Apparatus and method for transmit/receive bit stream online

 

The invention relates to a device and method for transmission and reception of the bit stream, through which the bitstream of video data stably transmitted through the effective use of two logical channels, when communication is established through logical channels during transmission of the bitstream of video data in a communication network. In the way the source is encoded to obtain a bit stream using a predetermined type of coding. Then the encoded bit stream is transmitted on each level communication Protocol, and the title of each level communication Protocol is added to the payload. The header is transmitted separately from the bit stream. The technical result achieved by the invention is in the monitoring and correction of bit errors in the transmission of information through each level. 4 C. and 11 C.p. f-crystals, 5 Il.

The present invention relates to a device and method for transmitting/receiving a bit stream in a network and, more particularly, to a device and method for transmit/receive bit stream, through which the bitstream of video data is stably transmitted in the network, including a wireless network and the network Intern is but the logical port, when a channel is selected for communication between two points. I.e., the packet Protocol (RTP Protocol (real-time), which is packaged using Protocol RFC Protocol (request for comments) via the Internet, is passed through the hierarchical structure of RTP/UDP/IP Protocol (real-time/user datagram Protocol/Internet Protocol) or RTP/TCP/IP (Protocol real-time/transmission control Protocol/Internet Protocol).

RTP/TCP/IP operates as confirmation of receipt and can transfer data stable way, so it is usually used for transmission of control information. RTP/UDP/IP works in the mode of absence confirmation of receipt and transmits video data, which usually must be processed in real time.

As shown in Fig.1, the transmitting terminal bitstream of video data sequentially subjected to processing at the application level (codec video source), the level of RTP, UDP/IP and TCP/IP level of the Protocol RLP (Protocol radio link), level 2 (L2) and level 1 (L1). At each level, to a bit stream of video data is added to the header information, and the bit stream of video data having header information transmitted using the RTP Protocol. In the receiving terminal bitstream of video data sequentially subjected to processing at the level of UDP/IP and TCP/IP, the RTP Protocol and application layer (codec video source) and is decoded in the video.

In Fig.2 presents an illustration of a typical method of transmitting and receiving data between the server and the client. First, the server 200 reads the bit stream of video data generated by the codec of the video source, for dividing the read bit stream of video data in the bitstream 210 high importance and bit stream 220 low importance for the formation of the stream of RTP. Then, the server 200 transmits the bitstream 210 high importance to the client 230 via RTP/TCP/IP, as shown by the arrow (1), and receives an acknowledgement indicating that the transmission bit stream 210 high significance completed without errors, as shown by the arrow (2). Then, the server 200 transmits the bit stream 220 low importance to the client 230 via RTP/UDP/IP, regardless of the errors, as shown by the arrow (3). The client 230 recovers from the bitstream 210 high importance and bit stream 220 low importance again the syntax of the original bit stream of video data.

As audiodannyh, for example, according to MPEG-4 or H. 263, can be passed to the UDP/IP. The level of UDP/IP can distinguish the completion of reception of all data transferred, because it operates in a mode without acknowledgment. If the packet bit stream is transmitted in the transmission medium, in which the Internet performs data exchange with the wireless network, packet data may have bit errors in the wireless transmission environment. I.e., the packet bit stream may have a propagation loss in the Internet, when it is processed in the transmission medium of the Internet and wireless transmission, and bit errors can be generated, even if the packet bit stream transmitted without loss. Here the packet bit stream includes a packet header and the header of the payload. If the bit error occurs in these headers, the receiving terminal cannot perform proper decoding.

If the bit stream of video data is transmitted in real time, the transmitting terminal classifies the bitstream of video data based on its importance, and transmits the first significant part, and then the less important part. At this point, the receiving terminal must delay data to Dana. I.e., if significant parts sequentially transmitted on the Internet and the wireless network, the network must be continuously stable. Also, if the bit stream is classified in accordance with the importance in the process of encoding source video data, it cannot be restored to get the packet bit stream that corresponds to the modern Protocol RFC. In addition, the server 200 and the client 230 should always preprocess (preprocessing) for the classification of the bitstream significance respectively for transmission and reception of the bit stream, and post-processing (post-processing) to restore the received bit streams of high and low importance in the original bit stream. Processing for the classification of the bit stream on the basis of significance before packaging can be performed only at the level of the video codec, which you already know the syntax of the bitstream of video data.

Therefore, the data transfer in the Internet in combination with the wireless transmission environment causes packet loss and bit errors, as described above, resulting in image quality degradation.

Detailed disclosure of the invention the present invention atlapetes effective use two logical channels, when the data transfer is determined by two logical channels during transmission of the bitstream of video data.

