KR100850735B1 - Apparatus and method for reporting loss packet and retransmitting request in a wireless communication system for data transmission - Google Patents

Abstract

The present invention relates to an apparatus and method for notifying whether a packet is received in a wireless communication system capable of transmitting data, and more particularly, to an apparatus and method for notifying a lost packet in a wireless communication system capable of transmitting data. The present invention relates to a method for reporting a lost packet in a data wireless communication system, comprising: collecting information of a lost packet, and when a report time of a predetermined lost packet arrives, a first packet of the lost packet arrives. Generating a loss report message with a last sequence number of a lost packet consecutively with the sequence number, and transmitting the generated loss report message.

Packet data, loss reporting, RTCP, RTP.

Description

TECHNICAL FIELD AND METHOD AND APPARATUS FOR REPORTING LOSS PACKET REPORT AND REPORT REPORT IN DATA WIRELESS COMMUNICATION SYSTEM

1 is a diagram illustrating a message standard currently being used for notifying whether a packet transmitted from a receiver is lost;

FIG. 2 is a diagram illustrating distinguishing lost packets and packets normally received when a packet is transmitted in a wireless communication system.

3 is a schematic block diagram of a portable terminal according to an embodiment of the present invention;

4 is a diagram illustrating a format of a message for indicating a lost packet according to a first embodiment of the present invention;

5 is a diagram illustrating a format of a message for indicating a lost packet according to a second embodiment of the present invention;

6 is a control flowchart when reporting a lost packet in a mobile terminal according to an embodiment of the present invention;

7 illustrates a format of a message for retransmission of a lost packet according to an embodiment of the present invention;

8 is a detailed structural diagram of a retransmission request message of a lost or delayed packet according to an embodiment of the present invention;

9 is a control flowchart of recording a lost packet in a wireless terminal of a data wireless communication system according to an embodiment of the present invention.

The present invention relates to an apparatus and method for notifying whether a packet is received in a wireless communication system capable of transmitting data, and more particularly, to an apparatus and method for notifying a lost packet and a method for requesting retransmission in a wireless communication system capable of transmitting data. It is about.

In general, a wireless communication system starts from a mobile communication system that provides a voice service, and is currently evolving into a form capable of providing various types of data services as technology is rapidly developed. Such services that can be provided in a wireless communication system can be roughly divided into real-time services, similar real-time services, and non-real-time services.

An example of a real-time service is a voice service. Similar real-time services include push to talk (PTT), voice of IP (VoIP) services, video on demand (VOD) and video telephone (VT). Finally, non-real-time services include a variety of services, such as services for downloading and uploading data to various servers connected to the Internet network, and various games and financial services.

In general, voice service, which is a real-time service, is very important in real time. Similar real-time services are also very sensitive to service latency. Therefore, in order to provide a delay-sensitive pseudo real-time service as described above, the wireless communication system performs communication using a separate protocol.

In more detail, in order to provide a video or audio streaming service through the Internet, RFC 1889, a standard protocol, defines and uses a real time transport protocol (hereinafter, referred to as 'RTP'). In addition, RFC 1889 defines an RTP control protocol (hereinafter referred to as RTCP) together with the RTP to provide a video or audio streaming service through the Internet. Therefore, in the wireless communication system, in order to provide data services, packet data services are provided using RTP and RTCP.

On the other hand, when providing a packet data service in a wireless communication system, there is a case where a transmitted packet is lost or cannot be restored normally in a demodulation and decoding process after reception according to a wireless channel environment. This may occur in a rapidly changing wireless environment or in various other cases. When data transmitted as described above is lost or demodulation and decoding fail, various methods for improving the quality of service by retransmitting the data are used.

After the packet data is transmitted by the transmitter of the wireless communication system, it is not known whether the transmitted packet is normally received or lost. Therefore, the receiver informs whether the transmitted packet is normally received, and one of these methods is a method of using a NACK signal due to RTP packet loss. The standard for indicating whether a loss has occurred in the transmitted RTP packet is defined in the above-described standard standard, and a method using the H.264 standard is used.

