CN102065372B - Method for transmitting data in broadcast mode and related device - Google Patents

Abstract

The invention discloses a method and a related device for transmitting data in a broadcast mode, which are used to solve the problem that the prior art cannot save transmission resources of a broadcast network under the condition of ensuring the correctness of the data to be transmitted. The method includes: the network side broadcasts the first data to the terminal; and receiving the current parameter value of the predetermined parameter of the terminal fed back by the terminal through the mobile communication network after receiving the first data, the said The predetermined parameters can reflect the data transmission quality of the broadcast network; when the network side subsequently broadcasts the second data to the terminal, it determines the packet loss recovery data corresponding to the second data according to the parameter value fed back by the terminal, and through the The mobile communication network sends the determined packet loss recovery data corresponding to the second data to the terminal.

Description

Method and related device for transmitting data in broadcast mode

technical field

The present invention relates to the technical fields of computer and communication, and in particular to a method for transmitting data in broadcast mode, a network side device and a terminal device.

Background technique

In order to reduce the problem of poor decoding effect when the receiving end subsequently decodes the transmitted data due to lost data packets or transmission errors when the network transmits data, various error control schemes have been proposed in the prior art to improve the reliability of network transmission sex. Automatic Repeat Request (ARQ, Auto Repeat Request) and Forward Error Correction (FEC, Forward Error Correction) are two common types of solutions.

The basic working principle of ARQ is: after the receiving end judges that the data is received correctly by calculating the check digit contained in the received data, it must send a confirmation message to the sending end, otherwise the sending end will retransmit The time interval repeatedly sends the sent data to the receiving end. The advantage of this scheme is that it can guarantee the correctness of the transmitted data, but on the other hand, it will also take up a lot of network resources and cause the transmission time to prolong, especially for the receiving end that has correctly received the data sent by the sending end, but due to Network transmission failure, the sending end does not receive the corresponding confirmation message sent by the receiving end, retransmitting data will waste limited network resources.

The basic principle of the FEC scheme is: when the sending end sends the data to be transmitted, it adds the corresponding packet loss recovery or redundant error correction data to the data to be transmitted and sends it together. When an error occurs in the data to be transmitted, data recovery and error correction can be performed according to the received corresponding redundant error correction data, so as to obtain correct data. The sending end can use different encoding methods and interleaving depths to determine the redundant error correction data or packet loss recovery data corresponding to the data to be transmitted that can achieve different data recovery effect levels (or called FEC packet loss recovery levels).

When the network side sends data to the terminal through the broadcast network, since there is no return channel for the terminal to feedback information to the network side, the network side cannot know the packet loss when the broadcast network transmits data, so the network side can only send the same message to all terminals. The same packet loss recovery data as the FEC packet loss recovery level.

Contents of the invention

The embodiment of the present invention provides a method of broadcasting data transmission to solve the problem of wasting network transmission resources by sending the same packet loss recovery data with the same FEC packet loss recovery level to all terminals in the prior art.

Correspondingly, the embodiment of the present invention also provides a network side device and a terminal device.

The technical scheme that the embodiment of the present invention provides is as follows:

A method of broadcasting data, comprising:

The network side broadcasts the first data to the terminal; and

receiving the current parameter value of the predetermined parameter of the terminal fed back by the terminal after receiving the first data, the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located;

When the network side subsequently broadcasts the second data to the terminal, according to the parameter value fed back by the terminal, the packet loss recovery data corresponding to the second data is determined, and

Sending the determined packet loss recovery data corresponding to the second data to the terminal.

A method of broadcasting data, comprising:

After receiving the first data sent by the network side in broadcast mode, the terminal determines the parameter value of its own current predetermined parameter, and the predetermined parameter can reflect the data transmission quality of the broadcast network; and

sending the determined parameter value of the predetermined parameter to the network side;

When the terminal receives the second data subsequently broadcast by the network side, it receives the packet loss recovery data corresponding to the second data sent by the network side, and the packet loss recovery data is a predetermined parameter sent by the network side according to the terminal. determined by the parameter values of ; and

Perform error correction processing on the received second data according to the packet loss recovery data.

