KR101330632B1 - Transmission packet in new link adaptation mechanism and apparatus and method for transmitting/receiving using the same - Google Patents

Abstract

The present invention relates to a structure of a transport packet in a novel link optimization mechanism, and an apparatus and method for transmitting and receiving using the same.

The structure of a transport packet in the new link optimization mechanism according to an embodiment of the present invention includes a payload composed of a plurality of transport data units, a MAC header added to the payload, and a PHY header added to the MAC header. The payload includes a link estimation process for evaluating a state of a channel for transmitting and receiving the transport packet and a quality of the transport packet, and a link recommendation process for recommending a transmission mode suitable for a current channel state using the result of the evaluation. And a link in which information about a specific transmission mode that can be recommended in the link recommendation process is recorded, among the link optimization mechanisms including a link adjustment process for adjusting a channel state by using information configuring the recommended transmission mode. Contains the structure of a Link Recommendation Command. In addition, the specific transmission mode may include an HRP mode in which an index of a high rate phy mode is recorded and an LRP mode in which an index of a low rate phy mode is recorded.

Millimeter wave, link optimization mechanism, link recommendation process

Description

Transmission packet in new link adaptation mechanism and apparatus and method for transmitting / receiving using the same

1 is a diagram comparing frequency bands between the IEEE 802.11 standard and millimeter wave (mmWave).

2 is a diagram illustrating one pixel component at a plurality of bit levels.

3 is a diagram illustrating a structure of a PPDU of the IEEE 802.11a standard.

4 is a diagram illustrating a link optimization mechanism according to the prior art.

5 illustrates a new link optimization mechanism according to an embodiment of the present invention.

6A is a diagram illustrating an active link recommendation process among new link optimization mechanisms according to an embodiment of the present invention.

6B is a diagram illustrating a manual link recommendation process among new link optimization mechanisms according to an embodiment of the present invention.

7 is a diagram illustrating a structure of a transport packet according to an embodiment of the present invention.

8 is a diagram illustrating the structure of an LR command frame among the structures of a transport packet according to an embodiment of the present invention.

9 is a diagram illustrating an HRP mode index table according to an embodiment of the present invention.

10 is a block diagram of a transmitter according to an embodiment of the present invention.

11 is a block diagram of a receiving apparatus according to an embodiment of the present invention.

(Reference Numerals for Main Parts of the Drawings)

100: transmitting device 110: storage unit

120: bit separation unit 130: channel coding unit

140: header generation unit 150, 210: RF unit

160: mode selection unit 170, 270: transmission mode table

200: receiving device 220: header reading unit

230: channel decoding unit 240: bit combination unit

250: playback unit 260: mode selection unit

700: transport packet structure 710: preamble

720: PHY header 730: MAC header

740: HCS field 750: MPDU

760: Beam Tracking field 770: PLCP header

The present invention relates to wireless communication technology, and more particularly, to a structure of a transport packet in a new link optimization mechanism, and a transmission and reception apparatus and method using the same.

Due to the increase in the demand for the transmission of large-capacity multimedia data, networks have been researched for effective transmission methods in wireless network environments. In addition, there is a growing demand for wireless transmission of high-quality video such as DVD (Digital Video Disk) video and HDTV (High Definition Television) video between various home devices.

At present, a task group of IEEE 802.15.3c is promoting a technical standard for transmitting a large amount of data in a wireless home network. This standard, called mmWave (Millimeter Wave), uses radio waves with a physical wavelength of millimeter in length (ie, radio waves with frequencies in the range of 30 GHz to 300 GHz) for large data transmission. In the past, such a band has been used as a licensed band (unlicensed band) for a limited use, such as for telecommunications operators, radio astronomy, or vehicle collision prevention.

1 is a diagram comparing frequency bands between the IEEE 802.11 standard and millimeter wave (mmWave). IEEE 802.11b and IEEE 802.11g have a carrier frequency of 2.4 GHz and a channel bandwidth of about 20 MHz. In addition, IEEE 802.11a or IEEE 802.11n has a carrier frequency of 5 GHz and a channel bandwidth of about 20 MHz. In contrast, mmWave uses a carrier frequency of 60 GHz and has a channel bandwidth of approximately 0.5 to 2.5 GHz. Therefore, mmWave has a much larger carrier frequency and channel bandwidth than the existing IEEE 802.11 standard. As such, when using a high frequency signal (millimeter wave) having a wavelength in millimeters, several gigabytes can exhibit a very high bit rate (Gbps), and an antenna size of 1.5 mm or less can be achieved. Can be implemented. In addition, the attenuation ratio in the air (attenuation ratio) is very high, there is an advantage that can reduce the interference between devices.

