KR101233438B1 - Method and Apparatus for Unequal Error Protection in transmitting video over wideband high frequency wireless system - Google Patents

Abstract

We propose a dynamic link adaptation method and apparatus for differential error protection of video signals in wideband high frequency wireless systems. The differential error protection transmission apparatus considering the dynamic link according to an embodiment of the present invention, when receiving video data, checks a bit division position for classifying a bit space size and importance for each pixel component constituting a pixel in consideration of a channel state. A Unequal Error Protection (UEP) transmission controller for controlling to use error correction coding for correcting a large number of errors for information of high importance for each pixel component; A bit divider for classifying pixels of the video according to importance for each pixel component under the control of the UEP transmission controller; And a channel coding unit using corresponding error correction coding according to the importance according to the control of the UEP transmission controller.

Uncompressed video, wideband high frequency wireless systems, differential error protection, channel conditions

Description

Dynamic link adaptation method and apparatus for differential error protection of video signal in wideband high frequency wireless system {{Method and Apparatus for Unequal Error Protection in transmitting video over wideband high frequency wireless system}

The present invention relates to the transmission and reception of video signals in a system capable of high-speed transmission through the use of ultra-wide frequency bands in a wireless communication system. The present invention relates to an apparatus for differentially protecting an error according to the importance of a video signal for transmission and reception.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2007-S-002-02, Title: Multi-Gigabit wireless interface technology development] ].

The moving picture information is different in importance from moving picture information bits, unlike general data information having the same importance of all information bits. For example, upper bits of pixel bytes representing an image are more important than lower bits thereof, and luminance information bits of an image are more important than chroma information bits. The green component is also more important in an RGB color system consisting of red, green and blue components.

In general, moving picture information is much larger than general data information, and real-time performance is required for information transmission, and therefore it should be transmitted at high speed. On the other hand, a wireless channel causes a channel error due to various factors, which causes deformation of the transmitted information. In order to minimize the information distortion due to the radio channel error, additional information (hereinafter, referred to as a channel error correction code) may be added to the information to be transmitted from the transmitter, and the receiver may recover the modified information using the same. However, the channel error correction code information has a disadvantage of reducing the transmission speed of the channel.

In consideration of the importance of the video information and the characteristics of the radio channel, in the high-speed transmission wireless system using the ultra-wideband high-frequency band, which is recently developed, the upper and lower bits of the pixel information bytes constituting the image information are distinguished. In addition, by adding more channel error correction code information to the upper bits and less channel error correction code information to the lower bits, a method of more strongly preventing the deformation of important information and improving the image quality is introduced. have. As described above, the application of the differentiated error correction technique according to the importance of the signal is referred to as Unequal Error Protection (UEP) technique.

However, in the conventional differential error protection scheme, the presence or absence of a significant bit is classified based on a fixed bit position.

An embodiment of the present invention provides a dynamic link adaptation method and apparatus for differential error protection of a video signal in a wideband high frequency wireless system.

An embodiment of the present invention provides an apparatus for differential error protection according to the importance of the video signal for transmission and reception of various video signals that are robust to wireless channel errors while maintaining a high transmission / reception speed as high as possible in a broadband high frequency wireless system. .

In a differential error protection method considering a dynamic link in a transmitting device according to an embodiment of the present invention, checking whether the receiving device supports differential error protection and whether dynamic bit splitting is supported in a beacon message received from the receiving device. If it is determined that the differential error protection and the dynamic bit division are supported, the bit space size of each pixel component constituting the pixel determined in consideration of the channel state, based on the video information of the input video data, and Identifying a bit division position, which is a reference for distinguishing importance levels from each pixel component, classifying the importance level based on the identified bit division positions for each pixel component, and a relatively large number of errors in information having high importance for each pixel component Error correction encoding to correct A step, wherein the space bit size and the bit-sliced position is dynamically can be varied depending on the transmitting device and the channel state between the receiving apparatus.

According to an embodiment of the present invention, a differential error protection method considering a dynamic link in a receiving device includes transmitting a beacon message including whether differential error protection is supported and whether dynamic bit splitting is supported, and a channel state between the transmitting device and the receiving device is changed. Transmitting the channel state change information according to the channel state, and when receiving Unequal Error Protection (UEP) video data from the transmitting device, each bit of each pixel component constituting the pixel of the video data Identifying a bit division position which is a criterion for distinguishing importance in a spatial size and each pixel component, and performing corresponding demodulation according to importance information of the differential error protection video data included in a header of the differential error protection video data; Demodulating according to the importance information Performing error correction on the basis of error correction coding classified according to importance, and combining the error corrected data for each pixel component in consideration of the confirmed bit space size and the identified bit division position. The space size and the bit division position are dynamically changed according to the channel state between the transmitting device and the receiving device, and the header of the differential error protection video data is the bit space size and the bit division location according to the change of the channel state. It may include change count information indicating whether or not to change.

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The differential error protection transmission apparatus considering the dynamic link according to an embodiment of the present invention checks whether the reception apparatus supports differential error protection and dynamic bit splitting in a beacon message received from the reception apparatus, and at the reception apparatus, If it is determined to support differential error protection and support the dynamic bit division, the bit space size of each pixel component constituting the pixel and the pixel, which are determined in consideration of the channel state, based on the video information of the input video data. Unequal Error Protection (UEP) that checks the bit division position, which is a criterion for distinguishing importance in each component, and controls to use error correction coding that corrects a large number of errors for information of high importance for each pixel component (UEP) A transmission controller; A bit division unit that classifies importance based on the identified bit division position for each pixel component under the control of the differential error protection transmission controller; And a channel coding unit using corresponding error correction coding based on the discriminated importance for each pixel component under the control of the differential error protection transmission controller, wherein the bit space size and the bit division position correspond to a transmission device. It may be dynamically changed according to the channel state between the receiving devices.

