CN103428531A - Method and system for ARQ controlling of multi-media data - Google Patents
Method and system for ARQ controlling of multi-media data Download PDFInfo
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Abstract
Disclosed in the invention is an automatic repeat request (ARQ) controlling method of multi-media data. The ARQ controlling method comprises the following steps: obtaining a lost multi-media data packet, priority information of the lost multi-media data packet, and a current network condition; and employing a corresponding re-transmission strategy to re-transmit the lost multi-media data packet. In addition, the invention also discloses an ARQ controlling system for the multi-media data. A problem that correct decoding relying on a multi-media data packet with the high priority level can not be carried out due to abandoning of the multi-media data packet with the high priority level when ARQ controlling is carried out can be solved.
Description
Technical field
The present invention relates to the stream media technology field, refer to especially a kind of ARQ control method and system of multi-medium data.
Background technology
Along with the development of the universal and multimedia technology of broadband networks, the application of stream media technology is also more and more extensive, as digital broadcasting service, IPTV business, mobile flow medium service etc.The common feature of these business is all, after multi-medium data is packed by certain rule encapsulation, by the communication network of bottom, to carry out the distribution of data.For example, in the IPTV application, use TS over RTP (Real-time Transport Protocol, RTP) or the mode of TS over UDP (User Datagram Protocol, User Datagram Protocol), by IP network, distributed.The digital broadcasting field, directly utilize TS (Transport Stream, transport stream) as host-host protocol especially, carries out the distribution of data.Due to the transmission unreliability of bottom-layer network, will inevitably there be the situations such as packet generation error code, loss.In prior art, can the feedback request that packet loss retransmits be proposed by receiving terminal, transmitting terminal will be lost or wrong packet resends to receiving terminal, and the mode of ARQ (Automatic Repeat Request, HARQ) solves this problem.But, in the congested continual data package dropout situation caused, too much data packet retransmission may increase transmission delay end to end, thereby affects requirement of real-time, and aggravate congestion, causes more packet loss.
In order to address the above problem, can, when carrying out ARQ control, optionally abandon the multi-medium data bag of some re-transmissions.
Generally, multi-medium data comprises following three class data, i.e. metadata, audio frame number certificate and video requency frame data.Audio frame is all independent decoding, i.e. Existence dependency relationship not between audio frame.For video requency frame data, the video encoder of a standard can produce three kinds of dissimilar frames: independent decoded frame, unidirectional reference frame and two-way reference frame.Independent decoded frame is only used the information of self to carry out independent decoding, and the frame that does not rely on other is decoded, and can be used as the reference frame of other frame decodings.Unidirectional reference frame, when decoding, can, with reference to independent decoded frame or the unidirectional reference frame of front, also can be used as the reference frame of other unidirectional reference frames or the decoding of two-way reference frame; Two-way reference frame, when decoding, can, with reference to the independent decoded frame of front or back both direction, unidirectional reference frame or two-way reference frame, can be used as the reference frame of other two-way reference frame decodings.And the decoding of above-mentioned sound, video may also depend on metadata.For more clearly explanation, as shown in Figure 1, provided the graph of a relation that sound, video data rely on metadata.Because sound, video data decoding rely on metadata, therefore, if abandon metadata, may cause sound, video data all can not carry out normal decoder.Fig. 2 has provided the dependence between three class frames of frame of video, and the order of frame is I
1B
1B
2P
1B
3B
4P
2, I wherein
1(I is independent decoded frame) can independently decode, and do not need the frame with reference to other.And P
1(P is unidirectional reference frame) can go with reference to I
1, P
2Can go with reference to P
1, and B
1, B
2(B is two-way reference frame) can be with reference to I
1And P
1, B
3, B
4Can be with reference to P
1And P
2.In the MPEG-4 standard, the series of frames that comprises an I frame is defined as to an image sets (Group Of Picture, GOP), as IBBPBBP, because other frames in GOP all rely on the I frame to decode directly or indirectly, so abandon an I frame, will cause the frame of whole GOP to be correctly decoded.Similarly, abandoning a P frame makes its frame of P as the reference frame and B frame can't be decoded.
