JP3173552B2 - Communication control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a communication mode in which two terminals for transmitting and receiving data after transcoding data by an adapter are connected to a plurality of exchanges, such as from automatic voice communication to personal computer communication during automatic calling and talking. The present invention relates to a communication control method in a communication network in which terminals can be changed and terminals using different coding schemes can coexist.

[0002]

2. Description of the Related Art FIG. 4 shows a digital mobile radio communication network using a conventional communication control method. Now, the mobile radio terminal 11 is connected to the exchange 1 via the radio communication line 12 and the radio control line 13.
4, the mobile radio terminal 15 communicates with the switching center 22 via the radio communication line 16 and the radio control line 17, and the mobile radio terminal 18 communicates with the exchange 22 via the radio communication line 19 and the radio control line 21, respectively. It is assumed that it is possible.

A wireless terminal 11 converts a speech signal into a radio-coded speech signal using a speech coding scheme A, and performs a reverse process on the codec 23a, and converts a data signal into a radio-coded data signal using a data coding scheme B. The wireless terminal 15 includes an encoding system A codec 25a and an encoding system B adapter 26b, and the wireless terminal 18 includes an encoding system C codec 27c. And an encoding system D adapter 28d.

The exchange 14 has a codec 29a for converting a radio coded voice signal of the voice coding system A into a wire coded voice signal and performing the reverse process, and a radio coding system of the data coding system B. An adapter 31b for converting the data signal into a wired encoded data signal and performing the reverse process;
A codec 32c that converts a wirelessly encoded audio signal of the audio encoding system C into a wired encoded audio signal and performs the reverse process, and converts the wirelessly encoded data signal of the data encoding system D into a wired encoded data signal. A plurality of adapters 33d for converting and performing the reverse process are provided.
Similarly, the exchange 22 has a coding system A codec 34 for performing mutual conversion between a wireless coded signal and a wired coded signal.
a, a plurality of adapters 35b of the encoding system B, a codec 36c of the encoding system C, and a plurality of adapters 37d of the encoding system D are provided.

The control circuit 38 of the exchange 14 has a selector 39
To control the wireless line and the codecs 29a, 32c,
Connection with any one of the adapters 31b and 33d and the non-conversion path 41, a communication line 42s with the exchange 22 and a control line 42
c, its call line 42 s and codec 29 a,
32c, adapters 31b and 33d, and connection control with any of the non-conversion paths 41, and other control necessary for exchange connection. The coding system determination circuit 43 of the exchange 14 determines an encoding system used by a terminal connected to the exchange 14 via a wireless line. The same selector 4 is provided to the exchange 22.
4, a non-conversion path 45, a control circuit 46, and an encoding method determination circuit 47.

Now, when a communication request from the radio terminal 11 to the radio terminal 15 is sent to the exchange 14 via the radio control line 13, the control circuit 38 of the exchange 14 sends the call to the originating terminal 1
1. The home memory (not shown) is accessed in order to know each service area of the receiving terminal 15, the service received by each terminal, the encoding method used, and the like. The obtained voice coding scheme of the transmitting terminal 11 is determined by the coding scheme determination circuit 4.
3 and the selector 39 is controlled to maintain the wireless communication line 12 with the wireless terminal 11 in an empty codec of the determined coding system and to transmit a ringing tone to the wireless terminal 11. Also, based on the obtained information on the receiving terminal 15,
The lines 42s and 42c to the exchange 22 are set up, and the call request is notified to the exchange 22. At this time, the information from the home memory is used to confirm that the coding schemes of the terminals 11 and 15 are the same. Know, let me know this too. Exchange 22
Calls the wireless terminal 15. When receiving a response from the wireless terminal 15, the exchange 22 controls the selector 44 to connect the wireless communication line 16 to the vacant non-conversion path 45, and notifies the exchange 14 of the connection, and the exchange 14 Upon receiving the notification, the selector 39 is controlled to connect the wireless communication line 12 to the vacant non-conversion path 41. As a result, non-coding communication of voice or data is performed between the terminals 11 and 15.

On the other hand, when a communication request from the wireless terminal 11 to the wireless terminal 18 is sent to the exchange 14 via the wireless control line 13, the same processing is performed in the exchange 14, but the code used by the wireless terminals 11 and 18 is used. The encoding schemes are different from each other, and the exchange 14 also notifies the exchange 22 of the encoding scheme of the terminal 11 . When the exchange 22 calls the wireless terminal 18 and receives a response from the terminal 18, the exchange 22 controls the selector 44 by the control circuit 46 to control the empty codec 36c.
(Or the adapter 37d) and the wireless communication line 19, and the exchange 14 receiving the connection notice
9a and the wireless communication line 12 are connected (or the empty adapter 31b is connected to the wireless communication line 12).
Communication is performed between the wireless terminals 11 and 18 through code conversion of voice (or data) twice.

