JP2001054163A - Data communication method for mobile communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data communication method for mobile communication terminal that can enhance a successful rate of data transmission even in the case that data link start sides are both mobile communication terminals. SOLUTION: In the case of transmitting data between data link start sides 1, 2 being mobile communication terminals, when the data link start side 2 cannot receive communication parameter setting acceptance from the opposite terminal (start 1-2), the data link start side 2 makes again a setting request of the communication parameter (start 2-4). Thus, even when a state of a radio wave is temporarily deteriorated due to fading or a weak electric field, since it is not required to conduct link release processing due to disabled control, the success rate of data transmission can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method, and more particularly, to a data communication method which is advantageously applied when both a data transmitting side and a data receiving side are mobile communication terminals.

[0002]

2. Description of the Related Art In recent years, as information devices have become smaller and lighter and the Internet has become widespread, it has become possible to easily exchange information by accessing a network even when away from home. As described above, when accessing a network while away from home, information can be exchanged anywhere regardless of where the PHS terminal or mobile phone is used as a communication means. In particular, a PHS terminal is suitable as this kind of communication means because it can transmit data at a higher speed than a mobile phone.

For example, when performing data transmission using a PHS terminal, unlike voice communication, in the case of data transmission, transmitted data must be accurately received by the other party. That is, in the case of a voice call, even if the voice of the other party is interrupted due to, for example, a decrease in received electric field strength or fading, it is possible to understand the content to some extent. However, in the case of data transmission, if the transmitted data is garbled and delivered to the other party, the value as information is completely lost. For this reason, in the case of data transmission, a protocol that defines the electrical and logical signal formats, transmission / reception procedures, error detection methods, and the like is required. As such a protocol, PHS terminals use PHS Internet
Access Forum Standard (PIAFS) has been defined. The transmission method of PIAFS is PHS 32 kbit /
s unlimited digital bearer or 64kbit / s
A transmission control procedure for transmitting data with high quality using an unrestricted digital bearer is provided.

[0004] PIAFS comprises an in-band negotiation procedure and an ARQ transmission procedure. The in-band negotiation procedure is a procedure for supporting future image transmission and a new transmission scheme in the future. Also, ARQ
The transmission control procedure is an error control procedure positioned at Layer 2 in the PHS communication phase. FIG. 5 shows two PHSs of the data link initiator 1 and the data link initiator 2
FIG. 9 is a sequence diagram showing an operation when data transmission by PIAFS is performed in a terminal. After the communication path between the two PHS terminals is formed, the process moves to PIAFS.
As shown in (1), the data link initiator 1 and the data link initiator 2 first perform ARQ synchronization processing. Next, the data link initiating side 1 and the data link initiating side 2 mutually make a communication parameter setting request, and upon receiving a setting request from each other, return a communication parameter setting acceptance.
Then, when receiving the setting reception of the communication parameter, the negotiation phase for establishing the synchronization with the setting request and the setting reception is ended, and the process shifts to the data phase to start data transmission.

[0005]

In such prior art, when one data link initiator receives the communication parameter setting reception and ends the negotiation phase, the other data link initiator similarly terminates the negotiation phase. If not, the data transmission processing (or reception processing) is started. That is, at the time of communication parameter negotiation, a control frame conflict occurs, and the communication parameter setting acceptance from the data link activation side 1 is transmitted to the data link activation side 2 as shown in FIG. If not received,
The data link activation side 2 sends a request for setting communication parameters to the data link activation side 1 again. On the other hand, since the data link initiator 1 has shifted to data transmission processing,
Attempt to execute data transmission processing continuously. For this reason, communication is not established between the data link activation side 1 and the data link activation side 2, and a timeout process occurs after 10 seconds, and a disconnection process for releasing the link is performed.

When both the data link initiator 1 and the data link initiator 2 are mobile communication terminals, the communication state of each terminal temporarily deteriorates after a communication path is formed due to the effects of fading, weak electric field, and the like. May be. However, in the related art, after such a communication path is formed, a communication procedure is not determined on the assumption that a communication state may be deteriorated in both terminals. That is,
In the prior art, the communication procedure mainly considered between a mobile communication terminal and a terminal connected to a fixed network. Therefore, when one terminal shifts to the data transmission process, the communication procedure is defined such that the other terminal also executes the data transmission process. For this reason, when one terminal cannot shift to data transmission processing due to the influence of fading, a weak electric field, or the like, there is a problem that control becomes impossible and shifts to link release (disconnection) processing.

