KR101364707B1 - Method and apparatus for media access control layer scheme of real-time multimedia service - Google Patents

Abstract

The present invention is to ensure the quality of real-time multimedia data transmission, and more particularly, to a method and apparatus for ensuring the quality of real-time multimedia data transmission using a virtual slot in the MAC layer of the communication network.
According to the present invention, when periodic priority content data is required to be transmitted, virtual slots are allocated at periodic intervals corresponding to the quality of service (QoS) of priority content data, and other terminals other than the terminal to transmit priority content data are to be transmitted. By adjusting the transmission time of the data, it is possible to prevent the deterioration of the content data and to guarantee the quality of service (QoS). Meanwhile, according to the present invention, other terminals selectively transmit data in consideration of the allowable range of transmission delay jitter, and the terminal to transmit content data may also flexibly operate a virtual slot, thereby ensuring QoS. On the other hand, the degradation of the throughput of the entire network can be prevented.

Description

METHOD AND APPARATUS FOR MEDIA ACCESS CONTROL LAYER SCHEME OF REAL-TIME MULTIMEDIA SERVICE}

The present invention is to ensure the quality of the real-time multimedia data transmission, and more particularly, a method for ensuring the quality of the real-time multimedia data transmission using a virtual slot in the media access control (MAC) layer of the communication network and Relates to a device.

The present invention is derived from the research conducted as part of the university IT research center upbringing support project of the Information and Communications Industry Promotion Agency [Task Management Number: NIPA-2012- (H0301-12-2003)], Title: Defense IT Tactical Communication Technical research].

In general, data transmission is performed using a protocol based on Transmission Control Protocol / Internet Protocol (TCP / IP), a communication protocol developed by the US Department of Defense. TCP / IP combines data by combining IP, which is a network layer protocol corresponding to three layers of Open System Interconnection (OSI), and TCP or User Datagram Protocol (UDP), which is a transport layer protocol corresponding to four layers of OSI. You give and take

The real-time multimedia transmission such as voice information in the wireless ad hoc network using the same affects the quality by obtaining the transmission opportunity in the MAC layer. For example, in the MAC protocol of the MIL-STD-188-220, a transmission opportunity is given to each terminal in a round robin scheme. In addition, there can be a transmission opportunity difference according to priority, and priority of Urgent, Priority, Routine, etc. are sequentially rotated. A higher priority message can be transmitted not only in the corresponding priority slot but also in its own lower priority slot.

That is, when an urgent message occurs, a message can be transmitted when an urgent, priority, and routine slot corresponding to its order comes. In addition, since the other terminal may transmit the Urgent message through the bump slot even after completing the data transmission, the Urgent message can reduce the delay time and obtain a fast transmission opportunity compared to other messages. Voice message can be set to Urgent according to the existing protocol.

In addition, in the real-time multimedia transmission using MIL-STD-188-220, the transmission opportunity is sequentially assigned to all participating terminals. Therefore, each terminal can be transmitted only in a slot given its own transmission opportunity, and in the case of an Urgent message, it can be transmitted through a bump slot immediately after transmission of another terminal message. The terminal starts a voice call and transmits a voice message to its own slot and transmits the voice message at regular intervals to ensure the quality of service (QoS) of continuously generated voice data.

On the other hand, as an example of a technique for controlling the access to the slot is granted in order to improve the QoS of the voice message, etc. Korean Patent No. KR 10-1040218 "How to improve the quality of periodic voice data service in the wireless personal area network" guarantees transmission of the voice message A method for improving the quality of service of voice messages by transmitting using the slot channel approach has been proposed.

However, in the above patent, even if the voice message is transmitted using the transmission guarantee slot channel, since transmission is possible only after the transmission of the slot or another terminal which is authorized for transmission thereof, transmission delay occurs and causes voice disconnection and QoS ( There is still a problem that does not guarantee Quality of Service. In addition, there is a problem in that the transmission throughput of the entire network is reduced due to the reduced transmission opportunity of other terminals due to the transmission guarantee slot channel allocated to the voice message.