Another objective of the present invention is a device for transmitting and receiving a bit stream in which the bitstream of video data stably transmitted and received through the effective use of two logical channels when the data transfer is determined by two logical channels during transmission of the bitstream of video data.

To solve the first problem, a method for transmitting a bit stream in a communication network corresponding to a possible variant of implementation of the present invention, and the method includes: (a) the encoding of the source receiving the bitstream using a predetermined type of coding; (b) adding a header at each level of the Protocol to the payload when transmitting a bit stream encoded in step (a), for each level of the Protocol; and (C) transfer of title separately from the bit stream received from step (b).

To solve the first task is also provided a method of transmitting a bit stream in a communication network corresponding to the second variant of osushestvlyaetsya predefined type encoding and (b) adding a header at each level of the Protocol to the payload during transmission bit stream, encoded stage (a), for each level of the transmission Protocol, and a separate transmission of the payload and header.

For solving the second problem is provided by the device for transmission of the bit stream in a communication network in accordance with one embodiments of the present invention, the device comprises an encoder for encoding the source data to obtain a bit stream using a predetermined type of coding; block Protocol processing to add the title of each level communication Protocol to the payload when transmitting a bit stream encoded by the encoder at each level communication Protocol; and a processing unit packets for transmission bit stream processed by the processing unit Protocol Protocol mode without confirmation, sending and receiving header information Protocol mode with acknowledgement.

To solve the second task is also provided a device for transmission of the bit stream in a communication network in accordance with another embodiment of the present invention, the device comprises a block allocation for separate allocation of payload and header information that corresponds to the header madeover; and the processing unit packets for error detection, designed to determine whether the header information of the allocated block allocation, error, and if it is determined that the header information has an error, then resend request; block reorder the bit stream to rearrange the bit stream using the header information of the allocated block allocation, if it is determined that the header information has an error; and a decoder for decoding the bit stream, the rearranged block reorder the bit stream.

A brief description of the drawings Fig. 1 is a view illustrating a method of transmitting a bit stream of video data in the transmission medium standard N. 323; Fig. 2 is a view illustrating a method of transmitting and receiving a file between a server and a client in communication network; Fig. 3 is a block diagram of a transmission device of a stream of video data corresponding to the present invention; Fig. 4 is a block diagram of a device for relaying and receiving video data stream corresponding to the invention; Fig. 5 is a view illustrating a method of transmitting a bit stream of video data in a situation where the wireless network performs information exchange with the Internet.

The best mode of implementation from the indicate different types of standardized headings. When data is transmitted according to the Protocol real-time (RTP), using for each level of the Internet Protocol or the Protocol of the wireless network uses the transmission format. Accordingly, when using this method of encoding video data, the header of each level is added to the header of the payload at each level. Thus, only when the header of each level header and the payload are protected against bit errors, the receiving terminal can perform the appropriate decoding.

In accordance with Fig.3, block 310 video codec encodes data to obtain a bit stream using an application program, for example, standard N. 323. Block 320 Protocol processing transfers the bit stream, the encoded block 310 codec video data at each level of the communication Protocol and also adds the header of each Protocol to the payload. Block 330 packet processing pattisue bit stream processed by the block 320 Protocol processing, and transfers the packet bit stream Protocol user datagram (UDP) is a transport Protocol mode without acknowledgment, and transmits only the header information for Protamine block 330 packet processing transmits the payload among the bit stream processed by the block 320 Protocol processing on the transmission Protocol mode without confirmation of receipt and transmits only information added header Protocol transmission mode with acknowledgement.

In Fig. 4 presents a block diagram of a device for relaying and receiving video data stream in accordance with the present invention. According Fig.4, block 410 allocation of packet transfers on each level of the packet bit stream received from the transmission Protocol mode without a receipt or acknowledgment, and from packet bit stream separately allocated load and the title of each level. Block 412, the processing for error detection determines the presence or absence of errors in the header information of the allocated block 410 highlight packages. If it is determined that the header information has an error, then block 412, the processing for determining the error requests retransmission. On the other hand, if it is determined that the header has no errors, then block 420 reorder bitstream reorder the bit stream of video data using the header of each level, the selected block 410 highlight packages. Block 430 video codec is .5 shows the view illustrating the mode of transmission of the bitstream of video data in a situation where the wireless network is connected to the Internet. According Fig.5, the reference position 510 indicates the wireless terminal on the transmitting side, comprising a number of levels. The reference position 560 denotes a base station, which includes a number of levels; a reference position 570 denotes a means of providing internetworking, which includes a number of levels; and a reference position 580 denotes an Internet terminal at the receiving side, includes a number of levels.

