WO2007144927A1

WO2007144927A1 - Transmission control device and transmission control method

Info

Publication number: WO2007144927A1
Application number: PCT/JP2006/311725
Authority: WO
Inventors: Masato Ohkawa
Original assignee: Panasonic Corporation
Priority date: 2006-06-12
Filing date: 2006-06-12
Publication date: 2007-12-21

Abstract

It is possible to provide a transmission control device and a transmission control method capable of suppressing irregularities or a delay of video and audio even if the communication is temporarily interrupted by a handover or a weak electric field state and recovering the communication. The transmission control device includes: a communication control unit (22) for selectively communicating with a plurality of base stations and transmitting video data and audio data in a preset transmission unit; and an interruption detection unit (15) for detecting a period when the communication is temporarily interrupted. The communication control unit (22) discards the video data and the audio data of the period when the communication is temporarily interrupted.

Description

Specification

Transmission control apparatus and transmission control method

Technical field

TECHNICAL FIELD [0001] The present invention relates to a transmission control device and a transmission control method capable of recovering communication by suppressing disturbance and delay of video and audio even when communication is temporarily interrupted due to a handover or a weak electric field state. Is.

Background art

In recent years, the spread of mobile terminals and the advancement of technology have become one of the essential tools for our daily lives. Due to the high speed of communication speed, not only voice calls but also videophone and video distribution services have started and new multimedia services have started. In the future, the communication speed is expected to reach several hundred Mbps, and users will be able to enjoy applications and content similar to the current wired broadband network. However, in mobile communication systems, radio waves are the communication medium, and it is difficult to guarantee perfect quality under any circumstances. For example, communication is interrupted in places with poor signal conditions, and when a mobile terminal straddles multiple base stations, communication is temporarily interrupted due to handover.

[0003] In addition, video and audio data are compressed in order to effectively use a limited communication band, and encoded video and encoded audio data are transmitted / received, so that the quality is high and noise is affected. Benefit from being less. However, temporal correlation is used to dramatically increase the compression efficiency, and if there is a temporary disruption in communication due to handover or weak electric field conditions, data continuity is not guaranteed, and video disturbances occur. Or abnormal noise occurs.

[0004] In addition, in the conventional mobile communication system, video and audio data are temporarily stored in the buffer in the exchange and the buffer of the mobile terminal, causing a temporary interruption of communication due to handover or weak electric field conditions. Even at times, seamless data transmission is achieved (see, for example, Patent Document 1).

Patent Document 1: Japanese Patent No. 2999470 Disclosure of the invention

Problems to be solved by the invention

[0005] However, the conventional mobile communication system disclosed in Patent Document 1 has a buffer, which increases the manufacturing cost. Also, if video and audio data are accumulated while communication is interrupted and the buffer code and video data are transmitted during recovery, a delay corresponding to the time when communication was interrupted will occur. There was a problem that occurred.

[0006] The present invention was made to solve the conventional problem, and even if communication is temporarily interrupted due to a handover or a weak electric field state, the communication can be recovered by suppressing disturbance and delay of video and audio. It is an object of the present invention to provide a transmission control apparatus and a transmission control method that can be used.

Means for solving the problem

[0007] The transmission control device of the present invention selectively communicates with a plurality of base stations, detects a communication control unit that transmits data in a preset transmission unit, and a period during which the communication is temporarily interrupted. A disconnection detecting unit, wherein the communication control unit discards data during a period in which the communication is temporarily interrupted.

[0008] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

[0009] The transmission control device of the present invention includes an encoding unit that encodes audio data in the transmission unit and generates encoded audio data, and a buffer memory that temporarily stores the encoded audio data in the transmission unit. And an initialization unit capable of initializing the buffer memory, wherein the initialization unit transmits the encoded audio data generated during a period in which the communication is temporarily interrupted to the encoding unit. And the buffer memory is initialized.

With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, audio disturbance and delay can be suppressed.

[0011] The transmission control device of the present invention encodes audio data and video data in the transmission unit, generates a code key audio data and code key video data, and the code key. A buffer for temporarily storing audio data and the encoded video data in the transmission unit And an initialization unit capable of initializing the buffer memory, wherein the initialization unit generates the encoded speech data and the encoding generated during a period in which the communication is temporarily interrupted. The video data is discarded by the encoding unit, and the buffer memory is initialized.