A network side device, comprising:

a first sending unit, configured to broadcast the first data to the terminal;

The receiving unit is configured to receive the current parameter value of the predetermined parameter of the terminal fed back by the terminal after receiving the first data sent by the first sending unit, and the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located ;

The determining unit is configured to determine the packet loss recovery data corresponding to the second data according to the parameter value fed back by the terminal received by the receiving unit when the second data is subsequently broadcast to the terminal;

The second sending unit is configured to send the packet loss recovery data corresponding to the second data determined by the determining unit to the terminal through the mobile communication network.

A terminal device, comprising:

The determination unit is configured to determine the parameter value of its current predetermined parameter after receiving the first data sent by the network side in a broadcast manner, and the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located;

a sending unit, configured to send the parameter value of the predetermined parameter determined by the determining unit to the network side through the mobile communication network;

The receiving unit is configured to receive packet loss recovery data corresponding to the second data sent by the network side through the mobile communication network when receiving the second data subsequently sent by the network side in a broadcast manner, and the packet loss recovery data is It is determined by the network side according to the parameter value of the predetermined parameter sent by the terminal;

The packet loss recovery processing unit is configured to perform packet loss recovery processing on the received second data according to the packet loss recovery data corresponding to the second data received by the receiving unit.

The solution provided by the embodiment of the present invention uses the network side for each terminal, and determines the follow-up to the terminal according to the parameter value that reflects the data transmission quality of the broadcast network fed back by the mobile communication network after the terminal receives the data sent by the network side broadcast mode. When the terminal sends data in broadcast mode, it should send the packet loss recovery data corresponding to different FEC packet loss recovery levels, so that the terminal can perform error correction processing, so as to provide different error correction levels for different terminals in a targeted manner Lost packet recovery data realizes the purpose of saving broadcast network transmission resources under the condition of ensuring the correctness of the data to be transmitted.

Description of drawings

Fig. 1 is the flow chart of main realization principle of the embodiment of the present invention;

Fig. 2 is a schematic diagram of the system structure of an embodiment of the present invention;

FIG. 3 is a block diagram of a network side device in an embodiment of the present invention;

FIG. 4 is a block diagram of a terminal device in an embodiment of the present invention;

FIG. 5 is a schematic diagram of using RTP data packets to carry packet loss recovery data according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a network side device provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention.

Detailed ways

In order to ensure the correctness of the data transmitted by the broadcast network, at present, the network side can only add the same packet loss to the data to be transmitted at the same time when the data to be transmitted (such as video data, etc.) is delivered to all terminals through the broadcast network. Restoring data, because the communication quality of broadcast networks in different regions is different, if the network side chooses to send the data to be transmitted in order to ensure the correctness of the data to be transmitted received by users in regions with poor communication quality of the broadcast network Corresponding to higher FEC packet loss recovery level and large amount of packet loss recovery data, for users in areas with better broadcast network communication quality, precious broadcast network transmission resources are wasted; on the contrary, if the network side In order to save Broadcast network transmission resources, choose to send the data to be transmitted corresponding to the lower FEC packet loss recovery level, and the packet loss recovery data with less data volume, then for users in areas with poor communication quality on the broadcast network, it will not be possible to receive The received packet loss recovery data recovers the required transmitted data with satisfactory quality.

Therefore, in the prior art, the network side cannot provide different terminals with packet loss recovery data with different error correction levels in a targeted manner, so as to save broadcast network transmission resources while ensuring the correctness of the data to be transmitted.

The embodiment of the present invention proposes that after the terminal receives the data to be transmitted such as the video data sent by the network side through broadcasting, it determines its current communication quality information of the broadcast network according to the check code in the received data, and sends the The determined broadcast network communication quality information is sent to the network side through the message of the mobile communication network, and the network side receives the broadcast network communication quality information fed back by the terminal. The feedback broadcast network communication quality information is targeted to send packet loss recovery data with different FEC packet loss recovery levels to different terminals. For example, send packet loss recovery data with a lower FEC packet loss recovery level and less data volume to terminals with better communication quality on the broadcast network, and send FEC packet loss recovery level with higher FEC packet loss recovery level and data volume to terminals with poor communication quality on the broadcast network. Larger packet loss restores data, so as to save broadcast network transmission resources under the condition that the correctness of the data to be transmitted can be guaranteed.

