KR102334877B1 - reordering system and method for realtime transport protocol packet - Google Patents

Abstract

The present invention relates to a real-time transport protocol packet reordering system and a method thereof and, more particularly, to a real-time transport protocol packet reordering system and a method thereof for reordering a real-time transport protocol packet in an unaligned section. According to the present invention, by immediately acquiring a packet of the unaligned section based on unaligned section information of the real-time transport protocol packet, there is an effect of reordering packets without delay in data processing time.

Description

Real-time transport protocol packet reordering system and method

The present invention relates to a real-time transport protocol packet reordering system and method, and more particularly, to a real-time transport protocol packet reordering system and method for rearranging real-time transport protocol packets in an unaligned section.

Unlike TCP-based HTTP and FTP, which have general strict timing requirements, RTP is mainly designed for the purpose of transmitting media streams. perform mapping. The role of the timestamp has the function of integrating media provided from various data sources.

At this time, each transmitted packet has a time stamp together with a sequence number. The sequence number is a unique number different for each packet, and is used for detection and recovery of packet loss at the receiving end.

RTP is also a UDP-based protocol, and the receiving end cannot know whether the received data packets are transmitted in the proper order. Therefore, the receiving end must rearrange the packets using the packet sequence number.

In general, when receiving and processing real-time transport protocol packets, it may be required to rearrange packets for unaligned sections according to sequence numbers of real-time transport protocol packets.

Conventionally, when real-time transport protocol packets are rearranged for this unaligned section, data received from the RTP receiving end is buffered by a certain amount, and RTP packet rearrangement is performed using the buffered data. However, in the case of this method, there is a problem in that the data processing time is delayed by the size of the packet buffer.

KR10-1578047B1

The present invention was devised to solve such a problem, and it is an object of the present invention to provide a real-time transport protocol packet reordering system and method that enables packet rearrangement without delay in data processing time based on unaligned section information of real-time transport protocol packets. do it with

According to one aspect of the real-time transport protocol packet reordering system according to the present invention for achieving the above object, the real-time transport protocol packet of the unaligned section is requested when the unaligned section is detected by examining the order of the input real-time transport protocol packets. Client; and a real-time transport protocol caching server that transmits, to the client, a real-time transport protocol packet of an unaligned section requested from the client, wherein the client stores the real-time transport protocol packet received from the real-time transport protocol caching server in the unaligned section. It is possible to insert and rearrange them in sequence number, and to remove packets overlapping the real-time transport protocol packets inserted in the unaligned section.

In addition, the client includes: a packet inspection reordering unit for detecting an unaligned section by inspecting the order of the incoming real-time transport protocol packets; and a reordering packet requesting unit for requesting and receiving a real-time transport protocol packet of an unaligned section detected by the packet inspection reordering unit to the real-time transport protocol caching server, wherein the packet inspection reordering unit receives the unordered packet received from the reordering packet requesting unit. Real-time transport protocol packets in the sorted section are inserted and rearranged in sequence number in the unaligned section, packets overlapping with real-time transport protocol packets inserted in the unaligned section are removed, and the real-time transport protocol packets rearranged in the packet inspection reordering unit It may further include a real-time transport protocol packet processing unit to check and output the sequence number rearrangement status of the .

In addition, the real-time transport protocol caching server includes: a real-time transport protocol service stream buffering unit for buffering the real-time transport protocol service stream transmitted from the service network and storing the buffering information in a memory; a real-time transport protocol packet request information receiver configured to receive real-time transport protocol packet request information from a client; a real-time transport protocol packet position determining unit configured to determine a location by searching for the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from among the buffering information buffered by the real-time transport protocol service stream buffering unit; a real-time transport protocol packet acquisition unit for client transmission that acquires, from the real-time transport protocol stream buffering unit, the real-time transport protocol packet retrieved from the location determined by the real-time transport protocol packet position determining unit; and a real-time transport protocol packet transmitter configured to transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquisition unit for client transmission to the client.

Also, the real-time transport protocol service stream buffering unit may store buffering information in a main memory or a high-speed memory.

Also, the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from the client may include information on a start sequence number and an end sequence number of the packet.

