JPH09135202A - Communication channel control server - Google Patents

Abstract

(57) Abstract: In a wireless communication system that performs multi-channel communication such as voice + video, it is possible to prevent a limited number of channel resources from being unilaterally occupied by a specific mobile station and to connect a large number of mobile stations. Provided is a communication channel control server that prioritizes that. A communication channel management unit manages the usage status of communication channels. When a new connection is requested from the mobile station in the state where there is no free channel, the mobile station using a plurality of channels is searched, the disconnectable channel is extracted from the channels in use by the communication attribute, and the connection is disconnected. When the communication channel is disconnected in this way, a connection for a new request is established on that channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system composed of a plurality of base stations and mobile stations under the control of each base station, in which voice data and non-voice data are transmitted by a mobile station using a communication channel. The present invention relates to a communication channel control server for controlling a communication channel via a base station.

[0002]

2. Description of the Related Art In recent years, with the advancement of advanced information technology, as a mobile communication system capable of effectively utilizing a radio frequency band,
PHS (Personal Handy Phone: Second Generation Cordless Telephone System) is in the practical stage. Also, this P
TDMA / TDD (Time Division Multiple Access) in HS
/ Time Division Duplex) data transmission, there is a tendency to realize "video wireless telephone".

In addition to the conventional wireless communication using a mobile phone, the video wireless phone enables the display of the other party to be heard by a display provided on the mobile phone during a call.
In addition, it is possible to realize highly convenient wireless communication by displaying a map on the display and explaining it by voice to inform the other party of the call of his / her location. Furthermore, it is possible to display the document on the display and explain it by voice so that the other party of the call can understand what is difficult to convey with words alone.

Although the video wireless telephone has such convenience, in order to realize this, the voice and the moving image must be transmitted on separate channels. This is because moving images have a heavy transmission load. In PHS, a carrier wave in each frequency band of the radio is divided into time slots at predetermined time intervals. A pair of up and down time slots constitutes a radio channel having a transmission rate of 32 kbps, and voice and moving images can be transmitted independently on this radio channel.

By thus transmitting audio and moving images using separate wireless channels, a video wireless telephone can be realized. By the way, when wireless traffic increases due to such parallel transmission of video and audio, incoming and outgoing calls must be restricted, and the connection request is accepted only when there is a free channel. Paying attention to such a problem, for example, in Japanese Patent Laid-Open No. 5-252103,
In a digital car telephone system for performing data and digital voice communication, a radio base station monitors a use state of a radio transmission path with a car telephone terminal, and at the time of traffic congestion, the car telephone terminal makes a voice call. A technique has been proposed in which the signal transmission speed on the wireless transmission line is reduced to half the normal transmission / reception at that time.

An example of the digital mobile radio communication system in this publication will be described below. The digital mobile radio communication system of this publication is a mobile telephone terminal (hereinafter referred to as M
SS1), a radio base station (hereinafter MBS2), and a car telephone exchange (hereinafter MSC3). The MSS1 transmits / receives a signal to / from the MBS2 via a wireless channel (hereinafter referred to as TRX11), and a digital-analog converter (which performs analog conversion by halving the amount of input information when the input information is digital voice). Below D / A12)
And a control unit for controlling the TRX11 and D / A12 (hereinafter C
TL23) and. MBS2 is MSS1
TR that sends and receives signals to and from the wireless channel
X21, a CTL23 that monitors the usage state of the wireless channel and instructs the half rate start if the input information is digital voice during high traffic, and a compression unit that compresses the transmission data to the TRX21 in half by the half rate start instruction ( The following HRT22) is provided. In addition, MSC3
Is connected to the MBS 2 via a wired transmission line and makes an exchange connection for outgoing and incoming calls.

The operation of the digital mobile radio communication system configured as described above will be described below. First, when the MSS1 makes a call, the MBS2 receives a call signal, and the CTL 23 determines whether or not the wireless channel is under traffic congestion. Here, if the traffic is low, C
The TL23 sends a call signal to the MSC3, and when receiving a response signal from the MSC3, two channels (for example, 16 Kb)
ps × 2) is allocated and a call signal is transmitted / received between the called party of MSC3 and MSS1 at a normal transmission rate. When traffic congestion is determined, the CTL 23
The half rate request signal is transmitted to S1. C in MSS1
Determine if TL23 can be half rate.
If the communication is data communication, half rate is not possible,
MBS2 that has transmitted a disable signal to MBS2 and received it
Then, send a call restriction signal to MSS1 to restrict the call,
Allocate two channels to make calls without halving the transmission rate. Since half rate is possible for voice communication, CT
L23 sends a possible signal to MBS2. And CTL
23 transmits a half rate start signal to MSS1. Then, the CTL 23 releases one unused channel (16 Kbps) of the two channels, that is, one channel (16
Kbps), and instructs the HRT 22 to compress the audio data. In the MSS1, the CTL 23 receives the half rate start signal and halves the amount of input information to the D / A 12 to perform analog conversion. As a result, a call signal is transmitted and received between the MSS1 and the MBS2 at a half rate, that is, at a half transmission speed (Japanese Patent Laid-Open No. 5-2521).
03 publication).

[0008]

However, according to the above-mentioned conventional technique, the number of slots time-division multiplexed in the PHS is four in one base station in the PHS, so that it is subordinate to the wireless communication system. If some mobile stations carry out parallel transmission of voice and moving images through two communication channels, there is a problem that the communication channels become congested.

As described above, since the wireless channel is congested due to the video wireless telephone, there is a problem that a new connection cannot be established even if there is an urgent matter to report. In addition to the video wireless telephone, when voice and different information are assigned and transmitted and received in two communication channels, the communication channel is congested, and the same problem occurs.

Further, in the configuration disclosed in Japanese Unexamined Patent Publication No. 5-252103, only a mobile station which newly performs voice communication at the time of traffic congestion halves the number of channels used and communicates at a half rate. One-sided channel occupation cannot be prevented. The present invention provides a communication channel control device that prevents unilateral occupation of wireless channels by parallel transmission and prioritizes connection of voice calls with high real-time characteristics in a wireless transmission system that performs multi-channel communication such as voice + data. That is.

[0011]

In order to solve this problem, the communication channel control server of the present invention has a communication channel in which voice data is transmitted and a communication in which non-voice data is transmitted in parallel transmission. The control channel is managed and the voice data transmission is controlled to be prioritized over the non-voice data transmission.

This makes it easy to accept a new call setting for voice data transmission even when voice-non-voice data is transmitted in parallel.

[0013]

A communication channel control server according to a first aspect of the present invention is a wireless communication system composed of a plurality of base stations and mobile stations subordinate to each base station, and one mobile station performs one communication. Channel control for controlling, via a base station, transmission of voice data using a communication channel and parallel transmission of voice-non-voice data performed by one mobile station by allocating voice and non-voice to two communication channels Management that manages a communication channel that is a server that transmits voice data, a communication channel that transmits non-voice data in parallel transmission, and a mobile station that is transmitting data on these communication channels. Means and any of the subordinate base stations receive a communication request from the mobile station, determine an available communication channel and notify the base station of the determined available communication channel. If there is no first communication means and a free communication channel, the management channel of the management means is referred to, and the communication channel for transmitting / receiving the non-voice data and the movement for transmitting / receiving the non-voice data. A first judging means for judging a station and a disconnection of any one of the judged communication channels to a base station which has a judged mobile station as a subordinate, and to the base station which has received the communication request. A second notification means for notifying the disconnected communication channel is provided, and in a wireless communication system composed of a plurality of base stations and mobile stations subordinate to each base station, one mobile station is provided. The transmission of voice data by a station using one communication channel and the parallel transmission of voice-non-voice data performed by one mobile station by assigning voice and non-voice to two communication channels are performed via a base station. It has been made.
In this transmission, the management means divides the communication channel in which the voice data is transmitted, the communication channel in which the non-voice data is transmitted in the parallel transmission, and the mobile station which is transmitting the data in these communication channels. It is managed. When one of the subordinate base stations receives a communication request from the mobile station, the first notifying unit determines an empty communication channel and notifies the base station of the determined empty communication channel. When there is no available communication channel, the first determination means refers to the management content of the management means, and the communication channel in which the non-voice data is transmitted and received and the mobile station in which the non-voice data is transmitted and received. To be judged.

