JP3242709B2 - Mobile communication 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 mobile communication system, and more particularly to a wireless channel allocation system in a digital car / cell phone.

Normally, 64 Kbps is assigned as information of one channel in a wired section in consideration of an audio sampling period. However, unlike a wired transmission path, the number of radio frequencies (carriers) worthy of a transmission path in a wireless section is limited. 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 in the past.

[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 a mobile terminal 1, and these mobile terminals 1A to 1C are shown. The base station 2 is located on the network NW side with respect to the terminal 1.
And a higher-level device from the base station connected to this base station 2.
For example, an exchange 30 , which is a (base station host device), is provided. The exchanges 30 are connected to terminals X to Z on the other side via another exchange not shown.

[0005] In such a mobile communication system, there is a scheme currently considered in which three channels are multiplexed in one radio frequency band and six channels are multiplexed in the future.
In this case, at the time of triple multiplexing, the mobile terminals 1A to 1C
Are in the same band of the radio frequency f1, and each subscriber has 11.2 Kbps (full rate). 5.6Kb per subscriber for 6 multiplexing
ps (half rate).

When the base station 2 receives such a radio signal, the base station 2 transmits the radio signal to the exchange 30 as it is in the form of three multiplexes.
The exchange 30 separates the information of one line (physical transmission line) into three lines (or multiplexes the information of the three lines into one line, not shown), and sends it to the destination terminals X to Z.

[0007]

Allocating a large number of channels within one radio frequency band in this way means a reduction in the amount of information per subscriber.

Therefore, at present, a special voice coding method is used to compress voice data per subscriber and perform communication with a small amount of data. However, when data communication is performed, information compression is not possible. That is, there is a problem that the current channel allocation method is not suitable for data communication.

Accordingly, the present invention provides a mobile terminal and the mobile terminal.
A base station that relays signals from, exist on the upper side of the base station
In a mobile communication system comprising existing base station upper-level devices ,
An object of the present invention is to perform channel allocation such that the information amount per subscriber increases in not only voice data but also data communication. Also, the present invention relates to such a mobile communication method.
Providing a mobile terminal and a base station host device used in the equation
With the goal.

[0010]

In order to solve the above-mentioned problems, the present inventor has focused on the fact that communication channels in a wireless section are not fixed by themselves, and made one communication (calls set between terminals). To dynamically allocate a plurality of wireless channels to the route) as required.

Therefore, according to 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 multi-channel allocation request signal. At this time, the exchange 3, which is an example of a base station higher-level device, allocates an arbitrary channel within a possible range within the multiplicity of TDMA channels in the same radio frequency.

That is, as shown in FIG.
When each wireless transmission signal from 1C is transmitted, when the mobile terminals 1A and 1B desire to assign a plurality of channels, for example, the mobile terminal 1A can transmit 3TDMA within the same radio frequency f1 within the TDMA channel multiplicity. Channels are allocated and the mobile terminal 1B is allocated 2 TDMA channels in the band of another radio frequency f2 and the mobile terminal 1C is allocated the remaining 1 in the band of the radio frequency f2.
TDMA channels are allocated.

The exchange 3 receives the demodulated signals of these received signals from the base station 2 in the network NW.
Is 3 with respect to the partner terminal X of the mobile terminal 1A as shown in FIG.
The data for the channel is transmitted, and the partner terminal Y of the mobile terminal 1B is transmitted.
, And data for one channel is sent to the partner terminal Z of the mobile terminal 1C.

As described above, since information of one subscriber can be transmitted over a plurality of arbitrary channels as much as possible among a plurality of channels in the same radio frequency, a special voice coding system is used. Since the amount of information can be increased without using it, a large amount of information can be transmitted without performing information compression even in data communication.

In the present invention, the exchange 2 can determine a channel to be allocated according to the current channel usage rate and give the determined channel to the mobile terminal 1, so that effective channel utilization can be achieved.

[0016] Further, in the present invention, switch 2 to the mobile terminal which has said plurality of channels are allocated when it exceeds channel utilization in a plurality of channels communicating the threshold, less allocated Ji <br/> Yaneru number Can be controlled so that

[0017] From the viewpoint of further effective use of the frequency, a change in the channel used during communication is recognized.
When the line has been congested, automatically reduce the number of switch Yaneru
It has a function of switching as quickly as possible.