The wireless terminal 510 contains the level 512 codec video source, which corresponds to the upper application layer, and sequentially includes a level 514 RTP level 516 TCP/IP, level 522 level Protocol radio link (RLP), 524 (MAC Protocol control access to the transmission medium), level 1 (L1), denoted by the reference position 526. As an application-level can be used multimedia codec other than the codec of the video source. The video data stream generates a packet consisting of a header and a payload, while passing through each level.

Level 512 codec video source encodes the source video is, the example corresponds to MPEG-4 or H. 263 to form a header 532 payload and payload 534 video data, as shown in line (a). Here the header 532 payload and payload 534 video data may be replaced by multimedia data. Then the level 514 generates RTP packet by adding a payload 545 video data with video data, header 544 payload and RTP header 543, and the level 516 UDP/IP or TCP/IP adds the IP header 541 and the UDP or TCP header 542 to the generated packet, as shown in line (b). Level 522 RTP and L2 524 type b2-header 551 and RLP header 552 to the package (b), as shown in line (C).

Then the bitstream of video data, which added to the header of each level is transmitted to the base station 560, which includes identical levels to the UDP or TCP. Bit stream (s) video data, including the headers, can be divided into a part which is transmitted using the UDP Protocol, which is a transport Protocol without acknowledgement, and a portion is transmitted using TCP, which is a transport Protocol with acknowledgement. As described above, the wireless terminal 510 of the IHO method bitstream of video data, appended with header information that is sent over UDP, and the header information is transmitted separately over TCP. When the bitstream is transmitted only over UDP, if the header information included in the bitstream, distorted, then at the receiving side is difficult to process the bitstream. Therefore, in order to prevent packet loss, the wireless terminal 510 individually pattisue the header of each level, i.e., L2-header 551, RLP header 552, IP-553 header, a UDP or TCP header 554, RTP header 555 and the header 556 payload, which is appended to the bit stream of video data after the bit stream passes through each level. At the same time, or if the requested re-transmission, the wireless terminal 510 consistently conveys the packaged headers TCP. Here, the TCP on request retransmission is performed in blocks of IP packets or RLP.

In the second embodiment, in order to solve the problem of delays that may occur in the transmission medium real-time bit stream of video data appended with header information that is sent over UDP, and the header information is packaged and transmitted separately ABM is the option, the bitstream of video data is divided into part a payload and a header part, and these parts are packaged separately. Part of the payload is transmitted via UDP, and at the same time part of the header separately transmitted over TCP. In another embodiment, the portion of the payload is transmitted via UDP, and at the same time part of the header separately transmitted over UDP. In another embodiment, to reduce transmission time, packet bitstream, except for the part from which the bit error is eliminated at the TCP Protocol level, can be transmitted on the UDP layer.

In the third method, if the bit stream transmitted on the TCP Protocol level, resubmitted a small number of times, the transmission channel is defined as a somewhat stable. Accordingly, a small bit stream transmitted over UDP, can be transmitted over TCP.

The base station 560 relays levels of wireless application Protocol, i.e. a Protocol layer RLP, L2 and L1 levels of the Internet Protocol, i.e., the level of UDP, the IP level and L1 (or ATM - asynchronous transfer mode) to tunnel the bit stream received from the wireless terminal 510. At this point, if requested to repeat the p>

The tool 570 secure exchange relays bit stream which has passed through the base station, i.e., UDP, IP and L1 levels of UDP or TCP, IP, and L1 to provide a pair with the terminal 580 Internet.

Terminal 580 of the Internet, which is a terminal device on the receiving side decodes the bit stream received from the funds 570 secure exchange through L1-level 576, the IP layer 572 and UDP or TCP level 566, RTP-level 564 and the level 562 codec video source. Terminal 580 Internet can properly decode the bitstream of video data, which probably has bit errors using stable with respect to errors means of encoding video data, accesses the payload and separately adopted header information, if the package is passed through the UDP level, has a bit error.

The present invention is not limited to the above-mentioned variants of implementation, and it is obvious that the experts in the art can make various modifications without changing the essence of the present invention. I.e., the present invention can be used in the case where the bit stream is transmitted in two directions in reuseashoe the invention can also be used in case when the codec of the source audio data is different from the codec of the video source, or codec source having the same function as the codec of the source audio data is stable with respect to errors tool coding for the header or function that is consistent with stable against errors means, i.e., adaptive multi-mode mobile audio device corresponding to the MPEG-4 standard, for a UMTS system, a speech codec, etc.