[0012] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to suppress disturbance and delay in video and audio.

[0013] The transmission control method of the present invention detects a communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit, and a period during which the communication is temporarily interrupted. A disconnection detecting step, wherein the communication control step discards data during a period in which the communication is temporarily interrupted.

[0014] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

[0015] The transmission control method of the present invention encodes audio data in the transmission unit to generate encoded audio data, and temporarily stores the encoded audio data in the buffer memory in the transmission unit. And an initial key step capable of initializing the buffer memory, wherein in the initial key step, the encoding step is generated in the encoding step during a period in which the communication is temporarily interrupted. The encoded voice data is discarded and the buffer memory is initialized.

[0016] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, audio disturbance and delay can be suppressed.

[0017] The transmission control method of the present invention includes encoding steps for encoding audio data and video data in the transmission unit, and generating encoded audio data and encoded video data, and the encoded audio data. A storage step of temporarily storing data and the encoded video data in the transmission unit in the transmission unit; and an initialization step capable of initializing the buffer memory, wherein in the initial step, The encoded audio data and the encoded video data generated in the encoding step are discarded during a period in which communication is temporarily interrupted, and the buffer memory is initialized.

[0018] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, Disturbances and delays in video and audio can be suppressed.

[0019] The transmission control program of the present invention selectively communicates with a plurality of base stations to a computer to transmit data in a preset transmission unit, and the communication is temporarily interrupted. A disconnection detecting step for detecting a period, and in the communication control step, data in a period in which the communication is temporarily interrupted is discarded.

[0020] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

[0021] The transmission control program of the present invention encodes audio data in the transmission unit to generate encoded audio data, and temporarily stores the encoded audio data in the buffer memory in the transmission unit. A storage step for storing and an initial step capable of initializing the buffer memory, wherein the computer includes the initial step in which the communication is temporarily interrupted in the initial step. The encoded audio data generated in the encoding step is discarded, and the buffer memory is initialized.

[0022] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, audio disturbance and delay can be suppressed.

[0023] The transmission control program of the present invention encodes audio data and video data in the transmission unit to generate encoded audio data and encoded video data, and the encoded audio data And a storage step of temporarily storing the encoded video data in the buffer unit in the transmission unit, and an initial step capable of initializing the buffer memory. And a step of discarding the encoded audio data and the encoded video data generated in the encoding step and initializing the buffer memory in a period in which the communication is temporarily interrupted. Have.

[0024] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to suppress disturbance and delay in video and audio.

[0025] A computer-readable storage medium according to the present invention is a communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit to a computer. And a interruption detection step for detecting a period during which the communication is temporarily interrupted, and in the communication control step, transmission control for discarding data during the period during which the communication is temporarily interrupted. The program is recorded.

[0026] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

[0027] The computer-readable storage medium of the present invention includes an encoding step of encoding audio data in the transmission unit and generating encoded audio data, and temporarily buffering the encoded audio data in the transmission unit. A storage step of storing in a memory; and an initial input step capable of initializing the buffer memory, wherein the computer stores the communication in a period in which the communication is temporarily interrupted in the initial input step. It has a configuration in which a transmission control program for discarding the encoded audio data generated in the encoding step and initializing the buffer memory is recorded.

[0028] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, audio disturbance and delay can be suppressed.

[0029] The computer-readable storage medium of the present invention includes an encoding step of encoding audio data and video data in the transmission unit to generate encoded audio data and encoded video data, and the encoded audio data. And a storage step of temporarily storing the encoded video data in the buffer unit in the transmission unit, and an initial step of initializing the buffer memory. Recording a transmission control program for discarding the encoded audio data and the encoded video data generated in the encoding step and initializing the buffer memory during a period in which the communication is temporarily interrupted It has the structure.

[0030] With this configuration, even when communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to suppress disturbance and delay in video and audio.

[0031] The mobile communication system of the present invention detects a period during which communication is temporarily interrupted, and a communication control unit that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit. A transmission control device having a disconnection detecting unit, and the communication control unit discards data during a period in which the communication is temporarily interrupted. [0032] With this configuration, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

The invention's effect

[0033] The present invention includes a communication control unit that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit, and a disruption detection unit that detects a period during which communication is temporarily disrupted. The communication control unit discards data during a period when communication is temporarily interrupted, so that even if communication is temporarily interrupted due to a handover or weak electric field condition, the delay of video and audio is suppressed. Communication can be recovered.