Korea Patent Registration KR 10-1040218

The present invention has been made to solve the above-mentioned problems of the prior art, and guarantees the use of a channel based on a virtual slot in a voice message or a multimedia message when transmission of a voice message or a multimedia message is required. It aims to guarantee the Quality of Service.

In addition, the present invention is to maximize the data transmission opportunities to the other terminals other than the terminal assigned a virtual slot in order to prevent the phenomenon that the data transmission opportunities of the other terminal is deprived due to the channel monopoly of the specific terminal, thereby reducing the throughput of the network. The aim is to provide a guaranteeable technology.

In order to achieve the above object, the real-time priority content data transmission apparatus according to an embodiment of the present invention includes a virtual slot information determiner, a message transmitter, and a data transmitter.

The virtual slot information determination unit first determines the length and period of the virtual slot to be allocated for the priority content data so as to guarantee the quality of service (QoS) of the content message to a reference level or higher. The message transmitter broadcasts an assignment request message for the virtual slot on the network. At this time, the allocation request message includes a length and a period determined for the virtual slot. The data transmission unit first transmits the content data using the virtual slots according to the determined length and period.

In this case, the data transmission unit may include a monitoring unit and a time adjusting unit. The monitoring unit may check whether data is being transmitted from another terminal on the network. The time adjuster may adjust a start time of the virtual slot. The time adjustment unit may adjust the start time of the virtual slot within the allowable range of the data transmission delay jitter according to the result of the monitoring unit. In this case, the data transmission delay variation may be determined by the virtual slot information determiner. The virtual slot information determination unit may determine the allowable range of the data transmission delay variation for the priority content data in consideration of the codec information for the priority content data and the reference level for the quality of service (QoS) of the priority content data.

According to an exemplary embodiment, the monitoring unit may check whether data is being transmitted from another terminal on the network after a predetermined period of time has elapsed from a previously allocated virtual slot. At this time, if data is transmitted from another terminal on the network as a result of the monitoring unit, the time adjusting unit may adjust the start time of the virtual slot within the allowable range of the data transmission delay variation.

According to another exemplary embodiment, when the monitoring unit determines that no data is being transmitted from another terminal after a time elapsed from the previously allocated virtual slot (the determined period-the allowable range of the delay variation), the time adjusting unit virtually The start time of the slot may be adjusted in a direction that advances by an allowable range of delay variation than the original period.

Meanwhile, according to an embodiment of the present invention, when all data corresponding to the priority content data using the virtual slot is completed, the message transmitter may broadcast a release message for the virtual slot.

According to another embodiment of the present invention, if a separate release message is not broadcasted, but no data is transmitted during the time interval allocated to the virtual slot according to the determined period and length, each terminal monitors this to the virtual slot. It is also possible to confirm the release for the embodiment.

An apparatus for guaranteeing quality of real-time priority content data according to another embodiment of the present invention includes a message receiver and a data transmitter. In addition, the virtual slot information extraction unit may be further included.

The message receiving unit includes a length and period information determined for the virtual slot to be allocated for the priority content data so as to ensure the quality of service (QoS) of the priority content data above the reference level. Is received from the network. The data transmission unit transmits data on the network in a time interval other than the time interval allocated for the virtual slot, which is derived based on the length and period information for the virtual slot. The virtual slot information extractor may extract information about the virtual slot, such as the length and period of the virtual slot, from the received request message and transmit the extracted information to the data transmitter.

Meanwhile, the message receiver or the virtual slot information extractor may extract the allowable range information of the transmission delay variation for the content data from the allocation request message. At this time, the data transmission unit may transmit the data on the network if the time at which data transmission is terminated is within the allowable range of the data transmission delay variation from the start time allocated for the virtual slot.

The apparatus for guaranteeing quality of real-time priority content data according to the present invention may transmit an acknowledgment message on the network when the allocation request message is received. This may be particularly useful in that the reliability of the priority content data transmission and quality guarantee method of the present invention can be improved in an environment where the number of terminals connected to the network is limited.