Any one of the determined communication channels is disconnected by the base station which controls the mobile station determined by the second notifying means, and is disconnected by the base station which has received the communication request. It has the effect of being notified of the communication channel. Further, in the communication channel control server according to claim 2, in the configuration according to claim 1, any one of the subordinate base stations performs parallel transmission of voice-non-voice data from the mobile station in the first notifying means. When the communication request of 1 is received, the first determination unit that determines the free communication channel by referring to the management content of the management unit, and if there is one free communication channel determined by the first determination unit, the non-voice A first refusal control unit that causes the base station to reject only a communication request for data; and a first notification unit that notifies the base station that has received the communication request of the free communication channel determined by the first determination unit. When any one of the subordinate base stations receives a communication request from the mobile station indicating that the voice-non-voice data is transmitted in parallel, the first determination unit controls the management content of the management unit. Is referenced and free Communication channel is determined. When there is one free communication channel determined by the first determination unit, the base station rejects only the communication request for non-voice data under the control of the first rejection control unit. Further, there is an effect that the free communication channel determined by the first determination unit is notified to the base station that has received the communication request by the first notification unit.

Further, in the communication channel control server according to a third aspect of the present invention, in the configuration of the second aspect, the second notifying means is the second notification means when the first determination means determines the non-voice data communication channel. A second notifying unit for instructing a base station that is under the control of the mobile station to disconnect the communication channel and notifying the base station that has received the communication request of the disconnected communication channel, and a non-voice data communication When the channel is not determined, a second rejection control unit that causes the base station to reject the communication request is provided.
When the determining unit determines the non-voice data communication channel, the second notifying unit instructs the base station subordinate to the mobile station to disconnect the communication channel, and receives the communication request. The disconnected communication channel is notified. When the communication channel for non-voice data is not determined, the second refusal control unit has the effect of causing the base station to reject the communication request.

According to a fourth aspect of the present invention, in the communication channel control server according to the third aspect, the second notifying means further determines a plurality of non-voice data communication channels by the first determining means. , An inquiry control unit that inquires the base station of the disconnection possibility of the mobile station that is transmitting data on those communication channels, and when the base station receives a response to the inquiry, the mobile station that responds that the disconnection is possible A second determination unit, and the second notification unit instructs the mobile station, which has responded that disconnection is possible, to disconnect on the communication channel, and the second rejection control unit, the mobile device which responded that disconnection is possible. When there is no station, the communication request is rejected by the base station, and when a plurality of non-voice data communication channels are judged by the first judging means, a question is asked. The combined control unit to the mobile station in the data transmission in those communication channels, or cleavable is caused to contact the base station.

When the base station receives the response to the inquiry, the second determining unit determines the mobile station that has responded that the disconnection is possible. If the second notification unit instructs the mobile station to disconnect and the disconnection on the communication channel is instructed, and the second rejection control unit does not respond to the disconnectable mobile station, the communication request is sent to the base station. Has the effect of being rejected by.

According to a fifth aspect of the present invention, in the communication channel control server according to the third aspect, the communication request for non-voice data includes disconnection permission / inhibition information indicating whether or not the communication channel can be disconnected. And the management means further comprises
The communication channel for transmitting the non-voice data is managed in association with the disconnectability information corresponding to the non-voice data information, and the second notifying unit further communicates the non-voice data by the first determining unit. When a plurality of communication channels are determined, a second determination unit is provided for determining whether or not the communication channels can be disconnected with reference to the management content of the management means.
The second notifying unit instructs the mobile station determined to be possible by the second determining unit to disconnect the base station under the control of the mobile station, and the second rejection control unit When there is no mobile station determined to be possible by the second determination unit, the communication request is rejected by the base station, and the management means is used for communication for transmission of non-voice data. A channel is managed in association with disconnection possibility information corresponding to the non-voice data information, and when a plurality of non-voice data communication channels are determined by the first determining means, the communication channel is disconnected. It is determined by the second determination unit whether or not it is possible by referring to the management content of the management means.

For the mobile station determined by the second determination unit to be possible by the second notification unit, the base station subordinate to the mobile station is instructed to disconnect the communication channel, and the second rejection control is performed. When there is no mobile station determined to be possible by the second determination unit by the unit, the communication request is rejected by the base station.

Further, in the communication channel control server according to claim 6, in the configuration of claims 1 to 5, the communication request for the voice data includes that the type of the request is voice, and the communication request for the non-voice data is performed. The request includes that the type of the request is non-voice data, and in the parallel transmission, the communication request for voice data and the communication request for non-voice data are both transmitted by the mobile station, and the management means Is all communication channels that are transmitting data, communication attributes that indicate whether the data that is being transmitted in each communication channel is voice data or non-voice data, and the transmission of data using these communication channels. When a base station under its control receives one or more communication requests from the mobile station, the storage means for storing the mobile station in association with the mobile station is communicating with each other. A detection unit that detects the requesting mobile station and the type of the request from the request; and a detection control unit that, when detected, causes the first notification unit to determine an empty communication channel for each communication request, When one or more communication channels are notified to the base station by the first or second notifying unit, the communication attribute of each notified communication channel is determined based on the communication identifier detected by the detecting unit. The communication channel is disconnected in the writing unit that writes the notified communication channel, the determined communication attribute, and the detected requesting mobile station in the storage unit in association with each other, and the subordinate base station. And a delete means for deleting the communication channel stored in the storage means, the communication attribute of the communication channel, and the mobile station transmitting and receiving data on the communication channel. All the communication channels that are transmitting data by the storage means, and communication attributes that indicate whether the data being transmitted in each communication channel is voice data or non-voice data. , Mobile stations transmitting data on these communication channels are stored in association with each other.

In this state, when any of the subordinate base stations receives one or more communication requests from the mobile stations, the requesting mobile station and the request type are detected by the detecting means from the respective communication requests. It When the communication request is detected, the determination control unit determines an empty communication channel in the first notification unit for each communication request. When one or more communication channels are notified to the base station by the first or second notifying unit, the communication attribute of each communication channel notified by the writing unit based on the communication identifier detected by the detecting unit. Is determined, and the notified communication channel, the determined communication attribute, and the detected requesting mobile station are associated with each other and written in the storage means.

When the communication channel is disconnected in the subordinate base station, the communication channel stored in the storage means, the communication attribute of the communication channel, and data transmission / reception on the communication channel are performed. It has an effect that the mobile station is deleted by the deleting means. The communication channel control server according to claim 7 is the mobile station according to any one of claims 1 to 6, wherein the communication channel control server is further instructed by the second notifying means to disconnect the communication channel for non-voice data. And a mobile station storing means for storing the mobile station, a second determining means for determining whether or not a free communication channel exists by referring to the management content of the managing means when the mobile station is stored, And a non-voice data transmission / reception instructing unit for instructing a base station under control of the mobile station stored in the mobile station storage unit to transmit / receive non-voice data in the communication channel. The mobile station storage means stores the mobile station for which the second notification means instructs the disconnection of the communication channel for non-voice data. . When the mobile station is stored, the second determination means refers to the management content of the management means at predetermined time intervals, and determines whether or not there is a free communication channel.