The present invention solves such a problem of the prior art, and can improve the success rate of data transmission even when the data link initiator 1 and the data link initiator 2 are both mobile communication terminals. An object of the present invention is to provide a data communication method in a body communication terminal.

[0008]

According to the present invention, there is provided a data communication method between a first mobile communication terminal and a second mobile communication terminal. When a communication path for performing communication with the second mobile communication terminal is formed, a negotiation phase for establishing synchronization between the first mobile communication terminal and the second mobile communication terminal is started. When synchronization is established in the negotiation phase, the first mobile communication terminal and the second mobile communication terminal shift to a data phase for performing data transmission. At this time, after either one of the first mobile communication terminal and the second mobile communication terminal has shifted to the data phase, if it is detected that the communication terminal of the other party has not shifted to the data phase, Return to the negotiation phase and establish synchronization.

According to the present invention, in a data communication method in a mobile communication terminal, a key operation for performing data transmission is performed when a communication path with a partner communication terminal is formed and a voice call can be performed. When performed, synchronization is established for data transmission triggered by this key operation,
The specified data is transmitted after synchronization is established. And
When the data transmission is completed, the state automatically returns to the state where voice communication can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a data communication method in a mobile communication terminal according to the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, a PHS terminal to which a data communication method in a mobile communication terminal according to the present invention is advantageously applied will be described as an example. However, the present invention is not particularly limited to a PHS terminal. The present invention is applicable to data communication between communication terminals.

Referring to FIG. 2, there is shown a functional block diagram showing an embodiment when a data communication method in a mobile communication terminal according to the present invention is applied to a PHS terminal wirelessly connected to a PHS network. The PHS terminal shown in FIG. 2 is a terminal that can perform high-quality data transmission according to a protocol for performing data transmission such as PIAFS. That is, the PHS terminal transmits and receives, for example, a text message in a mail function and data transmission of an information device such as a personal computer connected to the terminal using a data transmission protocol.

In FIG. 2, an antenna 10 radiates or receives radio waves in order to exchange data with a radio base station (not shown) in a communication area. An RF unit 12 is connected to the antenna 10. The RF unit 12
An RF receiving circuit that amplifies and frequency-converts a signal received by the antenna 10 and outputs a demodulation signal to the baseband unit 14, and amplifies and frequency-converts a voice-modulated signal from the baseband unit 14 and outputs the signal to the antenna 10. And a transmission circuit. The baseband unit 14 has a CP
U16 and the codec 18, the CPU 1
Antenna 1 including voice signal and caller ID under control of 6
Modulation / demodulation of the received RF signal from 0 is performed.

The codec 18 is a converter that converts a digital signal into an analog signal and converts an analog signal into a digital signal. That is, the codec 18 is
6, the digital audio signal input from the baseband unit 14 or the CPU 16 is converted into an analog audio signal and output to the speaker (SP) 24, and the analog audio signal input from the microphone (MIC) 22 is converted into a digital audio signal. And outputs it to the baseband unit 14.
The codec 18 is also connected to a DTMF receiver 20, converts a digital signal input from the baseband unit 14 into an analog signal, and outputs the analog signal to the DTMF receiver 20.

The DTMF receiver 20 includes a codec 18
If the signal input from the DTMF signal is a DTMF signal, the content is output to the CPU 16. That is, the DTMF receiver 2
0, for example, upon receiving a DTMF signal keyed in from the caller, outputs that information to the CPU 16. CPU
A control unit 16 controls the entire PHS terminal.
ROM 16a and RAM 16b, which are non-volatile memories in which programs and the like are written, are built therein.
The RAM 16b stores data temporarily stored in performing the call processing, for example, various information such as the telephone number of the calling terminal received at the time of call setting. The RAM 16b also temporarily stores data for data transmission such as transmission data and reception data.