Meanwhile, the real-time priority content data transmission device and the quality guarantee device described above represent different aspects of terminals connected to the network, and may be interpreted as meaning terminals all connected to the network.

The present invention is designed based on the round-robin MIL-STD-188-200 protocol, but is applied to most MAC protocols operating on a competitive basis as well as the MIL-STD-188-200 protocol. This is possible. Priority content data transmission control method using a virtual slot (or temporary slot) in the MAC layer proposed in the present invention has the advantage of guaranteeing QoS, but also does not reduce the throughput of the network.

In addition, the present invention as a technique that can be applied to the defense communication industry at home and abroad, as well as the defense sector by ensuring the QoS of real-time mutual multimedia communication, such as VoIP of the tactical data network system in the defense field, It can also contribute to the improvement of service quality in the field of IP-based multimedia communication.

The priority content data of the present invention includes not only multimedia data such as voice data and video data, but also emergency message data for an emergency situation can be included in the priority content data. In particular, the priority content data refers to data requiring real-time performance and quality of service (QoS), and may be applied to various priority content data by the user's selection.

The present invention can be applied to a portable information terminal as a whole, and can be widely applied to services requiring processing of urgent information such as u-Healthcare and contents requiring selective priority. It can also be applied to general multimedia services.

1 is a diagram illustrating a concept of a method for transmitting real-time multimedia data according to an embodiment of the present invention.
2 is a flowchart illustrating a method of transmitting real-time multimedia data according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a method of transmitting priority content data through a virtual slot having a start time adjusted within a data transmission delay variation, that is, jitter, according to an embodiment of the present invention.
4 is an operation flowchart illustrating a process of determining an allowable range of jitter according to an embodiment of the present invention.
5 is a flowchart illustrating a process of transmitting a release message for a virtual slot according to an embodiment of the present invention.
6 is a flowchart illustrating a method of guaranteeing a quality of service (QoS) of priority content data according to an embodiment of the present invention.
7 and 8 are an operation flowchart illustrating a method of guaranteeing a quality of service (QoS) of priority content data that can improve transmission throughput in consideration of the allowable range of jitter according to an embodiment of the present invention.
9 is a block diagram conceptually illustrating an apparatus for transmitting priority content data according to an embodiment of the present invention.
FIG. 10 is a block diagram illustrating an embodiment of the data transmission unit of FIG. 9 in more detail.
11 is a block diagram conceptually illustrating an apparatus for guaranteeing transmission quality of priority content data according to an embodiment of the present invention.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 is a diagram illustrating a concept of a method for transmitting real-time multimedia data according to an embodiment of the present invention.

As shown in FIG. 1, a voice call is initiated at a first terminal on a communication network 100 (Event 1). At this time, the first terminal broadcasts the virtual slot allocation request message on the network 100 by using the slot # 1 granted to the first terminal (Event 2).

The communication network 100 illustrated in FIG. 1 is based on the premise that each participating terminal alternately allocates a slot in a round robin manner and transmits data or a message to the network 100. However, the spirit of the present invention is not limited to this, and can be applied to a network operated in a competitive manner.

Meanwhile, the first terminal determines a period and a length of the virtual slot for voice call data before broadcasting the virtual slot allocation request message. The period and length of the virtual slot may be determined according to the reference level of the quality of service (QoS) of the voice call. Meanwhile, although the target data of the virtual slot is described as voice call data in the embodiment of FIG. 1, the idea of the present invention is not limited to voice call data, but other data such as multimedia data, video data, and emergency data requiring urgentness. Compared to the priority content data that needs priority processing, it can be generally applied.

On the other hand, the length of the default slot sequentially assigned to each terminal on the network 100 may be specified separately. The length of the virtual slot 110 may be determined according to the QoS of the content data regardless of the length of the default slot that is previously designated.

The terminal 1 transmits a voice message (voice call data) using the virtual slot 110 (Event 3).

Since the virtual slot 110 has a length determined in advance, and the length of the virtual slot 110 has been broadcasted to each of the terminals in the network 100 through an allocation request message, the network 100 may include the virtual slot 110. From this point of time, the base slots are sequentially allocated to the respective terminals.