FIG. 1 is a diagram illustrating a message standard currently used for notifying whether a packet transmitted from a receiver is lost.

The transmission standard shown in FIG. 1 is a form of a message for notifying lost packets defined in RFC 2032 and H.264. Referring to the information shown in FIG. 1, the type of RC 102 and a load indicating the information of padding 101 and the number of reception blocks included in the RTCP packet is lost packet information of RTCP. The notification includes "PT = RTCP_NACK" and length information (Length) 104. And an SSRC 105 which is an RTCP synchronization source identifier. And a first sequence number (FSN) 110 of the last lost packet and bit mask information (BLP) 111 of the lost packet.

Therefore, the receiver may provide the sequence number of the first packet among the packets which did not receive the packet or failed to demodulate or decode, and the reception information of subsequent packets. This will be described with reference to FIG. 2.

FIG. 2 is a diagram for distinguishing between a packet lost and a packet normally received when a packet is transmitted in a wireless communication system.

In FIG. 2, lost packets are indicated by hatching. Thus lost packets are 200, 202, 203, 206, 207, 208, 209, 213, 214. In order to designate such lost packets, the FNS 110 has a value of 200, and the BLP 111 values are represented as "0110011110001100". In this case, a value of "0" indicates that no packet is lost, and a value of "1" indicates that a packet is lost.

In the case of notifying the lost packet by the above-described method, there is a problem that it is difficult to notify this when the amount of lost packets is large. That is, a method of notifying the lost packet using the above method is that the location where the value of the FSN 110 is present notifies the lost packet. The location of the remaining lost packets may indicate whether one bit is lost by using a BLP 111 value from the packet after the FNS. Therefore, since the value of the BLP 111 has a total of 16 bits, 16 values can be reported. That is, there is a problem in that only 17 packets can be designated using the FSN 110 and the BLP 111 when transmitting a single message. In addition, in the case of a high speed packet, as described above, a large amount of packets are continuously transmitted to a specific terminal. However, if the lost packet is notified in the above manner, there is a problem that it is difficult to notify when more than 17 packets are lost.

In addition, in a wireless communication system, packets are generally continuously errored. This is because the change of the wireless channel situation does not occur rapidly. However, when the above method is used, there is a problem in that it is not possible to adequately inform the error that occurs continuously.

On the other hand, with the recent development of technology, the function of the wireless terminal has been greatly developed. Older wireless terminals only provided a scheme for voice communication or data communication only. Nowadays, however, wireless terminals are evolving to provide various functions beyond just voice or data communication. For example, when a live broadcast or streaming data service is provided, a recording function may be provided to store the data to be played later, and the audio can be listened to at any time by storing various music files desired by the user in the wireless terminal. It is being developed in various forms such as regeneration technology.

If the situation of the wireless channel becomes poor when receiving live broadcast or streaming data service among the above technologies, the packet may be lost. In the case of receiving such a lost packet, the wireless terminal cannot receive normal data, and thus is forced to receive a stopped state or abnormal service due to video or audio interruption. This phenomenon occurs equally when a user wants to watch or listen to a recording without watching or listening to a specific service in real time. That is, if there is a packet lost due to instability of the wireless channel state, the user is forced to receive a service having a deteriorated quality of service (QoS) when playing a recorded service later.

Accordingly, an object of the present invention is to provide an apparatus and method for accurately reporting a lost packet in a packet data wireless communication system.

Another object of the present invention is to provide an apparatus and method capable of reporting a large amount of lost packets in a packet data wireless communication system.

It is still another object of the present invention to provide an apparatus and method for notifying the loss of packets that occur continuously in a packet data wireless communication system.

Accordingly, another object of the present invention is to provide a method for retransmitting a lost packet in a wireless terminal of a data wireless communication system.

Another object of the present invention is to provide a method for providing a data service having a good quality of service in a data wireless communication system.