Brief Description of Drawings

FIG. 1 is a block diagram showing a configuration of a transmission control apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the transmission control apparatus according to the embodiment of the present invention.

[FIG. 3] FIG. 3 (A) is a diagram schematically showing the operation of a conventional portable terminal when communication is temporarily interrupted. FIG. 3 (B) is a diagram schematically showing the operation of the transmission control apparatus according to the embodiment of the present invention when communication is temporarily interrupted.

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

Explanation of symbols

[0035] 10 Video input section

11 Video encoder

12 Video transmission buffer memory

13 Video buffer initialization section

14 Video encoding control unit

15 Communication interruption detection unit

16 Audio input section

17 Speech encoder

18 Voice transmission buffer memory

19 Audio buffer initialization section 20 Speech coding controller

21 Multiplexer

22 Communication control unit

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a transmission control device and a transmission control method according to an embodiment of the present invention will be described with reference to the drawings.

[0037] The transmission control device temporarily stores the video input unit 10 for capturing video data, the video code unit 11 for encoding the video data and generating the encoded video data, and the encoded video data. Video transmission buffer memory 12, video notifier initialization unit 13 that initializes video transmission buffer memory 12, and video code control unit 14 that controls video code control unit 11, and the period during which communication is interrupted are detected Interruption detection unit 15, audio input unit 16 for capturing audio data, audio encoding unit 17 for encoding audio data and generating encoded audio data, and audio for temporarily storing the encoded audio data Transmission buffer memory 18, audio buffer initialization unit 19 for initializing audio transmission buffer memory 18, audio encoding control unit 20 for controlling audio encoding unit 17, audio transmission buffer memory 18 and video transmission buffer Encoding audio data and encoded video data are acquired from the memory 12, and a multiplexing unit 21 for multiplexing the encoded audio data and encoded video data is selectively communicated with a plurality of base stations, And a communication control unit 22 for transmitting multiplexed data.

[0038] The video input unit 10 is installed in a communication terminal, for example, an input device such as a camera that captures video during a videophone call, and an analog Z digital variable ^^ that generates video data showing the video. , And input buffer memory for temporarily storing video data!

The video code key control unit 14 controls the video code key unit 11, controls the timing of the frame rate, initializes the video code key unit 11, and controls the frame type such as an intra picture. It is designed to do things.

[0040] The video encoding unit 11 is one of the standards established by the International Telecommunication Union (ITU-T), H.261 or H.263, ISO (International Organization for Standardization) and IEC (International Electrotechnical Standard). Video data can be encoded based on MPEG-4, which is a conference standard! [0041] The video transmission buffer memory 12 buffers the code video data for waiting for processing until the multiplexing process with the code audio data is executed.

[0042] The voice input unit 16 captures voice during videophone calls and voice communication and generates voice data. It may be configured with an input device such as a microphone installed in the communication terminal, analog Z digital transformation, input buffer memory, etc.

Similar to the video code key control unit 14, the audio coding control unit 20 executes timing control such as a frame rate and initialization of the voice code key unit 17.

[0044] The voice encoding unit 17 may encode the voice data by the AMR encoding method which is a standard audio encoding method of 3GPP (standardization organization of the third generation mobile phone system).

[0045] The audio transmission buffer memory 18 buffers the code audio data for waiting for processing until the multiplexing process with the code video data is executed.

The multiplexing unit 21 may have a multiplexing buffer for buffering multiplexed data for waiting for transmission until the multiplexed data is output to the wireless transmission path. In the case of a system that outputs only video data or audio data, the multiplexing unit 21 may be omitted.

[0047] The communication control unit 22 may include a communication control processor, a baseband processing unit, an RF control unit, and the like in order to output multiplexed data to the wireless transmission path.

[0048] The interruption detection unit 15 monitors the communication state of the communication control unit 22, and detects communication interruption due to a handover or a weak electric field.

[0049] The video buffer initialization unit 13 is controlled by the video code control unit 14 in response to the detection of the communication interruption by the interruption detection unit 15, and the video buffer initialization unit 13 controls the code video while the communication is interrupted. Data is prevented from being stored in the video transmission buffer memory 12, the encoded video data remaining as untransmitted data in the video transmission buffer memory 12 is discarded, and the video transmission buffer memory 12 is initialized. It comes to be.

