JPH0677886A - Mobile communication system - Google Patents

Abstract

PURPOSE:To reduce a data communication period of time by allowing a network side exchange to allocate plural channels to a mobile terminal equipment within a degree of multiplex of a TDMA channel in the same frequency when the mobile terminal equipment requests the allocation of plural channels. CONSTITUTION:A function requesting allocation of plural channels is provided on mobile terminal equipments 1A-1C. When the mobile terminal equipments 1A, 1B desire the allocation of plural channels, three channels are allocated to, e.g. the mobile terminal equipment 1A within the degree of multiplex of a TDMA channel in a band of the same radio frequency fl and allocates 2TDMA channels within a band of other radio frequency f2 to the terminal equipment 1B and also allocates a remaining 1TDMA channel within a band of a radio frequency f2 to the mobile terminal equipment 1C. Then an exchange 3 receiving a demodulation signal of the reception signal from a base station 2 in the network sends data of each channel to opposite terminal equipments X-Z of each mobile terminal equipment without information compression.

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 radio channel allocation system in digital automobiles and mobile phones.

Normally, in the wired section, 64 Kbps is assigned as one channel information because of the balance of the audio sampling cycle, but the number of radio frequencies (carrier waves) worth the transmission path in the wireless section is different from the wired transmission path. is there.

Therefore, in order to have many users (subscribers) subscribe, how to effectively allocate a radio channel (line) within a predetermined radio frequency band has been studied.

[0004]

2. Description of the Related Art FIG. 10 conceptually shows a conventionally known mobile communication system. In this example, three mobile terminals 1A to 1C are shown as mobile terminals 1, and these mobile terminals 1A to 1C are shown. Base station 2 on the network NW side with respect to terminal 1
And an exchange 30 connected to this base station 2,
The exchanges 30 are connected to the other terminals X to Z via another exchange (not shown).

In such a mobile communication system, there is a currently considered plan to multiplex three channels in one radio frequency band and, in the future, multiplex six channels.
In this case, the mobile terminals 1A to 1C as shown in the figure when three are multiplexed.
The respective wireless transmission signals from 1 to 3 exist within the band of the same wireless frequency f1, and each subscriber has 11.2 Kbps (full rate). Also, 5.6Kb per subscriber when 6 multiplexed
It becomes ps (half rate).

[0006] Then, when the base station 2 which receives such a radio signal sends it to the exchange 30 as it is with the triplex,
The exchange 30 separates information of one line (physical transmission line) into three lines (or multiplex information of three lines into one line (not shown), and sends it to the partner terminals X to Z.

[0007]

The allocation of many channels within one radio frequency band in this way means that the amount of information per subscriber is reduced.

Therefore, at present, voice data per subscriber is compressed by using a special voice encoding system and communication is performed with a small amount of data. However, it is impossible to compress information when performing data communication. That is, there is a problem that the current channel allocation method is not suitable for data communication.

Therefore, the present invention is a mobile communication system in which a transmission signal from a mobile terminal is received by a base station on the network side, which is further separated by an exchange connected to the base station and transmitted to a partner terminal. It is an object of the present invention to perform channel allocation so that the amount of information per subscriber is large not only in data but also in data communication.

[0010]

In order to solve the above problems, the inventor of the present invention pays attention to the fact that the communication channels in the wireless section are not fixed one by one, and one communication (a call set between terminals is performed. To allocate multiple wireless channels dynamically according to demand.

Therefore, in the present invention, as conceptually shown in FIG. 1, the mobile terminal 1 has a function of requesting a plurality of channel allocations, and the mobile terminal 1 transmits the plurality of channel allocation request signals. At this time, the exchange 3 allocates an arbitrary channel within the multiplicity of TDMA channels within the same radio frequency.

That is, as shown in FIG. 1, the mobile terminals 1A ...
When each radio transmission signal from 1C is transmitted, when the mobile terminals 1A and 1B desire to allocate a plurality of channels, for example, the mobile terminal 1A has 3TDMA within the multiplicity of TDMA channels within the same radio frequency f1 band. In addition to allocating channels, the mobile terminal 1B is allocated 2TDMA channels in another band of the radio frequency f2 and the mobile terminal 1C is allocated the remaining 1 in the band of the radio frequency f2.
Allocating TDMA channels.

Then, the exchange 3 which receives the demodulated signals of these received signals from the base station 2 in the network NW.
Is 3 for the partner terminal X of the mobile terminal 1A as shown in the figure.
Sends data for the channel, and the partner terminal Y of the mobile terminal 1B
To the partner terminal Z of the mobile terminal 1C, and the data for one channel is sent to the partner terminal Z of the mobile terminal 1C.

In this way, the information of one subscriber can be sent over a plurality of channels within the same radio frequency band, so that the amount of information can be increased without using a special voice coding system. Even in data communication, a large amount of information can be sent without performing information compression.