In accordance with a first aspect of the present invention, an apparatus for reporting a lost packet in a data wireless communication system includes: converting a radio signal into a baseband signal and outputting the data to be transmitted; A wireless communication unit for converting the signal into a transmission band, a data processor for receiving and demodulating and decoding the baseband signal, encoding and modulating data to be transmitted, and reporting error information of the received packet, and a packet lost from the data processor. Collect information of the packet; and generate a loss report message with the last sequence number of the lost packet consecutively with the first sequence number of the lost packet when a report time of a predetermined lost packet arrives; And a control unit controlling to transmit the loss report message through a wireless communication unit.

In accordance with a second aspect of the present invention, an apparatus for reporting a lost packet in a data wireless communication system is provided. The apparatus converts a radio signal into a baseband signal and outputs the data to be transmitted. A wireless communication unit for converting the signal into a transmission band, a data processor for receiving and demodulating and decoding the baseband signal, encoding and modulating data to be transmitted, and reporting error information of the received packet, and a packet lost from the data processor. Collecting information of the packet, and generating a loss report message after generating a predetermined lost packet reporting time and generating a length of the lost packet from the first sequence number and the first sequence number of the lost packet consecutively. Control to transmit the loss report message through a data processor and the wireless communication unit It includes.

According to a first aspect of the present invention, there is provided a method for reporting a lost packet in a data wireless communication system, the method comprising: collecting information of a lost packet; Generating a loss report message with the last sequence number of the lost packet consecutively with the first sequence number of the lost packet when the report time of the packet arrives, and transmitting the generated loss report message. .

According to a second aspect of the present invention, there is provided a method for reporting a lost packet in a data wireless communication system, the method comprising: collecting information of a lost packet; Generating a loss report message when the report time of the packet arrives, and generating a loss report message from the first sequence number of the lost packet and the length from the first sequence number to the packet consecutively lost; and transmitting the loss report message. Include.

In accordance with another aspect of the present invention, there is provided a method of requesting retransmission of a lost packet in a wireless terminal of a data wireless communication system, the method comprising: checking loss of a received, decoded and demodulated packet; Generating a retransmission request message for retransmission of the lost packet when the lost packet exists, and transmitting the retransmission request message in a special profile extension message of the real-time transport protocol message. In addition, when the packet is recorded in the wireless terminal, the processes may be performed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, specific details appear in the following description, which is provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific matters. Will be self-evident. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a schematic block diagram of a portable terminal according to an exemplary embodiment of the present invention. Hereinafter, a block configuration and operation of a portable terminal for notifying packet loss according to the present invention will be described in detail with reference to FIG. 3. In addition, the operation for retransmission of the lost packet and the operation for storing and recording the retransmitted packet will be described in detail with reference to FIG. 3.

The wireless communication unit 301 converts a signal of a predetermined frequency band received from a base station (BS) through an antenna ANT into a baseband signal and outputs the signal, and converts a signal to be transmitted into a signal of a predetermined frequency band. Transmit to the base station through the antenna ANT. The wireless communication unit 301 may use a superheterodyne method when converting the received signal into a baseband signal, or may use a direct conversion method. The embodiment of the present invention does not limit this conversion scheme.

The data processor 303 demodulates and decodes the signal converted into the baseband to distinguish the data to be provided to the user from the control data. The data to be provided to the user among the divided data are output to the speaker SPK or to the display unit 307 respectively or simultaneously. In the case of control data, the control data is output to the controller 311 to be used for controlling the mobile terminal. Such control data may be various signals such as signaling signals, session establishment and release. In an embodiment of the present invention, no limitation is placed on these control signals, and no channel is used.

In addition, the data processing unit 303 encodes and modulates a lost packet indication message and a retransmission request message of lost and delayed packets according to the present invention to be described later under the control of the control unit 311 and transmits the same to the base station. The data processor 303 may include a transmitter for encoding and modulating a signal transmitted through the radio communication unit 301, and a receiver for demodulating and decoding the received signal. Accordingly, the data processor 303 may include a modem and a codec. The codec includes a data codec for processing packet data and an audio codec for processing an audio signal such as voice. The data codec performs encoding of a received packet when recording is performed according to the present invention.