The received data temporarily stored in the RAM 16 b is stored in an E ² PROM 17 connected to the CPU 16.
And an information device (not shown) such as an external personal computer connected via the connector 19.
The E ² PROM 17 stores various data that are not deleted even when the power is turned off, such as a text message received by the mail function and registration data of the telephone directory. CP
U16 also includes a display unit 26 for displaying the telephone number and text message of the calling terminal, a numeric keypad for inputting the telephone number and text of the call destination, a power key for turning the power on and off, or a call process. A key input unit 28 composed of various keys such as a call key to be executed is connected.

The display unit 26 displays that data transmission is being performed when data transmission is being performed with the partner terminal according to the data transmission protocol, and also displays the fact that data transmission has been completed. When the data transmission ends, the speaker 24 notifies the speaker 24 of the end of the data transmission by voice or audible sound. Further, in the present embodiment, the key input unit 28 includes a trigger key for activating a data transmission protocol.

The data transmission procedure in the present embodiment provides various services for higher-level protocols.
These data transmission protocols and higher-level protocols are substantially performed by the CPU 16. The services provided by the data transmission protocol include “setting and release of a data link”, “providing an error-free transmission path by detecting / retransmitting an error”, “providing a full-duplex transmission path”, “flow control”, and “flow control”. There are "bit transparency", "communication of continuous relationship of continuous data", "providing high throughput channel under high bit error rate", and "fragmentation and assembly of text message".

FIG. 3 is a sequence diagram showing a flow of communication processing in the PHS terminal of the present embodiment. In FIG. 3, PS1 and PS2 are PHs in the present embodiment.
S terminal, and CS is a base station (and network). PS
When the call processing is performed from 1 and the telephone number of PS2 is transmitted to the network, the network issues a call request to PS2.
When PS2 responds to the incoming call request, the network establishes PS2.
Is notified to PS1, and a communication channel is formed by allocating a communication channel to each of PS1 and PS2.

As a result, PS1 and P
When a text message transmission / reception process is started during a call with S2 or a key operation for connecting an information device via the connector 19 and executing data transmission is performed, a data transmission protocol is started. From the voice communication mode for voice communication to the data transmission mode for data transmission. At this time, the display unit 26 indicates that the data transmission mode is being performed.

When the data transmission is successfully completed by the data transmission protocol, a data transmission completion notification is displayed on the display unit 26 and the speaker 24 outputs the notification. If the data transmission has failed, the display unit 26 displays that the data transmission has failed, and the speaker 24 outputs the fact. The display on the display unit 26 and the output from the speaker 24 can be arbitrarily set by the user, and it is a matter of course that only one of them can be notified. When the data transmission protocol ends, it is possible to automatically return to the call state, so that PS1 and PS2 can continue the call after the data transmission. Note that the call is made here first,
Since the transfer to the data transmission is performed halfway, the communication mode is automatically returned to the communication state. However, if only the data transmission is performed, the disconnection processing may be automatically performed after the data transmission.

FIG. 4 shows a more detailed sequence up to the start of the data transmission protocol in the sequence diagram shown in FIG. Note that in FIG.
Is a PHS base station that communicates with the PHS terminal PS1,
Other base stations that communicate with the network side and the PHS terminal PS2 are not abbreviated. PS1 and CS are STD-
The call connection process is executed according to the sequence of 28. That is, when PS1 performs a calling process after inputting the telephone number of PS2, a link channel establishment request is made to CS, and a link channel is assigned from PS to PS1. Then, a synchronous burst is performed during this time, and S
After ABM and UA, call setup is performed.

Thereafter, after the call setting, definition information, function request, authentication, etc. are exchanged between the PS1 and the CS, the called party terminal PS2 is called.
2, a communication path is formed. After the communication path is formed, PS1
, Synchronization is established with PS2, and in response to this, synchronization is accepted from PS2 with PS1. This allows ARQ
The synchronization process ends. When this synchronization processing is completed, a communication parameter setting request is made from PS1 to PS2 in order to establish synchronization next, and when PS1 receives a communication parameter setting acceptance from PS2, the establishment of synchronization is completed and PS1 becomes PS2. Send data.

FIG. 1 is a sequence diagram showing a detailed processing procedure of the data transmission protocol shown in FIG. In addition,
Here, PS1 in FIG.
Is the data link activation side 2. The data transmission protocol is performed between terminals, and the network side merely provides a communication path, so that it is not shown in FIG.
Further, in the following description, a case where data is transmitted from the data link initiator 1 to the data link initiator 2 will be described for easy understanding. The data in the data communication according to the present embodiment uses a large number of slots to reduce the data packet (data amount) to 32 k or 6 k.
Needless to say, 4k can be easily achieved.