Further, according to the present invention, the exchange 2 can determine a channel to be used according to the current channel use condition and give it to the mobile terminal 1, so that effective channel use can be achieved.

Further, in the present invention, when the channel usage rate exceeds a threshold value during the exchange of a plurality of channels, the exchange 2 sends a channel release request to the terminal using the plurality of channels and switches to the single channel communication. It can be performed.

From the viewpoint of further effective use of frequency, this is to allow a change in the used channel during communication,
It has a function to automatically switch to single-channel communication when the line becomes congested.

[0018]

FIG. 2 shows an embodiment of the exchange 3 shown in FIG. 1. In this embodiment, it is composed of a multiplexer / demultiplexer 31 and a line controller 32. Further, an amplifier 311 that amplifies a demodulated signal (data) from the base station 2, three arithmetic units 312 to 314 that commonly receive the output signal of the amplifier 311, and a control signal from the line control unit 32 make one TDMA. A timing generator 315 that gives timing signals for channel allocation to the arithmetic units 312 to 314 respectively, and also receives control signals from the line control unit 32 to generate allocation timing signals for a plurality of TDMA channels to generate arithmetic units 312 to 312. 31
4 and timing generator 316.

The operation of the mobile communication system of the present invention shown in FIG. 1 having the exchange shown in FIG. 2 will be described below with reference to the operation sequence shown in FIG.

First, the mobile terminal 1 notifies the line control section 32 from the base station 2 through the control channel (not shown) of the calling radio condition report (1) shown in FIG. 3 in order to set up the call.

An example of this transmission wireless status report is shown in FIG.
The message type, mobile station type, reception level, number of zones selected, perch channel number, reception level, etc. are included. Whether or not the mobile station type is a multi-channel call request terminal Is shown. It should be noted that the mobile terminal 1 may always report that it is a multi-channel call request terminal when making an outgoing radio status report,
Alternatively, the user may select a single channel or a plurality of channels by using buttons or switches.

In this way, when the call origination wireless status report (1) is sent from the mobile terminal 1 to the line controller 32 in call setting,
As shown in FIG. 3, the call setting acceptance (2) and the authentication request (3) are normally sent to the mobile terminal 1, and the mobile terminal 1 sends an authentication response (4) to the line controller 32. Accordingly, the line control unit 32 further issues a level measurement request (5), whereby the level measurement response (6) is given from the mobile terminal 1 to the line control unit 32.

At this time, the line control unit 32 determines whether or not the originating radio condition report (1) is a terminal desiring to allocate a plurality of channels as shown in step S1 of FIG. That is, when the terminal desires the single channel allocation, the single channel allocation (step S
Perform 2).

This single channel assignment is given to the terminal 1 from the line controller 32 via the base station 2 as a radio channel designation (7) as shown in FIG.

This radio channel designation (7) is composed of message type, frequency code, slot number, color code, scramble code, mobile station maximum transmission power, channel information, etc., as shown in FIG. 4 (b). The slot number in this specifies a single slot (channel).

After the wireless channel is designated (7), the line controller 32 calls the mobile terminal 1 (8).
Then, a response (9) is performed, and a response confirmation (10) is performed from the mobile terminal 1, and then a communication (1
1) will be realized.

Then, the line controller 32 controls the timing generator 315 to give timing signals to the arithmetic units 312 to 314 so that the TDMA channel allocation becomes one channel.

On the other hand, when it is found in step S1 of FIG. 5 that the mobile terminal 1 is a terminal desiring to allocate a plurality of channels, it is judged from the current line usage rate whether the channel is actually free, If there are only available channels, the above single channel allocation (step S
2) is performed, but when multiple channels are available, T
Multiple channels are allocated within the multiplicity of the DMA channels (step S4).

In this multi-channel allocation, the same operation as the above-mentioned single channel allocation is executed, and the radio channel designation (7) (FIG. 4 (b)) shown in FIG. 3 is executed.

However, at this time, the line control unit 32 controls the timing generator 316 this time to make a plurality of TDs.
Generate timing signals for MA channel allocation,
It gives to each arithmetic unit 312-314. Also, when the number of channel assignments differs depending on the mobile terminal, timing signals corresponding to the different numbers are given to the arithmetic units 312 to 314. In this case, multiple channels of the same mobile terminal have the same frequency, but different frequencies are assigned to each mobile terminal.

Thereafter, the line controller 32 determines whether the demodulated signal is data or voice (step S5), and when it is voice, drives a CODEC (not shown) to execute normal voice processing (step S6). ), When it is found to be data, it is passed through the CODEC (step S7),
Which interface is determined (step S8), and interface conversion for personal computer communication, G3 FAX, or G4 FAX is executed (steps S9 to S1).
1). Note that these are basically unrelated to the present invention, and therefore description thereof will be omitted.