[0018]

FIG. 2 shows an embodiment of the exchange 3 as a base station higher-level device shown in FIG. 1. In this embodiment, a switching unit 31 and a line control unit 32 are provided. Has been
The multiplexing / demultiplexing device 31 further includes an amplifier 311 for amplifying a demodulated signal (data) from the base station 2 and three arithmetic devices 312 to 314 that commonly receive an output signal of the amplifier 311.
And one control signal from the line control unit 32
Arithmetic unit 312 calculates timing signal for A channel assignment
To timing generator 31 to be given to
5, and a timing generator 316 that also generates a timing signal for allocating a plurality of TDMA channels in response to a control signal from the line control unit 32 and supplies it to the arithmetic units 312 to 314.

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 FIGS.

First, the mobile terminal 1 notifies the line control unit 32 of the outgoing radio status report (1) shown in FIG. 3 from the base station 2 via a control channel (not shown) in order to set up a call.

FIG. 4 (a) shows an embodiment of the transmission radio status report.
And includes a message type, a mobile station type, a reception level, the number of zone selections, a perch channel number, a reception level, etc., and whether or not the mobile station type is a multi-channel call request terminal. Is shown. Note that the mobile terminal 1 may always report that it is a multi-channel call request terminal when performing the outgoing radio status report,
Alternatively, the configuration may be such that the user can select a single channel or a plurality of channels by using a button or a switch.

As described above, when the outgoing radio status report (1) is sent from the mobile terminal 1 to the line control unit 32 in the call setting,
As shown in FIG. 3 as usual, by performing call setting acceptance (2) and authentication request (3) to mobile terminal 1, authentication response (4) is sent from mobile terminal 1 to line control unit 32. Therefore, in response to this, the line control unit 32 further performs a level measurement request (5), so that a level measurement response (6) is given from the mobile terminal 1 to the line control unit 32.

At this point, the line control unit 32 determines whether or not the outgoing radio status report (1) is a terminal that desires multiple channel allocation as shown in step S1 of FIG. That is, when the terminal desires single channel allocation, single channel allocation (step S
Perform 2).

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

The radio channel designation (7) is composed of a message type, a frequency code, a slot number, a color code, a scramble code, a mobile station maximum transmission power, channel information and the like as shown in FIG. The slot number among these specifies a single slot (channel).

After the wireless channel designation (7) is performed, the line control unit 32 calls the mobile terminal 1 (8).
A response (9) is performed, and a response confirmation (10) is performed from the mobile terminal 1 in response to the communication (1).
1) will be realized.

Then, the line control unit 32 controls the timing generator 315 to give a timing signal to the arithmetic units 312 to 314 so that the TDMA channel assignment is one channel.

On the other hand, when it is determined in step S1 of FIG. 5 that the mobile terminal 1 is a terminal to which a plurality of channels are to be allocated, it is determined from the current line usage rate whether or not a channel is actually free. When only one channel is vacant, the above-described single channel allocation (step S
2), but when a plurality of channels are available, T
A plurality of channels are allocated within the multiplicity of the DMA channel (step S4).

In this multiple channel allocation, the same operation as in the above 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 to control the plurality of TDs.
Generating a timing signal for MA channel assignment;
This is given to each of the arithmetic units 312 to 314. Further, when the number of allocated channels differs depending on the mobile terminal, a timing signal corresponding thereto is provided to each of the arithmetic units 312 to 314. In this case, a plurality of channels of the same mobile terminal have the same frequency, but a different frequency is assigned to each mobile terminal.

Thereafter, the line controller 32 determines whether the demodulated signal is data or voice (step S5). If the demodulated signal is voice, the line controller 32 drives a CODEC (not shown) to execute normal voice processing (step S6). ), When it is determined that the data is data, the data is passed through 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 not basically related to the present invention, and thus description thereof is omitted.

The above-mentioned sequence shown in FIG. 3 shows a sequence when a call is arbitrarily transmitted from the mobile terminal 1, but FIG. 6 shows a general call from the line control unit 32 to the mobile terminal 1. 20 shows a sequence at the time of receiving an incoming call at the mobile terminal 1 when the mobile terminal 1 performs the paging (20). ) Is performed.