[0050] The voice buffer initialization unit 19 is controlled by the voice code control unit 20 in response to the detection of the communication interruption by the interruption detection unit 15, and the code buffer voice while the communication is interrupted. Prevents data from being stored in the audio transmission buffer memory 18, discards the encoded audio data that remains as untransmitted data in the audio transmission buffer memory 18, and initializes the video transmission buffer memory 12. It comes to be. Next, the operation of the transmission control apparatus according to the present embodiment will be described with reference to FIG.

[0052] In the transmission control apparatus of the present embodiment, it is assumed that video data is processed at a preset frame period. Audio data is processed in the same way as video data, but a description thereof is omitted here.

[0053] The video code key control unit 14 determines whether or not the video data is at the frame code key processing timing (step S30). This determination may be performed in synchronization with the periodic timer or the video input unit 10. When it is determined that it is not the encoding timing, the encoding timing is waited again.

[0054] When it is determined that it is the sign key processing timing, whether or not communication is interrupted based on information from the communication control unit 22 is determined by the disconnection detection unit 15 ( Step S 31).

[0055] When it is determined that the communication has been interrupted! /, It is determined that the normal video data encoding process is executed by the video encoding unit 11 for each frame (step S32). The video data is temporarily stored in the video transmission buffer memory 12.

Next, the encoded video data and the encoded audio data are multiplexed by the multiplexing unit 21.

The multiplexed data is output from the communication control unit 22 to the transmission path.

[0057] On the other hand, when it is determined that communication is interrupted, the video data in the video transmission buffer memory 12 and the audio data in the audio transmission buffer memory 18 are discarded (step S33), and temporal continuity is maintained. An initialization frame that does not depend on is encoded by the video code key unit 11 and the audio code key unit 17 (step S34).

[0058] Regarding video, for example, intra pictures, intra frames, I-VOP (MPEG-

By executing the sign 4), communication can be recovered without disturbing the video and audio on the receiving side even if the data of the previous frame is lost on the transmission path.

[0059] With regard to audio, if the AMR encoding method is used, encoding a special frame that can initialize AMR, such as a homing frame, will disturb the video and audio on the receiving side even if data loss occurs. It is possible to recover communication without making it happen.

Next, with reference to FIGS. 3A and 3B, the operation of the transmission control device according to the present embodiment when communication is interrupted will be described in more detail. In the conventional mobile terminal, when communication is interrupted, even if the video data encoding process in the video encoding unit 11 is stopped, untransmitted data in the video transmission buffer memory is transmitted after the communication is recovered. As a result, a delay occurs (see Fig. 3 (A)). Also, since the temporal continuity of the video is not guaranteed, the video tends to be disturbed.

On the other hand, in the transmission control device of the present embodiment, the encoded video data encoded by the video encoding unit 11 and stored in the video transmission buffer memory 12 immediately before communication is interrupted, that is, Frame 6 (see Figure 3 (B)) is discarded.

[0063] In addition, during the period in which communication is interrupted, initialization frames 7 to 9 (see FIG. 3B) that do not depend on temporal continuity with frame 6 immediately before the communication is interrupted are video. The encoding unit 11 sequentially encodes and stores it in the video transmission buffer memory 12. However, when the initialization frame 7 and the initialization frame 8 are encoded and output to the video transmission buffer memory 12, the communication is restored, so the initialization frame 7 and the initialization frame 8 are also discarded. Is done.

On the other hand, when communication is restored when the initialization frame 9 is output from the video encoding unit 11 to the video transmission buffer memory 12, the initialization frame 9 is transferred from the video transmission buffer memory 12 to the multiplexing unit 21. Is output.

[0065] Therefore, even if communication is temporarily interrupted due to a handover or a weak electric field state, it is possible to restore communication while suppressing disturbance and delay of video and audio.

[0066] Further, the constituent elements of the transmission control apparatus of the present embodiment may be replaced with a CPU (computer).

Next, a transmission control method, a transmission control program, and a computer-readable storage medium realized by software will be described.

[0068] In the transmission control method of the present embodiment, a communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit, and a period during which communication is temporarily interrupted And detecting the interruption, and in the communication control step, the data in the period in which the communication is temporarily interrupted is discarded. Furthermore, the encoding step for encoding the audio data in transmission units and generating the encoded audio data, the storage step for temporarily storing the encoded audio data in the buffer memory in the transmission unit, and the buffer memory are initialized. An initial step that can be performed, and in the initial step, communication is During the time-out period, the encoded audio data generated in the encoding step is discarded and the buffer memory is initialized! /.