An embodiment of the present invention relates to a dynamic link adaptation apparatus of a wideband high frequency wireless system that provides differential error protection of a video signal by considering channel state changes and importance of each pixel component of a video signal. More robust protection and adaptive adaptation to changing channel conditions. As a result, it is possible to prevent serious deterioration in image quality due to a transmission channel error. On the other hand, by focusing error control on more important signal components, the overall improvement in transmission speed can also be sought.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements. Further, if it is determined that the gist of the present invention may be unnecessarily blurred, detailed description thereof will be omitted.

An embodiment of the present invention relates to a dynamic link adaptation method and apparatus for differential error protection of a video signal in a wideband high frequency wireless system. Hereinafter, a configuration of a differential error protection transmission apparatus will be described with reference to FIG. 1.

Prior to the description of the present invention, the most significant bit (MSB) generally means the bit that has the greatest influence in bit-wise operations, and the least significant bit (LSB) has the least impact in bit-wise operations. Means a bit to exert. However, in the exemplary embodiment of the present invention, when a pixel of an image is further enlarged and divided into bits of high importance and bits of low importance, bits of upper bits of high importance are represented by MSB and bits of lower importance are represented by LSB.

1 is a diagram illustrating a configuration of a differential error protection transmission apparatus considering a dynamic link according to an embodiment of the present invention. When the UEP transmission apparatus 100 receives the video data, the UEP transmission apparatus 100 checks the bit division position for dividing the bit space size and importance for each pixel component constituting the pixel in consideration of the channel state, and the importance level for each pixel component. Unequal Error Protection (UEP) transmission controller (Tx Controller) 110, which controls to use error correction coding to correct a large number of errors relative to high information, the pixels of the video under the control of the UEP transmission controller. A bit separation unit (160) for dividing the signal into each pixel component according to importance and a channel coding unit using corresponding error correction coding according to the importance of each pixel component under the control of the UEP transmission controller ( Channel Coding Unit) 183. The video data interface 101 receives various video signals such as R / G / B or Y / Cb / Cr, and a multiplexing and buffer unit for multiplexing and storing the configured frames. 181, a header generation unit 182 for sequencing and prioritizing and recording demodulation and channel decoding information, and a symbol mapping and modulation unit for symbol mapping and modulation according to priority and Modulation Unit) 184.

First, the video data input interface 101 is an apparatus for receiving various types of uncompressed video signals. In the present invention, only R / G / B and Y / Cb / Cr types are considered, but other uncompressed video signals are also input. I can receive it.

R / G / B color image is composed of pixels consisting of red (R), green (G) and blue (B) components, and Y / Cb / Cr color image is luminance (Y) component and two-gang color It consists of pixels consisting of difference components Cb and Cr.

These pixel components may be represented in various bit-space-sizes, such as 8 bits, 16 bits, and the like. The video data input interface 101 notifies the UEP transmission controller 110 of the received uncompressed video information 102 and also transfers the received uncompressed video information to the bit divider 160 for each pixel information. Do this.

The UEP transmission controller 110 includes, from the video data input interface 101, video information 102 including a shape of a pixel constituting a video, a bit space size of a pixel, and a divided bit position for distinguishing importance of pixels. Get input. In addition, the UEP scheme negotiation request message 120a is transmitted to a UEP reception controller to be described later in order to transmit the corresponding video in the UEP scheme, and a response message 120b of the UEP scheme negotiation request message is received.

In addition, the UEP transmission controller 110 controls a series of procedures related to video transmission using the UEP information 111 and 112 negotiated through the exchange of the messages 120a and 120b. Subsequently, when the UEP transmission controller 110 receives the channel state change information from the UEP transport controller 210 of the receiving apparatus 200, the bit division position or pixel component bit-space-size value of the pixel component information is adapted to the channel state. To change. Thereafter, the UEP transmission controller 110 may renegotiate the changed information with the UEP reception controller 210 using the UEP method negotiation request message and the UEP method negotiation response message.

The bit dividing unit 160 receives the moving image data in the form of a bit by pixel information (R / G / B or Y / Cb / Cr) from the moving image data input interface 101.

The bit dividing unit 160 receives the bit-space-size for each pixel information and the bit dividing position information for the UEP from the UEP transmission controller 110 and divides the bits. In other words, the bit dividing unit 160 performs a function of constructing a frame having a high importance and a frame having a low importance in the manner in which moving image data bits input for each pixel information will be described later with reference to FIG. 4.

The multiplexing and buffer unit 181 performs a function of sequentially multiplexing and storing a frame having a high importance and a frame having a low importance output from the bit dividing unit 160 for each pixel information and outputting one by one.

The header generation unit 182 gives a frame number output from the multiplexing and buffering device 181 and a sequence number and its priority (which is described in consideration of two-level priority in the present invention, but can be expanded in multiple steps). The header generation unit 182 receives a demodulation information and channel decoding information included in the MCS information 112 necessary for the reception processing of the transmission frame from the UEP transmission controller 110 and adds a header. do.

The channel coding unit 183 discriminates according to the priority of the frame data input from the header generation unit 182 using the channel coding information included in the MCS information 112 provided by the UEP transmission controller 110. Channel error correction information is inserted. That is, in the case of a frame having a high priority, more channel error correction information is inserted. In the case of a frame having a lower priority, less channel error correction information is inserted or no channel error correction information is inserted.

