CN102970524A - Video transmission method, device and system in wireless network - Google Patents
Video transmission method, device and system in wireless network Download PDFInfo
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- CN102970524A CN102970524A CN2011102565629A CN201110256562A CN102970524A CN 102970524 A CN102970524 A CN 102970524A CN 2011102565629 A CN2011102565629 A CN 2011102565629A CN 201110256562 A CN201110256562 A CN 201110256562A CN 102970524 A CN102970524 A CN 102970524A
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Abstract
The invention provides a video transmission method, device and system in a wireless network. The method comprises determining a distortion degree and resource occupancy conditions corresponding to different application layer coding parameters and different physical layer transmission parameters according to different encoding information corresponding to the different application layer coding parameters, the different physical layer transmission parameters, average wireless channel information sent by an access network and error compensation information; enabling a physical layer transmission parameter and an application layer coding parameter which have the distortion degree smaller than a set threshold and occupy minimum resources to be determined as a first physical layer transmission parameter and a first application layer coding parameter; and adopting the first application layer coding parameter to encode video units sent by a video server, and sending the encoded video units to the access network. An embodiment can improve video transmission performance.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to video transmission method, equipment and system in a kind of wireless network.
Background technology
Video has become the business of flow maximum in the network service, when video traffic provides abundant information, has taken a large amount of system bandwidths, has reduced power system capacity.Because Radio Resource is rare, from operator's angle, a good wireless video communication system should be able to reach maximum power system capacity, can also provide simultaneously satisfied user to experience, maximum power system capacity is namely supported maximum numbers of users, the user experiences such as being the receiver, video quality, video continuation degree etc.
Concept hierarchy according to network, typical each layer of video communication system has its corresponding key parameter, for example application layer is discrete cosine transform (Discrete Cosine Transform, DCT) coefficient, comprise DCT quantization parameter (Quantization Parameter, QP) and/or the DCT amount of blocking, physical layer is Modulation and Coding Scheme (Modulation and Coding Scheme, MCS).The value of each layer key parameter has a strong impact on the performance of system.Having now when each layer of design key parameter is layering design, and every layer key parameter is the optimal selection of respective layer.But this hierarchical design scheme is merely able to reach the local optimum selection of each layer parameter value, can not realize on the whole the best video communication efficiency, namely can not only satisfy user's experience but also reach larger power system capacity.
Summary of the invention
The embodiment of the invention provides video transmission method, equipment and system in a kind of wireless network, is implemented on the basis of satisfying user's experience to improve power system capacity.
On the one hand, the embodiment of the invention provides video transmission method in a kind of wireless network, comprising:
The first equipment is determined the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that Access Network sends;
The first equipment with the distortion factor less than the threshold value that arranges and transport parameters for physical layer and application layer coding parameter when taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information;
The video unit coding that the first equipment adopts described the first application layer coding parameter that video server is sent, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
On the other hand, the embodiment of the invention provides video transmission method in a kind of wireless network, comprising:
The second equipment sends average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource;
The second equipment receives the Video stream information of described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer;
The second equipment receives the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
On the one hand, the embodiment of the invention provides video transmission equipment in a kind of wireless network, comprising:
The Resource Block computing module is assessed and taken to the distortion factor, be used for determining the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that Access Network sends;
Best parameter group is selected module, be used for described distortion factor assessment and transport parameters for physical layer and application layer coding parameter when taking the distortion factor that the Resource Block computing module obtains less than the threshold value that arranges and taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information;
Coding module, described the first application layer coding parameter that is used for adopting described best parameter group to select module to obtain is encoded to the video unit that video server sends, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
On the other hand, the embodiment of the invention provides video transmission equipment in a kind of wireless network, comprising:
The channel information collection module, be used for sending average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource;
Selected module, require information for the Video stream information that receives described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer;
Transport module is used for receiving the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
The embodiment of the invention also provides Video transmission system in a kind of wireless network, comprising:
Two kinds of above-mentioned equipment.