When there is a vacant communication channel, the base station subordinate to the mobile station stored in the mobile station storage means so that the non-voice data transmission / reception instructing means transmits / receives the non-voice data on the communication channel. It has the effect of being instructed. The communication channel control server according to claim 8 is the structure according to any one of claims 1 to 7, wherein the communication channel is a communication slot in a TDMA frame of each wireless carrier in the wireless communication system, and the management means is a TDMA frame. In each of the communication slots, the communication channels are stored with the slot numbers sequentially assigned from the beginning to the end, and the first and second notifying means notify the base station of the slot numbers indicating the communication channels. It is what

According to a ninth aspect of the present invention, there is provided the communication channel control server according to the eighth aspect, wherein the communication channel control server further includes calculation means for calculating a transmission error occurrence rate of each slot, and the calculated occurrence. Third determination means for determining a communication slot whose rate is equal to or higher than a predetermined reference, and when voice is transmitted / received in the determined communication slot and non-voice data exists in the voice, the non-voice data is transmitted / received. And a base station controlling the base station so that the voice transmitted / received to / from the subordinate mobile station in the communication slot having the slot number determined by the fourth determination means is non-voice. Disconnection control means for transmitting / receiving data at the slot number in which data is transmitted / received and disconnecting the connection on the communication slot determined by the third determination means. It is those that was characterized by Rukoto,
The calculation means calculates the transmission error occurrence rate of each slot.

When the communication slot whose calculated occurrence rate is equal to or higher than the predetermined reference is determined by the third determining means, the voice of the communication slot determined by the fourth determining means and the non-voice data are contained in the voice. The slot number being transmitted / received is determined. The disconnection control means controls the base station so that the voices transmitted and received by the mobile stations under the control of the communication slot having the slot number determined by the fourth determination means are transmitted and received at the slot number at which the non-voice data is transmitted and received. This has the effect of disconnecting the connection on the communication slot determined by the third determination means.

A communication channel control server according to a tenth aspect of the present invention is characterized in that, in the configurations of the first to ninth aspects, the non-voice data is moving image data. (Embodiment 1) A communication channel control apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a wireless communication system constructed by a communication channel control server.

The radio communication system in this figure is a PHS.
Base stations 11, 12, and 13 are installed, and these base stations 11, 12, and 13 are under the control of the communication channel control server. In addition, each base station 11, 12, 13
Has its own wireless zone and has a plurality of mobile stations under its control. In the present embodiment, under the control of each of the base stations 11, 12, and 13, mobile phone type mobile stations 31 and 32 (hereinafter, this mobile phone type mobile station is simply referred to as a mobile station). There is a videophone type mobile phone 33 having a camera and a display in the mobile phone type mobile station (hereinafter, this videophone type mobile station is referred to as a voice-video combined mobile station 33).
The voice-video combined mobile station 33 can display a video and transmit / receive video data in addition to the function of the mobile phone. That is, the video signal input from the camera 33b is compression-coded in accordance with ITU-T Recommendation H.261, and the coded video signal is transmitted as moving image data to another station via a radio channel via an antenna. Also, the moving image data transmitted from the other station through the wireless channel is received, the moving image data is expanded and decoded, converted into an analog image signal and displayed on the display 33a. As described in the prior art, different radio channels for transmitting moving image data and radio channels for transmitting audio data are assigned.

These mobile stations 31, 32, and 33 must first perform subscriber registration before communication with other mobile stations or terminal devices on other communication networks. In addition, it is necessary to register the location each time a new wireless zone is entered. Here, subscriber registration means that a mobile station as a subscriber receives a telephone number (hereinafter referred to as a PS number), and the mobile station acquires a unique PS number by the subscriber registration. It will be. Location registration is to register the PS number of the mobile station in the communication channel control server when the mobile station enters the wireless zone, and when the mobile station 31 is powered on or moved to a new wireless zone. When launched. By this location registration, the mobile station informs the communication channel control server of its existence, so that it becomes possible to receive the service provided by the communication channel control server.

Regarding the internal configuration of the base stations 11, 12 and 13 and the internal configuration of the mobile telephone type mobile stations 31 and 32, the base stations 11, 12 and 13 instruct the communication channel from the communication channel control server. Except for the points described above, there is no difference from the existing ones in the PHS, so the description of the internal configuration is omitted. In PHS, n-channel multi-carrier multi-carrier TDMA (time division multiple access) is adopted as an access method, and TDD (time division duplex) is adopted as a transmission method. The above method is based on RCR (Radio System Development Center)
It is standardized in the second-generation cordless telephone system RCRSTD-28 standard. The RCR (Radio System Development Center) is a basic technical condition such as standard specifications of radio equipment related to various radio utilization systems with the participation of radio equipment manufacturers, telecommunications carriers and users. Is a foundation that formulates the standard.

In the TDMA / TDD system, a radio channel represents a physical channel specified by a carrier and a specific time slot. FIG. 2 shows the relationship between the carrier number and the frequency band of the PHS carrier.
Shown in FIG. 2 is a diagram showing how the communication channels of the wireless communication system shown in FIG. 1 are configured. As shown in the figure, the frequency bands available for PHS are 1895.150Hz, 1895.450Hz, 1895.750Hz, 1896.050H.
z, 1896.350 Hz, 1896.650 Hz, 1896.950 Hz ... Are assigned, and the radio channels from slot 1 to slot 4 shown in the figure are formed in the carriers in these bands.

The wireless channel is roughly divided into a control channel and a communication channel functionally. The control channel is used for transmitting and receiving control signals such as location registration and call origination, and the communication channel is mainly used for transmitting and receiving information signals such as voice and data. Next, a description will be given with reference to the explanatory diagram of FIG. FIG. 3 is a diagram showing a relationship between a communication channel and a TDMA frame and a relationship between a TDMA frame and a slot.

In the PHS, the slots forming the TDMA frame are (uplink slots 1, 2, 3, 4,
Downlink slot 1, 2, 3, 4), uplink slot 1
If so, mobile station 31, if uplink / downlink slot 2, mobile station 32,
Each of the up and down slots 3 is assigned to the subordinate mobile station, such as the mobile station 33. This pair of up and down slots is a communication channel in PHS, and independent communication can be realized in these channels. Slot numbers 1 to 4 are assigned to the pair of upstream and downstream, and the communication channel is designated by this slot number.

Next, the communication channel (TCH) will be described with reference to the explanatory view of FIG. The TCH is time-division multiplexed in the same physical slot as the predetermined control channel. The control channel time-division multiplexed in the same physical slot as this TCH is SACCH (SLow Added Contr
ol CHannel) and is used for call setup and data link establishment.

Next, the frame structure, TCH and SACC
The relationship with H will be described with reference to the drawings. As indicated by reference numeral t0 in the figure, the physical slot of the layer 2 frame in the second-generation cordless telephone system includes the transient response ramp time R, the start symbol SS, the preamble PR, the channel type CI, and the SACCH. And T
The CH and CRC are time-division multiplexed in one physical slot. Of these, the SAC located in front of the TCH in FIG.
The CH forms one frame for two physical slots.