Also the above variant of implementation of the present invention may be written in the form of a program executable on computers, and can be implemented on a universal digital computers that execute the program from the recording media used in computers. The recording media include magnetic recording media (for example, ROM, floppy disk, hard disk, etc), recording media for optical reader (e.g., ROM, CD-ROM, DVD, etc) and such carrier, as the carrier wave (e.g., transmission through the Internet).

Industrial applicability In accordance with the present invention, as described above, the header information or the like information consistently per orrectional and check bit errors during transmission through each level. Also, in contrast to the known method for data transmission in accordance with the importance of the package, the application of the present invention can be processed regardless of the syntax of video data. In addition, in the transmission medium, where the information exchange is carried out by using the UDP Protocol bit stream that includes bit errors can be properly decoded by using separately the received header information using stable with respect to errors of the means.


Claims

1. The mode of transmission of the bit stream in a communication network, comprising (a) encoding the source for obtaining the bitstream using a predetermined type of encoding, (b) adding a header of each level communication Protocol to the payload when sending the bitstream, encoded in step (a), through each level of the communication Protocol and transmission header and bitstream, and the header is transmitted separately from the bit stream.

2. The mode of transmission of the bit stream in a communication network, comprising (a) encoding the source for obtaining the bitstream using a predetermined type of encoding and (b) dobavio on the stage (a), through each level of the communication Protocol and the transmission of the payload and the header, and the header is transmitted separately from the payload.

3. The method according to p. 1, wherein the bit stream to which you added the headers when passing each level communication Protocol is the Protocol mode without acknowledgment, and only the header information in the bit stream are transmitted separately by Protocol mode without confirmation or acknowledgment.

4. The method according to p. 2, characterized in that the payload in the bit stream which has passed through each level of the communication Protocol is the Protocol mode without acknowledgment, and added the header is transmitted separately by Protocol mode ACK.

5. The method according to p. 3 or 4, characterized in that if the number of times of retransmission of the packet bit stream transmitted to the Protocol mode transmission with confirmation of receipt, equal to or less than a predetermined number of times, the packet bit stream, which is transmitted through the Protocol mode without acknowledgment is transmitted by the Protocol mode with acknowledgement.

6. The method according to p. 3, characterized in that the packet bit stream, to Kohima with confirmation of receipt, and at the same time the header information in the packet bit stream is transmitted according to the Protocol mode ACK.

7. The method according to p. 4, characterized in that the payload in the packet bit stream which has passed through each level of the communication Protocol is the Protocol mode without acknowledgment, and at the same time the header information in the bit stream is transmitted according to the Protocol mode ACK.

8. The method according to p. 3, characterized in that the packet bit stream, to which were added the headers when passing each level communication Protocol is the Protocol mode without acknowledgment, and at the same time the header information in the packet bit stream is also passed to the Protocol mode without acknowledgment.

9. The method according to p. 3, characterized in that the packet of the bitstream to which you added the headers when passing each level communication Protocol is the Protocol mode without acknowledgment, and if a failure occurs in the transmission, the packet bit stream is resubmitted Protocol mode without confirmation or acknowledgment.

10. The method according to any of paragraphs.3-7, characterized in that the Protocol mode with confirmation of reception of the om user datagram (UDP).

11. The method according to any of paragraphs.3-9, characterized in that the Protocol mode with acknowledgement provides the re-transmission of individual data packets are Internet Protocol (IP) or individual protocols of the radio link (RLP).

12. The method according to p. 1 or 2, characterized in that the headers are the header, the payload, the header of the Protocol real-time (RTP) header, user datagram Protocol (UDP) or transmission control Protocol (TCP) header of the Internet Protocol (IP), the Protocol header line communication (RLP) and the heading of level 2 (L2), which are added after the passage of the packet bit stream each level.

13. The method according to p. 1 or 2, characterized in that the payload includes multimedia data.

14. Device for transmission of the bit stream in a communication network containing an encoder for encoding the source data to obtain a bit stream using a predetermined type of encoding processing unit of the Protocol to add the title of each level communication Protocol to the payload when transmitting a bit stream encoded by the encoder at each level communication Protocol, and the processing unit packets for transmission bit on what rmacie header Protocol mode without confirmation or acknowledgement.

15. Device for relaying and receiving a bit stream in a communication network containing block allocation for separate allocation payloads and header information that corresponds to the header of each level, when the transmission bit stream received over a separate transmission Protocol in a communication network, at each level, and the processing unit for error detection, designed to determine whether the header information of the allocated block allocation, error, and if it is determined that the header information has an error, the resend request unit reorder the bit stream to rearrange the bit stream using the header information, allocated block allocation, and a decoder for decoding the bit stream, the rearranged block reorder the bit stream.

 

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