Conventionally, when a mobile radio terminal calls a fixed network terminal to perform data communication, the following procedure has been used. That is, as shown in FIG. 5, a call originating request is sent from the mobile radio terminal 11 through the radio control line 13 to the exchange 1.
4, the exchange 14 receiving the transmission request issues an incoming call request to the other party's fixed terminal, for example, the exchange 64 of the fixed network in which the personal computer center 60 is accommodated. The fixed network exchange 64 issues an incoming call request to the other party's incoming fixed terminal 60. As a result, a ringing tone is returned from the exchange 64. The fixed exchange 64 returns the returned ringing tone to the mobile radio terminal 11. Therefore, the user of the terminal 11 knows that the calling is being performed by hearing the ringing tone. From the moment when the user of the fixed terminal 60 answers the incoming call, an answer carrier for carrier negotiation is transmitted from the terminal, in this example, a terminal of the personal computer center, to the fixed network exchange.

On the other hand, the fixed network exchange 64 notifies the mobile terminal 11 of the incoming call response from the fixed terminal 60 via the exchange 14. The mobile terminal 11 receives this and the terminals 11 and 60
Becomes a voice call state. When the terminal 11 confirms the reception of the response from the terminal 60, that is, when the terminal 11 enters the voice communication state,
If the automatic transmission is set, a communication mode change request is sent to the exchange 14. If the automatic transmission is not set, the user manually operates to send a communication mode change request. The exchange 14 that has received the request uses the information included in the communication mode change request to determine the adapter 24 b of the terminal 11.
, The corresponding adapter 31b is selected and activated, and the required setting is performed on the adapter 31b. When the setting is completed, the exchange 14 notifies the terminal 11 of the completion of the setting. Activate the adapter 24b. After the exchange 14 notifies the terminal 11 of the completion of the setting, when the adapter 31b prepares for activation, the fixed terminal 6
The oligonucleotide carrier is sent from the adapter 31b to the fixed terminal 60 for carrier negotiation with 0. When the fixed terminal 60 receives this, the fixed terminal 60 has already completed the preparation for activation and has transmitted the answer carrier. Therefore, when the original carrier is received, a communication state is established between the two terminals.

[0010]

In the above-described conventional communication control method, the communication mode is changed during communication between two wireless terminals, that is, a change from voice communication to data communication such as facsimile communication or personal computer communication. If the request to make a change is made from the wireless terminal to the exchange, the processing is performed when the home memory is accessed to know the encoding method of each terminal as in the processing at the time of the transmission request. It is not preferable to take such a long time because a call is in progress, and there is also communication with a fixed terminal. Therefore, the exchanges 14 and 22 determine whether communication is being performed with a mobile terminal or a fixed terminal. Control circuit 38,
46 controls the selectors 39 and 44, respectively, to control the wireless lines to be connected to the corresponding adapters (or codecs), respectively.
5 transmits the communication mode change response signal to the radio control lines 13 and 17.
Return each via.

Therefore, even if communication without code conversion is performed between the two wireless terminals 11 and 15 until a request for change of the communication mode is made from the wireless terminal, each switching center 14 after the request for change of the communication mode. , 22 in which the code is changed by the adapter (or codec). There is a drawback that performing the coding conversion twice in this manner results in deterioration of communication quality due to connection delay and coding distortion.

At the start of the first communication, whether the transfer is the code-less conversion transfer or the code conversion transfer is stored, and if there is a communication mode change request, the code stored earlier is also stored after the change. It is also conceivable to use the same transfer method depending on whether non-conversion transfer or code conversion transfer. However, since the combination of the codec and the adapter used by each terminal is not fixed, there are a plurality of types of speech coding codecs and data coding adapters in the communication network. In the case of communication, when the same voice coding method is used between both terminals, the communication is a signal transfer without code conversion, but the data communication is not limited to the code conversion and also differs between the two terminals. In the case of using the voice coding method, communication is performed by transferring signals by code conversion, but there is a problem that data communication is not necessarily code conversion communication.