The SACCH layer 2 frame structure is as follows:
As indicated by reference numeral t1, the slot order bit is at the head, and after the slot order bit, reference numerals t2, t
As shown by 3, there are a layer 2 field and a layer 3 field. A message for call connection or call disconnection is transmitted / received between the base station and the mobile station using this layer 3 field. In PHS, SACC
In addition to H, FACCH (Fast Added Control CH) that can send and receive control information at high speed by spending one physical slot
annel) exists.

Next, the format of the call setup message will be described with reference to the explanatory diagram of FIG. FIG.
FIG. 3 is a diagram showing a call setup message and setting of characteristics of the call setup message in the present embodiment. The call setup message is a message for establishing a connection on the line in PHS layer 3. This call setup message is transmitted and received between the base station and the mobile station using the above-mentioned SACCH or FACCH. As shown in FIG. 4, the structure of the call setup message shows a transmission capability field, a content information length field, a calling number field in which the PS number of the mobile station of the transmission source is described, and the content length of the calling number. It comprises a content length field, a destination number field in which the PS number of the mobile station in the destination field is described, a content length field indicating the content length of the destination number, and a destination subaddress field.

This transmission capability field has a reference numeral y1.
As shown in, the transfer capability field, transfer capability content length field, coding standard field, information transfer capability field, transfer mode field, information transfer rate field, structure field, communication mode field, and call setup It comprises a modulo field, a symmetry field, an information rate field, a layer 1 field and a user information layer 1 protocol field.

It should be noted that it should be noted that the reference numerals y1 and y are notable in this figure.
2 is an information transmission capability field and a user information layer 1 protocol field shown in FIG. In RCR-STD28 standard,
Although only the settings for audio are specified in this field, in the present embodiment, in order to realize video transmission,
By specifying 5 bits of 00111 in this information transfer capability field, moving image transmission is specified.

Further, in the user information layer 1 protocol, in RCR-STD28, ITU-T Recommendation G.7 is used with 5 bits of 00100.
Although only 21 is specified, in the present embodiment, 0011
ITU-T Recommendation H.261 video transmission is defined by 5 bits of 1. <Internal Configuration of Voice-Video Combined Mobile Station 33> Next, the internal configuration of the voice-video combined mobile station 33 will be described with reference to the configuration diagram of FIG. FIG. 5 is a schematic block diagram showing the configuration of the voice / video combined mobile station 33. In the figure, each mobile station includes an antenna 40, a radio controller 41, a modulator 42, a demodulator 43, a communication controller 44, and a voice processor 4.
5, a video processing unit 46, and a key processing unit 47.

The radio controller 41 has a function of transmitting the modulated data supplied from the modulator 42 on a carrier wave and transmitting from the antenna 40, and a function of receiving a signal in a predetermined frequency band from the high frequency signals induced in the antenna 40. Have and. The radio control unit 41 sets a radio channel in the TDMA / TDD system according to a channel setting instruction given from the communication control unit 44, and switches between a transmission mode and a reception mode according to a transmission / reception switching instruction given from the communication control unit 44.

Modulation section 42 performs π / 4 shift QPSK modulation on the transmission data output from communication control section 44, and outputs the result to radio control section 41. The demodulation unit 43 includes the wireless control unit 41.
The signal received by is demodulated and given to the communication control unit 44. The communication control unit 44 includes a CPU, a ROM, a RAM and the like, and controls overall communication of the mobile station. The request for establishing a voice connection is made by writing 00000 in the information transfer capability field in the call setting transmission capability and by writing a bit value indicating ITU-T Recommendation G.720 in the user information layer 1 protocol. To establish a video connection, 00111 is written in the information transfer capability field in the call setting transmission capability, and I is set in the user information layer 1 protocol.
This is done by writing a bit value indicating TU-T Recommendation H.261. The communication control unit 44 makes a request for establishment of these two types of connections, and requests the communication channel control server for parallel transmission of audio-video.

The key processing unit 47 has a key which receives an input of an identifier of a transmission destination by pressing a key and detects on-hook or off-hook by pressing the key, a liquid crystal, and an LED. The voice processing unit 45 performs A / D on the input voice signal from the microphone by ADPCM / PCM (where PCM is pulse code modulation and ADPCM is adaptive differential PCM).
D-convert and output to the communication control unit 44. Communication control unit 44
The digital data output from the D / A converter is output to the speaker.

The moving picture processing section 46 compresses and codes the video signal input from the camera 33b in accordance with ITU-T Recommendation H.261, and outputs the coded video signal to the communication control section 44 as moving picture data. Further, the moving image data output from another station via the communication control unit 44 is expanded and decoded, converted into an analog image signal, and displayed on the display 33a.

<Internal Configuration of Communication Channel Control Server>
Next, the internal configuration of the communication channel control server will be described with reference to the configuration diagram of FIG. FIG.
FIG. 3 is a diagram showing an internal configuration of a communication channel control server. Base station interface 2, line i / f unit 3,
A channel management unit 4, a mobile station storage unit 5 for which a plurality of users desire to use,
It is composed of a control unit 6.

The base station interface 2 has an exchange function between base stations. The line i / f unit 3 is an interface for a communication network. As shown in FIG. 7, the channel management unit 4 manages the use status of communication channels in the wireless communication system by management information. FIG. 7 is a diagram showing management information managed by the channel management unit 4. In the present embodiment, the management information is the CS number of the base station with which the wireless communication system communicates (the CS number is a number assigned to each base station in PHS and corresponds to the PS number). , The PS number of the mobile station that is communicating, the communication channel used for communication, and the communication attribute. The communication channel in PHS is represented by a carrier number and a slot number. The communication attribute indicates whether the data being communicated is voice or moving image.

In the figure, a mobile station with a PS number of xx21 under the control of a base station with a CS number of xx11 is performing voice transmission using slot number 1 of carrier number 1. In addition, under the control of the base station with CS number xx12, the mobile station with PS number xx31 has the slot number 1 with carrier number 2.
Audio transmission is carried out in. Further, under the control of the base station with CS number XX12, the voice-video combined mobile station 33 with PS number XX33 transmits voice-video in parallel on the communication channel of slot number 3 of carrier number 2 and slot number 4. (In the figure, the mobile station 33 with combined audio-video)
The management information about is shaded with diagonal lines. ).

As described above, the use status of the communication channel of the wireless communication system is managed by the correspondence table of the management information. As shown in FIG. 8, the mobile station storage unit 5 for requesting plural use places the PS number of the mobile station in which the communication channel for moving image transmission is disconnected and the mobile station under it in order to prioritize voice transmission. The CS number of the existing base station is stored. FIG.
FIG. 3 is a diagram showing the stored contents of a mobile station storage unit 5 for which a plurality of users desire to use. The CS number and the PS number stored in this way are numbered as 1, 2, 3, ...

The control unit 6 has a flow chart shown in FIGS.
The communication channel control server is integratedly controlled. Hereinafter, the processing of the communication channel control server will be described with reference to the flowcharts of FIGS. FIG. 9 is a main flow chart showing the control contents of the control unit 6.
FIG. 10 is a flowchart showing the processing contents of the connection request reception processing. Further, FIG. 11 is a flowchart showing the processing contents of the wireless state deterioration detection processing.

In the following description, if the steps in the flow chart of FIG. 9 are step M, the flow chart of FIG.
Each step of each flow chart is distinguished from each other by using reference characters of different alphabets, such as step S for steps in the chart and step T for steps in the flow chart of FIG. <Main flow chart> The control unit 6 is always in step M
It is in the state of the loop processing of 1 to step M4. In this loop processing, it is monitored whether the base station receives the connection request (step M1) and the number of errors in each slot is calculated (step M2). Then, it is determined whether or not there is a slot in which the calculated number of errors is a predetermined number or more (step M3). If a mobile station is stored in the mobile stations desired to use multiple channels (step M4),
The presence / absence of a free channel is also referred to (step M7).