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

That is, the identification number of the mobile terminal is inserted into the reception identification number in the reception radio status report (21), and whether to request a multi-channel call or a single-channel call as the mobile station identification. Is specified and notified to the line control unit 32.

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

Thus, the mobile terminal 1 calls (8) and responds (9), and confirms the response (1) from the line controller 32.
0) starts the communication (11) between them.

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

That is, the line control unit 32 constantly monitors the channel usage rate (step S21), and determines whether the monitored channel usage rate exceeds a threshold value in step S2.
Judge with 2.

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

FIG. 8 shows the switching sequence to the single channel assignment. First, when the channel control unit 32 issues a channel release request (31) to the mobile terminal 1,
In response, the mobile terminal 1 returns the confirmation (32) to the line controller 32.

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

[0042]

As described above, according to the mobile communication system according to the present invention, a mobile terminal has a function of requesting a plurality of channels to be allocated. In the exchange on the side, a plurality of arbitrary channels are allocated to the same mobile terminal within the possible range of the multiplicity of TDMA channels in the same radio frequency, so that the number of allocated channels is increased for one subscriber. Data communication time can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a flowchart showing a sequence at the time of calling from a mobile terminal in the mobile communication system according to the present invention.

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

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

FIG. 6 is a flowchart showing a sequence at the time of an incoming call when a mobile terminal receives a paging call in the mobile communication system according to the present invention.

FIG. 7 is a diagram showing the contents of an incoming radio 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 for a mobile communication system according to the present invention.

FIG. 9 is a diagram specifically illustrating a channel switching sequence in a line control unit used for a 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 Switching network NW network The same reference numerals indicate the same or corresponding parts.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 14-7/26 102 H04Q 7/00-7/38 H04J 3/00-3/22

Claims (5)

(57) [Claims] 1. A mobile communication system comprising a mobile terminal, a base station for relaying a signal from the mobile terminal, and a base station host device located on an upper side of the base station, wherein the mobile terminal requests allocation of a plurality of channels. Has the function of
When the mobile terminal requests the plurality of channels,
The base station host apparatus transmits a plurality of channels within the same radio frequency within the time division channel multiplexing number to the mobile terminal.
A mobile communication system characterized by allocating an arbitrary plurality of channels as much as possible . 2. A mobile communication system comprising a mobile terminal, a base station for relaying a signal from the mobile terminal, and a base station host device located on the upper side of the base station, wherein the mobile terminal requests a plurality of channels to be allocated. Has the function of
When the mobile terminal requests the plurality of channels,
The base station host apparatus transmits a plurality of channels within the same radio frequency within the time division channel multiplexing number to the mobile terminal.
A mobile communication system characterized by arbitrarily allocating a plurality of channels as much as possible, and determining the number of channels to be allocated to the mobile terminal according to a radio channel usage rate. 3. A mobile communication system comprising a mobile terminal, a base station for relaying a signal from the mobile terminal, and a base station host device located on an upper side of the base station, wherein the mobile terminal requests allocation of a plurality of channels. Has the function of
When the mobile terminal requests the plurality of channels,
The base station host apparatus transmits a plurality of channels within the same radio frequency within the time division channel multiplexing number to the mobile terminal.
Of these, arbitrarily assigning a plurality of channels as much as possible , and when the radio channel usage rate exceeds a threshold, control to reduce the number of assigned channels to the mobile terminal to which the plurality of channels are assigned. A mobile communication system characterized by the following. 4. A mobile terminal for use in a mobile communication system comprising a mobile terminal, a base station for relaying a signal from the mobile terminal, and a base station higher-level device located above the base station, wherein a plurality of channels are allocated. a plurality of the same radio frequency and a function of requesting, when within division channels multiplicity number
A function of performing communication using the plurality of channels when any of a plurality of channels is assigned as much as possible among the channels . 5. A base station host device used in a mobile communication system comprising a mobile terminal, a base station for relaying a signal from the mobile terminal, and a base station host device located above the base station, wherein the mobile terminal A base station host apparatus having a function of allocating any of a plurality of channels within the same radio frequency within the time-division channel multiplexing frequency to a possible range .