Conventionally, as described with reference to FIG. 5, data communication (including facsimile communication and the like)
When the communication is performed from the beginning, a communication path for performing voice communication is first configured, and then a communication mode change request is issued to shift to data communication. For this reason, in the example of FIG. 5, when the fixed terminal (PC center) 60 responds to the incoming call request, the answer carrier is transmitted from this time. On the other hand, the originating terminal 11 confirms the response from the terminal 60 and issues a communication mode change request, which is received by the exchange 14 and captures its adapter 31b.
The originate carrier is sent from the adapter 31b to the fixed terminal 60 only after the start preparation is completed. Therefore, a considerable time elapses from the transmission of the answer carrier by the fixed terminal 60 to the reception of the originate carrier, and the transmission of the answer carrier of the fixed terminal 60 times out. In some cases, the formed communication path is released, and there is a problem that carrier negotiation becomes impossible and data communication becomes impossible.

[0014] In addition, when the voice communication state is entered, charging starts. However, the user should originally be charged for the time after the data communication is enabled. There is also a problem that useless charging is performed until the communication state is entered. The present invention provides a communication control method for realizing communication for transferring a signal without code conversion in a network in the case of data communication between mobile wireless terminals and when the same code conversion method is used between both terminals. The purpose is to:

Another object of the present invention is to provide a communication control method in which data communication becomes impossible and unnecessary charges are not made.

[0016]

According to the first aspect of the present invention, for each combination of two encoding systems, the signal transfer mode is a code conversion transfer mode in which code conversion is performed twice,
The switching center is provided with a signal transfer mode storage circuit that stores the code-non-conversion transfer mode in which the code conversion is not performed, and the switching station receives the signal from the terminal when a call is requested from the terminal or when a communication mode change request is made during communication. The coding information indicating the coding method is transmitted and received by the control signal between the exchanges, and the signal transfer form storage circuit is read with the coding information of both terminals. Transfer is performed. In the case of the code conversion transfer mode, code conversion signal transfer is performed, and communication between the terminals is performed in the communication mode in which the transmission request or the change request is issued.

According to the second aspect of the present invention, the adapter used in the terminal, that is, the coding information indicating the data encoding method is added to the transmission request from the terminal, and when the transmission request from the terminal is issued, the switching center is used. Sends a start signal to the control line in the exchange after completing the setting of the exchange adapter according to the encoding information included in the transmission request.

[0018]

FIG. 1A shows an embodiment of the present invention, in which parts corresponding to those in FIG. 4 are denoted by the same reference numerals. According to the present invention, the exchanges 14 and 22 are provided with a plurality of codecs and adapters respectively corresponding to the respective encoding systems, and also provided with a plurality of non-conversion paths. These can be freely connected to a wireless communication line by a selector. Further, in the present invention, the exchanges 14 and 22 are provided with signal transfer form storage circuits 53 and 54, respectively. The signal transfer form storage circuits 53 and 54 have the same contents, and according to the coding scheme used by the terminals communicating with each other,
Whether the communication between the terminals is a code conversion transfer mode in which code conversion is performed twice or a code non-conversion transfer mode in which code conversion is not performed is stored. For example, as shown in FIG. 1B, the codec coding method is A and A, B and B, C and C,
In the case of the same type as E and E , a code 0 indicating that it is a code-unconverted transfer mode is stored, and the coding method is A and C or C
In the case of E and E, a code 1 indicating a code conversion transfer mode
Is stored, and the coding method A and E store the code 0 which is a code-unconverted transfer form. Similarly, as for the data encoding method, either code 0 or 1 indicating the code-non-conversion transfer mode or the code-conversion transfer mode is stored for each of the two combinations.

Further, according to the present invention, coding information indicating a coding system used by the terminal is added to the communication mode change request signal. If the mobile radio terminals 11 and 18 request the exchanges 14 and 22 to change the communication mode during the communication between the mobile radio terminals 11 and 18, the call is transmitted. The exchange information of the communication mode change request received by the exchange 14 of the mobile radio terminal 11 on the side is notified to the exchange 22 of the mobile radio terminal 18 on the called side via the control line 42c. The control circuit 46 of the exchange 22 stores the coded information D in the communication mode change request from the terminal 18 and the coded information B of the terminal 11 received from the control line 42c in the signal transfer mode storage circuit 54. Read communication signal transfer mode "1",
This is notified to the control circuit 38 of the originating exchange 14.
In the case of this example, the control circuits 38 and 46 of the exchanges 14 and 22 control the selectors 39 and 44, respectively, and use the wireless terminals to the adapters 31b and 37d, respectively, because of the different data encoding schemes and the code conversion transfer mode. The wireless communication lines 12 and 19 of 11 and 18 are connected respectively,
2s to adapter 31 from codec 29a, 36c
Switching control to b and 37d is performed, and data communication is performed through two code conversions.