In this state, if the base station receives the connection request, the connection request receiving process is performed. If there is a slot in which the number of errors calculated in step M3 is greater than or equal to a predetermined number, a wireless condition deterioration detection process is performed (step M6). If there is a free communication channel in step M7, steps M8 and M9 are executed. Next, the establishment of the connection between the calling mobile station and the base station will be described with reference to the sequence diagram of FIG. FIG. 12 (a)
FIG. 8 is a sequence diagram showing a call connection process between a mobile station and a base station. When the mobile station goes off-hook, the mobile station sends a link channel establishment request b1 to the base station via the control channel. Upon receiving this request, the base station performs link channel allocation b2 and notifies the mobile station of the allocation result. After that, the mobile station and the base station transmit and receive the synchronization bursts b3 and b4 a predetermined number of times. After this, the mobile station and the base station set the asynchronous balanced mode setting command b5 (SABM),
UA (Unnumbered Acknowledgment) b6 is transmitted and received. After this, the mobile station uses the SACCH to send the call setup message b7 to the base station.

Next, the call connection processing will be described. This explanation is based on (1) when there are two or more free channels for both voice and video in the call setup, (2) when there is one free channel for both voice and video, and (3) when the call setup is If only voice and one free channel, (4) Call setting is only voice and no free channel, if there is a connection for video transmission, (5) There is no free channel in both voice and video for call setting, When there is a connection for video transmission, (6) Call setup is performed only for voice and there are no empty channels, and there is no connection for video transmission.

<(1) Both voice and video call setup have two or more free channels> When the subordinate base station receives both voice and video call setup request messages (step M1)
Referring to the management content of the channel management unit 4, it is determined whether or not there are two or more free channels (step S
1). Since they exist here, the carrier number and slot number of two communication channels among them are notified to the base station (step S2).

The sequence between the base station and the mobile station after this notification will be described with reference to the sequence diagram of FIG. 12 again. Upon receiving the notification, the base station sets the call setting acceptance message b8.
Send After the call setting acceptance is transmitted, the definition information request, the function request, and the authentication request are transmitted and received (these are omitted in the figure), and then the call message b11 and the response message b12 are transmitted to the mobile station (step S1).
1). After the mobile station receives these, a connection between the base station and the mobile station is established on the communication channel. Both audio and video are sent and received over this established connection. On the other hand, the control unit 6 reflects the connection information in the management information (step S10).

Specifically, the control unit 6 refers to the calling number field and the called number field in the call setup message received by the base station, and determines the PS number of the mobile station of the transmission source,
The PS number of the mobile station in the destination field is read. After reading these, the CS number of the base station that received the call setup message and the read PS numbers of the transmission source and the transmission destination are associated with each other. Further, the CS number-PS number combination is associated with the carrier number and slot number of the communication channel notified by the control unit 6.

Next, referring to the information transfer capability field and the user information layer 1 protocol field in the transmission capability of the call setup message, these fields are
Identifies whether it indicates ITU-T Recommendation G.720 or ITU-T Recommendation H.261. In this case, ITU-T Recommendation G.720
Therefore, the communication between the base station and the mobile station is voice, and the communication attribute is determined to be voice. When the communication attribute is determined in this way, voice management information is formed in the channel management unit 4.

<(2) Both voice and video call setup have one free channel> When the subordinate base station receives a call setup request for both voice and video, refer to the management contents of the channel management unit 4. It is determined whether or not there are two or more free channels (step S1). Since it does not exist here, it is determined whether or not the received call settings are two of voice and moving image (step S2). Since the call settings are audio and video,
The base station is instructed to reject the call setting for the moving image (step S3).

After the refusal instruction, it is determined whether or not there is one free channel (step S4). 1 free channel
Since only the communication channel is used, the base station is notified of the communication channel (step S9). The notified base station is
A connection is established on the communication channel, and both audio and video are transmitted and received on this connection. On the other hand, the control unit 6 reflects the connection information in the management information (step S10).

Specifically, by referring to the calling number field and the called number field in the call setup message received by the base station, the PS number of the mobile station of the transmission source and the PS number of the mobile station of the transmission destination field are referred to. And read out. After reading these, the CS of the base station that received the call setup message
The numbers are associated with the read PS numbers of the transmission source and the transmission destination. Further, the CS number-PS number combination is associated with the carrier number and slot number of the communication channel notified by the control unit 6.

Next, referring to the information transfer capability field and the user information layer 1 protocol field in the transmission capability of the call setup message, these fields are
Identifies whether it indicates ITU-T Recommendation G.720 or ITU-T Recommendation H.261. ITU-T Recommendation G.720 Base Station-
Communication between mobile stations is voice, so the communication attribute is determined to be voice. According to ITU-T Recommendation H.261, the communication between the base station and the mobile station is a moving image, so the communication attribute is decided to be a moving image.

In this case, in the base station, the above field is IT
Call setup set in U-T Recommendation G.720 and ITU-T Recommendation H.2
Since the call setting set in 61 is received, the voice communication attribute is determined for the management information of one call setting, and the video communication attribute is determined for the management information of the other call setting. To be done. When the communication attribute is determined in this way, two types of management information of voice and moving image are formed in the channel management unit 4.

<(3) Voice setting is only voice, and there is one free channel> When the subordinate base station receives a voice call setting request,
Referring to the management content of the channel management unit 4, it is determined whether or not there are two or more free channels (step S
1). Since it does not exist here, it is determined whether or not the received call setups are voice-video (step S).
2). Since only voice is available, it is determined whether or not there is one free channel (step S4). Since they exist, the carrier number and the slot number of one communication channel among them are notified to the base station (step S9). The notified base station establishes a connection on the communication channel and transmits and receives both voice and video on this connection. On the other hand, the control unit 6 reflects the connection information in the management information (step S10). <(4) Call setting is audio only, no empty channel is available, and there is a connection for video transmission> Next, referring to the explanatory diagrams of FIGS. 14 to 16, call setting is audio only, no empty channel, and video transmission is used. The case where there is a connection will be described. In FIG. 14, voice is transmitted and received on the communication channels of slot 1 to slot 3. Video is transmitted and received on the communication channel of slot 4. In this state, it is assumed that the base station requests a new call setup indicated by the alternate long and short dash line.

When the subordinate base station 11 receives the voice call setup request message, it refers to the management content of the channel management unit 4 to determine whether there are two or more free channels (step S1). Since it does not exist here, it is determined whether or not the received call setup message is of two types, voice and moving image (step S2). Since only voice is available, it is determined whether or not there is one free channel (step S
4). Since there is no free channel, it is determined whether or not two connections are formed by the mobile station 33 for combined audio / video (step S5). If it is formed, only one channel in which a connection for moving images is formed by the mobile station 33 for combined voice / moving images is extracted (step S6). The disconnection of the extracted connection on the channel is instructed (step S7), and then the call disconnection will be described with reference to the sequence diagram of FIG. FIG.
2 (b) is a sequence diagram showing a call disconnection process between the mobile station and the base station.