Memory 305 includes Read Only Memory (ROM), Random Access Memory (RAM) or any other storage medium. The memory 305 includes an area for storing control data and various user data necessary for the operation of the portable terminal. In this case, the user data refers to information such as a phone number and a text message stored by the user, and the control data refers to control data necessary for incoming / outgoing calls from a mobile terminal, control data necessary for signaling, and various application programs. And control data necessary for the indication of the lost packet according to the present invention. The memory 305 also stores packet data when recording packet service data. In this case, the stored packet data may be encoded for recording.

The display unit 307 provides various information to the user, such as the current state of the portable terminal, the operation mode or time information being performed, under the control of the controller 311. In addition, the display unit 307 displays the video information when the received packet includes a video on demand (VOD) service packet or video information. The display unit 307 generally includes a liquid crystal display (LCD), but the display unit 307 is not limited to the liquid crystal display device in the present invention.

The key input unit 309 generally has a matrix structure in the form of a keypad, and generates a key signal input by a user and provides it to the controller 311. In addition to the key matrix structure, the key input unit 309 may be configured by a touch pad or a voice signal recognition. The key input unit 309 may be configured to input a specific signal to the controller 311. Therefore, the key input unit 309 does not necessarily need to be a keypad structure matrix.

The control unit 311 may drive a control operation necessary for communication in the portable terminal, an application program according to a user's request, and may include a function of the data processing unit 303. In addition, the control unit 311 controls the control for transmitting lost packet indication information and the request for retransmission of the lost and delayed packets when receiving the data packet and performing recording according to the present invention to be described below, Performs control of the recording operation.

1. How to Indicate Lost Packets

First, a method of indicating a lost packet according to the present invention will be described. The lost packet indication method according to the present invention is largely classified into two types. Each of the two lost packet indication methods has modified embodiments, which will be described in detail below.

4 is a diagram illustrating a format of a message for indicating a lost packet according to a first embodiment of the present invention.

Before describing FIG. 4, since the functions are the same as those of FIG. 1 described with reference to FIG. 4, the description thereof will be omitted.

Referring to FIG. 4, the first embodiment of the present invention is suitable for a case where an error occurs in several places of several received packets consecutively. An area of reference numeral 410 is a field indicating a first sequence number among sequence numbers of respective packets, and an area of reference numeral 430 is a field indicating a last sequence number among sequence numbers of respective packets.

For example, assuming that an error has occurred between sequence numbers 21 to 25 and sequences 46 to 52 while sequence numbers of the transmitted packets are transmitted from 0 to 100, the field is field 411. The message is composed of 431 fields, 413 fields, and 433 fields. That is, a sequence number corresponding to No. 21 is input in the 411 field and a sequence number corresponding to No. 46 is input in the 413 field. In addition, sequence number 25 is input in field 431, and sequence number 52 is input in field 433.

That is, in the first embodiment of the present invention, the lost packet may be notified of the received packets even when not 17 consecutive numbers. In addition, since the above fields can be added in a larger number, there is an advantage in that more information can be transmitted.

5 is a diagram illustrating a format of a message for indicating a lost packet according to a second embodiment of the present invention.

Prior to the description of FIG. 5, the same parts as those of FIG. 1 described in the related art are the same in FIG. 5, and thus description thereof will be omitted.

Referring to FIG. 5, first, in the second embodiment of the present invention, the received packets are suitable when an error occurs continuously at a specific point. Reference numeral 510 denotes a field indicating the first sequence number of the received packet, and reference numeral 530 denotes the number of packets consecutively generated from the first sequence number.

For example, if a sequence number of a transmitted packet fails to receive a packet of sequence numbers 21 to 40 while being transmitted from 0 to 100 times, the sequence number 21 is written in the first sequence number 510. In the length information, since the number of losses is 20 in the first sequence, a value corresponding to 20 may be set.

That is, in the second embodiment of the present invention, even when 17 or more consecutive occurrences occur, there is an advantage that a packet lost by one information transmission can be notified.