Referring to FIG. 1, it is time for terminal 5 to allocate basic slot # 5 and transmit data. When data transmitted by terminal 5 overlaps with a spare time interval of a secondary virtual slot considering a virtual slot period 120 and a length, Terminal 5 may be suspended without transmitting data (Event 4).

At this time, although the terminal 5 has a message / data to be transmitted in its transmission slot (slot # 5), the terminal 5 transmits the corresponding message / data within the reference 120 transmission delay variation (jitter) tolerance range 130 of the virtual slot. If it is determined that the transmission is not completed, the transmission slot # 5 may be suspended without transmitting data.

The terminal 1 transmits a periodic voice message (voice call data) on the network 100 by using a secondary virtual slot according to a pre-broadcasted period and length (Event 5).

At this time, even if there is data to be transmitted by the virtual slot allocation request of the terminal 1, if the terminal is included in the spare time interval of the virtual slot, it cannot be transmitted. Therefore, in order to guarantee the QoS of UE 1, data transmission throughput of other UEs may decrease. In order to prevent such a throughput reduction, in the present invention, the terminal 1 and the terminal 5 not only consider the period 120 and the length of the virtual slot, but additionally consider the jitter tolerance 130 and selectively transmit data. Adopted the process of determining

The allowable range of jitter 130 may be broadcast together through an Evnet 2 via an allocation request message of a virtual slot. The allowable range of jitter 130 is a value that can be determined in consideration of the codec of the content data and the reference level of QoS, and can also be related to the size of the data buffer held in each terminal. Value.

That is, since the terminal 1 or the counterpart terminal of the terminal 1 has a data buffer of a certain size, even if the transmission of data is delayed or advanced by a predetermined range beyond the period 120 of the originally determined virtual slot, the QoS is reduced by supplementing this. Can be prevented.

Therefore, the terminal 5 does not strictly determine whether the slot # 5 and the secondary virtual slot overlap at the time e, which is the period 120 of the virtual slot, from the time when the virtual slot 110 starts, (ta) ~ It may be determined whether data transmission through slot # 5 can be completed within the (t + a) time interval. At this time, the origin of the time axis is the time when the primary virtual slot 110 starts, and in the following description, "time" or "time" means the time elapsed from the time when the primary virtual slot 110 starts. do.

That is, even if slot # 5 overlaps at time t, if the data transmission through slot # 5 can be completed before time t + a, the fifth terminal can transmit data through slot # 5, and the first terminal After monitoring the situation of the network 100 to confirm that data transmission through the slot # 5 of the fifth terminal is completed, the start time of the secondary virtual slot may be moved to t + a to adjust it.

2 is a flowchart illustrating a method of transmitting real-time priority content data according to an embodiment of the present invention.

9 is a block diagram conceptually illustrating an apparatus for transmitting priority content data according to an embodiment of the present invention.

2 and 9, the apparatus 900 for transmitting content data corresponds to the first terminal of FIG. 1, and includes a virtual slot information determiner 910, a message transmitter 920, and a data transmitter. 930.

The virtual slot information determination unit 910 first determines the length and period of the virtual slot that can guarantee the QoS of the content data to a reference level or more (S210).

The message transmitter 920 broadcasts an allocation request message for the virtual slot on the network 100 including the determined period and length (S220).

The data transmitter 930 first allocates and transmits content data to a virtual slot according to the determined period and length (S230).

FIG. 3 is a flowchart illustrating a method of transmitting priority content data through a virtual slot having a start time adjusted within a data transmission delay variation, that is, jitter, according to an embodiment of the present invention.

FIG. 10 is a block diagram illustrating in more detail an embodiment of the data transmitter 930 of FIG. 9.

3 and 10, the data transmitter 930 may include a monitor 1010 and a time adjuster 1020.

The monitoring unit 1010 checks the transmission data on the network 100 at time t (S310), and checks whether other terminals are transmitting data (S320).