Upon receiving the disconnection instruction, the base station 11
-The disconnection message c1 is transmitted to the mobile station 33 with moving picture. Upon receiving the disconnection message, the voice / video combined mobile station 33 transmits a release message c2 to the base station 11. The base station 11 that has received the release message c2 transmits a release completion message c3 to the voice / video combined mobile station 33. After the transmission, the base station 11 transmits the DISC command c4 to the mobile station 33 for combined audio-video. D
Mobile station 3 with voice-video combination that received ISC command c4
3 transmits the UA message c5. Upon receiving the UA message c5, the base station 11 transmits a wireless channel disconnection message c5 to the mobile station 33 for combined voice and video. Upon reception of this, the voice / video combined mobile station 33 transmits a wireless channel disconnection completion message c7 to the base station. By sending this disconnection completion message c7,
The connection between the base station 11 and the voice / video combined mobile station 33 is disconnected.

After the disconnection instruction, the control unit 6 stores the identifier of the disconnected mobile station in the mobile station storage unit 5 desiring to use a plurality of channels (step S8), and notifies the disconnected communication channel to the base station 11 ( Step S9). This step S5
The states from S9 to S9 are shown in FIG. In this figure,
The communication channel of slot 4 becomes an empty channel, and a new connection can be established here.
After this disconnection, the base station 11 is notified of the communication channel.

The notified base station 11 establishes a connection on the communication channel and transmits / receives voice data on this connection. On the other hand, the control unit 6 reflects the connection information in the management information. Specifically, voice
-Two kinds of management information of voice and moving picture are formed in the channel management unit 4 by the moving picture combined mobile station 33, but this moving picture side management information is deleted because the connection is disconnected. Instead of this, since a voice connection has been established in the communication channel in which a connection for moving images has been formed so far, the management information about this is reflected in the management content of the channel management unit 4.

This state is shown in FIG. In this figure, it can be seen that the communication channel of slot 4 is notified to the base station, and the mobile station 30 is transmitting and receiving voice data on this communication channel. <(5) Both voice and video call settings have no empty channels There is a connection for video transmission> When the subordinate base station receives both voice and video call setup requests, refer to the management contents of the channel management unit 4. Then, it is determined whether or not there are two or more free channels (step S1). Since it does not exist here, it is determined whether or not the received call settings are two of voice and moving image (step S2). Since it is both voice and moving image, the base station 11 is caused to reject the call setting communication for the moving image (step S3). afterwards,
It is determined whether or not there is one free channel (step S4). Since there is no free channel, it is determined whether or not two connections are formed by the mobile station 33 for combined audio / video (step S5). If formed,
A channel in which a connection for moving images is formed by the mobile station 33 for combined voice and moving images is extracted (step S
6). Next, the connection on the extracted channel is disconnected (step S7), the identifiers of the disconnected mobile stations are stored in the plurality of desired mobile station storage units 5 (step S8), and the base station is notified (step S9). The notified base station establishes a connection on the communication channel and transmits and receives voice on this connection. On the other hand, the control unit 6
Reflects the connection information in the management information.

<(6) Call setting is voice only No empty channel No connection for video transmission> When the subordinate base station receives a voice call setting request, it refers to the management content of the channel management unit 4 It is determined whether there are two or more channels (step S1). Since it does not exist here, it is determined whether or not the received call settings are two of voice and moving image (step S2). Since only voice is available, it is determined whether or not there is one free channel (step S
3). Since there is no free channel, it is determined whether or not two connections are formed by the mobile station 33 for combined audio / video (step S5). If it is formed, the channel in which the connection for moving picture is formed by the mobile station 33 for combined voice and moving picture is extracted (step S
6). Here, since there is no video connection, the base station rejects the call setup (step S1).
2).

<Detection of Radio Condition Deterioration> The radio condition deterioration process will be described with reference to the flowchart of FIG. 11 and the explanatory view of FIG. In FIG. 17, voice is transmitted and received on the communication channels of slot 1 to slot 3. Video is transmitted and received on the communication channel of slot 4. In this state, it is assumed that the radio condition of the communication channel of slot 3 deteriorates due to the interference of the communication channel between the base stations.

In the communication channel control server, the controller 6 counts the slot error of each communication slot (step M2). The slot error is a non-detection of a unique word in a slot or a CRC error, and if the number of these errors is equal to or more than a predetermined number, a radio condition deterioration process is performed (step M6). First, it is determined whether or not the state is deteriorated in the voice channel (the communication channel in which voice is transmitted and received) (step T1). Video channel (communication channel through which video is sent and received)
If so, the base station disconnects it (step T6). If it is an audio channel, it is determined whether or not the deteriorated channel is also used as the moving image channel (step T2).
If not, the process proceeds to step T6, but if it is also used, it is determined whether or not the moving image channel is good by referring to the count value in step M2 (step T3).
If it is bad, the process proceeds to step T6, but if it is good, the communication attribute switching request is transmitted by SACCH (step T4). This switching request includes the communication attribute of the change destination (voice in this case), and instructs the mobile station which data should be transmitted and received on a good communication channel (step T4). After the instruction, the attribute switching sequence is performed (step T5), and the communication channel whose state has deteriorated is disconnected (step T6).

<Attribute switching sequence> Next, FIG.
The attribute switching sequence will be described with reference to the sequence diagram of FIG. The control unit 6 that has determined the slot in which the slot error has increased causes the base station that has the communication channel of the slot under control to transmit the communication attribute switching request f1. Then, the synchronization bursts f2 and f3 are continuously transmitted to the mobile station 33 for combined audio-video. Voice-video combined mobile station 33 that receives continuous synchronization bursts
Similarly, the synchronization burst is continuously transmitted to the base station. After transmitting / receiving such a synchronization burst, the voice / video combined mobile station 33 transmits voice data f6, f7, f8 to the base station instead of the video data, and the base station also
Instead of moving image data, audio data is transmitted to the base station.

In this way, the base station disconnects the voice connection while the communication channel is being switched. <When mobile stations are stored in the mobile station storage unit 5 desiring to use more than one and the connection is disconnected in the base station> In order to prioritize voice transmission / reception, one of the voice-video combined mobile stations displays a movie. It is assumed that the connection that has been transmitted has been disconnected and that the voice-video combined mobile station 33 has been stored in the plurality of desired mobile station storage units 5.

In this case, the control unit 6 is
It is determined whether or not there is a free channel every predetermined time (step M4). Here, it is assumed that one of the mobile stations ends the call and the connection is disconnected. When an empty channel is generated by this disconnection, this is determined by the control unit 6 in step M7, and this mobile station is read (step M8). The control unit 6 notifies the base station subordinate to this mobile station of the idle channel, re-establishes the connection, and instructs the transmission of the moving image (step M9).

As described above, according to the present embodiment, since a specific mobile station uses a plurality of channels, a communication channel control mobile device newly wishing to connect cannot acquire a channel. The harmful effects of occupation can be eliminated. (Second Embodiment) In the second embodiment, the audio / video combined mobile station 33 is given the authority to permit / disallow disconnection. Therefore, in the second embodiment, when the communication channel in which the connection for the moving image is formed is extracted in step S6 in FIG. 10, the process shifts to step V1 in the flowchart in FIG. -Cha-
If it is determined Yes in step V3 of FIG. 10, the connection of the extracted communication channel is disconnected in step S7 of the flowchart of FIG. Step V
If No is determined in step 3, a call refusal message is transmitted to the base station in step S12.

The following is a description with reference to the flowchart of FIG. When the cleavable channel is extracted (step 6 in the flowchart of FIG. 10),
The control unit 6 controls all the voices currently communicating on the extracted channel.
-Send a channel disconnection inquiry notification on the SACCH or FACCH to the moving image combined mobile station (step V1).
The channel disconnection inquiry notification is a message for inquiring of the voice / video combined mobile station 33 as to whether or not the disconnection is permitted. The permission / disapproval of this is made by transmitting a message such as a channel disconnection inquiry response. When a channel disconnection inquiry response is transmitted from the voice / video combined mobile station 33, it is determined which voice / video combined mobile station 33 permits disconnection (step V2). If all the voice-video combined mobile stations 33 are not permitted (step V3), step S in the flowchart of FIG.
Proceed to 12. When any one of them notifies the permission, the process proceeds to step S7 in the flowchart of FIG. 10 and the base station is instructed to disconnect.