In sum, the continual data package dropout caused in the situation that congested, the ARQ of prior art controls and can produce too much data packet retransmission, thereby meeting aggravate congestion, cause more packet loss, and while optionally abandoning the multi-medium data bag of some re-transmissions, if abandoned the high packet of priority, can cause so relying on the decoding that its packet can not be correct, a lot of invalid packets have been sent thereby cause, waste limited bandwidth, and increased transmission delay end to end, thereby affected requirement of real-time.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of ARQ control method and system of multi-medium data, to solve when carrying out ARQ control, and the problem that its packet of dependence caused due to the much higher media data packet of loss priority can't be correctly decoded.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of ARQ control method of multi-medium data, the method comprises:
Obtain precedence information and the current network conditions of the multi-medium data bag of the multi-medium data bag of loss, described loss, and, according to described precedence information and described current network conditions, adopt the multi-medium data bag of corresponding re-transmission policy retransmission of lost.
Carry described precedence information in described multi-medium data bag.
The multi-medium data bag is divided into: metadata, audio frame and frame of video; Wherein, described frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
The method also comprises: the priority that the multi-medium data bag is set according to the type of multi-medium data bag in advance;
Accordingly, while in described multi-medium data bag, not carrying described precedence information, the precedence information obtained is: according to the priority of the type of the multi-medium data bag of the loss of obtaining and the multi-medium data bag that sets in advance, determine the precedence information of the multi-medium data bag of losing.
The priority that the described type according to the multi-medium data bag arranges the multi-medium data bag is:
The priority of described metadata, audio frame, video independence decoded frame, the unidirectional reference frame of video, the two-way reference frame of video is set for reducing successively.
When described network condition is network packet loss rate, described re-transmission policy comprises:
When the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted;
When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss;
When the current network packet loss is greater than described Second Threshold and is less than or equal to described first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
The present invention also provides a kind of ARQ control system of multi-medium data, and this system comprises acquisition module and ARQ control module, wherein:
Described acquisition module, for precedence information and the current network conditions of the multi-medium data bag that obtains the multi-medium data bag of loss, described loss;
Described ARQ control module, for according to described precedence information and described current network conditions, adopt the multi-medium data bag of corresponding re-transmission policy retransmission of lost.
Described acquisition module, also for extracting described precedence information from described multi-medium data bag.
The multi-medium data bag is divided into: metadata, speech frame and frame of video; Wherein, described frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
This system also comprises: module is set, for the priority of multi-medium data bag is set according to the type of multi-medium data bag in advance;
Accordingly, described acquisition module, also for when from described multi-medium data bag, not extracting described precedence information, according to the priority of the type of the multi-medium data bag of the loss of obtaining and the multi-medium data bag that sets in advance, determine the precedence information of the multi-medium data bag of losing.
The described module that arranges is also reduction successively for the priority that described metadata, speech frame, video independence decoded frame, the unidirectional reference frame of video, the two-way reference frame of video are set.
When described network condition is network packet loss rate, described ARQ control module, also for: when the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted; When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss; When the current network packet loss is greater than described Second Threshold and is less than or equal to described first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
ARQ control method and the system of multi-medium data of the present invention, according to priority and the network packet loss rate of multi-medium data bag, re-transmission policy is set, can optionally abandon the multi-medium data bag that some priority are low while being retransmitted, so can normally carry out ARQ and control the solution network congestion, can also reduce the decoding impact on packet, improve the decoding accuracy simultaneously.
The accompanying drawing explanation
Fig. 1 is the schematic diagram that concerns that sound, video data rely on metadata;
Dependence schematic diagram between the three class frames that Fig. 2 is frame of video;
The ARQ control method schematic diagram that Fig. 3 is multi-medium data of the present invention;
The ARQ control system structural representation that Fig. 4 is multi-medium data of the present invention.
Embodiment
In the ARQ control program of multi-medium data of the present invention, according to current network state, be preferably network packet loss rate, and the low packet of priority selectivity loss priority of multi-medium data bag, the maximum impact reduced decoding.
Be illustrated in figure 3 the ARQ control method schematic diagram of multi-medium data of the present invention, comprise:
In actual applications, may carry the precedence information of self in the multi-medium data bag of loss, as shown in table 1 is the form of a multi-medium data bag, wherein, and the precedence information that is this multi-medium data bag that the loss_priority field is carried.Preferably, the value of loss_priority field that the higher correspondence of priority can be set is less, certainly, also other set-up mode can be arranged, as long as can determine corresponding priority by the value of loss_priority field.
| Name | Size(bits) | Type |
| service_classifier(){ | ||
| service_type | 4 | |
| type_of_bitrate | 3 | |
| throughput | 1 | |
| } | ||
| QoS_classifier(){ | ||
| delay_sensitivity | 3 | |
| reliability_flag | 1 | |
| loss_priority | 2 | |
| Reserved | 2 | |
| } | ||
| flow_identifier(){ | ||
| flow_label | 7 | |
| extension_flag | 1 | |
| } |
Table 1
Also there is in actual applications the situation of in the multi-medium data bag of losing, not carrying the precedence information of self, for this reason, the priority of multi-medium data bag can be set according to the type of multi-medium data bag in advance.