The main realization principles, specific implementation modes and corresponding beneficial effects that can be achieved of the technical solutions of the embodiments of the present invention will be described in detail below in conjunction with each accompanying drawing.

As shown in Figure 1, the main implementation principle flow of the embodiment of the present invention is as follows:

Step 10, the network side broadcasts the first data to the terminal;

Step 20, after the terminal receives the first data sent by the network side in step 10, determine the parameter value of its current predetermined parameter, the predetermined parameter can reflect the broadcast network data transmission quality of the terminal's location, which can be Packet loss rate, bit error rate, etc.;

Step 30, the terminal sends the parameter value determined in step 20 to the network side, for example, sends the determined parameter value to the network side through a mobile communication network (signaling, message, short message, etc.), a wired network, etc.;

Step 40, when the network side subsequently needs to broadcast the second data to the terminal, according to the parameter value fed back by the terminal in step 30, determine the packet loss recovery data corresponding to the second data;

In step 50, the network side sends the packet loss recovery data corresponding to the second data determined in step 40 to the terminal when the second data is broadcasted.

Please refer to FIG. 2 , which is a working principle diagram of a network side device and a terminal device in a system for broadcasting data transmission provided by an embodiment of the present invention.

Accompanying drawing 3 is the module structure diagram of the network side equipment in the embodiment of the present invention, and the data flow direction is marked with the mode of the arrow in this figure; Accompanying drawing 4 is the module structure diagram of the terminal equipment in the embodiment of the present invention, in this figure The data flow direction is marked in the form of arrows, where the hollow arrow is the flow direction of video data, the thin dotted arrow is the flow direction of lost packet recovery data, and the thin solid line arrow is the flow direction of terminal feedback data. The main implementation principles of the method of the present invention will be described and illustrated in detail below in accordance with the above-mentioned inventive principles of the present invention, in conjunction with accompanying drawings 3 and 4 and specific examples.

The data sent by the network side to each terminal through broadcasting may be various types of data, including video data, audio data, data in picture format, etc. This embodiment uses video data as an example for introduction.

The network side will encode the video file to obtain a plurality of video data, including the first video data, the second video data and the third video data, and send the first video data to terminal A and terminal A through the broadcast network in broadcast mode. b. For example, the first video data may be sent to the terminal in a data packet conforming to a format of a transmission protocol with a time identifier and a sequence identifier, such as being carried in a format conforming to a real-time transport protocol (RTP, Real-time Transport Protocol) or other transmission It is sent to the terminal in a data packet in the protocol format.

After receiving the first video data broadcasted by the network side, terminal A decodes, obtains the serial number identification of the data packet, calculates the check digit contained in the first video data, etc., and determines the packet loss rate and bit error Rate and other predetermined parameter values that can reflect the quality of broadcast network data transmission, for example, terminal A determines that the current packet loss rate is 0.5%.

Similar to terminal A, terminal B decodes the first video data received by broadcast from the network side, obtains the serial number identification of the data packet, calculates the check digit contained in the first video data, etc., to determine The packet loss rate, bit error rate and other predetermined parameter values that can reflect the data transmission quality of the broadcast network, for example, terminal B determines that the current packet loss rate is 5%.

Then terminal A and terminal B respectively feed back the parameter values of the determined predetermined parameters to the network side through the mobile communication network. Control Protocol) format data packets to the network side, terminal B carries the determined "packet loss rate = 5%" in a data packet conforming to the RTCP format and sends to the network side.