In addition, the real-time transport protocol packet position determining unit stores the start sequence number and end sequence number information of the packets included in the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiving unit from the real-time transport protocol service stream buffering unit. The location can be determined by searching among the buffered buffering information.

In addition, the real-time transport protocol packet transmitter may transmit the real-time transport protocol packet to be transmitted to the client using a user datagram protocol method.

In addition, the real-time transport protocol caching server includes: a real-time transport protocol service stream buffering unit for buffering the real-time transport protocol service stream transmitted from the service network and storing the buffering information in a memory; a real-time transport protocol packet location information data generation and management unit for generating and managing location information of real-time transport protocol packets buffered by the real-time transport protocol service stream buffering unit and stored in a memory; a real-time transport protocol packet request information receiver configured to receive real-time transport protocol packet request information from a client; a real-time transport protocol packet position acquisition unit for acquiring a location of a requested real-time transport protocol packet from the real-time transport protocol packet position information data generation and management unit according to the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiving unit; a real-time transport protocol packet acquisition unit for client transmission that acquires, from the real-time transport protocol service stream buffering unit, a real-time transport protocol packet existing at a location of the real-time transport protocol packet acquired by the real-time transport protocol packet location information acquisition unit; and a real-time transport protocol packet transmitter configured to transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquisition unit for client transmission to the client.

In addition, the location information of the real-time transport protocol packet generated by the real-time transport protocol packet location information data generation and management unit may include sequence number information of the real-time transport protocol packet and location information of the packet for each sequence number.

In addition, the location information of the packet for each sequence number may include information on the first start location of the packet for each sequence number.

Also, the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from the client may include information on a start sequence number and an end sequence number of the packet.

In addition, the real-time transport protocol packet position acquisition unit determines the locations in the memory corresponding to the start sequence number and the end sequence number of the real-time transport protocol packet requested according to the real-time transport protocol packet request information received from the real-time transport protocol packet request information receiving unit. It can be obtained from the real-time transport protocol packet location information data generation and management unit.

In addition, the real-time transport protocol packet acquisition unit for client transmission obtains the real-time transport protocol packet existing at a location in the memory corresponding to the start sequence number and the end sequence number of the real-time transport protocol packet obtained by the real-time transport protocol packet position acquisition unit. It can be obtained from the real-time transport protocol service stream buffering unit.

On the other hand, according to one aspect of the real-time transport protocol packet reordering method according to the present invention for achieving the above object, the client checks the order of the input real-time transport protocol packets and, when detecting the unaligned section, the real-time transport protocol of the unaligned section requesting a packet; transmitting, by a real-time transport protocol caching server, a real-time transport protocol packet of an unaligned section requested from the client to the client; rearranging, by the client, inserting the real-time transport protocol packets received from the real-time transport protocol caching server into an unaligned section in sequence number; and removing, by the client, a packet overlapping with the real-time transport protocol packet inserted in the unaligned section.

In addition, the step of the real-time transport protocol caching server transmitting the real-time transport protocol packet of the unaligned section requested from the client to the client includes buffering the real-time transport protocol service stream transmitted from the service network and storing the buffering information in the memory. to do; receiving real-time transport protocol packet request information from the client; determining a location by searching for the received real-time transport protocol packet request information from among the buffered buffering information; acquiring a real-time transport protocol packet retrieved from the determined location; and transmitting the obtained real-time transport protocol packet to the client.

In addition, the step of the real-time transport protocol caching server transmitting the real-time transport protocol packet of the unaligned section requested from the client to the client includes buffering the real-time transport protocol service stream transmitted from the service network and storing the buffering information in the memory. to do; generating and managing location information of real-time transport protocol packets that are buffered and stored in a memory; receiving real-time transport protocol packet request information from the client; acquiring a location of a requested real-time transport protocol packet according to the received real-time transport protocol packet request information; acquiring a real-time transport protocol packet existing at a location of the acquired real-time transport protocol packet; and transmitting the obtained real-time transport protocol packet to the client.

According to the present invention, there is an effect that packets can be rearranged without delay in data processing time by immediately acquiring a packet of an unaligned section based on unaligned section information of a real-time transport protocol packet.