As shown from the above technical solution, when determining the parameter of each layer, be to determine in conjunction with the parameter of other layer in the embodiment of the invention, by taking the information of each layer into consideration, can realize comprising the optimal parameter on the whole of each layer, realize total optimization, and then improve power system capacity on the basis of satisfying user's experience.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done a simply introduction during the below will describe embodiment, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of video transmission method one embodiment in the wireless network of the present invention;
Fig. 2 is the schematic flow sheet of the assessment distortion factor in the embodiment of the invention;
Fig. 3 is error concealment schematic diagram in the embodiment of the invention;
Fig. 4 is the schematic flow sheet of another embodiment of video transmission method in the wireless network of the present invention;
Fig. 5 is the schematic flow sheet of another embodiment of video transmission method in the wireless network of the present invention;
Fig. 6 is the structural representation of video transmission equipment one embodiment in the wireless network of the present invention;
Fig. 7 is the structural representation of another embodiment of video transmission equipment in the wireless network of the present invention;
Fig. 8 is the structural representation of Video transmission system one embodiment in the wireless network of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the schematic flow sheet of video transmission method one embodiment in the wireless network of the present invention, comprising:
Step 11: the first equipment is determined the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that Access Network sends.
Wherein, the first equipment can be arranged in video server (video server), perhaps is arranged in core net, perhaps is arranged in the Access Network network element, in the base station.
This application layer coding parameter can be the DCT coefficient, is specifically as follows DCT quantization parameter QP or the DCT amount of blocking, perhaps the combination of the two.
This transport parameters for physical layer can be MCS.
This average radio channel information can be average signal-to-noise ratio (Signal Noise Ratio, SNR).
This coded message can comprise: bit rate, pixel value and offset information.
Further, the coded message that different application layer coding parameters is corresponding can followingly obtain:
Adopt different application layer coding parameters, the video unit that video server sends is encoded, obtain different coded message corresponding to application layer coding parameter.
For example, take the DCT coefficient as example as QP, adopt QP1 that video unit is encoded, in cataloged procedure, will export bit rate corresponding to QP1, pixel value and offset information; Adopt QP2 that video unit is encoded, in cataloged procedure, will export bit rate corresponding to QP2, pixel value and offset information.The like, can travel through and obtain coded message corresponding to all QP.
Need to prove, if the first equipment is arranged in video server, can directly not carry out above-mentioned coding through the video unit of encoding to what video server generated.If the first equipment is arranged in core net or Access Network, the video unit behind the coding that then needs video server is sent is decoded, and more decoded video unit is encoded.
Wherein, a video unit can be a picture group (Group Of Picture, GOP), frame (frame) or sheet (Slice).
The distortion factor (dist) can adopt existing video distortion algorithm for estimating (Recursive optimalper-pixel estimate, ROPE).In this algorithm, take the DCT coefficient as example, the distortion factor are packet loss (Packet Loss Ratio, PLR), QP, QP are corresponding pixel value and offset information as QP, and the function of the error concealment information of video terminal, that is, the distortion factor can be expressed as:
Dist=f (PLR, QP, pixel value and offset information, error concealment information),
Because expression is very complicated, also be prior art, so particular content can be referring to existing document.
Fig. 2 is the schematic flow sheet of the assessment distortion factor in the embodiment of the invention, and referring to Fig. 2, PLR can determine that computing formula can be expressed as according to physical layer Block Error Rate (Physical Block Error Ratio, PER) and the long L of packet bag:
PLR＝1-(1-PER)
L/block_size
Wherein, PER can obtain by tabling look-up, and this form is existing emulation experience form, the corresponding relation of record SNR, MCS and PER, the PER value in the time of can finding average SNR with different MCS according to this form.
L can multiply by bit rate by the duration of video unit and obtain, and block size is the value relevant with communication system and MCS, can determine the block_size value that MCS different in current communication system is corresponding by tabling look-up.
Therefore, during with different MCS, can obtain the corresponding distortion factor at different QP, for example, when QP is q
j, MCS is c
kThe time, then the corresponding distortion factor is:
D
Jk=f (PLR (c
k), q
j, pixel value and offset information, error concealment information).
Above-mentioned error concealment information can be obtained in the following way:
The error concealment information of receiver, video terminal to report; Perhaps,
The corresponding macro block information in position of the macro block of losing with described video unit in the video unit that will be adjacent with described video unit is defined as the error concealment information of the described macro block of losing.
For example, Fig. 3 is error concealment schematic diagram in the embodiment of the invention, and referring to Fig. 3, the macro block (macroblock) in certain sheet of losing in the n two field picture is compensated by the macro block of same position in the n-1 two field picture.
In addition, occupation condition can adopt following computing formula to obtain:
Wherein, N
JkBe the number of the Resource Block that takies of a video unit, l (q
j) be that the QP that adopts is q
jThe bit number of Shi Zhanyong, θ (c
k) be that the MCS that adopts is c
kThe time spectrum efficiency, N
0The bit number that takies for the single resource piece.For example, in the LTE system, suppose that a Resource Block comprises 12 subcarriers and 14 symbols, then N
0=12 * 14.