The symbol mapping and modulation unit 184 maps the bits of the frame output from the channel coding unit 183 to the symbols and modulates them according to the channel state and frame priority modulation scheme provided by the UEP transmission controller 110. To the receiver.

2 is a diagram illustrating a configuration of a differential error protection receiving apparatus considering a dynamic link according to an embodiment of the present invention. The UEP reception apparatus 200 is composed of the same units as the UEP transmission apparatus 100 described above, and the operation procedure proceeds in the reverse order.

The UEP receiving apparatus 200 transmits channel state change information according to a channel state, and identifies unequal error protection (UEP) for identifying a bit division position that distinguishes a bit space size and importance for each pixel component constituting a pixel. Receiving controller (Rx Controller) 210, demodulation for performing a corresponding demodulation according to the importance information of the UEP video data included in the header of the UEP video data when receiving Unequal Error Protection (UEP) video data A unit 220, a channel decoding unit 230 for error correcting the demodulated data according to the importance according to the importance, and the UEP receiving the error corrected data according to the importance; Bits that are combined for each pixel component in consideration of the bit space size and the bit division position under the control of a controller Sum and a unit (Bit Combiner Unit) (260). And a demodulation and symbol de-mapping unit 220 for demodulating the received RF signal and extracting bit information from the demodulated symbol, interpreting the information of the received header and receiving the received information. A header parsing unit 240 for transmitting demodulation and channel decoding information of video data and priority and sequencing information, and stores received video frames and bits related frame information according to the sequencing information and priority information. A buffer and demultiplexing unit 250 and a video data output interface 270 are input to the combining unit 260.

First, the UEP reception controller 210 receives a UEP scheme negotiation request message 120a from the UEP transmission controller 110 and transmits a UEP response message 120b thereto. The UEP information 211 negotiated through the exchange of the messages 120a and 120b is used to control a series of procedures related to video reception.

Thereafter, when the channel state is changed, the UEP reception controller 210 generates the channel state change information and transmits the generated channel state change information to the UEP transmission controller 110 of the transmission device 100. The UEP transmission controller 110 is provided with the bit division position or the changed pixel component bit-space-size value of the changed pixel component information suitable for the channel state by using the UEP scheme negotiation request message and the UEP scheme negotiation response message. It may renegotiate with the controller 110.

The demodulation and symbol inverse transform unit 220, the channel decoding unit 230, and the header processing unit 240 first receive the header information and sequentially process the header information according to a predefined transmission / reception method of the header information. The header processing unit which interprets the header information again transmits demodulation and channel decoding information of the video data signal to be received to the demodulation and symbol inverse transform unit 220 and the channel decoding unit 230. At this time, the type of information transmitted is MCS (modulation and coding scheme) index information to be described later.

The demodulation and symbol inverse transform unit 220 and the channel decoding unit 230 correctly process the received video data signal using the demodulation and channel decoding information transmitted from the header processing unit 240, and convert the received video data signal into a buffer and demultiplexing unit ( 250). At this time, the header processing unit 240 transfers the sequencing and priority information obtained from the header information to the buffer and demultiplexing unit 250.

The buffer and demultiplexing unit 250 may easily extract related high priority frames and low priority frames through sequencing and priority information input together with the video frame data, and combine the frames with the bit combining unit 260. Will be entered.

The bit combiner unit 260 includes a plurality of bit combiners 260a, 260b, 260c. The bit combining unit 260 receives high priority frames and low priority frames related to each pixel information from the buffer and demultiplexing unit 250. In addition, the bit combining unit 260 receives bit-space-size and divided bit position information for each pixel information from the UEP reception controller 210 and reconstructs original pixel information. The reconstructed pixel information is transferred to the video data output interface 270.

3 is a diagram illustrating a structure of a UEP negotiation message between a UEP transmitting apparatus and a UEP receiving apparatus according to an embodiment of the present invention. 3 adds information necessary for the present invention to a conventional UEP negotiation message.

UEP negotiation request message 120a transmitted from the UEP transmission controller 110 to the UEP reception controller 210 and UEP negotiation response message transmitted from the UEP reception controller 210 to the UEP transmission controller 110 ( 120b) has the same structure as shown in FIG.

First, the command type field 121 is a field indicating that the UEP negotiation request or response message. The length field 122 is a field indicating the length of a UEP negotiation request or response message. The UEP Type field (UEP Type) 123 is a field indicating the UEP type distinguished in the prior art, and the present invention is fully compatible with the prior art, so the UEP type field is not limited to a special value for the present invention.

The MCS field lists 124a through 124n are fields indicating the MCS schemes that each of the UEP transmission controller 110 and the UEP reception controller 210 support for the UEP stream, and 6 bits (the remaining 2 bits are not used). Indicated by the index value, it is assumed that specific MCS-related parameters corresponding to the index value are shared with each other.

In the present invention, in order to support various bit-space-sizes indicating pixel information and to support independent importance control for each pixel information, the following field information is added to the UEP negotiation message structure. First, a color-type field (Color format) 130 describing a color video display method, which is displayed in a size of 1 byte and displays various color types such as RGB and YCbCr. In other words, the color-type field 130 is pixel component information indicating components of the pixel. The following is a pixel bit-space-size field (Color depth) 140, which typically represents the bit-space-size values of the three components, assuming that the pixel consists of three components.

Although in FIG. 3, as an example of the display method, one bit size is allocated to the bit-space-size field and the bit-space-size value of three pixel components determined according to the value is indicated, In this case, various methods such as allocating one byte to indicate the bit-space-size may exist, and the present invention does not define only one example of FIG. 3.