When the data transmission protocol is started, the data link initiator 1 and the data link initiator 2 first transmit a frame for synchronizing the ARQ frame, and transmit the ARQ frame.
Perform synchronous processing. After the synchronization processing of the ARQ frame, the data link initiator 1 and the data link initiator 2 shift to a negotiation phase for establishing synchronization. When moving to the negotiation phase, the data link initiator 1
Sends a communication parameter setting request to the data link activation side 2 (activation 1-1). Similarly, the data link activation side 2 sends a communication parameter setting request to the data link activation side 1 (activation 2). -1).

When the data link activation side 1 receives a communication parameter setting request for activation 2-1 from the data link activation side 2, it returns a communication parameter setting acceptance (activation 1).
-2). Further, upon receiving the communication parameter setting request for activation 1-1 from the data link activation side 1, the data link activation side 2 returns a communication parameter setting acceptance (activation 2-2). When receiving the setting acceptance of the communication parameters of the activation 2-2 from the data link activation side 2, the data link activation side 1 shifts to a data phase in which data transmission is performed, and transmits to the data link activation side 2 using a data frame. The data is transmitted (activation 1-3).

On the other hand, at this time, the data link activation side 2 receives the communication parameter setting acceptance of activation 1-2 transmitted from the data link activation side 1 within a predetermined time due to, for example, fading or a weak electric field. If it is not possible, the data link initiator 1 will again accept the communication parameter setting.
(Startup 2-3). On the other hand, the data link activator 1 activates from the data link activator 2
When the communication parameter setting reception in step 3 is received, the next data transmitted in the start 1-3 is transmitted (start 1-
4).

When the data link activation side 2 receives the data of the activation 1-3 from the data link activation side 1, the data link activation side 2 transmits a communication parameter setting request to the data link activation side 1 in order to re-establish synchronization. (Start 2-4).
When the data link activation side 1 receives the communication parameter setting request of activation 2-4 from the data link activation side 2, the data number transmitted by itself and the data number transmitted by activation side 2 do not match. It is determined that the side 2 has not shifted from the negotiation phase to the data phase. Then, the data link activation side 1 transmits a communication parameter setting request to the data link activation side 2 in order to perform the negotiation phase again (activation 1-).
5).

When the data link activation side 2 receives the data of the activation 1-4, similarly to the activation 2-4, the data link activation side 2 requests the data link activation side 1 to set communication parameters (activation 2-5). Upon receiving the communication parameter setting request of activation 2-5, the data link activation side 1 returns a communication parameter setting acceptance to the data link activation side 2 (activation 1-6). Similarly, data link initiator 2 activates
Upon receiving the communication parameter setting request of -5, it returns a communication parameter setting acceptance to the data link activation side 1 (activation 2-6).

When receiving the communication parameter setting acceptance of the activation 2-6 from the data link activation side 2, the data link activation side 1 shifts to the data phase and uses the data frame to transmit the first data transmitted in the activation 1-3. To the data link initiator 2. When receiving the communication parameter setting acceptance of the activation 1-6 from the data link activation side 1, the data link activation side 2 shifts to the data phase and transmits data to the data link activation side 1 using a data frame (activation). 2-7). At this time, if there is no data to be transmitted from the data link activation side 2 to the data link activation side 1, only the data frame is transmitted. Thereafter, data transmission in the data phase is performed until the data transmission ends.

As described above, in the present embodiment, when the data link initiator 2 cannot receive the communication parameter setting acceptance from the initiator 1 in response to the communication parameter setting request transmitted to the data link initiator 1, the initiator 2 re-starts. Send a communication parameter setting request. Then, the data link activation side 1 transmits a communication parameter setting request to the data link activation side 2 in response to this request, so that it is possible to ensure the maintenance of communication between both terminals.

Therefore, when the control frame in the negotiation phase competes with the partner, the processing of the control frame from the partner is prioritized, so that the uncertain element of the communication can be eliminated. In addition, uncertain elements of communication in a wireless section (for example, deterioration of radio wave conditions such as fading and weak electric field) can be eliminated as much as possible. Furthermore, the accuracy of negotiations for data competition (congestion) and non-reception of data can be increased by setting communication parameters, so that the success rate of data transmission can be further increased.