On the other hand, assuming that the originating mobile radio terminal 11 and the receiving mobile radio terminal 15 are, when the mobile radio terminals 11 and 15 request the exchanges 14 and 22 to change the communication mode during the communication between the mobile radio terminals. The exchange 14 of the originating mobile radio terminal 11 transmits the coded information B in the communication mode change request via the control line 42c to the exchange 22 of the called mobile radio terminal 15.
And the control circuit 46 of the exchange 22 on the terminating side
5, the signal transfer mode 0 of the communication stored in the signal transfer mode storage circuit 54 is read based on the coded information B in the communication mode change request from the terminal 5 and the coded information B of the terminal 11 from the control line 42c. This is notified to the control circuit 38 of the originating exchange 14. In this example, the exchange 1
4 and 22 control the selectors 39 and 44, respectively, so that the wireless terminals 11 and
18 and the wireless communication lines 12 and 16 respectively,
The switching control of the communication line 42s from the codecs 29a and 36c to the non-conversion paths 41 and 45 is performed, and code conversion is not performed, so that there is no signal delay and the signal quality is good.

When a terminal of a new encoding system comes to exist, the signal transmission mode for the combination of the encoding system and another encoding system is stored in the signal transfer mode storage circuits 53 and 54 of each exchange. . Of course, a corresponding codec or adapter will also be provided at each exchange. In the above description, the present invention is applied to the communication mode change during communication. However, even when communication is newly started, the coding information of the calling terminal is added during the calling request and the called terminal is changed during the incoming call response. The encoding information is added, and the originating exchange sends the encoding information of the originating terminal to the terminating exchange through the control line, and the originating exchange has the originating encoding information and the By reading the signal transfer form storage circuit from the coded information and sending the read contents to the originating exchange, the communication state of the code conversion transfer or the code non-conversion transfer can be set more quickly than in the prior art.

Next, an embodiment of the present invention will be described with reference to FIGS. In FIG. 2, parts corresponding to those in FIG. 1 are given the same reference numerals. In this case, the mobile terminal and the fixed terminal perform data communication. The exchange 14 is connected to a fixed network 64 through a communication line 62 and a control line 63, and the fixed network 64 accommodates the fixed terminal 60 through a line 65. ing. In this example, the fixed terminal 60 is a personal computer center. Further, in the present invention, during a transmission request from a mobile terminal, encoding information indicating an encoding method of an adapter of the terminal is added. This addition may use a portion originally existing in the transmission request format, or may change and add the configuration of the transmission request format.

Now, the mobile radio terminal 11 to the fixed terminal 60
Is transmitted to the exchange 14 through the radio control line 13, the control circuit 38 of the exchange 14
Accesses a home memory (not shown) to know the area in which the calling terminal 11 is located, the service that the terminal 11 is receiving, and the like. Then, “outgoing request (data)”
, And from the destination, the coding system determining circuit 43 determines that data communication with the fixed network is necessary and requires an adapter, and the switching center added to the "transmission request (data)". The adapter setting information 1 is transmitted to the vacant adapter 31b of the determined data encoding system, the adapter 31b is activated, and required information from the control line 13 is set therein. For example, when the partner terminal is a personal computer center, an AT command is set. Further, by controlling the selector 39, the wireless communication line 12 with the mobile wireless terminal 11 is connected to the adapter 31b, an adapter start start notification is sent to the terminal 11, and the exchange adapter setting information 2 is transmitted from the adapter 24b of the terminal 11. Is received through the communication line 12, and the adapter 31b is set with the information from the communication line 12. Upon completion of this setting, the adapter 31b completes preparations for carrier negotiation.

When the above setting for the exchange adapter 31b is completed, the exchange 14 sets up the communication line 62 to the fixed network 64 and notifies the incoming request to the fixed network 64 via the control line 63. Fixed network 64 receiving this notification
Calls the fixed terminal 60. In response, the fixed terminal 60 responds and sends the answer carrier to the fixed network 64. Since the exchange adapter 31b has already completed the preparation for carrier negotiation, carrier negotiation is performed immediately, and when an incoming response from the fixed terminal 60 reaches the mobile terminal 11, the data transfer state between the terminals 11 and 60 is established. become.

