisting of a plurality of slots are used for communication of the first and second telephone signal processing means. apparatus.