1 is a diagram illustrating an RTP packet structure for real-time transport protocol reordering (RTP reordering).
2 is a diagram illustrating a general real-time transport protocol packet reordering (RTP reordering) method in the RTP packet reception processing unit.
3 is a diagram showing the configuration of a real-time transport protocol packet reordering (RTP reordering) system according to an embodiment of the present invention.
4 is a diagram illustrating an example of a real-time transport protocol packet reordering (RTP reordering) method.
5 is a diagram illustrating a detailed configuration of a real-time transport protocol packet reordering (RTP reordering) system according to an embodiment of the present invention.
6 is a diagram illustrating a detailed configuration of a real-time transport protocol packet reordering (RTP reordering) system according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a diagram illustrating an RTP packet structure for real-time transport protocol reordering (RTP reordering).

As shown, looking at the real-time transport protocol packet structure, V (version) is 2 bits, which may indicate the version of the real-time transport protocol, and currently may always indicate a value of 2.

P (padding) is 1 bit and may indicate if there is one or more padding bytes at the end of the packet. Here, the padding bit may mean a meaningless bit, and may be a bit intentionally added to make a packet.

X (Extension) is 1 bit and may mean that there is one extension header after the fixed header.

CC (CSRC Count) is 4 bits and may indicate the number of CSRC identifiers displayed after the 12-byte fixed header.

M (Market) is 1 bit and can be used to indicate important events such as frame boundaries within a packet stream. It may always be an important bit when looking at troubleshooting, but it may be meaningless, and it is possible to remove the indication bit by expanding the PT field that follows.

PT (Payload Type) is 7 bits and may indicate the type of RTP payload. That is, information on whether the content transmitted by the RTP is in G.711 or H.264 can be indicated. Also, if the receiving equipment cannot understand the payload type, it MUST ignore it. This means that the actual payload type is always exchanged at the time of capability exchange, so mutual recognition must be made.

The sequence number is 16 bits and starts from a random number for security reasons, but may be increased by 1 whenever the number of packets increases. Through this, the receiving device can recognize the packet loss and operate a recovery mechanism.

The timestamp is 32 bits and may indicate the sampling moment of the first byte of the RTP packet. The initial value can be randomly determined like the sequence number, and if sampling occurs in 160 units, each block can be increased by 160 units. Since the sampling rate is different for each actual codec, it may increase accordingly.

The SSRC (Synchronization Source) identifier indicates a synchronization source as 32 bits and can be randomly determined, and must have different values within the same RTP session.

CSRC (Contributing Source) identifier is 32-bit and can be indicated when multiple sound sources are integrated into one through Audio Mixer. Therefore, the original sound source can be indicated through this field, and SSRC identifiers of all sound sources can be included in this list.

In particular, as the sequence number is a 16-bit value, packets can be rearranged by checking the order of the packets based on this value.

In the case of reordering, when data is transmitted using the RTP protocol over the network, the order of received packets at the receiver may not be sequentially received. In this case, for normal payload data processing, after buffering for a certain period of time, the order of packets can be accurately rearranged based on the sequence number, and then data processing can be performed. This process may be referred to as RTP packet reordering.

2 is a diagram illustrating a general real-time transport protocol packet reordering (RTP reordering) method in the RTP packet reception processing unit.

As illustrated, RTP packets may be input to the packet buffer 11 of the RTP packet reception processing unit 10 , and the order of the input RTP packets may be in an unaligned state. The packet buffer 11 may transmit the unaligned RTP packet to the packet reordering unit 12 to request packet reordering. The packet reordering unit 12 may rearrange the order of the RTP packets in an unaligned state transmitted from the packet buffer 11 , and may transmit the RTP packet order rearrangement state to the RTP packet processing unit 13 . That is, data received from the RTP receiving end may be buffered by a predetermined amount, and RTP packet reordering may be performed using the buffered data. However, in the case of this method, a data processing time delay corresponding to the size of the packet buffer 11 may occur.

3 is a diagram showing the configuration of a real-time transport protocol packet reordering (RTP reordering) system according to an embodiment of the present invention, and FIG. 4 is a diagram showing an example of a real-time transport protocol packet reordering (RTP reordering) method.

As shown, the real-time transport protocol packet reordering (RTP reordering) system of the present invention may include an RTP packet reception processing unit 20 and an RTP caching server 30 .