After receiving the parameter values of the predetermined parameters fed back by terminal A and terminal B respectively, the network side selects the parameter value fed back by terminal A from the corresponding relationship between the parameter value range of the predetermined parameters stored in advance and the FEC packet loss recovery level The corresponding FEC packet loss recovery level, and the FEC packet loss recovery level corresponding to the parameter value fed back by terminal B. Usually, when the quality of data transmission on the broadcast network is poor, a higher FEC packet loss recovery level should be used. The network side stores multiple correspondences between packet loss rate ranges and FEC packet loss recovery levels, for example, "packet loss rate = 0.5% to 2%" corresponds to "FEC packet loss recovery level 1", "packet loss rate = 2% to 5%" corresponds to "FEC packet loss recovery level 2", "packet loss rate = 5% to 10%" corresponds to " FEC packet loss recovery level 3", "packet loss rate = 10% ~ 20%" corresponds to "FEC packet loss recovery level 4", etc., the network side receives the "packet loss rate = 0.5%" sent by terminal A From the above correspondence, the selected "packet loss rate = 0.5%" should correspond to "FEC packet loss recovery level 1", and the selection of "packet loss rate = 5%" should correspond to "FEC packet loss recovery level 3" .

When the network side subsequently needs to send the second video data to the mobile terminal A and terminal B, according to the "FEC packet loss recovery level 1" selected above, perform FEC encoding corresponding to "FEC packet loss recovery level 1" on the second video data The processing process is to determine the packet loss recovery data FECdata1 corresponding to the second video data; and according to the selected "FEC packet loss recovery level 3", perform the FEC encoding process corresponding to "FEC packet loss recovery level 3" on the second video data , determine packet loss recovery data FECdata3 corresponding to the second video data.

Then, when the network side sends the second data to terminal A and terminal B in broadcast mode, it sends the determined packet loss recovery data FECdata1 corresponding to the second video data to terminal A through the mobile communication network, and sends the determined packet loss recovery data FECdata1 to terminal B through the mobile communication network. Packet loss recovery data FECdata3 corresponding to the second video data. For example, the network side can send the packet loss recovery data FECdata1 in a data packet conforming to the Real-time Transport Protocol (RTP, Real-time Transport Protocol) format and send it to terminal A, and the packet loss recovery data FECdata3 can be carried in a data packet conforming to the RTP format sent to terminal B. Please refer to the accompanying drawing 5, the header part and the payload part of the packet loss recovery data are both attached to the payload part of the RTP data packet.

For each terminal, video data and corresponding packet loss recovery data are transmitted separately. The packet loss recovery data and video data are transmitted through separate independent RTP streams, and the RTP data packets carried by the packet loss recovery data have their own dedicated sequence number space.

In order to enable the terminal to determine the corresponding relationship between video data and packet loss recovery data when receiving multiple video data and packet loss recovery data in the same time period, the network side should compare the video data and the corresponding packet loss recovery data Carries information that can determine the correlation between the two. Taking time information as an example, the timestamps of the three data packets carrying the second video data sent by the network side to terminal A are timestamp1=00:01:25, timestamp1=00:01:26, and timestamp1=00:01 :27, the network side should add time information of 00:01:25, 00:01:26 or 00:01:27 to the packet loss recovery data FECdata1 sent to terminal A, or the time information sent to terminal A The additional time information in the packet recovery data FECdata1 is the time length range [00:01:25, 00:01:27] determined by the time stamps of the 3 data packets carrying the second video data, and the additional time information is also It can be any moment in the determined time length range [00:01:25, 00:01:27]. It can be seen that the time information carried in the packet loss recovery data and the time information carried in the data packet carrying video data are correlated.

After the terminal receives the video data broadcasted by the network side and the packet loss recovery data delivered through the mobile communication network, it obtains the time stamp of the data packet carrying the video data and the time information in the data packet carrying the packet loss recovery data , so as to determine the packet loss recovery data corresponding to the video data, that is, to synchronize the video data stream and the redundant data stream. Perform data recovery and error correction processing on the video data according to the corresponding packet loss recovery data.

Taking the second video data as an example, terminal A obtains the received timestamps of the three data packets carrying the second video data delivered by the network side: timestamp1=00:01:25, timestamp1=00:01:26, timestamp1=00:01:27 and the time information [00:01:25, 00:01:27] carried in the RTP data packet carrying the packet loss recovery data FECdata1, it can be determined that the packet loss recovery data FECdata1 is the second video Data corresponding to packet loss recovery data. Assuming that terminal A has also received another packet loss recovery data FECdata2, and obtains the time information [00:02:20, 00:02:27] carried in the RTP packet carrying the packet loss recovery data FECdata2, since the data carrying FECdata2 The time information of the packet [00:02:20, 00:02:27] is not within the time length range [00:01:25, 00:01:00:01:25, 00:01: 27], it is not any time in [00:01:25, 00:01:27], so it is determined that the packet loss recovery data FECdata2 is not the packet loss recovery data corresponding to the second video data.