Generally, being divided into of multi-medium data bag: metadata, audio frame and frame of video; Wherein, frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
Above-mentioned multi-medium data bag has following decoding characteristics: sound, frame of video decoding rely on metadata; Video independence decoded frame is only used the information of self to carry out independent decoding, and the frame that does not rely on other is decoded, and can be used as the reference frame of other frame of video decodings; The unidirectional reference frame of video, when decoding, can, with reference to video independence decoded frame or the unidirectional reference frame of video of front, also can be used as the reference frame of the two-way reference frame decoding of the unidirectional reference frame of other videos or video; The two-way reference frame of video, when decoding, can, with reference to video independence decoded frame, the unidirectional reference frame of video or the two-way reference frame of video of front or back both direction, can be used as the reference frame of the two-way reference frame decoding of other videos.
According to the decoding characteristics of above-mentioned multi-medium data bag, the priority of the multi-medium data bag of setting of the present invention is: the priority of metadata, audio frame, video independence decoded frame, the unidirectional reference frame of video, the two-way reference frame of video reduces successively.
, according to the priority of the type of the multi-medium data bag of the loss obtained and the multi-medium data bag that sets in advance, just can determine the precedence information of the multi-medium data bag of loss.
Preferably, current network conditions adopts the current network packet loss, and re-transmission policy comprises following content so:
When the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted;
When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss;
When the current network packet loss is greater than Second Threshold and is less than or equal to first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
Wherein, first threshold and Second Threshold can be arranged according to the actual conditions of network.
For example, first threshold is 30%, and Second Threshold is 5%, and so above-mentioned re-transmission policy is:
If 1 current network packet loss is greater than 30%, the multi-medium data bag of all loss is not retransmitted.
If 2 current network packet loss are less than or equal to 5%, retransmit the multi-medium data bag of all loss.
If 3 current network packet loss are greater than 5% and are less than or equal to 30%, the current network packet loss is larger so, and the priority of the multi-medium data bag of the loss of re-transmission is higher.For example, can arrange as follows according to actual conditions: the current network packet loss is between 5% to 10% the time, retransmission element data, audio frame, video independence decoded frame and the unidirectional decoded frame of video; The current network packet loss is between 10% to 20% the time, retransmission element data, audio frame and video independence decoded frame; The current network packet loss is between 20% to 30% the time, retransmission element data and audio frame.
Known by above-mentioned re-transmission policy, when carrying out ARQ control, the solution of the present invention optionally retransmits the much higher media data packet of priority, has abandoned the low multi-medium data bag of priority, in the impact reduced as much as possible decoding, guaranteed again normally carrying out of ARQ control like this.
Further, in the enforcement of step 301, the detailed process of multi-medium data bag of obtaining loss is as follows:
1, transmitting terminal sends data code flow to receiving terminal.
2, receiving terminal receives data code flow, and detects the multi-medium data bag of losing.
3, receiving terminal sends packet loss feedback information, the information of wherein carrying the multi-medium data bag of loss to transmitting terminal.Preferably, the form of packet loss feedback information is as shown in table 2.
Table 2
Wherein, mask_byte, mask field, the corresponding packet in each bit position of this field, if certain bit position is 1, mean corresponding data-bag lost, if 0, mean not loss of corresponding packet.For example: mask_byte is 01100110.
Stream_Id, the ID of the data code flow at the multi-medium data bag place that indication is lost, for example mask_byte is 01100110 o'clock, has indicated the ID of the described data code flows of these packets.
Packet_id, indicate the ID of the packet of first loss, for example, mask_byte is 01100110 o'clock, the packet that the packet of the 2nd bit position correspondence is first loss, packet_id has indicated the ID of this packet, the ID that according to ID and the mask_byte of this packet, can extrapolate the packet of follow-up loss.
4, transmitting terminal receives the packet loss feedback information, according to the form of above-mentioned packet loss feedback information, can parse the ID of the packet of all loss wherein and the ID of affiliated data code flow, transmitting terminal just can determine which the data of loss are surrounded by, extract the packet of these loss from packet to be sent, retransmitted according to re-transmission policy.
While obtaining the current network packet loss, preferably, can by RTP Control Protocol (RTCP, RTP Control Protocol) bag, to receiving terminal, be obtained by transmitting terminal.Wherein, RTP (Real-time Transport Protocol) is real time transport protocol.