Although the case where the data link activation side 2 cannot receive data has been described with reference to FIG. 1, it is needless to say that the same can be applied to the case where the data link activation side 1 cannot receive data.
In any case, the state of the activation side 1 or the activation side 2 is determined by determining the own transmission data number. That is, even if the communication channel is one,
Similarly, even if the number of channels is equal to or greater than the number of channels, the initiator 1 and the initiator 2 independently transmit the data number of the transmitted “request” in each channel when the “request” is not “accepted”. Or, if they recognize each other and the data number has not been updated, send "acceptance" to the request,
Establish communication more reliably. When the transmitted data numbers do not match, the data is transmitted up to the already transmitted data.

[0033]

As described above, according to the data communication method in the mobile communication terminal of the present invention, even when communication is temporarily interrupted due to deterioration of the radio wave condition due to fading, weak electric field, etc., control becomes impossible. Never release a link.
Therefore, it is possible to increase the success rate of data transmission between mobile communication terminals.

[Brief description of the drawings]

FIG. 1 is a sequence diagram showing an embodiment of a data communication method in a mobile communication terminal according to the present invention.

FIG. 2 is a functional block diagram when the mobile communication terminal according to the present invention is applied to a PHS terminal.

FIG. 3 is a sequence diagram showing an operation of the embodiment of the data communication method in the mobile communication terminal according to the present invention.

FIG. 4 is a more detailed sequence diagram before entering a data transmission protocol in FIG. 3;

FIG. 5 is a sequence diagram showing a data communication method of a mobile communication terminal according to the related art.

[Explanation of symbols]

10 antenna 12 RF unit 14 baseband section 16 CPU 16a ROM 16b RAM 17 E 2 PROM 18 CODEC 19 connector 20 DTMF receiver 22 microphone 24 loudspeaker 26 display unit 28 key input unit

Claims (8)

[Claims] 1. A data communication method between a first mobile communication terminal and a second mobile communication terminal, wherein a communication path for communication between the first mobile communication terminal and the second mobile communication terminal is provided. Is formed, a negotiation phase is established for establishing synchronization between the first mobile communication terminal and the second mobile communication terminal, and the first mobile communication terminal and the second mobile communication The terminal shifts to a data phase for performing data transmission when synchronization is established by the negotiation phase, and after any one of the first mobile communication terminal and the second mobile communication terminal shifts to the data phase, When the other communication terminal detects that it has not shifted to the data phase, it returns to the negotiation phase again and establishes synchronization. Data communication method in the terminal. 2. The data communication method according to claim 1, wherein after returning to the data phase, returning to the negotiation phase again and returning to the data phase, the data transmitted at the time of switching to the data phase is transmitted. A data communication method in a mobile communication terminal, characterized in that data transmission is performed from the beginning, including at the beginning. 3. The data communication method according to claim 1, wherein a communication path between the first mobile communication terminal and the second mobile communication terminal is formed, and data communication is performed after performing a voice call. A data communication method in a mobile communication terminal, wherein when a key operation for performing the key operation is performed, the negotiation phase and the data phase are executed by using the key operation as a trigger. 4. The mobile communication terminal according to claim 3, wherein when the data phase is executed and the data transmission is completed, the mode automatically shifts to the voice communication mode. Data communication method. 5. The data communication method in a mobile communication terminal according to claim 4, wherein when the data transmission ends, the end of the data transmission is notified by an audible or visible display. 6. A data communication method in a mobile communication terminal, wherein when a key operation for performing data transmission is performed when a communication path with a communication terminal of the other party is formed and a voice call can be performed, Establishing synchronization for performing data transmission with an operation as a trigger, transmitting specified data after establishing synchronization, and automatically returning to the state where the voice call can be performed when the transmission of the data is completed. A data communication method in a mobile communication terminal. 7. The data communication method in a mobile communication terminal according to claim 6, wherein when the transmission of the data is completed, the data transmission is notified by an audible or visible display. 8. The data communication method according to claim 6, wherein the mode for automatically returning to a state in which voice communication can be performed can be set in advance by a user using a key operation unit of the mobile communication terminal. Characteristic data communication method in a mobile communication terminal.