In the embodiment of the present invention, after the terminal receives the first data broadcasted by the network side, it feeds back to the network side its own packet loss rate, bit error rate and other parameter values reflecting the data transmission quality of the broadcast network. A terminal, according to the parameter value reflecting the data transmission quality of the broadcast network fed back by the terminal, determines the FEC packet loss recovery level of the packet loss recovery data that should be delivered at the same time when the second data is subsequently broadcast to the terminal. When the network side subsequently broadcasts the second data to multiple terminals, it sends packet loss recovery data with different error correction levels to different terminals through the mobile communication network. For terminals with better broadcast data transmission quality, error correction data can be issued. Packet loss recovery data with a lower level and less data volume, thereby saving network transmission resources; for terminals with poor data transmission quality on the broadcast network, packet loss recovery data with a higher error correction level and more data volume can be issued. Therefore, the correctness of the second data received by the user is guaranteed. Therefore, the solutions proposed in the embodiments of the present invention can provide different terminals with packet loss recovery data of different error correction levels in a targeted manner.

Correspondingly, the embodiment of the present invention also provides a network side device. As shown in FIG. 6, the device includes a first sending unit 601, a receiving unit 602, a determining unit 603, and a second sending unit 604, specifically as follows:

The first sending unit 601 is configured to broadcast the first data to the terminal;

The receiving unit 602 is configured to receive the current parameter value of the predetermined parameter of the terminal fed back by the terminal after receiving the first data sent by the first sending unit 601, and the predetermined parameter can reflect the data transmission quality of the broadcast network;

The determining unit 603 is configured to determine the packet loss recovery data corresponding to the second data according to the parameter value fed back by the terminal received by the receiving unit 602 when the second data is subsequently broadcast to the terminal;

The second sending unit 604 is configured to send the packet loss recovery data corresponding to the second data determined by the determining unit 603 to the terminal through the mobile communication network.

Correspondingly, referring to FIG. 7 , the embodiment of the present invention also proposes a terminal device, including a determining unit 701, a sending unit 702, a receiving unit 703, and a packet loss recovery processing unit 704, wherein:

The determination unit 701 is configured to determine the parameter value of its current predetermined parameter after receiving the first data sent by the network side in a broadcast manner, and the predetermined parameter can reflect the data transmission quality of the broadcast network;

a sending unit 702, configured to send the parameter value of the predetermined parameter determined by the determining unit 701 to the network side through the mobile communication network;

The receiving unit 703 is configured to receive packet loss recovery data corresponding to the second data sent by the network side through the mobile communication network when receiving the second data subsequently sent by the network side in a broadcast manner, the packet loss recovery data It is determined by the network side according to the parameter value of the predetermined parameter sent by the terminal;

The packet loss recovery processing unit 704 is configured to perform packet loss recovery processing on the received second data according to the packet loss recovery data corresponding to the second data received by the receiving unit 703 .