If the other terminal is not transmitting data at time t, the data transmitter 930 first transmits the content data onto the network 100 using the virtual slot according to a predetermined length and period (S230).

If the other terminal is transmitting data at time t, the time adjusting unit 1020 may adjust the start time of the virtual slot within the allowable range of the jitter (S330). Subsequently, the data transmitter 930 first transmits content data using a virtual slot in accordance with the adjusted start time (S230).

The other terminal first completes the data transmission in consideration of allowing the content data transmission apparatus 900 to transmit the priority content data within the allowable range 130 of jitter from the period 120 of the virtual slot. The start time will not exceed the time (t + a) at the latest. The data transmitter 930 may start to transmit the content data at least before the time t + a.

3 illustrates an embodiment in which the time adjuster 1020 may adjust the start time of the virtual slot within a time interval between t and (t + a), but in another embodiment of the present invention, the start time of the virtual slot ( In some cases, adjustment may be made within a time interval between ta) and (t + a). The monitoring unit 1010 may check whether another terminal is transmitting data on the network 100 after a time t-a has elapsed from the time when the primary virtual slot 110 starts. At this time, as a result of checking by the monitoring unit 1010, if another terminal is not transmitting data on the network 100 at time (ta), the time adjusting unit 1020 to advance the start time of the virtual slot to (ta) I can adjust it. At this time, the data transmitter 930 may transmit the content data through the virtual slot from the time t-a.

At this time, if the network 100 is operated in a round robin manner and each terminal is sequentially assigned slots, the monitoring unit 1010 checks whether the terminal allocated the slot of the corresponding time is transmitting data. do.

Alternatively, when the network 100 is operated in a general competition method, the monitoring unit 1010 may receive a communication channel at a corresponding time and check which arbitrary terminal is transmitting data.

4 is an operation flowchart illustrating a process of determining an allowable range of jitter according to an embodiment of the present invention.

Referring to FIG. 4, the virtual slot information determiner 910 allows data transmission delay variation of preferred content data in consideration of reference levels of codec information of preferred content data and quality of service (QoS) of the preferred content data. The range may be determined (S410).

5 is a flowchart illustrating a process of transmitting a release message for a virtual slot according to an embodiment of the present invention.

The message transmitter 920 checks whether transmission of all data corresponding to the priority content data using the virtual slot is completed (S510). If the transmission of all data corresponding to the content data is completed first, the message transmitter 920 broadcasts a release message for the virtual slot (S520).

Although FIG. 5 illustrates an embodiment of transmitting a release message for a virtual slot, according to another embodiment of the present invention, priority content is added to a time interval reserved for a virtual slot without transmitting a separate release message for the virtual slot. If the message is not transmitted, an embodiment in which terminals connected to the network 100 first grasp that the transmission of the content message is completed may be possible.

6 is a flowchart illustrating a method of guaranteeing a quality of service (QoS) of priority content data according to an embodiment of the present invention.

11 is a block diagram conceptually illustrating an apparatus for guaranteeing transmission quality of priority content data according to an embodiment of the present invention.

6 and 11, the apparatus 1100 for guaranteeing transmission quality of content data includes a message receiver 1110 and a data transmitter 1130. Also, the apparatus 1100 for guaranteeing transmission quality of content data may further include a virtual slot information extractor 1120.

First, the apparatus 1100 for guaranteeing transmission quality of content data may mean any one of all other terminals connected to the network 100 except for the first terminal of FIG. 1.

The message receiving unit 1110 includes the length and period information 120 determined for the virtual slot to be allocated for the priority content data so as to ensure the quality of service (QoS) of the priority content data above a reference level. An allocation request message for the slot is received from the network 100 (S610).

The virtual slot information extractor 1120 may derive the period 120 and the length of the virtual slot from the allocation request message (S620).

The data transmitter 1130 may transmit data on the network in a time interval other than the reserved time interval allocated for the virtual slot derived based on the length and the period information 120 for the virtual slot (S630 to S650). ).

The data transmitter 1130 may determine whether the allocated default time interval for the base slot allocated to the virtual slot and the virtual slot overlap with each other (S630).