The RTP packet reception processing unit 20 may receive a real-time transport protocol packet, inspect the order of the packets, and when an unaligned state is detected, may request a real-time transport protocol packet for unaligned section information to the RTP caching server 30, and the requested real-time Transport protocol packets can be received and reordered.

The RTP caching server 30 may transmit the requested real-time transport protocol packet to the RTP packet reception processing unit 20 according to the request of the RTP packet reception processing unit 20 .

The RTP packet reception processing unit 20 may include a packet inspection reordering unit 21 , a reordering packet requesting unit 22 , and an RTP packet processing unit 23 .

When a real-time transport protocol packet is input, the packet inspection reordering unit 21 may check the sequence number of the input real-time transport protocol packet in real time to inspect the section information in an unordered state. Here, when the unaligned state of the real-time transport protocol packet is detected, the unaligned section information may be transmitted to the reordering packet request unit 22 to request the real-time transport protocol packet of the unaligned section.

When receiving the real-time transport protocol packet of the unaligned section requested from the reordering packet requester 22 , the packet inspection reordering unit 21 may rearrange the received real-time transport protocol packet of the unaligned section. Here, the packet rearrangement may be performed according to the sequence number of the real-time transport protocol packet.

When the reordering packet request unit 22 receives the real-time transport protocol packet request of the unaligned section from the packet inspection and reordering unit 21 , it may request the real-time transport protocol packet of the unaligned section from the RTP caching server 30 . Accordingly, upon receiving the real-time transport protocol packet of the unaligned section requested from the RTP caching server 30 , the received real-time transport protocol packet of the unaligned section may be transferred to the packet inspection reordering unit 21 .

The RTP packet processing unit 23 may receive the real-time transport protocol packet rearranged by the packet inspection reordering unit 21 and process the received real-time transport protocol packet.

As described above, according to the real-time transport protocol packet reordering system of the present invention, the sequence number of the RTP packet is checked in real time without buffering at the RTP receiving end, and a section in the unordered state is detected. can do.

In addition, the RTP caching server 30 can request a packet that can make the unaligned packet section a reorder section, and the RTP caching server 30 finds a packet section having a sequence number requested by the receiver in the data being cached. can be transmitted to the receiver.

Accordingly, the packet inspection reordering unit 21 of the RTP packet reception processing unit 20 inserts the real-time transport protocol packet received from the RTP caching server 30 into the unaligned state unit and then outputs it to the RTP packet processing unit 23 . have.

The packet inspection reordering unit 21 of the RTP packet reception processing unit 20 removes the corresponding packet when a packet having the same sequence number as the packet received from the RTP caching server 30 is found in the packet received thereafter. can do. In this case, the removed packet or the packet after the packet interval may be output according to the packet order.

The packet reordering method of the present invention can reduce the time delay compared to the basic method by removing buffering, which is a time delay element of the basic method, and allowing necessary packet information to be received from the caching server within an optimal time.

4 shows a specific example of a method for rearranging real-time transport protocol packets according to the present invention. In this regard, the packet inspection reordering unit 21 of the RTP packet reception processing unit 20 may detect a position where the sequence number SN is discontinuous during RTP packet reception. For example, as shown in FIG. 4 , packet misalignment may be detected by checking that the next order of 0x0001, 0x0002, 0x0003, 0x0004, 0x0005 is 0x0009 instead of 0x0006.

Accordingly, packet unaligned section information can be generated by deriving the start and end packet sequence numbers of the sequence number discontinuous section as a method of generating the requested section information. Here, the packet misalignment section information may be 0x0006 to 0x0008 corresponding to between 0x0005 and 0x0009.

Subsequently, as a request and reception method of the request interval packet, the sequence number information of the start and end packets of the sequence number discontinuous interval may be transmitted to the RTP caching server 30, and the sequence number discontinuous interval packet, which is the request interval packet, may be transmitted to the RTP caching server 30 ) can be received from For example, the request interval packets 0x0006 to 0x0008 may be received.

Subsequently, as a packet reordering method, the packet inspection reordering unit 21 of the RTP packet reception processing unit 20 may reorder the packets by inserting a request interval packet. For example, the packets may be rearranged by inserting them between 0x0005 and 0x0009 in the order of 0x0006, 0x0007, and 0x0008, which are request interval packets.