In addition, the second embodiment of the present invention can be extended as in the first embodiment. That is, if packets are lost from the 11th packet to the 19th packet and the packets are lost from the 21st packet to the 29th packet during transmission of packets having sequence numbers from 0 to 100, As in the first embodiment, in order to transmit two pieces of lost information, after the reference numeral 530, a new field may be set in the same manner as in the second embodiment to expand and inform the lost packet. In addition, in the first embodiment, it is a matter of fact that the lost packet can be extended as in the second embodiment.

6 is a control flowchart when reporting a lost packet in a mobile terminal according to an embodiment of the present invention.

Referring to FIG. 6, the controller 311 receives a packet transmitted from the base station in step S601. This reception process controls the wireless communication unit 301 to receive a signal of a corresponding band, control to adjust gain, and control conversion to a baseband signal.

Next, the control unit 311 performs demodulation and decoding of the packet received in step S601. In the demodulation and decoding process, the control unit 311 controls the data processing unit 303 to perform demodulation and decoding according to a previously negotiated method, and if there is an error in the received packet, stores the sequence number thereof. do.

In general, a wireless communication system adopts a hybrid automatic retreatment (H-ARQ) method for fast retransmission. However, even if retransmitted using the H-ARQ scheme, there may be a packet that fails to decode. In this way, even when retransmitted using the H-ARQ scheme, if the decoding fails, the unsent sequences are stored. However, the present invention does not necessarily require retransmission of the H-ARQ scheme, which is merely an additional matter.

The control unit 311 receives and demodulates and decodes the packet as described above, stores the sequence number of the lost packet, and proceeds to step S603 to check whether a lost packet report time arrives.

When the set time (or the number of packet receptions) for reporting a packet lost as a result of the check in step S603 passes, the controller 311 proceeds to step S605, otherwise, proceeds to step S601 to collect a packet. The operation of receiving, demodulating and decoding is continuously performed.

Next, when proceeding to step S605, the control unit 311 generates and transmits a lost packet using a method previously negotiated or prescribed by the wireless communication system among the methods of the first embodiment or the second embodiment described above. .

Details of the method of the first embodiment, the extension of the first embodiment, the method of the second embodiment, and the extension of the second embodiment are the same as those described with reference to FIGS. 4 and 5.

Next, the control unit 311 generates a loss packet report message by the above-described method, and provides it to the data processor 303. The control unit 311 controls the data processing unit 303 to decode and demodulate in a previously negotiated manner, and transmits it to the base station through the wireless communication unit 301.

2. Request for retransmission of lost packets and recording method

Hereinafter, an operation of requesting and recording a retransmission of a lost packet will be described.

7 is a diagram illustrating a format of a message for retransmission of a lost packet according to an embodiment of the present invention.

In FIG. 7, the same part will not be described since the RTCP uses a reception report (RR) message as described in the prior art. That is, since eight octets header of the reference numeral 701 is the same as described in the prior art, description thereof will be omitted.

First, a message according to the present invention is largely divided into a header part 701 and a report block part. The message according to the invention is included in the report block part. Next, each field of the report portion will be described below.

The message shown in FIG. 7 includes a field 710 for source identification of 32 bits after an 8 octet header 701 and a fraction lost field 711 for notifying the loss of an 8 bit RTP data packet. ), A 24-bit lost packet number field 712 indicating the total number of RTP lost packets, and a received highest sequence number field 713 consisting of 32 bits. The highest sequence number field 713 may divide 32 bits into upper 16 bits and lower 16 bits, the upper 16 bits indicate a sequence number circle count value of the sequence number, and the lower 16 bits indicate a received packet. Means the highest value among the sequence numbers.

In addition, the report block may include a 32-bit arrival jitter field 714 measuring variation in RTP data packet transmission / reception time and an intermediate 32-bit field of the most recently received Send Report Network Time Protocol (NTP). 715 and a field 716 and a special profile extension field 717 having a time when the most recently received SR was received and a time delay value for transmitting the received report packet. The field 718 may be padded according to the size of the message. When the SR is not received in the fields 715 and 716 related to the SR, the SR has a value of "0". In addition, the field 716 indicating the delay time indicates the delay time by configuring 32 bits in units of 1/65536 seconds when the information is transmitted in 32 bits. This value is determined by the clock provided by the system and can be changed to another value.