Finally, the field added to the UEP negotiation message structure includes bits of high importance and low importance of pixel component information consisting of bit-space-size defined for each pixel component by the bit-space-size field 140. A bit separation point 150 that separates the bits with

As an example of the display method of the bit-division-position field 150, as shown in FIG. In the bit-space-size field 140, when the bit space size values between pixel components are X, Y, and Z, respectively, the first byte (b0 to b7) represents a pixel component having an X size bit space in its importance. Therefore, it displays the reference bit position value used when dividing into two steps.

The second byte b8 to b15 represents a reference bit position value used when dividing a pixel component having a Y size bit space into two levels according to its importance, and the third byte b16 to b23 represents a Z size Represents a reference bit position value used when dividing a pixel component having a bit space of? In two steps according to its importance.

Therefore, if the byte value is 0, all bits of the pixel component are included in a higher priority frame (indicated by the most significant bit frame in FIG. 3), and the value is the bit space size value of the pixel component. (Ie, X, Y, or Z), it means that all bits are included in a lower priority frame (represented as a LSB (least significant bit) frame in FIG. 3).

Also, if the byte value is greater than 0 and represents any n value smaller than the bit space size value of the corresponding pixel component (that is, X, Y, or Z), the 0th to n-1th bits in the bits representing the corresponding pixel component Up to n bits are included in the LSB frame, and from n to (bit space size value-1), the nth bit is included in the MSB frame.

As an example of the advantages obtained by individually controlling the importance of each pixel component, in the color system represented by YCbCr having an 8: 8: 8 bit-space-size value, the divided bit positions are respectively 0, By specifying 8 and 8, all bits representing Y can be designated as MSB frames, and all bits representing CbCr can be designated as LSB frames, which allows Y component signals that are more sensitive to human vision to be less sensitive to human vision. Signal processing is more robust to channel errors than CbCr signals.

4 is a diagram illustrating a process of differential error protection considering a dynamic link according to an embodiment of the present invention. Bit space information Dx and Dy for each video pixel component negotiated between the UEP transmission controller 110 and the UEP reception controller 210 through the UEP negotiation messages 120a and 120b as described with reference to FIG. 3. , Dz) and the divided bit position information Px, Py, and Pz are transmitted to the bit dividers 160a, 160b, and 160c for each pixel component of the bit divider 160 in the case of a transmission device (111). In the case of the device, the bit combiners 260a, 260b, and 260c for each pixel component of the bit combiner unit 260 are respectively transmitted (211).

An R or Y pixel component in which a bit space size value of a pixel is Dx and a split bit position value is Px will be described as an example. The bit divider 160a of the UEP transmission apparatus 100 receives an R or Y pixel component in the form of a series of bits from the video data input interface 101 and divides the R or Y pixel components in units of Dx bits. Thereafter, the bit divider 160a of the UEP transmission apparatus 100 is the LSB frame 162, which is a low priority frame, from 0 to (Px-1) of the divided Dx bits, from Px to (Dx-1). Up to bits are composed of the MSB frame 161, which is a high priority frame.

When composed of a frame having a predetermined size, the MSB frame 161 and the LSB frame 162 are processed according to the procedure described in FIG. 3 and transmitted to the receiving device. The UEP reception controller 210 receives and reconstructs the MSB frame 261 and the LSB frame 262 of the R or Y pixel component according to the procedure described in FIG. 4. The UEP reception controller 210 divides bit information constituting the MSB frame 261 in units of bits (Dx-Px) and inputs the bit information into the bit combiner 260a. The UEP reception controller 210 simultaneously divides bit information constituting the LSB frame 262 into Px units and inputs the bit information to the bit combiner 260a. As described above, the bit combiner 260a combines the bits input in parallel in units of Dx bits to reconstruct the R or Y pixel component and transfer the same to the moving image data output interface 270.

FIG. 5 is a diagram illustrating a process of adaptively changing a split bit position value for determining importance of pixel component information according to a variable wireless channel state that is a dynamic link according to an embodiment of the present invention.

First, the UEP transmitting apparatus 100 and the UEP receiving apparatus 200 transmit the pixel information (color type 130) of the video through the UEP method negotiation request message 120a and the UEP method negotiation response message 120b to transmit the video through the UEP. ), Pixel component bit-space-size 140, bit division position 150), and modulation / demodulation and coding information 124a to 124n. Thereafter, the UEP transmission apparatus 100 transmits the video data 190a through the negotiated parameter values. The UEP receiving apparatus 200 may acquire the state information of the wireless channel while processing the video data 190b received in step 300. The UEP reception controller 210 of the UEP reception apparatus 200 notifies the UEP transmission controller 110 of the UEP transmission apparatus 100 of the state information of the radio channel through various methods. The UEP reception controller 210 may periodically transmit a response message of the video data through the channel state change information 310. In addition, the UEP reception controller 210 may notify the UEP transmission controller 110 of the channel state change information 310 when the radio channel status exceeds a specific threshold. 5 shows the latter method. When the UEP transmission controller 110 receives the channel state change information 310 from the UEP reception controller 210, the bit division position 150 or the pixel component bit-space-size of the pixel component information is adapted to the channel state. (140) Change the value. Thereafter, the UEP transmission controller 110 may renegotiate with the UEP reception controller 210 using the changed UEP method negotiation request message 120c and the changed UEP method negotiation response message 120d. When the renegotiation is completed, the UEP transmission controller 110 transmits the video data through the changed parameter.

In this case, the UEP transmitting apparatus 100 may continue to transmit the video data through the existing negotiated parameters until the renegotiation is completed, and as shown in FIG. 7 for easy parameter change recognition in the UEP receiving apparatus 200. Propose a data structure.