At this time, if the reserved time intervals allocated for the basic slot and the virtual slot do not overlap, the data transmitter 1130 may transmit data using the allocated default slot (S650).

At this time, if the reserved time intervals for the basic slot and the virtual slot overlap, the data transmitter 1130 may hold or wait (S640) without transmitting data.

7 and 8 are an operation flowchart illustrating a method of guaranteeing a quality of service (QoS) of priority content data that can improve transmission throughput in consideration of the allowable range of jitter according to an embodiment of the present invention.

Referring to FIGS. 7 and 8, the virtual slot information extractor 1120 may extract allowable range information of a data transmission delay variation for the content data from the allocation request message for the virtual slot (S810).

The data transmitter 1130 may determine whether a time at which data transmission is terminated is within an allowable range of the data transmission delay jitter from a start time allocated for the virtual slot (S630). In other words, the data transmitter 1130 may determine whether the allocated preliminary time intervals for the allocated basic slots and the virtual slots overlap (S630).

At this time, if the time at which data transmission is terminated is within the allowable range of the data transmission delay variation from the start time allocated for the virtual slot, the data transmitter 1130 may transmit data on the network 100 (S710 ˜ S). S720, S640).

The data transmitter 1130 may simulate the virtual slot by moving the virtual slot back and forth on the time axis by the allowable range of the delay variation (S710). Subsequently, the data transmitter 1130 may check whether the allocated basic slot and the simulated virtual slot still overlap (S720).

In particular, when the completion point of data to be transmitted by the data transmission unit 1130 does not fall within the allowable range a of the delay variation from the period information t of the broadcasted virtual slot, that is, it does not fall within the time t + a. If it is determined, the data transmitter 1130 may suspend the data slot without transmitting the data (S650).

As described above, the terminal device 900 to transmit content data and the terminal device 1100 connected to the network 100 cooperate with each other to selectively and flexibly transmit data, thereby providing priority to the quality of service of the content data. It is also a feature of the present invention that the data transmission throughput of other terminal devices 1100 on the network 100 can be maintained while achieving the desired reference level.

The terminal device 1100 according to an embodiment of the present invention may transmit an acknowledgment (Ack) message for the allocation request message for the virtual slot on the network 100.

Whether the terminal device 1100 transmits an Ack message for the allocation request message for the virtual slot may be determined in consideration of the characteristics of the network 100. For example, if a plurality of terminal devices 1100 are connected to the network 100, if all of them transmit an Ack message, resources of the network 100 will be unnecessarily occupied due to these Ack messages.

On the other hand, when a relatively small number of terminal devices 1100 are connected to the network 100, even if all of them transmit an Ack message, the probability that the network 100 may be congested is low, and the terminal device that wants to transmit content data first of all. The 900 may determine whether the other terminal devices 1100 have received the allocation request message for the virtual slot, thereby increasing the reliability of the protocol proposed by the present invention.

Real-time priority content data transmission method and priority content data quality guarantee method according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means may be recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: communication network
110: virtual slot
120: cycle of virtual slots
130: jitter allowable range

Claims (14)