In the message format having the above-described configuration, the special profile extension field 717 may be used to request retransmission of lost or delayed packets according to the present invention. Next, the format of the retransmission request message according to the present invention using the special profile extension field 717 will be described in more detail with reference to FIG. 8.

8 is a detailed structural diagram of a retransmission request message of a lost or delayed packet according to an embodiment of the present invention.

As shown in FIG. 8, a retransmission request message (RRM) of a lost or delayed packet includes a field 801 indicating a message format of 1 byte and a sequence number indicating a sequence number to start retransmission of 2 bytes ( 802 and a field 803 indicating the length of one byte. That is, it consists of a field 802 indicating the first sequence number of the packets that need to be retransmitted, and a length field 803 indicating the number of lost or delayed packets.

Such a message format may use the two embodiments of the lost packet indication method described above, or may use a conventional method. The specific format of the message is not limited here.

9 is a control flowchart of recording a lost packet in a wireless terminal of a data wireless communication system according to an exemplary embodiment of the present invention. Hereinafter, a control process for recording lost packets in the wireless terminal according to the present invention will be described in detail with reference to FIG. 9.

First, it is assumed that the wireless terminal according to the present invention is performing a recording mode while receiving packet data. 9 is a diagram drawn under this assumption. Therefore, the controller 311 of the wireless terminal controls the wireless communication unit 301 and the data processing unit 303 in step S901 to receive the RTP packet, and performs demodulation and decoding of the received packet. When demodulation and decoding of the received packet is completed, the controller 311 proceeds to step S903 and checks whether the received packet is a retransmission packet. In this way, the method for checking whether the packet is retransmitted can be confirmed using the sequence number of the received packet. If the received packet is the retransmission packet in step S903, the controller 311 proceeds to step S911, and if it is not the retransmission packet, proceeds to step S905.

First, the case proceeds to step S905. In step S905, the controller 311 checks whether a lost packet has been lost. This check ignores the packet loss of the physical layer and checks whether the packet loss of the RTP layer. That is, packet loss through the physical layer is generally because retransmission can be performed using a hybrid automatic retransmission (H-ARQ) method. If the packet loss occurs as a result of the check in step S905, the flow proceeds to step S907; otherwise, the flow proceeds to step S915.

If packet loss occurs and the process proceeds from step S905 to step S907, the controller 311 stops recording and checks the amount of the buffer for recording. That is, since the received packets must be stored sequentially when the recording is performed, when the lost packet exists, the recording is stopped until the lost packet is received. The reason for checking the buffer amount is that in case of the RTP packet, when the lost packet is detected, the decoded sequence number is used. When the lost packet occurs continuously, the packet is normally received after the continuously lost packet. This is because it is impossible to detect the data until the packet is stored.

The controller 311 generates the retransmission request message described with reference to FIG. 8 after step S907, generates the message in the message format of FIG. 7, and reports the message to the server connected to the wireless communication system. After that, the controller 311 proceeds to step S901.

On the other hand, if the retransmission packet is received as a result of the check in step S903, the controller 311 proceeds to step S911 and rearranges the retransmitted data in the recording buffer. As described above, the reordering is performed using the sequence number of the RTP packet. After performing the rearrangement as described above, the controller 311 proceeds to step S913 to check the buffer amount for recording and resume recording. That is, when the capacity of the buffer for recording is insufficient, it is necessary to cope with it accordingly. In the present invention, there is no limitation on the case where the capacity of the buffer for recording is insufficient.

Thereafter, the controller 311 proceeds to step S915 to perform encoding for recording of a received packet. In step S915, the same operation is performed even when packet loss does not occur in step S905. The encoding operation for recording the received packet refers to storing packet data in a format that can be provided by the wireless terminal. For example, if a format for storing a video or music file in a wireless terminal takes an MPEC file, the received packet is encoded accordingly. The encoding operation may be configured to be performed by the data codec of the data processor 303, or may use a separate codec (not shown in FIG. 3). In this way, the encoded data for recording is stored in the memory 305.