In order to realize said method, the present invention also provides a kind of ARQ control system of multi-medium data, as shown in Figure 4, comprises acquisition module 40 and ARQ control module 41, wherein:
Wherein, acquisition module 40, also for extracting precedence information from the multi-medium data bag.
The multi-medium data bag is divided into: metadata, speech frame and frame of video; Wherein, frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
This system also comprises: module 42 is set, for the priority of multi-medium data bag is set according to the type of multi-medium data bag in advance;
Accordingly, acquisition module 40, also for when from the multi-medium data bag, not extracting precedence information, according to the priority of the type of the multi-medium data bag of the loss of obtaining and the multi-medium data bag that sets in advance, determine the precedence information of the multi-medium data bag of losing.
When network condition is network packet loss rate, ARQ control module 41, also for: when the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted; When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss; When the current network packet loss is greater than Second Threshold and is less than or equal to first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (12)
1. the ARQ control method of a multi-medium data, is characterized in that, the method comprises:
Obtain precedence information and the current network conditions of the multi-medium data bag of the multi-medium data bag of loss, described loss, and, according to described precedence information and described current network conditions, adopt the multi-medium data bag of corresponding re-transmission policy retransmission of lost.
2. the ARQ control method of multi-medium data according to claim 1, is characterized in that, in described multi-medium data bag, carries described precedence information.
3. the ARQ control method of multi-medium data according to claim 1, is characterized in that, the multi-medium data bag is divided into: metadata, audio frame and frame of video; Wherein, described frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
4. according to the ARQ control method of claim 2 or 3 described multi-medium datas, it is characterized in that, the method also comprises: the priority that the multi-medium data bag is set according to the type of multi-medium data bag in advance;
Accordingly, while in described multi-medium data bag, not carrying described precedence information, the precedence information obtained is: according to the priority of the type of the multi-medium data bag of the loss of obtaining and the multi-medium data bag that sets in advance, determine the precedence information of the multi-medium data bag of losing.
5. the ARQ control method of multi-medium data according to claim 4, is characterized in that, the priority that the described type according to the multi-medium data bag arranges the multi-medium data bag is:
The priority of described metadata, audio frame, video independence decoded frame, the unidirectional reference frame of video, the two-way reference frame of video is set for reducing successively.
6. the ARQ control method of multi-medium data according to claim 1, is characterized in that, when described network condition is network packet loss rate, described re-transmission policy comprises:
When the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted;
When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss;
When the current network packet loss is greater than described Second Threshold and is less than or equal to described first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
7. the ARQ control system of a multi-medium data, is characterized in that, this system comprises acquisition module and ARQ control module, wherein:
Described acquisition module, for precedence information and the current network conditions of the multi-medium data bag that obtains the multi-medium data bag of loss, described loss;
Described ARQ control module, for according to described precedence information and described current network conditions, adopt the multi-medium data bag of corresponding re-transmission policy retransmission of lost.
8. the ARQ control system of multi-medium data according to claim 7, is characterized in that,
Described acquisition module, also for extracting described precedence information from described multi-medium data bag.
9. the ARQ control system of multi-medium data according to claim 7, is characterized in that, the multi-medium data bag is divided into: metadata, speech frame and frame of video; Wherein, described frame of video is divided into: video independence decoded frame, the unidirectional reference frame of video and the two-way reference frame of video.
10. the ARQ control system of multi-medium data according to claim 8 or claim 9, is characterized in that, this system also comprises: module is set, for the priority of multi-medium data bag is set according to the type of multi-medium data bag in advance;
Accordingly, described acquisition module, also for when from described multi-medium data bag, not extracting described precedence information, according to the priority of the type of the multi-medium data bag of the loss of obtaining and the multi-medium data bag that sets in advance, determine the precedence information of the multi-medium data bag of losing.
11. the ARQ control system of multi-medium data, is characterized in that according to claim 10,
The described module that arranges is also reduction successively for the priority that described metadata, speech frame, video independence decoded frame, the unidirectional reference frame of video, the two-way reference frame of video are set.
12. the ARQ control system of multi-medium data, is characterized in that according to claim 7,
When described network condition is network packet loss rate, described ARQ control module, also for: when the current network packet loss is greater than default first threshold, the multi-medium data Bao Jun of all loss is not retransmitted; When the current network packet loss is less than or equal to default Second Threshold, retransmit the multi-medium data bag of all loss; When the current network packet loss is greater than described Second Threshold and is less than or equal to described first threshold, the current network packet loss is larger, and the priority of the multi-medium data bag of the loss of re-transmission is higher.
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