6 is a diagram illustrating a structure of video data with differential error protection in consideration of a dynamic link according to an embodiment of the present invention. FIG. 6 illustrates the structure of UEP video data 190a and 190b transmitted by the UEP transmitting device 100 to the UEP receiving device 200.

In general, UEP information is delivered in the form of a frame header. The UEP information includes a priority field 710 indicating the importance of video data to be transmitted, a sequence number field 720 indicating a transmission order, and an MCS index field 124 indicating a modulation and channel encoding scheme of video data. Included. In particular, in the present invention, there is a method of transmitting the bit-space-size 140 and the divided bit position 150 information of the pixel through the UEP negotiation message as described with reference to FIGS. In addition, as shown in FIG. 7 below, the corresponding information is transmitted together with the video data, and the UEP receiving apparatus 200 also proposes a method of recovering the original pixel information through the frame header information as another implementation example of the present invention. In addition, a bit separation point and / or color depth change count (SCC) field 320 is added to indicate a dynamic change in the bit-space-size 140 and the divided bit position 150 information of the pixel. Suggest to do. The UEP transmission controller 110 of the UEP transmission apparatus 100 starts the SCC field value from 0, and increases the SCC field value by 1 when the pixel information change as described above occurs. The UEP receiving controller 210 of the UEP receiving apparatus 200 recognizes that the pixel information is changed by changing the SCC field value, and restores the original pixel information using the changed parameter values.

7 is a diagram illustrating a structure of video data with differential error protection in consideration of a dynamic link in a 60 GHz wireless network system according to an embodiment of the present invention.

The 60 GHz wireless network system aims to provide several gigabits per second using the 60 GHz frequency band. As shown in FIG. 7, the fragmentation-control field 900 of the MAC header overlaps with the field defined in the MAC sub-header, and thus the fragmentation-control field of the MAC header. 900 is not used. In the embodiment of the present invention, the fragmentation-control field 900 of the MAC header, which is not used, is used for the purpose of controlling video data information.

As shown in FIG. 7, the fragmentation-control field 900 of the MAC header is divided into a video-control-type field 910 and a video-control-information field 920. In the present invention, when the value of the video-control-type field 910 is 0b0000 (911), the video-control-information field 920 is used as the bit-division-position information 921, and the bit- The division-position information 921 allows the bit-division-position field 150 described in FIG. 3 to be used by adjusting the number of display bits per pixel. Also, in the embodiment of the present invention, when the value of the video-control-type field 910 is 0b0001 912, the video-control-information field 920 is converted into pixel-bit-space-size information 922. In addition, the pixel-bit-space-size information 922 enables the use of the bit-space-size field 140 described in FIG. In particular, the video-control-type field value 912 and the pixel-bit-space-size information 922 are dynamic when the channel state is so bad that the rate that the system can provide cannot support video data generation rates. It also plays a role of reducing the bit-space-size value and notifying the receiving device of this. In addition, control information required for video data transmission may be defined and used as specific values 913 and 923 of the video-control-type field 910 and the video-control-information field 920.

8 and 9 are flowcharts illustrating a dynamic link through a MAC header to which the present invention is applied in a 60 GHz wireless network system. 8 and 9 illustrate a procedure diagram of dynamically adapting to a wireless channel link using a MAC header defined in FIG. 7 in a transmission apparatus of a 60 GHz wireless network system according to an embodiment of the present invention. An embodiment of a method of using the video-control-type field 910 and the video-control-information field 920 proposed as shown in FIG. 7 will be described.

8 is a flowchart illustrating a process in a case where differential error protection is not possible in a transmission apparatus for differential error protection in consideration of a dynamic link according to an embodiment of the present invention.

Referring to FIG. 8, in operation 1001, a transmission device may be configured to provide differential-error-protection for video data transmission / reception processing of each device through a beacon message with a reception device prior to video data transmission. Check the specification information.

In operation 1002, the transmitting apparatus checks whether the differential-error-protection (UEP) is possible by dynamic bit-division. 8 illustrates the case where differential-error-protection (UEP) is not possible. A case where differential-error-protection (UEP) is possible will be described later with reference to FIG. 9. In addition, the process of checking whether the differential-error-protection by dynamic bit-split through the beacon message will be described later with reference to FIG. 10.

If it is determined in step 1002 that the receiving device is not capable of differential-error-protection (UEP), the transmitting device proceeds to step 1003 and the video-control-type field 910 and the video-control-information field defined in FIG. In order to periodically transmit the MAC header with the individual values of 920, periodic event setup initialization is performed. In this case, the periodic event setting initialization may generate an event when the time timer expires using a time timer, generate an event after transmitting a certain number of MAC PDUs, or generate an event in various ways. have.

In operation 1004, the transmitting apparatus sets a bit-space-size value of each pixel of the video data as MAC header video control information, and transmits the generated MAC PDU in operation 1005. When the first MAC PDU is transmitted, the transmitting device sets the MAC header bit-division-position value of the data (eg, R: G: B) in step 1006 to a default value of 4: 4: 4. The video control information is set, and the process proceeds to step 1007 to transmit the generated MAC PDU.

In operation 1008, the transmitting device receives channel state change information from the receiving device to check whether the channel state changes. If the channel state is changed and the MCS needs to be changed in step 1008, the transmitter proceeds to step 1009, changes to the MCS suitable for the channel state, returns to step 1007, displays this on the MAC sub-header, and then transmits the MAC PDU. do. However, if the channel state is not changed as a result of the check in step 1008, the transmission device proceeds to step 1010 and checks whether the periodic event set in step 1003 has occurred. If it is confirmed that the periodic event has not occurred yet, the process returns to step 1007 and continuously transmits the generated MAC PDU. The video-control-type field 910 and the video-control-information field 920 in the MAC header at this time use the previous MAC PDU header values or use meaningless values 913 and 923. When the periodic event occurs in step 1010, the transmitting device returns to step 1003 and repeats the series of steps up to step 1007, so that the video-control-type field 910 and the video-control-information field (in the MAC header) are performed. 920, the values are periodically signaled.