As described above, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, according to the method and apparatus for reporting a lost packet in the data wireless communication system proposed by the present invention, there is an advantage of accurately reporting a lost packet in the wireless communication system. In addition, according to the present invention there is an advantage that can report the loss of packets that occur continuously in a packet data wireless communication system. That is, according to the present invention, even if various packets are lost, there is an advantage of notifying the transmitter of the lost packet appropriately regardless of the type of the lost packet.

Claims (12)

An apparatus for reporting a lost packet in a data wireless communication system, the apparatus comprising: A wireless communication unit which converts and outputs a radio signal into a baseband signal and converts data to be transmitted into a transmission band; A data processor for receiving and demodulating and decoding the baseband signal, encoding and modulating data to be transmitted, and reporting error information of the received packet; Collects the information of the lost packet from the data processing unit, and when a predetermined report time of the lost packet arrives, generates a loss report message with the last sequence number of the lost packet consecutively with the first sequence number of the lost packet And a control unit controlling to transmit the loss report message through the data processing unit and the wireless communication unit. The method of claim 1, In the case of generating the loss report message, if there is more than one packet that has been continuously lost, the loss report message further includes a sequence number of each first packet and a sequence number of the last packet among each packet that has been continuously lost. Loss packet indicating device in a data wireless communication system, characterized in that for generating. An apparatus for reporting a lost packet in a data wireless communication system, the apparatus comprising: A wireless communication unit which converts and outputs a radio signal into a baseband signal and converts data to be transmitted into a transmission band; A data processor for receiving and demodulating and decoding the baseband signal, encoding and modulating data to be transmitted, and reporting error information of the received packet; Collect the information of the lost packet from the data processing unit, and when the reporting time of the predetermined lost packet arrives, the length from the first sequence number and the first sequence number of the lost packet to the consecutive lost packet is lost. And a control unit for generating a report message and controlling the transmission of the loss report message through the data processor and the wireless communication unit. The method of claim 3, If there is more than one packet that has lost continuously during the generation of the loss report message, the sequence number of each first packet of each packet that has lost continuously and from the first sequence number to the packet sequence number where the loss occurred. The packet loss indicating device in the data wireless communication system, characterized in that the length further comprises the loss report message. A method for reporting lost packets in a data wireless communication system, the method comprising: Collecting information on lost packets; Generating a loss report message having a last sequence number of a lost packet consecutively with the first sequence number of the lost packet when a report time of a predetermined lost packet arrives; Loss packet indication method in a data wireless communication system comprising the step of transmitting the generated loss report message. The method of claim 5, In the case of generating the loss report message, if there are two or more packets which have been continuously lost, the loss report message further includes a sequence number of each first packet and a sequence number of the last packet in each of the consecutively lost packets. Loss packet indication method in a data wireless communication system, characterized in that. A method for reporting lost packets in a data wireless communication system, the method comprising: Collecting information on lost packets; Generating a loss report message having a length from the first sequence number and the first sequence number of the lost packet to the consecutively lost packets when a report time of a predetermined lost packet arrives; And transmitting the loss report message. The method of claim 7, wherein If there is more than one packet that has lost continuously when generating the loss report message, the sequence number of each first packet of each packet that has lost continuously and the length from the first sequence number to the packet sequence number where the loss occurred. And generating the lost report message by including the lost report message. A method for requesting retransmission of a lost packet in a wireless terminal of a data wireless communication system, Checking the loss of received, decoded and demodulated packets; Generating a retransmission request message for retransmission of the lost packet when the lost packet exists; And transmitting the retransmission request message in a special profile extension message of a real-time transport protocol message and transmitting the retransmission request message in a wireless terminal of a data wireless communication system. The method of claim 9, wherein the retransmission request message, And a field indicating a sequence number of a packet to be retransmitted and a length field indicating information of a packet to be retransmitted. . The method of claim 9, And retransmitting the lost packet in the wireless terminal of the data wireless communication system, when the packet is recorded in the wireless terminal. The method of claim 11, And stopping the recording operation until the lost packet is normally received when retransmission is required.

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