Step 12: the first equipment with the distortion factor less than the threshold value that arranges and transport parameters for physical layer and application layer coding parameter when taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information.
Wherein, take the DCT coefficient as example as QP, by above-mentioned computing, can obtain q
jAnd c
kCorresponding D
JkAnd N
Jk, afterwards, with D
Jk＜D
MaxAnd N
JkMinimum QP and MCS combination are defined as optimum combination, and the QP of this moment is called the first application layer coding parameter, and MCS is called the first transport parameters for physical layer.
Step 13: the video unit coding that the first equipment adopts described the first application layer coding parameter that video server is sent, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
Wherein, when the first equipment is arranged in video server, the first equipment will adopt the first application layer coding parameter that the video unit that video server generates is encoded; If the first equipment is arranged in core net or Access Network, then the first equipment is at first decoded to the video unit that video server sends, and adopts afterwards the first application layer coding parameter recompile (or being called transcoding) again.
DCT coefficient and MCS when present embodiment satisfies distortion factor requirement and takies least resource by calculating, and carry out final application layer process with this DCT coefficient, and the transmission of video that this MCS is corresponding requires will be for Access Network Computational Physics layer transformation parameter, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Fig. 4 is the schematic flow sheet of another embodiment of video transmission method in the wireless network of the present invention, comprising:
Step 41: the second equipment sends average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource.
Wherein, the second equipment can be arranged in Access Network, and the first equipment can be arranged in video server, core net or Access Network.
This average radio channel information can be average SNR.
The first equipment receive average SNR calculate the first application layer coding parameter and the first transport parameters for physical layer flow process can referring on an embodiment.
This average SNR can be that the second equipment carries out obtaining after the statistical average according to real-time SNR.
The second equipment can the receiver, video terminal to report real-time SNR, also can active probe obtain real-time SNR.
Step 42: the second equipment receives the Video stream information of described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer.
Wherein, this Video stream information can be packet length L.
Video streaming requires information can be PLR.
This real-time radio channel information can be real-time SNR.
Take transport parameters for physical layer as example as MCS, can determine in the following way the second transport parameters for physical layer:
According to described real-time SNR and different MCS, the physical layer Block Error Rate when obtaining different MCS by tabling look-up; Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS;
More than the particular content of two steps can be referring to a upper embodiment, that is, and corresponding c
kCan obtain PLR
k
Afterwards, less than described PLR, and the highest MCS of modulation levels is defined as the second transport parameters for physical layer with the packet loss of correspondence.That is, with PLR
kMCS during PLR that the＜the first equipment sends is as optional MCS, and when a plurality of optional MCS, the MCS that modulation levels is the highest is defined as the second above-mentioned transport parameters for physical layer.Wherein, every kind of MCS has corresponding modulation levels, such as 64 quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) modulation levels is higher than quarternary phase-shift keying (QPSK) (Quadrature Phase Shift Keying, QPSK), the modulation levels of biphase phase shift keying (Binary Phase Shift Keying, BPSK).
Step 43: the second equipment receives the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
For example, the second equipment adopts the second transport parameters for physical layer again it to be carried out physical layer modulation after receiving video unit after the first equipment adopts the first application layer coding parameter coding.
DCT coefficient when present embodiment satisfies distortion factor requirement and takies least resource by adopting in application layer is processed, the transmission of video that MCS when physical layer adopts above-mentioned optimal conditions is corresponding requires to process at corresponding in real time MCS, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Above-mentioned respectively with the one-sided flow process of describing transmission of video, the embodiment of the invention can be carried out Combined Treatment to realize the cross-layer optimum in conjunction with the first equipment and the second equipment.
Fig. 5 is the schematic flow sheet of another embodiment of video transmission method in the wireless network of the present invention, comprising:
Step 51: the second equipment sends average radio channel information to the first equipment;
This radio channel information can be SNR, and the second equipment can carry out obtaining after the statistical average according to real-time SNR.
Step 52: the first equipment is according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that the second equipment sends, determine the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding, and with the distortion factor less than the threshold value that arranges and transport parameters for physical layer and application layer coding parameter when taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter.
Step 53: the first equipment will send to the second equipment according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined.
Step 54: the video unit coding that the first equipment adopts described the first application layer coding parameter that video server is sent, and the video unit after will encoding sends to the second equipment.