9 is a flowchart illustrating a process in a case where differential error protection is possible in a transmission apparatus for differential error protection in consideration of a dynamic link according to an embodiment of the present invention.

In step 1002 of FIG. 8, if the differential-error-protection is enabled by dynamic bit-division, the transmission apparatus proceeds to step 1011 and the video-control-type field 910 and the video-control- defined in FIG. 7 are performed. In order to periodically transmit the MAC header having the individual values of the information field 920, periodic event setting initialization is performed. The periodic event setting initialization may generate an event when the time timer expires using a time timer, generate an event after transmitting a certain number of MAC PDUs, or generate an event in various ways. .

In operation 1012, the transmitting apparatus sets the bit-space-size value of each pixel of the video data as MAC header video control information, and transmits the generated MAC PDU in operation 1013. When the first MAC PDU is transmitted, the transmitting apparatus sets the MAC-bit (for example, R: G: B) bit-division-position value of the data to a default value of 4: 4: 4 in step 1014. The video control information is set, and the process proceeds to step 1015 to transmit the generated MAC PDU.

In operation 1016, the transmitting device receives channel state change information from the receiving device and checks whether the channel state has changed. If the channel state does not change as a result of checking in step 1016, the transmission device proceeds to step 1017 and checks whether the periodic event set in step 1011 occurs. If the periodic event has not yet occurred as a result of the check, the process returns to step 1015 to continue transmitting the generated MAC PDU. The video-control-type field 910 and the video-control-information field 920 in the MAC header at this time use the previous MAC PDU header values or use meaningless values 913 and 923. If a periodic event occurs as a result of checking in step 1017, the transmitting apparatus returns to step 1011 and performs a series of processes up to step 1015 again, thereby performing the video-control-type field 910 and the video-control-information field 920 in the MAC header. ) Signals periodically. If a new defined video-control-type field 910 value and a video-control-information field 920 value are used as necessary, a corresponding periodic event is generated by setting a corresponding periodic event. The video-control-type field 910 value and the video-control-information field 920 value may be periodically signaled.

If the channel state is changed as a result of checking in step 1016, the transmission device proceeds to step 1018 to check whether the video data generation rate can be supported through the MCS suitable for the channel state.

If it is confirmed in step 1018 that the channel state is bad and the transmission rate of the system cannot support the video data generation rate, the transmission apparatus proceeds to step 1019 and the pixel bit corresponding to the bit-space-size for each pixel introduced from the upper layer of the MAC proceeds. The amount of data to be transmitted can be reduced by configuring the payload of the MAC PDU by deleting information of lower priority bits in the MAC layer. In order to notify the receiving device of this, the value of the video-control-type field 910 is set to 0b0001 912 and the pixel-bit-space-size information reduced to the value of the video-control-information field 920 ( 922).

In operation 1020, the transmitting device transmits the first MAC PDU encapsulated in a MAC header including the reduced pixel-bit-space-size information. Subsequently, the transmission apparatus proceeds to step 1021 in which the bit-division-position value suitable for the channel state is set as the value of the video-control-type field 910 and the video-control-information field 920. Construct a header. If necessary, the transmitter proceeds to step 1022 to change the MCS, and proceeds to step 1015 to configure and transmit the MAC PDU.

If the channel state improves as a result of checking in step 1018, and the reduced bit-space-size can be recovered, the transmitting device proceeds to step 1024 to restore values below the lower predetermined bit that were deleted from the MAC layer to payload of the MAC PDU. By restoring the amount of data to be transmitted is restored. To inform the receiving device of this, the value of the video-control-type field 910 is set to 0b0001 912 and the pixel-bit-space-size originally restored to the value of the video-control-information field 920. Information 922 is set. In operation 1025, the transmitting device transmits an MAC PDU encapsulated in a MAC header including the recovered pixel-bit-space-size information. Subsequently, the transmission apparatus proceeds to step 1026 in which a MAC header having a bit-division-position value suitable for a channel state as a value of the video-control-type field 910 and a video-control-information field 920 is obtained. Configure. If necessary, the transmitter proceeds to step 1027 to change the MCS, and proceeds to step 1015 to configure and transmit the MAC PDU.

If the result of the check in step 1018 is that the channel state is changed but the channel state is changed, and the channel state can support the amount of video data generated by the bit-space size of the pixel used recently, the transmission device proceeds to step 1023, and the original is not reduced. Check the use of bit-space-size.

If the bit-space size of the recently used pixel is the reduced bit-space-size as a result of the check in step 1023, the transmission device proceeds to step 1021 and proceeds with the subsequent steps.

However, if it is determined in step 1023 that the bit-space size of the recently used pixel is not reduced in size, the transmission device proceeds to step 1026 and proceeds with the subsequent steps.

That is, the transmitting device configures a MAC header having a bit-split-position value suitable for the changed channel state without changing the bit-space-size in step 1021 or 1026, and performs MCS if necessary in step 1021 or 1026. Change, return to step 1015 to configure and transmit the MAC PDU.

FIG. 10 is a view illustrating a beacon message structure for indicating a UEP specification by dynamic bit-splitting and a UEP specification through a beacon message in a wideband high frequency wireless system according to an embodiment of the present invention.