Determining a length and a period of a virtual slot to be allocated for the priority content data to ensure a quality of service (QoS) of priority content data above a reference level;
Broadcasting on the network an assignment request message for the virtual slot, the determined length and period; And
Transmitting the priority content data using the virtual slot according to the determined length and period;
Real-time priority content data transmission method comprising a. The method of claim 1,
The step of transmitting the priority content data using the virtual slot
Checking whether data is being transmitted from another terminal on the network; And
Adjusting a start time of the virtual slot within an allowable range of a data transmission delay variation based on the verification result;
Real-time priority content data transmission method comprising a. The method of claim 1,
The step of transmitting the priority content data using the virtual slot
Checking whether data is being transmitted from another terminal on the network after a predetermined period of time has elapsed from a previously allocated virtual slot; And
If data is transmitted from another terminal on the network as a result of the checking, adjusting a start time of the virtual slot within an allowable range of a data transmission delay variation;
Real-time priority content data transmission method comprising a. The method of claim 1,
Determining an allowable range of a data transmission delay variation for the priority content data in consideration of the codec information for the priority content data and the reference level for the quality of service (QoS) of the priority content data;
Real-time priority content data transmission method further comprising. The method of claim 1,
Broadcasting a release message for the virtual slot when transmission of all data corresponding to the priority content data using the virtual slot is completed;
Real-time priority content data transmission method further comprising. In the terminal that does not transmit the priority content data, including the length and period information determined for the virtual slot to be allocated for the priority content data so as to ensure the quality of service (QoS) of the priority content data above a reference level, Receiving from the network an allocation request message for the virtual slot; And
In the terminal which does not transmit the priority content data, the priority content data is transmitted on the network in a time interval other than the time interval allocated for the virtual slot, which is derived based on the length and period information for the virtual slot. Transmitting data to be sent in a transmission slot of a terminal not owned;
Quality assurance method of the real-time priority content data comprising a. The method according to claim 6,
Extracting, from a terminal not transmitting the priority content data, allowable range information of a data transmission delay variation of the priority content data from an allocation request message for the virtual slot;
Further comprising:
The step of transmitting data to be transmitted in the transmission slot of the terminal that does not transmit the priority content data on the network,
Determining whether a time at which transmission of data to be sent in the terminal's own transmission slot ends is within an allowable range of the data transmission delay variation from a start time allocated for the virtual slot; And
If the time when the transmission of data to be sent in the terminal's own transmission slot is within the allowable range of the data transmission delay variation from the start time allocated for the virtual slot, the data to be transmitted in the terminal's own transmission slot on the network Transmitting;
Quality assurance method of the real-time priority content data comprising a. The method according to claim 6,
Transmitting, by the terminal not transmitting the priority content data, an acknowledgment message for the allocation request message for the virtual slot on the network;
How to ensure the quality of the real-time priority content data further comprising. A computer-readable recording medium in which a program for executing the method of any one of claims 1 to 8 is recorded. A virtual slot information determination unit which determines a length and a period of a virtual slot to be allocated for the priority content data so as to ensure a quality of service (QoS) of priority content data above a reference level;
A message transmitter configured to broadcast on the network an allocation request message for the virtual slot including the determined length and period; And
A data transmitter configured to transmit the priority content data using the virtual slot according to the determined length and period;
Real-time priority content data transmission apparatus comprising a. The method of claim 10,
The data transfer unit
A monitoring unit checking whether data is being transmitted from another terminal on the network; And
A time adjusting unit that adjusts a start time of the virtual slot within an allowable range of a data transmission delay variation based on a result of confirmation of the monitoring unit;
Real-time priority content data transmission apparatus comprising a. The method of claim 10,
The virtual slot information determiner
Real-time priority content data transmission device for determining the allowable range of the data transmission delay variation for the priority content data in consideration of the codec information for the priority content data and the reference level for the quality of service (QoS) of the priority content data . In the apparatus for ensuring the quality of real-time priority content data, included in a terminal that does not transmit the priority content data,
An allocation request message for the virtual slot is received from the network, including a length and period information determined for the virtual slot to be allocated for the priority content data so as to ensure the quality of service (QoS) of the priority content data above the reference level. Receiving message receiving unit; And
Transmission of data to be transmitted in a transmission slot of a terminal that does not transmit content data on the network in a time interval other than the time interval allocated for the virtual slot, which is derived based on the length and period information for the virtual slot. A data transmission unit;
Quality guarantee device of the real-time priority content data comprising a. 14. The method of claim 13,
The message receiving unit
Extracting allowable range information of a data transmission delay variation for the priority content data from the allocation request message for the virtual slot,
Wherein the data transfer unit comprises:
If the time when the transmission of data to be sent in the terminal's own transmission slot is within the allowable range of the data transmission delay variation from the start time allocated for the virtual slot, the data to be transmitted in the terminal's own transmission slot on the network A device for guaranteeing the quality of real-time priority content data to be transmitted.

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