Step 55: the second equipment receives the Video stream information of the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer.
Step 56: the second equipment receives the video unit after the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
The particular content of above steps can be referring to Fig. 3 or embodiment shown in Figure 4.
Present embodiment is processed by the DCT coefficient of the first equipment when the application layer employing is satisfied distortion factor requirement and taken least resource, the transmission of video that the MCS of the second equipment when physical layer adopts above-mentioned optimal conditions is corresponding requires to process at corresponding in real time MCS, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Fig. 6 is the structural representation of video transmission equipment one embodiment in the wireless network of the present invention, this equipment can be specially the first above-mentioned equipment, this equipment can be positioned at video server, in core net or the Access Network, this equipment comprises distortion factor assessment and takies Resource Block computing module 61, best parameter group is selected module 62 and coding module 63, the distortion factor is assessed and is taken Resource Block computing module 61 for the coded message corresponding according to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and error concealment information that Access Network sends are determined the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding; Best parameter group selects module 62 to be used for described distortion factor assessment and transport parameters for physical layer and application layer coding parameter when taking the distortion factor that Resource Block computing module 61 obtains less than the threshold value that arranges and taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information; Described the first application layer coding parameter that coding module 63 is used for adopting described best parameter group to select module 62 to obtain is encoded to the video unit that video server sends, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
Among the embodiment, described coding module 63 also is used for: adopt different application layer coding parameters, described video unit is encoded, obtain different coded message corresponding to application layer coding parameter.
Among the embodiment, described average radio channel information is average SNR, described transport parameters for physical layer is MCS, described application layer coding parameter is the DCT coefficient, described DCT coefficient is DCT quantization parameter QP and/or the DCT amount of blocking, described coded message comprises bit rate, pixel value and offset information, and the described distortion factor is assessed and taken Resource Block computing module 61 and specifically is used for: according to described average SNR and MCS, and the physical layer Block Error Rate when obtaining different MCS by tabling look-up; Obtain the packet length of packet according to described bit rate; Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS; Packet loss during according to described different MCS, different DCT coefficients and corresponding pixel value and offset information thereof, and described error concealment information, the distortion factor and occupation condition when obtaining different MCS with different DCT coefficient.
Among the embodiment, the described distortion factor is assessed and is taken the Resource Block computing module and also is used for: the error concealment information of receiver, video terminal to report; Perhaps, the corresponding macro block information in position of the macro block of losing with described video unit in the video unit that will be adjacent with described video unit is defined as the error concealment information of the described macro block of losing.
When this equipment is arranged in Access Network or core net, this equipment can also comprise decoder module, be used for the source video unit that video server sends is decoded, so that described coding module adopts described the first application layer coding parameter that decoded video unit is encoded.
Take the DCT coefficient as example as QP, wherein obtain different MCS with different DCT coefficient the time the computing formula of occupation condition be:
Wherein, N
JkBe the number of the Resource Block that takies of a video unit, l (q
j) be that the QP that adopts is q
jThe bit number of Shi Zhanyong, θ (c
k) be that the MCS that adopts is c
kThe time spectrum efficiency, N
0The bit number that takies for the single resource piece.
DCT coefficient and MCS when present embodiment satisfies distortion factor requirement and takies least resource by calculating, and carry out final application layer process with this DCT coefficient, and the transmission of video that this MCS is corresponding requires will be for Access Network Computational Physics layer transformation parameter, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Fig. 7 is the structural representation of another embodiment of video transmission equipment in the wireless network of the present invention, this equipment can be specially the second above-mentioned equipment, this equipment can be arranged in Access Network, and this equipment comprises channel information collection module 71, selected module 72 and transport module 73; Channel information collection module 71 is used for sending average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource; Selected module 72 is used for receiving the Video stream information of described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer; Transport module 73 is used for receiving the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
Among the embodiment, described real-time radio channel information is real-time SNR, described Video stream information is packet length L, described video streaming requirement information is PLR, transport parameters for physical layer is MCS, described selected module 72 specifically is used for: according to described real-time SNR and different MCS, and the physical layer Block Error Rate when obtaining different MCS by tabling look-up; Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS; Less than described PLR, and the highest MCS of modulation levels is defined as the second transport parameters for physical layer with the packet loss of correspondence.
Among the embodiment, described channel information collection module 71 also is used for: the radio channel information of receiver, video terminal real-time report, perhaps, active probe obtains real-time radio channel information, and described Real-time Channel information is carried out obtaining average radio channel information after the statistical average.