Subsequently, after the request interval packet is inserted, a packet overlapping with the inserted packet may be removed. For example, 0x0006, 0x0007, 0x0008 packets overlapping with the request interval packet may be removed after inserting the request interval packets in the order 0x0006, 0x0007, and 0x0008 between 0x0005 and 0x0009.

That is, the real-time transport protocol packet reordering (RTP reordering) method on the client side may first detect unaligned real-time transport protocol packets. For example, when an SN #9 packet is received from a real-time transport protocol packet in the order of SN #5 to SN #9, an unaligned real-time transport protocol packet may be detected.

Then, the unaligned section may be determined by detecting the unaligned real-time transport protocol packet. For example, the unaligned section may be determined as the SN #5 ~ SN #9 section.

Subsequently, after determining the unaligned section, the request packet information may be determined in a format such as [Start SN#, End SN#]. For example, when the unaligned section is determined to be SN #5 to SN #9, request packet information may be determined as Start (SN#6) to End (SN#8).

Subsequently, the client may transmit the determined request packet information to the server, and may receive the requested packet from the server. For example, it is possible to receive RTP packets (SN#6) to RTP packets (SN#8) from the server by transmitting Start (SN#6) to End (SN#8), which are determined request packet information, to the server. .

Subsequently, the client may insert the packet received from the server into the existing server receiving packet. For example, a packet RTP packet (SN#6) to RTP packet (SN#8) received from the server may be inserted into a packet RTP packet (SN#5) to RTP packet (SN#9) being received by the existing server. .

Subsequently, the client may delete a packet that overlaps with the packet received from the server. For example, when the packets received from the server are RTP packets (SN#6) to RTP packets (SN#8), overlapping packets RTP packets (SN#6) to RTP packets (SN#8) may be deleted. .

5 is a diagram illustrating a detailed configuration of a real-time transport protocol packet reordering (RTP reordering) system according to an embodiment of the present invention.

As shown, the real-time transport protocol packet reordering system of the present invention may include a client 100 and a real-time transport protocol caching server 200 for real-time transport protocol packet reordering.

The client 100 may transmit and request the real-time transport protocol packet request information of the unaligned section to the real-time transport protocol caching server 200, and receive the requested real-time transport protocol packet information from the real-time transport protocol caching server 200. can Here, the real-time transmission protocol packet request information may include, for example, start sequence number and end sequence number [Start SN#, End SN#] information as unaligned section information and may be transmitted.

The real-time transport protocol caching server 200 transmits the requested real-time transport protocol packet based on the start sequence number and the end sequence number [Start SN#, End SN#] information of the unaligned section according to the request of the client 100. can

The real-time transport protocol caching server 200 includes a real-time transport protocol packet request information receiving unit 210, a real-time transport protocol packet location determining unit 220, a real-time transport protocol service stream buffering unit 230, and a real-time transmission for client transmission. It may include a protocol packet acquisition unit 240 and a real-time transmission protocol packet transmission unit 250 .

The real-time transport protocol packet request information receiver 210 may receive real-time transport protocol packet request information from the client 100 . Here, the real-time transport protocol packet request information received from the client 100 may include information on a start sequence number and an end sequence number of the packet.

The real-time transport protocol packet position determining unit 220 searches for the real-time transport protocol packet request information received from the real-time transport protocol packet request information receiving unit 210 from among the buffering information buffered by the real-time transport protocol service stream buffering unit 230 and locates can be confirmed. That is, the real-time transport protocol packet position determining unit 220 converts the start sequence number and the end sequence number information of the packets included in the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver 210 to the real-time transport protocol service. The location may be determined by searching among the buffering information buffered by the stream buffering unit 230 .

The real-time transport protocol service stream buffering unit 230 may buffer the real-time transport protocol service stream transmitted from the service network and store buffering information in the memory. Here, it may be preferable to use a main memory or a high-speed memory as the memory in which the buffering information is stored.

The real-time transport protocol packet acquisition unit 240 for client transmission may acquire, from the real-time transport protocol service stream buffering unit 230 , the real-time transport protocol packet retrieved from the location determined by the real-time transport protocol packet position determining unit 220 .