[0069] Further, the transmission control program of the present embodiment is a communication control step for selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit to a computer. In the communication control step, data in a period in which communication is temporarily interrupted is discarded in a communication control step. In addition, an encoding step for encoding audio data in units of transmission and generating encoded audio data, a storage step for temporarily storing encoded audio data in units of transmission in a buffer memory, and a buffer memory are provided. An initial step that can be initialized, and the computer discards the encoded voice data generated in the encoding step during the period when communication is temporarily interrupted in the initial step. However, notifier memory is initialized.

In addition, the computer-readable storage medium according to the present embodiment encodes audio data in transmission units, generates an encoded audio data, and encodes audio data in transmission units. A storage step for temporarily storing the buffer memory; and an initial input step for initializing the buffer memory, wherein the computer is in a period during which communication is temporarily interrupted during the initialization step. The encoded speech data generated in the encoding step is discarded and the nota memory is initialized. Further, the encoding step for encoding the audio data and the video data in the transmission unit to generate the encoded audio data and the encoded video data, and the encoded audio data and the encoded video data in the transmission unit temporarily. A storage step for storing the data in the buffer memory and an initial step that can initialize the buffer memory, and the encoding step is performed in the computer during a period in which communication is temporarily interrupted in the initial step. The coded audio data and the coded video data generated in step 1 are discarded, and the noffer memory is initialized.

[0071] Also, in the mobile communication system of the present embodiment, communication is temporarily interrupted with a communication control unit that selectively communicates with a plurality of base stations and transmits data in preset transmission units. A transmission control device having a interruption detection unit for detecting a period is provided, and the communication control unit discards data in a period in which communication is temporarily interrupted. [0072] As described above, the transmission control apparatus of the present embodiment communicates temporarily with a communication control unit that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit. The communication control unit discards data during a period in which communication is temporarily interrupted, so that communication is temporarily interrupted due to a handover or weak electric field condition. Even if there is a disruption, communication can be recovered while suppressing disturbances and delays in video and audio.

[0073] Also, the transmission control apparatus of the present embodiment encodes audio data and video data in units of transmission, generates an encoded audio data and encoded video data, and encoded audio data and code. A buffer memory that temporarily stores the video data in units of transmission and an initialization unit that can initialize the buffer memory, and the initialization unit is generated during a period when communication is temporarily interrupted. The codeh audio data and codeh video data are discarded in the code field and the noffer memory is initialized, so even if communication is temporarily interrupted due to handover or weak electric field conditions. In addition, video and audio disturbances and delays can be suppressed.

[0074] Also, in the transmission control method of the present embodiment, the communication is temporarily interrupted with the communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit. In the communication control step, data in a period when communication is temporarily interrupted is discarded, so that communication is temporarily suspended due to handover or weak electric field conditions. Even if the communication is interrupted, communication can be recovered by suppressing the disturbance and delay of video and audio.

[0075] Further, the transmission control program of the present embodiment selectively communicates with a plurality of base stations to a computer and transmits data in a preset transmission unit, and the communication is temporarily performed. In the communication control step, communication is temporarily interrupted due to a handover or weak electric field condition. However, if the video and audio are disturbed, the delay can be suppressed and communication can be recovered.

[0076] Further, the computer-readable storage medium according to the present embodiment is a communication that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit. The control step and the interruption detection step for detecting a period in which communication is temporarily interrupted are executed, and a transmission control program for discarding data in the period in which communication is temporarily interrupted is recorded in the communication control step. Therefore, even if communication is temporarily interrupted due to a handover or a weak electric field condition, the communication can be recovered by suppressing the disturbance and delay of video and audio.

Industrial applicability

As described above, the transmission control device according to the present invention can recover communication by suppressing disturbance and delay of video and audio even if communication is temporarily interrupted due to handover or weak electric field condition. It is useful as a portable terminal having a relatively low cost.

Claims

The scope of the claims

[1] A communication control unit that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit;

A disruption detection unit for detecting a period during which the communication is temporarily disrupted,

The transmission control device, wherein the communication control unit discards data in a period in which the communication is temporarily interrupted.