The operation of the mobile station 33 for combined voice and video will be described below with reference to the flowchart of FIG. From the communication channel control server device via the base station, the communication control unit 44 in the voice / video combined mobile station 33.
Receives the channel disconnection inquiry notification via the demodulation unit 43 and the wireless control unit 41, reproduces the warning voice stored in advance in the ROM in the voice processing unit 45, and issues a disconnection inquiry to the user. Is notified (step V4). Then, the user inputs a key to obtain a response as to whether or not the user accepts the disconnection (step V5). This is received via the key processing unit 34, and the communication control unit 44
Transmits a response indicating permission / non-permission as a channel disconnection inquiry response to the communication channel control server (step V6).

As described above, according to this embodiment,
-At the same time as eliminating the one-sided channel occupancy caused by the mobile station with video, at the same time giving the permission for disconnection / non-permission to the mobile station with voice-video to prevent the existing communication from being forcibly damaged. You can Further, it is possible to prevent the channel from being unnecessarily occupied by using the inquiry as a warning about the channel occupation.

(Third Embodiment) In the third embodiment, whether or not the available channel can be disconnected is registered, and whether or not the disconnection is permitted is determined based on this. Therefore, Embodiment 3
Then, in the management information managed by the channel management unit 4, for the communication channel to which the communication attribute of the moving image is added,
As shown in FIG. The availability of disconnection, which indicates the availability of disconnection, is added. In FIG. 21, carrier 2, slot number 2
The communication channel in which the moving image is transmitted is set to “Yes” for disconnection, and the communication channel in which the moving image is transmitted for carrier 3 and slot number 4 is set to “No” for disconnection.
Is set to

In the third embodiment, the voice / video combined mobile station 33 obtains the registration that the user permits the disconnection by the key input of the user, and transmits the disconnection channel registration notification to the base station. Next, description will be made with reference to the flowchart of FIG. In the step in FIG. 10, when the communication channel in which the connection for the moving picture is formed is extracted, the process proceeds to step V7 of this flow chart, and in step S7 of this flow chart, Ye
If it is determined to be s, the connection of the extracted communication channel is disconnected in step S7 of the flowchart of FIG. If No is determined in step 22 of the flowchart of FIG. 22, a call refusal message is transmitted to the base station in step V8.

When the voice / video combined mobile station 33 using a plurality of channels is detected (step S6 in the flowchart of FIG. 10), a channel registered as disconnectable is searched for based on the management information. (Step V7 in the flowchart of FIG. 22). If there is a disconnectable channel (Yes in step V7), the flow advances to step S7 in the flowchart of FIG. If not (N in step V7
o), the process proceeds to S12 in the flowchart of FIG.

As described above, according to this embodiment,
-At the same time as eliminating the adverse effect of channel occupancy due to parallel transmission of the video-combined mobile station 33, at the same time as voice-video-combined mobile station 33
The side is given permission / disapproval of disconnection to prevent the existing communication from being forcibly impaired, and the permission / disapproval of disconnection is mainly given to the user to improve the usability. Although the first to third embodiments have been described above, it goes without saying that the present invention can be implemented in various forms unless the gist thereof is changed. For example, the following modifications (a) to (e) can be made.

(A) In the first to third embodiments, the layer 3 confirmation (connection management, mobility management, etc.) performed by the base station is given to the communication channel control server, and only the layer 1 and layer 2 of the base station are provided. May be configured to be expandable. In this case, the scale of the wireless communication system can be increased by adding a communication interface in which only the layer 1 and the layer 2 of the base station are mounted in the PC card, and the expandability is enhanced.

(B) In the second embodiment, the inquiry as to whether or not the channel is to be disconnected is used to judge whether or not the channel can be disconnected. However, the calling side voice-video combined mobile station 33 has authority over the communication. Therefore, the above-mentioned inquiry may be made only to the calling-side voice-video combined mobile station 33 that is currently communicating. (C) In the second embodiment, the user's response to the disconnection inquiry is acquired, and the permission / non-permission notification corresponding to the response is transmitted to the base station. However, the inquiry is notified to the user and a default response instruction is issued at the same time. It may be passed and a corresponding channel disconnection inquiry response may be transmitted to the base station.

(D) In the second embodiment, the voice / moving image combined mobile station acquires the response of the user to the disconnection inquiry. However, a voice recognition technique may be used to acquire the response. (E) In the third embodiment, the disconnection permission is obtained by the user's key input, but the voice processing unit may use voice recognition technology to obtain the registration.

[0084]

As described above, according to the communication channel control server according to the first aspect, since a specific position such as a voice-video combined mobile station uses a plurality of channels, a new connection is made. It is possible to eliminate the adverse effects of channel occupation, such as the desired mobile station not being able to acquire the channel. Therefore, it is possible to transmit and receive voice and non-voice data while suppressing obstacles to communication between communicators.

Further, according to the communication channel control server of the second aspect, since the connection for voice is established when the number of free channels is one, the real-time property of voice can be maintained. . Further, according to the communication channel control server of the third aspect, if a communication channel for non-voice data is not determined, a new communication request is rejected, so that an existing call made in the wireless communication system is unnecessarily. It will not be disconnected.

Further, according to the communication channel control server according to the fourth aspect, the connection is disconnected only to the mobile station that responds that the non-voice transmission can be disconnected, so that the existing communication is forced. It can prevent damage.
In addition, it is possible to prevent the channel from being unnecessarily occupied by using the inquiry as a warning about the channel occupation.

Further, according to the communication channel control server of the fifth aspect, since the connection is disconnected only for the communication channel managed to disconnect the non-voice transmission, the existing communication is forced. It is possible to improve the usability by preventing the loss and making the timing of cutting possible mainly by the user. Further, according to the communication channel control server of the sixth aspect, since the management content of the management means dynamically changes by writing and deleting in the storage means, the communication channel control server is used for communication of the wireless communication system. It is possible to accurately grasp the channel usage status.

Further, according to the communication channel control server of the present invention, since the base station is instructed to the free channel which is stored in the mobile station storage means and can be used by the mobile station, the channel resource to be used is It is possible to prevent unnecessary resources from becoming free resources. Further, according to the communication channel control server of claim 8, since the communication channel is managed in slot units, the management of the communication channel suitable for the mobile communication system such as PHS using the TDMA / TDD method is performed. Can be realized.

Further, according to the communication channel control server of the ninth aspect, when a plurality of channels are used, the deteriorated communication channel can be smoothly switched to the good communication channel. The real-time property of can be prioritized over the video.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a wireless communication system constructed by a communication channel control server.

FIG. 2 is a diagram showing how communication channels of the wireless communication system shown in FIG. 1 are configured.

FIG. 3 is a diagram showing a relationship between a communication channel and a TDMA / TDD transmission / reception slot and a slot configuration.

FIG. 4 is a diagram showing a call setup message and setting of characteristics of the call setup message according to the first embodiment.

5 is a diagram showing an internal configuration of a voice / moving image combined mobile station 33 shown in FIG. 1. FIG.

FIG. 6 is a diagram showing an internal configuration of a communication channel control server.

7 is a diagram showing management information managed by a channel management unit 4. FIG.