The beacon message is a message (1010a, 1010b) that the transmission and reception devices (1000a, 1000b) constituting the 60 GHz wireless network system always transmits before data communication at all times, the UEP capability information (1011a, 1011b) of the device It may include. In the embodiment of the present invention, it is proposed to include the dynamic bit-split-position change field 1020 in the UEP specification information 1011a and 1011b of the beacon message.

The transmitting / receiving apparatuses 1000a and 1000b may display and confirm the dynamic bit-split-support with the conventional UEP support indication through the dynamic bit-split-position change field 1020 in step 1030. The transmitting / receiving apparatuses 1000a and 1000b confirming whether to support the UEP and the dynamic bit-split-supporting through the beacon message perform video data transmission / reception in accordance with the specification in step 1040. The dynamic bit-division-position change field 1020 included in the UEP specification information 1011a and 1011b in the beacon message may be the same as the bit-division-position field 150 included in the UEP negotiation message in FIG. Or assuming that signaling as shown in FIG. 7 is possible, one bit may indicate whether to support dynamic bit-split.

11 is a diagram illustrating a process of notifying a change of a bit division position or a bit space size through a notification message in a broadband high frequency wireless system according to an exemplary embodiment of the present invention.

FIG. 11 illustrates a method of dynamically changing a bit division position or bit space size through announcement messages 1131a and 1131b in a 60 GHz wireless network system which is a broadband high frequency wireless system. As illustrated in FIG. 10, UEP specification information (Capability) may be checked between the transmitting apparatus 1100a and the receiving apparatus 1100b in operation 1130. If the UEP specification information confirms whether UEP is supported and dynamic bit splitting is supported, the transmitting device 1100a receives the bit splitting position and bit space size information related to the video data configuration through the notification message 1131a before transmitting the video data. May be passed to device 1100b. In addition, the transmitting device 1100a may receive a reception confirmation 1132a about the same from the receiving device 1100b. When the transmission device 1100a determines that the transmission is successfully transmitted through the acknowledgment 1132a, the transmission device 1100a starts transmitting video data in step 1140a. During video data transmission, it may be necessary to change a bit division position or a bit space size due to a channel state change in step 1150. Then, the transmitting device 1100a may transmit the changed bit division position and bit space size information to the receiving device through the notification message 1131b, and may receive a receipt acknowledgment 1132b.

Further, embodiments of the present invention include a computer readable medium having program instructions for performing various computer implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be program instructions that are specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

1 is a diagram illustrating a configuration of a differential error protection transmission apparatus considering a dynamic link according to an embodiment of the present invention;

2 is a diagram illustrating a configuration of a differential error protection receiving apparatus considering a dynamic link according to an embodiment of the present invention;

3 is a diagram illustrating a structure of a UEP negotiation message between a UEP transmitting apparatus and a UEP receiving apparatus according to an embodiment of the present invention;

4 is a diagram illustrating a process of differential error protection considering a dynamic link according to an embodiment of the present invention;

5 is a diagram illustrating a process of adaptively changing a split bit position value for determining importance of pixel component information according to a variable wireless channel state that is a dynamic link according to an embodiment of the present invention;

6 is a diagram illustrating a structure of video data with differential error protection in consideration of a dynamic link according to an embodiment of the present invention;

7 illustrates a structure of video data with differential error protection in consideration of a dynamic link in an IEEE 802.15.3c WPAN system according to an embodiment of the present invention;

8 is a flowchart illustrating a process in the case where differential error protection is not possible in a transmission apparatus for differential error protection in consideration of a dynamic link according to an embodiment of the present invention;

9 is a flowchart illustrating a process in a case where differential error protection is possible in a transmission apparatus for differential error protection in consideration of a dynamic link according to an embodiment of the present invention;

FIG. 10 is a view illustrating a beacon message structure for indicating a UEP specification by dynamic bit-splitting and a UEP specification through a beacon message in a broadband high frequency wireless system according to an embodiment of the present invention;

11 is a diagram illustrating a process of notifying a change of a bit division position or a bit space size through a notification message in a broadband high frequency wireless system according to an exemplary embodiment of the present invention.

Claims (20)