The real-time transport protocol packet transmitter 250 may transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquirer 240 for client transmission to the client 100 in a user datagram protocol (UDP) method. Here, the request packet information may use TCP or other methods other than the user datagram protocol (UDP) method.

As described above, the server of the present invention may receive a service stream from a service network and perform buffering for a predetermined period. In this case, the buffering data may be stored and processed in the main memory or other high-speed memory, and may be stored in the main memory or disk. may be desirable.

Also, the server may receive RTP packet request information from the client. The RTP packet request information may be received in a format such as [Start SN#, End SN#], for example, RTP packet request information Start (SN#6) to End (SN#8) may be received.

Also, the server may determine the location by searching for corresponding sequence number (SN) packet information among the buffering information. As described below, when packet location information for each sequence number is separately generated and managed, a request packet can be acquired more quickly and with low complexity by using this information. That is, the server may obtain the searched real-time transport protocol packet from the buffering unit.

6 is a diagram illustrating a detailed configuration of a real-time transport protocol packet reordering (RTP reordering) system according to another embodiment of the present invention.

As shown, the real-time transport protocol packet reordering system according to another embodiment of the present invention may include a client 100 and a real-time transport protocol caching server 300 for real-time transport protocol packet reordering.

The client 100 may transmit and request the real-time transport protocol packet request information of the unaligned section to the real-time transport protocol caching server 300, and receive the requested real-time transport protocol packet information from the real-time transport protocol caching server 300. can Here, the real-time transmission protocol packet request information may include, for example, start sequence number and end sequence number [Start SN#, End SN#] information as unaligned section information and may be transmitted.

The real-time transport protocol caching server 300 transmits the requested real-time transport protocol packet based on the start sequence number and the end sequence number [Start SN#, End SN#] information of the unaligned section according to the request of the client 100. can

The real-time transport protocol caching server 300 includes a real-time transport protocol packet request information receiver 310, a real-time transport protocol packet position acquisition unit 320, a real-time transport protocol packet position information data generation and management unit 330, and a real-time transport protocol It may include a service stream buffering unit 340 , a real-time transport protocol packet acquisition unit 350 for client transmission, and a real-time transport protocol packet transmission unit 360 .

The real-time transport protocol packet request information receiver 310 may receive real-time transport protocol packet request information from the client 100 . Here, the real-time transport protocol packet request information received from the client 100 may include information on a start sequence number and an end sequence number of the packet.

The real-time transport protocol packet location acquisition unit 320 determines the location of the requested real-time transport protocol packet according to the real-time transport protocol packet request information received from the real-time transport protocol packet request information receiving unit 310. The real-time transport protocol packet location information data generation and management unit It can be obtained from (330). That is, the real-time transport protocol packet position acquisition unit 320 corresponds to the start sequence number and the end sequence number of the real-time transport protocol packet requested according to the real-time transport protocol packet request information received from the real-time transport protocol packet request information receiver 310 . The location on the memory to be used may be obtained from the real-time transmission protocol packet location information data generation and management unit 330 .

The real-time transport protocol packet location information data generation management unit 330 may generate and manage the location information of the real-time transport protocol packet buffered by the real-time transport protocol service stream buffering unit 340 and stored in a memory. Here, the location information of the real-time transport protocol packet may include sequence number information of the real-time transport protocol packet and location information of the packet for each sequence number. In addition, the location information of the packet for each sequence number may include information on the first start location of the packet for each sequence number.

The real-time transport protocol service stream buffering unit 340 may buffer the real-time transport protocol service stream transmitted from the service network and store buffering information in the memory.

The real-time transport protocol packet acquisition unit 350 for client transmission uses the real-time transport protocol packet existing at the location of the real-time transport protocol packet acquired by the real-time transport protocol packet position acquisition unit 320 into the real-time transport protocol service stream buffering unit 340 . can be obtained from That is, the real-time transport protocol packet acquisition unit 350 for client transmission exists at a location on the memory corresponding to the start sequence number and the end sequence number of the real-time transport protocol packet acquired by the real-time transport protocol packet position acquisition unit 320 in real time. The transport protocol packet may be obtained from the real-time transport protocol service stream buffering unit 340 .

The real-time transport protocol packet transmitter 360 may transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquirer 350 for client transmission to the client 100 .