As described above, in the case of data communication, an incoming call request is issued to the fixed terminal after the preparation of the adapter of the exchange without connecting the voice call, so that a time out occurs and the incoming call cannot be made. This is not the case, and billing will be done after data transfer between terminals becomes possible.

[0026]

As described above, according to the first aspect of the present invention, when a mode change request is made during communication, by referring to the signal transfer form storage circuit with the coded information from both terminals, the short-circuit can be achieved. Time can be used to determine whether code transfer or codeless transfer is to be performed, and settings can be made based on that determination. High quality transmission can be performed without unnecessary code conversion and delay can be reduced. In addition, it is not necessary to use a codec or an adapter provided in the exchange as a set, and it can be used effectively. Also, depending on the combination, even if the voice (data) between the terminals is subjected to code conversion, the data (voice) may not be converted.

According to the second aspect of the present invention, data communication can be performed from the beginning of communication without configuring a voice communication path when data communication is started as described above, and the connection with a personal computer center is improved. The connection time is shortened, and unnecessary charges are eliminated.

[Brief description of the drawings]

FIG. 1A is a block diagram showing an example of a mobile communication system to which an embodiment of the present invention is applied, and FIG. 1B is a diagram showing an example of storage contents of a signal transfer mode storage circuit.

FIG. 2 is a block diagram showing an example of a system for connecting a mobile communication network and a fixed network to which an embodiment of the present invention is applied;

FIG. 3 is a diagram showing a processing procedure according to the embodiment of the invention of claim 2;

FIG. 4 is a block diagram showing a conventional mobile communication system.

FIG. 5 is a diagram showing a connection procedure of a conventional data communication.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H04Q 7/38 (72) Inventor Hisashi Shimizu 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communications Network Stock In-company (56) References JP-A-6-46009 (JP, A) JP-A-1-220924 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 14/00- 14/06 H04B 7/24-7/26 H04Q 7/04-7/38

Claims (2)

(57) [Claims] 1. A plurality of mobile radio terminals having at least one of a codec for performing voice code conversion and an adapter for performing data code conversion, a codec of a plurality of types of voice coding, and an adapter of a plurality of types of data coding. And a plurality of exchanges having a control circuit for controlling the transmission and reception of information between the mobile radio terminal and the exchange, and the transmission and reception of information between the exchanges, the mobile radio terminal and the exchange during, between switching centers and the switching center is a communication network connected by respective communication lines and control lines, if the encoding scheme is the same used for both mobile radio terminals communicating with each other Mu code between the two mobile radio terminal Communication of conversion,
If the coding schemes used by the two mobile radio terminals are different, the two exchanges accommodating the respective mobile radio terminals temporarily convert the codes into different codes, and perform communication by code conversion twice between the two mobile radio terminals. In the communication control method, the exchange stores, for each of the combinations of the two coding methods, whether the signal transfer form is a code conversion transfer form in which code conversion is performed twice or a code non-conversion transfer form in which code conversion is not performed. The signal transfer mode storage circuit is provided, and the switching center receives the signal received from the mobile wireless terminal at the time of a transmission request from the mobile wireless terminal, during communication, and at the time of a communication mode change request.
The mobile station transmits and receives coded information indicating the coding method of the mobile radio terminal using a control signal between the exchanges, and checks the signal transfer mode by referring to the signal transfer mode storage circuit with the coded information of both mobile radio terminals. for unsigned conversion transfer mode performs unsigned conversion signal transfer, in the case of the code conversion transfer mode performs code conversion signal transfer, the mobile radio <br/> terminal in the originating request and change the requested communication mode A communication control method characterized by performing communication between devices. 2. A plurality of mobile radio terminals each having a codec for performing voice code conversion and an adapter for performing data code conversion, an adapter for performing codec and data code conversion for performing voice code conversion, a mobile radio terminal, and transmission and reception of information between the switching center, and a control circuit for controlling transmission and reception of information between the switching center, the switching center for transcoding a data communication signal from the mobile radio terminal at the adapter, a mobile radio terminal and the switching center during, the communication control method in a communication network and a communication line and control lines respectively connecting between switching center, during origination request from a mobile radio terminal, by adding information indicating the adapter used in the mobile radio terminal transmitted, the mobile switching center that received the calling request from a mobile radio terminal, start setting the adapter of the switching center in response to the adapter information of the mobile radio terminal included in the calling request And, of the exchange
Connect the adapter and the mobile radio terminal with the above call line
To the exchange's adapter received from the telephone line.
Setting information to the adapter of the switching office that has been set up as described above,
After setting the information of the exchange's adapter,
A communication control method characterized by sending a call request for.