Checking whether the receiving device supports differential error protection and whether dynamic bit splitting is supported in a beacon message received from a receiving device; If it is determined that the receiving apparatus supports the differential error protection and supports the dynamic bit division, the bit space of each pixel component constituting the pixel determined in consideration of the channel state is based on the video information of the input video data. Identifying a bit division position, which is a reference for distinguishing importance in size and each of the pixel components; Classifying importance based on the identified bit division position for each pixel component; And Using error correction encoding to correct a large number of errors for information of high importance for each pixel component, The bit space size and the bit division position are dynamically changed according to a channel state between a transmitting device and the receiving device. Differential error protection method considering dynamic link in transmitting device. The method of claim 1, Checking the bit division position, The differential error protection receiving apparatus transmits and receives an Unequal Error Protection (UEP) negotiation message including the pixel component information, the bit space size information, and the bit division position information, and transmits the bit space size and the Negotiating bit division position Differential error protection method considering dynamic link in transmitting device. The method of claim 1, Receiving the channel state change information, changing the bit space size and the bit division position in consideration of the channel state change information; Differential error protection method considering dynamic link in transmitting device. The method of claim 3, wherein changing the bit space size and the bit division position in consideration of the channel state change information comprises: Sending and receiving a differential error protection negotiation message including the changed bit space size information and the changed bit division position information with a receiving device for differential error protection in consideration of a dynamic link, and changing the changed bit space size for each pixel component. Negotiating the changed bit division position Differential error protection method considering dynamic link in transmitting device. The method of claim 1, The method may further include generating error-coded bits according to the channel state and the importance and classifying the bits according to the importance into frames, and generating the differential error protection video data by modulating the frame with a predetermined modulation method corresponding to the importance. doing Differential error protection method considering dynamic link in transmitting device. The method of claim 5, wherein the differential error protection video data, Priority information indicating the importance of the differential error protection video data, sequence number information indicating the transmission order, modulation and coding scheme (MCS) index information indicating the modulation and channel coding scheme of the video data, and the pixel component information And the bit space size information. Differential error protection method considering dynamic link in transmitting device. The method of claim 5, wherein the differential error protection video data, A MAC header, and a fragmentation control field of the MAC header may include a video control type field and a video control information field. Differential error protection method considering dynamic link in transmitting device. The method of claim 7, wherein in the differential error protection video data, The video control type field is a field defining a type of the video control information field, and the video control information field is used as information representing the bit space size or the bit division position. Differential error protection method considering dynamic link in transmitting device. Transmitting a beacon message including whether differential error protection is supported and whether dynamic bit splitting is supported; Transmitting channel state change information according to the channel state when a channel state between a transmitter and a receiver is changed; Receiving Unequal Error Protection (UEP) video data from the transmission device, bit division, which is a criterion for distinguishing the importance of the bit space size of each pixel component constituting the pixel of the video data and each of the pixel components Identifying a location; Performing corresponding demodulation according to importance information of the differential error protected video data included in the header of the differential error protected video data; Error correcting the demodulated data according to the importance information based on error correction coding classified according to the importance; And Combining the error corrected data for each pixel component in consideration of the confirmed bit space size and the identified bit division position; The bit space size and the bit division position are dynamically changed according to the channel state between the transmitting device and the receiving device. The header of the differential error protection video data includes change count information indicating whether the bit space size and the bit division position change according to the change of the channel state. Differential error protection method considering dynamic link in receiving device. 10. The method of claim 9, Checking the bit division position, Transmitting a differential error protection negotiation message including a differential error protection transmission device and the pixel component information, the bit space size information, and the bit division position information to negotiate the bit space size and the bit division position for each pixel component. Differential error protection method considering dynamic link in receiving device. 10. The method of claim 9, A differential error protection negotiation message including the changed bit space size information and the changed bit division position information is transmitted and received from the differential error protection transmission device to negotiate the changed bit space size and the changed bit division position for each pixel component. Including more steps Differential error protection method considering dynamic link in receiving device. The method of claim 9, wherein the differential error protection video data, Priority information indicating the importance of the differential error protection video data, sequence number information indicating the transmission order, modulation and coding scheme (MCS) index information indicating the modulation and channel coding scheme of the video data, and the pixel component information And change count information indicating the bit space size information and the number of changes of the bit space size and the bit division position according to the change of the channel state. Differential error protection method considering dynamic link in receiving device. The method of claim 9, wherein the differential error protection video data, A MAC header, and a fragmentation control field of the MAC header may include a video control type field and a video control information field. Differential error protection method considering dynamic link in receiving device. The method of claim 13, wherein in the differential error protection video data, The video control type field is a field defining a type of the video control information field, and the video control information field is used as information representing the bit space size or the bit division position. Differential error protection method considering dynamic link in receiving device. If the beacon message received from the receiving device confirms whether the receiving device supports differential error protection and dynamic bit splitting, and if the receiving device supports the differential error protection and determines that the dynamic bit splitting is supported, Based on the video information of the input video data, the bit space size of each of the pixel components constituting the pixel and the bit division position serving as a reference for distinguishing importance in each of the pixel components, which are determined in consideration of the channel state, are identified. A Unequal Error Protection (UEP) transmission controller for controlling to use error correction encoding for correcting a large number of errors for information of high importance for each pixel component; A bit division unit that classifies importance based on the identified bit division position for each pixel component under the control of the differential error protection transmission controller; And A channel coding unit that uses corresponding error correction coding based on the discriminated importance for each pixel component under the control of the differential error protection transmission controller, The bit space size and the bit division position are dynamically changed according to a channel state between a transmitting device and the receiving device. Differential error protection transmission device considering dynamic link. The method of claim 15, wherein the differential error protection transmission controller is: Transmitting a differential error protection negotiation message including a differential error protection receiving device and the pixel component information, the bit space size information, and the bit division position information to negotiate the bit space size and the bit division position for each pixel component. Differential error protection transmission device considering dynamic link. The method of claim 15, wherein the differential error protection transmission controller is: When the channel state change information is received, the bit space size and the bit division position are changed in consideration of the channel state change information. Differential error protection transmission device considering dynamic link. 18. The method of claim 17, wherein the differential error protection transmission controller is The differential error protection reception device transmits and receives a differential error protection negotiation message including the changed bit space size information and the changed bit division position information to determine the changed bit space size and the changed bit division position for each pixel component. Negotiated Differential error protection transmission device considering dynamic link. 16. The method of claim 15, And a modulation unit for outputting differential error protection video data generated by modulating a frame composed of bits classified according to the channel state and the importance of error correction coding by the channel coding unit using a predetermined modulation scheme corresponding to the importance. Containing Differential error protection transmission device considering dynamic link. The method of claim 19, wherein the differential error protection video data, Priority information indicating the importance of the differential error protection video data, sequence number information indicating the transmission order, modulation and coding scheme (MCS) index information indicating the modulation and channel coding scheme of the video data, and the pixel component information And change count information indicating the bit space size information and the number of changes of the bit space size and the bit division position according to the change of the channel state. Differential error protection transmission device considering dynamic link.

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