DCT coefficient and MCS when present embodiment satisfies distortion factor requirement and takies least resource by calculating, and carry out final application layer process with this DCT coefficient, and the transmission of video that this MCS is corresponding requires will be for Access Network Computational Physics layer transformation parameter, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Fig. 8 is the structural representation of Video transmission system one embodiment in the wireless network of the present invention, and this system comprises that the first equipment 81 and the second equipment 82, the first equipment 81 can be as shown in Figure 6, and the second equipment 82 can be as shown in Figure 7.In addition, the first equipment 81 can be arranged in video server, core net or Access Network, and the second equipment 82 can be arranged in Access Network.
Present embodiment is processed by the DCT coefficient of the first equipment when the application layer employing is satisfied distortion factor requirement and taken least resource, the transmission of video that the MCS of the second equipment when physical layer adopts above-mentioned optimal conditions is corresponding requires to process at corresponding in real time MCS, can realize the cross-layer optimal case, maximized system capacity on the basis of satisfying user's experience.
Be understandable that mutually reference of the correlated characteristic in said method and the equipment.In addition, " first " in above-described embodiment, " second " etc. are for each embodiment of differentiation, and do not represent the quality of each embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (18)
1. video transmission method in the wireless network is characterized in that, comprising:
The first equipment is determined the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that Access Network sends;
The first equipment with the distortion factor less than the threshold value that arranges and transport parameters for physical layer and application layer coding parameter when taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information;
The video unit coding that the first equipment adopts described the first application layer coding parameter that video server is sent, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
2. method according to claim 1 is characterized in that, also comprises:
The first equipment adopts different application layer coding parameters, and described video unit is encoded, and obtains different coded message corresponding to application layer coding parameter.
3. method according to claim 1, it is characterized in that, described average radio channel information is average signal-to-noise ratio SNR, described transport parameters for physical layer is Modulation and Coding Scheme MCS, described application layer coding parameter is the discrete cosine transform coefficient, described DCT coefficient is DCT quantization parameter QP and/or the DCT amount of blocking, described coded message comprises bit rate, pixel value and offset information, the described coded message corresponding according to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and error concealment information that Access Network sends, determine the described different application layer coding parameter distortion factor and the occupation condition corresponding with different transport parameters for physical layer, comprising:
According to described average SNR and MCS, the physical layer Block Error Rate when obtaining different MCS by tabling look-up;
Obtain the packet length of packet according to described bit rate;
Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS;
Packet loss during according to described different MCS, different DCT coefficients and corresponding pixel value and offset information thereof, and described error concealment information, the distortion factor and occupation condition when obtaining different MCS with different DCT coefficient.
4. method according to claim 1 is characterized in that, also comprises:
The error concealment information of the first equipment receiver, video terminal to report; Perhaps,
The corresponding macro block information in position of the macro block of losing with described video unit in the video unit that the first equipment will be adjacent with described video unit is defined as the error concealment information of the described macro block of losing.
5. method according to claim 1 is characterized in that, before the video unit that described the first application layer coding parameter of described employing sends video server was encoded, described method also comprised:
The first equipment is decoded to the source video unit that video server sends, in order to adopt described the first application layer coding parameter that decoded video unit is encoded.
6. each described method is characterized in that according to claim 1-5, also comprises:
The second equipment sends average radio channel information to described the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource;
The second equipment receives the Video stream information of described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer;
The second equipment receives the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
7. video transmission method in the wireless network is characterized in that, comprising:
The second equipment sends average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource;
The second equipment receives the Video stream information of described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer requires information, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer;
The second equipment receives the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
8. method according to claim 7, it is characterized in that, described real-time radio channel information is real-time signal to noise ratio snr, described Video stream information is packet length L, described video streaming requirement information is packet loss PLR, transport parameters for physical layer is Modulation and Coding Scheme MCS, and described definite the second transport parameters for physical layer comprises:
According to described real-time SNR and different MCS, the physical layer Block Error Rate when obtaining different MCS by tabling look-up;
Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS;
Less than described PLR, and the highest MCS of modulation levels is defined as the second transport parameters for physical layer with the packet loss of correspondence.
9. according to claim 7 or 8 described methods, it is characterized in that, also comprise:
The radio channel information of the second equipment receiver, video terminal real-time report, perhaps, active probe obtains real-time radio channel information, and described Real-time Channel information is carried out obtaining average radio channel information after the statistical average.