FIG. 8 is a diagram showing stored contents of a mobile station storage unit 5 for which a plurality of users desires to use;

FIG. 9 is a main flow chart showing the control contents of the control unit 6.
It is.

FIG. 10 is a flowchart showing the contents of a connection request receiving process.

FIG. 11 is a flowchart showing the processing contents of wireless state deterioration detection processing.

FIG. 12 (a) is a sequence diagram showing a call connection process between a mobile station and a base station. (B) A sequence diagram showing a call disconnection process between a mobile station and a base station.

FIG. 13 is a sequence diagram of an attribute switching sequence.

FIG. 14 is an explanatory diagram illustrating a connection request reception process.

FIG. 15 is an explanatory diagram illustrating a connection request reception process.

FIG. 16 is an explanatory diagram illustrating a connection request reception process.

FIG. 17 is an explanatory diagram illustrating an attribute switching process.

FIG. 18 is an explanatory diagram illustrating an attribute switching process.

FIG. 19 is a flowchart showing the control contents of the control unit 6 in the second embodiment.

FIG. 20 is a flowchart showing the control contents of the communication control unit 44 of the voice / video combined mobile station in the second embodiment.

FIG. 21 is a diagram showing management contents of a channel management unit 4 according to the third embodiment.

FIG. 22 is a flowchart showing the control contents of the communication control unit 44 of the audio / video combined mobile station in the third embodiment.

[Explanation of symbols]

 2 base station I / F section 4 channel management section 5 multiple desired use mobile station storage section 6 control section 11 base station 12 base station 13 base station 31 mobile station 32 mobile station 33 voice / video combined mobile station 40 antenna 41 radio control section 42 modulation unit 43 demodulation unit 44 communication control unit 45 audio processing unit 46 moving image processing unit 47 key processing unit

Claims (10)

[Claims] 1. A wireless communication system comprising a plurality of base stations and mobile stations subordinate to each base station, wherein one mobile station transmits voice data using one communication channel and one mobile station A communication channel control server for controlling, via a base station, parallel transmission of voice-non-voice data by allocating voice and non-voice to two communication channels, the communication channel transmitting voice data. , A communication channel in which non-voice data is transmitted in parallel transmission, a management means for managing a mobile station that is transmitting data on these communication channels, and one of the base stations under the control from the mobile station. When the communication request is received, there is no first communication means for judging an empty communication channel and notifying the base station of the judged empty communication channel. If it is not, the first determination means for determining the communication channel in which the non-voice data is transmitted and received and the mobile station transmitting and receiving the non-voice data is determined by referring to the management content of the management means. Second notifying means for instructing a base station that has the determined mobile station under its control to disconnect any one of the communication channels, and notifying the base station that has received the communication request of the disconnected communication channel. A communication channel control server comprising: 2. The first notifying unit refers to the management content of the managing unit when any of the subordinate base stations receives a communication request from the mobile station indicating that parallel transmission of voice-non-voice data is received. A first determination unit that determines an empty communication channel and a first determination unit that causes the base station to reject only a communication request for non-voice data when there is one empty communication channel determined by the first determination unit. The communication channel control according to claim 1, further comprising: a rejection control unit and a first notification unit that notifies the base station that has received the communication request of the free communication channel determined by the first determination unit. server. 3. The second notifying means, when the first determining means determines a communication channel for non-voice data, instructs the base station that has the mobile station to disconnect the communication channel. And notifying the disconnected communication channel to the base station that has received the communication request.
The communication channel control server according to claim 2, further comprising a notification unit and a second rejection control unit that causes the base station to reject the communication request when the communication channel of the non-voice data is not determined. 4. The second notifying means further disconnects the mobile station, which is transmitting data on these communication channels, when a plurality of non-voice data communication channels are judged by the first judging means. A base station that inquires of the base station, and when the base station receives a response to the inquiry, the base station determines a disconnectable second mobile station. Is instructed to disconnect in the communication channel, and the second rejection controller causes the base station to reject the communication request when there is no mobile station that responded that disconnection is possible. The communication channel control server according to claim 3. 5. The communication request for non-voice data includes disconnection permission / inhibition information indicating whether or not the communication channel can be disconnected, and the management unit further includes a communication channel for transmission of non-voice data. Is managed in association with the disconnectability information corresponding to the non-speech data information, and the second notifying unit further determines that a plurality of non-speech data communication channels are determined by the first determining unit, A second determination unit that determines whether or not the communication channel can be disconnected with reference to the management content of the management unit is provided, and the second notification unit is provided to the mobile station that is determined to be possible by the second determination unit. for,
If the mobile station determines that the mobile station is under the control of the disconnection in the communication channel, and the mobile station determined to be possible by the second determination section does not exist, the second rejection control section issues the communication request. 4. The communication channel control server according to claim 3, wherein the base station rejects the communication. 6. The communication request for the voice data includes that the type of the request is voice, and the communication request for the non-voice data includes that the type of the request is non-voice data. In the transmission, a communication request for voice data and a communication request for non-voice data are transmitted together by the mobile station, and the management unit transmits all communication channels in data transmission and each communication channel. A communication attribute indicating whether the data inside is voice data or non-voice data,
Storage means for associating and storing mobile stations transmitting data on those communication channels, and when one of the subordinate base stations receives one or more communication requests from the mobile stations, respective communication is performed. When the requesting mobile station and the detecting means for detecting the type of the request are detected from the request, a determination control means for causing the first notifying means to determine an empty communication channel for each communication request, When one or more communication channels are notified to the base station by the first or second notifying unit, the communication attribute of each notified communication channel is determined based on the communication identifier detected by the detecting unit, A writing unit that writes the notified communication channel, the determined communication attribute, and the detected request-source mobile station in the storage unit in association with each other, and a communication channel in the subordinate base station. When the disconnection is performed, the communication channel stored in the storage unit, the communication attribute of the communication channel, and the deleting unit that deletes the mobile station transmitting / receiving the data on the communication channel are provided. The communication channel control server according to any one of claims 1 to 5, characterized in that: 7. The communication channel control server further stores a mobile station storing means for storing a mobile station for which a disconnection of the communication channel for non-voice data is instructed by the second notifying means, and a mobile station is stored. And second determination means for determining whether or not there is a free communication channel by referring to the management content of the management means at predetermined time intervals, and, if there is a free communication channel, non-voice in the communication channel. 7. The communication according to claim 1, further comprising: non-voice data transmission / reception instructing means for instructing a base station under the control of the mobile station stored in the mobile station storage means to transmit / receive data. Channel control server. 8. The communication channel is a communication slot in a TDMA frame of each wireless carrier in a wireless communication system, and the management means is a slot number sequentially assigned from the beginning to the end in each communication slot of the TDMA frame. 8. The communication channel control server according to claim 1, wherein the communication channel is stored in the communication channel, and the first and second notifying means notify the base station of the slot number indicating the communication channel. . 9. The communication channel control server further comprises calculation means for calculating a transmission error occurrence rate of each slot, and third judging means for judging a communication slot whose calculated occurrence rate is equal to or greater than a predetermined reference. Voice is being sent and received in the determined communication slot,
In addition, when non-voice data exists in the voice, fourth determination means for determining the slot number in which the non-voice data is transmitted / received, and the base station is controlled so that the mobile station under the control of the fourth determination means Disconnection control means for transmitting / receiving the voice transmitted / received in the communication slot having the determined slot number at the slot number in which the non-voice data is transmitted / received, and disconnecting the connection on the communication slot determined by the third determination means. The communication channel control server according to claim 8, further comprising: 10. The communication channel control server according to claim 1, wherein the non-voice data is moving image data.