In this way, the server of the present invention generates packet location information composed of sequence number (SN) information of a real-time transport protocol packet buffered for faster request section information acquisition and first start location information of a packet of the corresponding sequence number to obtain data can be managed with

That is, the server can obtain the requested packet information from the corresponding memory location with the shortest and minimum complexity by directly obtaining the location of the start and end packets requested from the client through the packet location information from the management data without performing a memory search. . For example, when the server receives the real-time transport protocol packet request information Start (SN#6) ~ End (SN#8) from the client, the server uses the packet location information for each sequence number to determine the location of the corresponding request packet in the main memory. can be confirmed

Accordingly, the server may acquire information existing at the determined start and end positions on the main memory, determine it as the request packet data, and transmit the determined request packet data to the client. In this case, the request packet data may be transmitted using the user datagram protocol (UDP) method as described above, or TCP or other methods may be used as another method.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

20: RTP packet reception processing unit
21: packet inspection reordering unit
22: reordering packet request unit
23: RTP packet processing unit
23 : RTP caching server

Claims (16)

a client comprising: a packet inspection reordering unit detecting an unaligned section by inspecting the order of input real-time transport protocol packets, and a reordering packet requesting unit requesting a real-time transport protocol packet of the unaligned section when detecting an unaligned section; and
A real-time transport protocol caching server for transmitting a real-time transport protocol packet of an unaligned section requested from the client to the client,
The reordering packet request unit transmits the real-time transport protocol packet received from the real-time transport protocol caching server to the packet inspection reordering unit,
The packet inspection reordering unit inserts and rearranges the delivered real-time transport protocol packets in an unaligned section in order of order number, and in subsequent incoming packets, overlapping packets having the same sequence number as the real-time transport protocol packets inserted in the unsorted section Real-time transport protocol packet reordering system that removes. The method according to claim 1,
the client,
a packet inspection reordering unit for detecting an unaligned section by examining the order of the input real-time transport protocol packets; and
and a reordering packet requesting unit for requesting and receiving a real-time transport protocol packet of an unaligned section detected by the packet inspection reordering unit to the real-time transport protocol caching server,
The packet inspection reordering unit inserts and rearranges real-time transport protocol packets in the unaligned section received from the reordering packet requester in sequence numbers in the unaligned section, and removes packets that overlap with the real-time transport protocol packets inserted in the unaligned section and
The real-time transport protocol packet reordering system according to claim 1, further comprising a real-time transport protocol packet processing unit for checking and outputting sequence number reordering status of real-time transport protocol packets rearranged by the packet inspection reordering unit. The method according to claim 1,
The real-time transport protocol caching server,
a real-time transport protocol service stream buffering unit for buffering a real-time transport protocol service stream transmitted from a service network and storing buffering information in a memory;
a real-time transport protocol packet request information receiver configured to receive real-time transport protocol packet request information from a client;
a real-time transport protocol packet position determining unit configured to determine a location by searching for the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from among the buffering information buffered by the real-time transport protocol service stream buffering unit;
a real-time transport protocol packet acquisition unit for client transmission that acquires, from the real-time transport protocol service stream buffering unit, the real-time transport protocol packet retrieved from the location determined by the real-time transport protocol packet position determining unit; and
and a real-time transport protocol packet transmitter configured to transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquisition unit for client transmission to the client. 4. The method according to claim 3,
The real-time transport protocol packet reordering system, wherein the real-time transport protocol service stream buffering unit stores buffering information in a main memory or a high-speed memory. 4. The method according to claim 3,
The real-time transport protocol packet reordering system, characterized in that the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from the client includes information on a start sequence number and an end sequence number of the packet. 6. The method of claim 5,
The real-time transport protocol packet position determining unit buffers the start sequence number and the end sequence number information of the packets included in the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver in the real-time transport protocol service stream buffering unit. A real-time transport protocol packet reordering system, characterized in that the location is determined by searching among buffering information. 4. The method according to claim 3,
The real-time transport protocol packet reordering system, characterized in that the real-time transport protocol packet transmitter transmits the real-time transport protocol packet to the client in a user datagram protocol method. The method according to claim 1,
The real-time transport protocol caching server,