10. video transmission equipment in the wireless network is characterized in that, comprising:
The Resource Block computing module is assessed and taken to the distortion factor, be used for determining the distortion factor and occupation condition that different application layer coding parameters and different transport parameters for physical layer are corresponding according to coded message corresponding to different application layer coding parameters, different transport parameters for physical layer, average radio channel information and the error concealment information that Access Network sends;
Best parameter group is selected module, be used for described distortion factor assessment and transport parameters for physical layer and application layer coding parameter when taking the distortion factor that the Resource Block computing module obtains less than the threshold value that arranges and taking least resource, be defined as the first transport parameters for physical layer and the first application layer coding parameter, and will send to Access Network according to Video stream information and video streaming requirement information corresponding to described the first transport parameters for physical layer that described coded message is determined, so that described Access Network is determined the second transport parameters for physical layer according to described Video stream information and video streaming requirement information;
Coding module, described the first application layer coding parameter that is used for adopting described best parameter group to select module to obtain is encoded to the video unit that video server sends, and the video unit after will encoding sends to Access Network, so that described Access Network adopts described the second transport parameters for physical layer that the video unit that receives is carried out sending after the physical layer process.
11. equipment according to claim 10 is characterized in that, described coding module also is used for:
Adopt different application layer coding parameters, described video unit is encoded, obtain different coded message corresponding to application layer coding parameter.
12. according to claim 10 or 11 described equipment, it is characterized in that, described average radio channel information is average signal-to-noise ratio SNR, described transport parameters for physical layer is Modulation and Coding Scheme MCS, described application layer coding parameter is the discrete cosine transform coefficient, described DCT coefficient is DCT quantization parameter QP and/or the DCT amount of blocking, and described coded message comprises bit rate, pixel value and offset information, and the described distortion factor is assessed and taken the Resource Block computing module and specifically is used for:
According to described average SNR and MCS, the physical layer Block Error Rate when obtaining different MCS by tabling look-up;
Obtain the packet length of packet according to described bit rate;
Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS;
Packet loss during according to described different MCS, different DCT coefficients and corresponding pixel value and offset information thereof, and described error concealment information, the distortion factor and occupation condition when obtaining different MCS with different DCT coefficient.
13. according to claim 10 or 11 described equipment, it is characterized in that described distortion factor assessment and take the Resource Block computing module and also be used for:
The error concealment information of receiver, video terminal to report; Perhaps,
The corresponding macro block information in position of the macro block of losing with described video unit in the video unit that will be adjacent with described video unit is defined as the error concealment information of the described macro block of losing.
14. according to claim 10 or 11 described equipment, it is characterized in that, also comprise:
Decoder module is used for the source video unit that video server sends is decoded, so that described coding module adopts described the first application layer coding parameter that decoded video unit is encoded.
15. video transmission equipment in the wireless network is characterized in that, comprising:
The channel information collection module, be used for sending average radio channel information to the first equipment, so that first transport parameters for physical layer and the first application layer coding parameter of described the first equipment when, determining the distortion factor according to described average radio channel information less than the threshold value that arranges and taking least resource;
Selected module, require information for the Video stream information that receives described the first equipment transmission and the video streaming corresponding with described the first transport parameters for physical layer, and according to real-time radio channel information and described Video stream information and video streaming requirement information, determine the second transport parameters for physical layer;
Transport module is used for receiving the video unit after described the first equipment adopts described the first application layer coding parameter coding, and adopts described the second transport parameters for physical layer that described video unit is carried out sending after the physical layer process.
16. equipment according to claim 15, it is characterized in that, described real-time radio channel information is real-time signal to noise ratio snr, described Video stream information is packet length L, described video streaming requirement information is packet loss PLR, transport parameters for physical layer is Modulation and Coding Scheme MCS, and described selected module specifically is used for:
According to described real-time SNR and different MCS, the physical layer Block Error Rate when obtaining different MCS by tabling look-up;
Physical layer Block Error Rate and packet length during according to described different MCS, the packet loss when obtaining different MCS;
Less than described PLR, and the highest MCS of modulation levels is defined as the second transport parameters for physical layer with the packet loss of correspondence.
17. according to claim 15 or 16 described equipment, it is characterized in that described channel information collection module also is used for:
The radio channel information of receiver, video terminal real-time report, perhaps, active probe obtains real-time radio channel information, and described Real-time Channel information is carried out obtaining average radio channel information after the statistical average.
18. Video transmission system in the wireless network is characterized in that, comprising:
Such as each described equipment of claim 10-14; And,
Such as each described equipment of claim 15-17.
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