[2] An encoding unit that encodes audio data in the transmission unit and generates encoded audio data;

A buffer memory for temporarily storing the encoded audio data in the transmission unit; and an initialization unit capable of initializing the buffer memory,

2. The initialization unit causes the encoding unit to discard the encoded audio data generated during a period in which the communication is temporarily interrupted, and initializes the buffer memory. The transmission control device according to 1.

[3] An encoding unit that encodes audio data and video data in the transmission unit to generate encoded audio data and encoded video data, and the encoded audio data and the encoded video data in the transmission unit. A buffer memory for temporarily storing, and an initialization unit capable of initializing the buffer memory,

The initialization unit causes the encoding unit to discard the encoded audio data and the encoded video data generated during a period in which the communication is temporarily interrupted, and initializes the buffer memory. The transmission control device according to claim 1, wherein:

[4] A communication control step for selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit;

A disconnection detecting step for detecting a period in which the communication is temporarily interrupted, and in the communication control step, data in a period in which the communication is temporarily interrupted is discarded. Method.

[5] An encoding step for encoding audio data in the transmission unit and generating encoded audio data; and a storage step for temporarily storing the encoded audio data in the buffer memory in the transmission unit; And an initial step capable of initializing the buffer memory, 5. The initial key step includes discarding the encoded voice data generated in the code key step and initializing the buffer memory during a period in which the communication is temporarily interrupted. The transmission control method described in 1.

[6] An encoding step of encoding audio data and video data in the transmission unit to generate encoded audio data and encoded video data; and the encoded audio data and the encoded video data in the transmission unit A storage step for temporarily storing the buffer memory; and an initial step capable of initializing the buffer memory. In the initial step, the communication is temporarily interrupted. 5. The transmission control method according to claim 4, wherein the encoded audio data and the encoded video data generated in the encoding step are discarded, and the buffer memory is initialized.

[7] A communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit to a computer, and a detection step of detecting a period during which the communication is temporarily interrupted And a transmission control program for discarding data in a period in which the communication is temporarily interrupted in the communication control step.

[8] An encoding step for encoding audio data in the transmission unit and generating encoded audio data, and a storage step for temporarily storing the encoded audio data in the buffer memory in the transmission unit; And an initial step capable of initializing the buffer memory,

The computer is configured to discard the encoded voice data generated in the encoding step and initialize the buffer memory in a period in which the communication is temporarily interrupted in the initial step. The transmission control program according to 7.

[9] An encoding step of encoding audio data and video data in the transmission unit to generate encoded audio data and encoded video data; and the encoded audio data and the encoded video data in the transmission unit A storage step for temporarily storing the buffer memory; and an initial step for initializing the buffer memory, wherein the communication is temporarily interrupted in the initial step. 8. The encoded audio data and the encoded video data generated in the encoding step are discarded, and the buffer memory is initialized. The transmission control program.

[10] A communication control step of selectively communicating with a plurality of base stations and transmitting data in a preset transmission unit to a computer, and a detection step of detecting a period during which the communication is temporarily interrupted A computer-readable storage medium recording a transmission control program for discarding data during a period in which the communication is temporarily interrupted in the communication control step.

[11] An encoding step for encoding audio data in the transmission unit and generating encoded audio data; and a storage step for temporarily storing the encoded audio data in the buffer memory in the transmission unit; And an initial step capable of initializing the buffer memory,

In the initial step, the computer records a transmission control program for discarding the encoded voice data generated in the encoding step and initializing the buffer memory during a period in which the communication is temporarily interrupted. The computer-readable storage medium according to claim 10, wherein the storage medium is a computer-readable storage medium.

[12] An encoding step of encoding audio data and video data in the transmission unit to generate encoded audio data and encoded video data; and the encoded audio data and the encoded video data in the transmission unit A storage step for temporarily storing the buffer memory; and an initial step for initializing the buffer memory, wherein the communication is temporarily interrupted in the initial step. 11. The transmission control program for discarding the encoded audio data and the encoded video data generated in the encoding step and initializing the buffer memory is recorded in claim 10. The computer-readable storage medium described.

[13] A communication control unit that selectively communicates with a plurality of base stations and transmits data in a preset transmission unit, and a disruption detection unit that detects a period during which the communication is temporarily disrupted. Equipped with a control device,

The mobile communication system, wherein the communication control unit discards data during a period in which the communication is temporarily interrupted.