a real-time transport protocol service stream buffering unit for buffering a real-time transport protocol service stream transmitted from a service network and storing buffering information in a memory;
a real-time transport protocol packet location information data generation and management unit for generating and managing location information of real-time transport protocol packets buffered by the real-time transport protocol service stream buffering unit and stored in a memory;
a real-time transport protocol packet request information receiver configured to receive real-time transport protocol packet request information from a client;
a real-time transport protocol packet position acquisition unit for acquiring a location of a requested real-time transport protocol packet from the real-time transport protocol packet position information data generation and management unit according to the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiving unit;
a real-time transport protocol packet acquisition unit for client transmission that acquires, from the real-time transport protocol service stream buffering unit, a real-time transport protocol packet existing at a location of the real-time transport protocol packet acquired by the real-time transport protocol packet position acquisition unit; and
and a real-time transport protocol packet transmitter configured to transmit the real-time transport protocol packet obtained by the real-time transport protocol packet acquisition unit for client transmission to the client. 9. The method of claim 8,
The real-time transport protocol packet location information generated by the real-time transport protocol packet location information data generation and management unit includes sequence number information of the real-time transport protocol packet and location information of the packets for each sequence number. system. 10. The method of claim 9,
The real-time transport protocol packet reordering system, characterized in that the location information of the packet for each sequence number includes information on the first start location of the packet for each sequence number. 10. The method of claim 9,
The real-time transport protocol packet reordering system, characterized in that the real-time transport protocol packet request information received by the real-time transport protocol packet request information receiver from the client includes information on a start sequence number and an end sequence number of the packet. 12. The method of claim 11,
The real-time transport protocol packet position acquisition unit determines the locations in the memory corresponding to the start sequence number and the end sequence number of the real-time transport protocol packet requested according to the real-time transport protocol packet request information received from the real-time transport protocol packet request information receiver in the real time A real-time transport protocol packet reordering system, characterized in that it is acquired from the transport protocol packet location information data generation and management unit. 13. The method of claim 12,
The real-time transport protocol packet acquisition unit for client transmission transmits the real-time transport protocol packet existing at a location in the memory corresponding to the start sequence number and the end sequence number of the real-time transport protocol packet acquired by the real-time transport protocol packet position acquisition unit in the real-time A real-time transport protocol packet reordering system, characterized in that it is obtained from a protocol service stream buffering unit. detecting, by the client, an unaligned section by examining the order of the real-time transport protocol packets input through the packet inspection reordering unit;
requesting, by the client, a real-time transport protocol packet of the unaligned section when the unaligned section is detected through the reordering packet requesting unit;
transmitting, by a real-time transport protocol caching server, a real-time transport protocol packet of an unaligned section requested from the client to the reordering packet request unit of the client;
transferring the real-time transport protocol packet received from the real-time transport protocol caching server by the reordering packet request unit of the client to the packet inspection reordering unit;
reordering, by the packet inspection reordering unit, by inserting the delivered real-time transport protocol packets in an unaligned section in sequence number; and
and removing, by the client, a duplicate packet having the same sequence number as that of a real-time transport protocol packet inserted in an unaligned section from a subsequent packet. 15. The method of claim 14,
The step of the real-time transport protocol caching server transmitting the real-time transport protocol packet of the unaligned section requested from the client to the client,
Buffering a real-time transport protocol service stream transmitted from a service network and storing buffering information in a memory;
receiving real-time transport protocol packet request information from the client;
determining a location by searching for the received real-time transport protocol packet request information from among the buffered buffering information;
acquiring a real-time transport protocol packet retrieved from the determined location; and
and transmitting the obtained real-time transport protocol packet to the client. 15. The method of claim 14,
The step of the real-time transport protocol caching server transmitting the real-time transport protocol packet of the unaligned section requested from the client to the client,
Buffering a real-time transport protocol service stream transmitted from a service network and storing buffering information in a memory;
generating and managing location information of real-time transport protocol packets that are buffered and stored in a memory;
receiving real-time transport protocol packet request information from the client;
acquiring a location of a requested real-time transport protocol packet according to the received real-time transport protocol packet request information;
acquiring a real-time transport protocol packet existing at the location of the acquired real-time transport protocol packet; and
and transmitting the obtained real-time transport protocol packet to the client.

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