The above-mentioned sequence shown in FIG. 3 shows a sequence when the mobile terminal 1 side arbitrarily makes a call. In FIG. 6, the line control unit 32 calls the mobile terminals 1 simultaneously ( 20) shows a sequence at the time of receiving a call in the mobile terminal 1 when the mobile terminal 1 is called. When the simultaneous call (20) is made from the line controller 32 in this way, the mobile terminal 1 reports the incoming radio state (21). ) Is done.

The contents of this incoming radio report are as shown in FIG. 7, but basically the contents are the same as those shown in FIG. 4 (a) except that the incoming call identification number is added. I am doing it.

That is, the identification number of the mobile terminal is inserted in the incoming identification number in the incoming radio status report (21), and whether a multi-channel call or a single-channel call is requested for mobile station identification. Will be designated and notified to the line control unit 32.

Thereafter, between the line controller 32 and the terminal 1, as in the case of FIG. 3, the authentication request (3), the authentication response (4), the level measurement request (5), and the level measurement response (6). ), The wireless channel designation (7) is executed, and after this wireless channel designation (7) is executed, the line controller 32
Performs call setting (22) for the terminal 1.

As a result, the mobile terminal 1 makes a call (8) and a response (9) and confirms the response from the line controller 32 (1
The communication (11) between both parties is started by 0).

As described above, the line control unit 32 constantly monitors the current line usage rate. FIG. 7 shows a sequence at the time of channel switching when the line usage rate rises. .

That is, the line control unit 32 constantly monitors the channel usage rate (step S21), and checks whether the monitored channel usage rate exceeds a threshold value or not in step S2.
Judge with 2.

As a result, when the channel usage rate is less than or equal to the threshold value, arbitrary channel allocation can be performed as described in step S3 of FIG. 5, but if the channel usage rate exceeds the threshold value, The current multi-channel communication is changed to single-channel communication (step S23).

The switching sequence to the single channel allocation is shown in FIG. 8. First, when the channel control unit 32 issues a channel release request (31) to the mobile terminal 1,
In response to this, the mobile terminal 1 returns the confirmation (32) to the line control unit 32.

Then, the line control unit 32 makes a level measurement request (33) to the mobile terminal 1, so that the level measurement response (34) is returned from the mobile terminal 1, and the line control unit 32 follows the level measurement value. A conventionally known switching destination radio channel designation (35) for switching to a single channel of another radio frequency in the same area is performed, and channel switching in the mobile terminal 1 is executed. After that, the normal procedure will be executed.

[0042]

As described above, according to the mobile communication system of the present invention, the mobile terminal has a function of requesting multiple channel allocation, and when the mobile terminal outputs a multiple channel allocation request, the network Since the exchange on the side is configured to allocate one or more arbitrary channels within the multiplicity of TDMA channels in the same radio frequency to the same mobile terminal, increase the number of channel allocation for one subscriber. The data communication time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a concept of a mobile communication system according to the present invention.

FIG. 2 is a block diagram showing an embodiment of an exchange used in the mobile communication system according to the present invention.

FIG. 3 is a flowchart showing a sequence when a mobile terminal makes a call in the mobile communication system according to the present invention.

FIG. 4 is a diagram showing an embodiment of reporting / designation used in the mobile communication system according to the present invention.

FIG. 5 is a flowchart showing an operation sequence of a line control unit used in the mobile communication system according to the present invention.

FIG. 6 is a flow chart diagram showing a sequence when a mobile terminal in the mobile communication system according to the present invention receives a simultaneous call, and when there is an incoming call.

FIG. 7 is a diagram showing the contents of an incoming wireless status report in a sequence when a mobile terminal receives an incoming call.

FIG. 8 is a diagram showing a channel switching sequence in a line control unit used in the mobile communication system according to the present invention.

FIG. 9 is a diagram specifically showing a channel switching sequence in a line control unit used in the mobile communication system according to the present invention.

FIG. 10 is a block diagram conceptually showing a conventional method.

[Explanation of symbols]

 1 (1A to 1C) Mobile terminal 2 Base station 3 Switch NW network The same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A transmission signal from a mobile terminal (1) is received by a base station (2) on the network side, which is further received by the base station (2).
In the mobile communication system in which the mobile terminal (1) is separated by the exchange (3) connected to the terminal and transmits to the other terminal, the mobile terminal (1) has a function of requesting multiple channel allocation, and the mobile terminal (1) When the plural channel allocation request signal is transmitted, the exchange (3) allocates one or more arbitrary channels within the same radio frequency within the multiplicity of the TDMA channel to the same mobile terminal. Mobile communication system. 2. The mobile terminal, wherein the exchange (2) determines the number of available channels according to the usage rate of wireless TDMA channels.
The mobile communication system according to claim 1, wherein the mobile communication system is provided in (1). 3. The switching system (2) sends a channel release request to a terminal using the multiple channels when the channel usage rate exceeds a threshold value during the multiple channel communication, and switches to single channel communication. The mobile communication system according to claim 1 or 2, wherein