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A method for broadcasting data transmission, characterized in that, comprising: The network side broadcasts the first data to the terminal; and receiving the current parameter value of the predetermined parameter of the terminal fed back by the terminal after receiving the first data, the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located; When the network side subsequently broadcasts the second data to the terminal, according to the parameter value fed back by the terminal, the packet loss recovery data corresponding to the second data is determined, and sending the determined packet loss recovery data to the terminal; Wherein, the network side determines the packet loss recovery data corresponding to the second data according to the parameter value fed back by the terminal, specifically including: The network side determines the packet loss recovery data corresponding to the second data according to the FEC packet loss recovery level corresponding to the parameter value fed back by the terminal, and the FEC packet loss recovery level corresponding to the parameter value is the parameter value received by the network side from the terminal feedback After that, it is selected from the pre-stored correspondence between the parameter value range of the predetermined parameter and the FEC packet loss recovery level. 2. The method according to claim 1, wherein the network side identifies the correspondence between the second data and the packet loss recovery data in the following manner: The network side carries information for determining a correspondence between the second data and the packet loss recovery data in the second data and the corresponding packet loss recovery data. 3. The method according to claim 2, wherein the information is time information. 4. The method according to claim 3, wherein the time information carried by the network side in the packet loss recovery data is a time range determined according to the time information carried in the data packet carrying the second data, or any time within the time frame. 5. The method according to claim 1, wherein the predetermined parameter is a packet loss rate or a bit error rate. 6 . The method according to claim 1 , wherein the network side sends the packet loss recovery data to the terminal based on a transmission protocol with a time identifier and a sequence identifier. 7 . 7. A method for broadcasting data transmission, characterized in that it comprises: After receiving the first data sent by the network side in broadcast mode, the terminal determines the parameter value of its current predetermined parameter, and the predetermined parameter can reflect the data transmission quality of the broadcast network; and sending the determined parameter value of the predetermined parameter to the network side; When the terminal receives the second data subsequently broadcast by the network side, it receives the packet loss recovery data corresponding to the second data sent by the network side, and the packet loss recovery data is a predetermined parameter sent by the network side according to the terminal. determined by the parameter values of ; and performing error correction processing on the received second data according to the packet loss recovery data; Wherein, when the terminal receives the second data sent by the network side in a broadcast manner, receiving the packet loss recovery data corresponding to the second data sent by the network side specifically includes: The terminal acquires time information of all data packets in the received data packets carrying the second data, and Obtain the time information in the received packet loss recovery data, and When the time information in the obtained packet loss recovery data is within the time range determined according to the time information carried in the data packet carrying the second data, or at any time within the time range, it is determined that the received The packet loss recovery data is the packet loss recovery data corresponding to the second data. 8. The method according to claim 7, wherein the terminal sends the determined parameter value of the predetermined parameter to the network side based on the data packet conforming to the RTP control protocol. 9. A network side device, characterized in that it comprises: a first sending unit, configured to broadcast the first data to the terminal; The receiving unit is configured to receive the current parameter value of the predetermined parameter of the terminal fed back by the terminal after receiving the first data sent by the first sending unit, and the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located ; The determining unit is configured to determine the packet loss recovery data corresponding to the second data according to the parameter value fed back by the terminal received by the receiving unit when the second data is subsequently broadcast to the terminal; The second sending unit is configured to send the packet loss recovery data corresponding to the second data determined by the determining unit to the terminal through a mobile communication network; Wherein, the determining unit is specifically configured to: determine the packet loss recovery data corresponding to the second data according to the FEC packet loss recovery level corresponding to the parameter value fed back by the terminal, and the FEC packet loss recovery level corresponding to the parameter value is received by the network side After receiving the parameter value fed back by the terminal, it is selected from the pre-stored correspondence between the parameter value range of the predetermined parameter and the FEC packet loss recovery level. 10. A terminal device, characterized in that, comprising: The determination unit is configured to determine the parameter value of its current predetermined parameter after receiving the first data sent by the network side in a broadcast manner, and the predetermined parameter can reflect the data transmission quality of the broadcast network where the terminal is located; a sending unit, configured to send the parameter value of the predetermined parameter determined by the determining unit to the network side through the mobile communication network; The receiving unit is configured to receive packet loss recovery data corresponding to the second data sent by the network side through the mobile communication network when receiving the second data subsequently sent by the network side in a broadcast manner, and the packet loss recovery data is It is determined by the network side according to the parameter value of the predetermined parameter sent by the terminal; A packet loss recovery processing unit, configured to perform packet loss recovery processing on the received second data according to the packet loss recovery data corresponding to the second data received by the receiving unit; Wherein, the receiving unit is specifically configured to obtain time information of all data packets in the received data packets carrying the second data, and Obtain the time information in the received packet loss recovery data, and When the time information in the obtained packet loss recovery data is within the time range determined according to the time information carried in the data packet carrying the second data, or at any time within the time range, it is determined that the received The packet loss recovery data is the packet loss recovery data corresponding to the second data.