In particular, recent researches have been conducted to transmit uncompressed audio or video data (hereinafter, referred to as uncompressed AV data) between wireless devices using the high bandwidth of the millimeter wave. While compressed AV data is lossy compressed in such a manner as to remove parts less sensitive to human vision and hearing through processes such as motion compensation, DCT conversion, quantization, and variable length coding, uncompressed AV data is a digital representation of a pixel component. The value (for example, R, G, and B components) is included as it is.

Therefore, the bits included in the compressed AV data do not have a superiority for importance, but the bits included in the uncompressed AV data have a superiority. For example, as illustrated in FIG. 2, in the case of an 8-bit image, one pixel component is represented by 8 bits, among which the bit representing the highest order (the highest level bit) is the most significant bit (Most Significant). Bit (MSB), and the bit representing the lowest order (lowest level bit) is the least significant bit (Least Significant Bit (LSB)). In other words, each bit of 8-byte 1-byte data has a different importance in recovering a video signal or an audio signal. If an error occurs in a bit of high importance during transmission, an error can be detected more easily when an error occurs in a bit that is not important. Accordingly, bit data having high importance needs to be protected from errors in wireless transmission as compared to bit data having low importance. However, in the IEEE 802.11 series transmission scheme, an error correction scheme and a retransmission scheme having the same coding rate for all bits to be transmitted are used.

FIG. 3 is a diagram illustrating a structure of a PHY Protocol Data Unit (PPDU) according to the IEEE 802.11a standard. The PPDU 30 is composed of a preamble, a signal field, and a data field. The preamble is a signal for synchronization and channel estimation of the PHY layer, and consists of a plurality of short training signals and a long training signal. The signal field includes a RATE field indicating a transmission rate, a LENGTH field indicating a length of the PPDU, and the like. In general, a signal field is encoded by one symbol. The data field is composed of PSDU, tail bits, and pad bits. The data to be transmitted is included in the PSDU portion.

On the other hand, there is a link optimization mechanism for adaptively coping with the state of a channel that changes from time to time between a transmitting device for transmitting uncompressed AV data and a receiving device for receiving the uncompressed AV data. In the link optimization process, the link is optimized by adjusting parameters such as a data rate, a size of a transmission frame, and a power of a transceiver according to a change in a transmission environment.

However, in the current link optimization mechanism, the timing and method of performing the link optimization depend on the number of valid ACK frames, which results in only the reverse channel situation from the sink device to the source device. The information on the forward channel situation directed to the sink device is ignored and thus there is a problem that a smooth link optimization mechanism cannot be performed.

The present invention has been devised to solve the above problems, and the technical problem to be solved by the present invention is a new link optimization mechanism and the mechanism that can more efficiently and reasonably respond to the transmission environment that changes frequently in high frequency wireless communication. It is to provide the structure of the transport packet used.

Another object of the present invention is to provide an apparatus and a method for transmitting and receiving transport packets in a new link optimization mechanism.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

The structure of a transport packet in a new link optimization mechanism according to an embodiment of the present invention for achieving the above technical problem is a payload consisting of a plurality of transport data units, a MAC header added to the payload, and And a PHY header added to a MAC header, wherein the payload includes a link evaluation process for evaluating a state of a channel for transmitting and receiving the transport packet and a quality of the transport packet, and a result of the evaluation. A specific transmission mode that can be recommended in the link recommendation process among link optimization mechanisms including a link recommendation process for recommending a transmission mode and a link adjustment process for adjusting a channel state by using information constituting the recommended transmission mode. It includes a structure of a link recommendation command in which information about is recorded.

In order to achieve the above technical problem, a transmission / reception apparatus using a new link optimization mechanism according to an embodiment of the present invention includes a payload including a plurality of transmission data units, a MAC header added to the payload, and the MAC header. A transceiver for transmitting and receiving a transport packet including a PHY header added to the payload, the payload, a link evaluation process for evaluating the state of the channel for transmitting and receiving the transport packet and the quality of the transport packet, using the results of the evaluation A link recommendation process for recommending a transmission mode suitable for a current channel state, and a link adjustment process for adjusting a channel state by using information constituting the recommended transmission mode to be recommended in the link recommendation process. Link recommendation command (Lin) in which information about a specific transmission mode that can be recorded is recorded. k Recommendation Command) structure.

According to an aspect of the present invention, there is provided a transmission / reception method using a new link optimization mechanism, including a payload including a plurality of transmission data units, a MAC header added to the payload, and the MAC header. A method of transmitting and receiving a transport packet including a PHY header added to the payload, the payload, a link evaluation process for evaluating the state of the channel for transmitting and receiving the transport packet and the quality of the transport packet, using the results of the evaluation A link recommendation process including a link recommendation process for recommending a transmission mode suitable for a current channel state and a link adjustment process for adjusting a channel state using information constituting the recommended transmission mode may be recommended in the link recommendation process. Link Recomme command that records information about a particular transmission mode. ndation Command).

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a detailed description will be made with reference to block diagrams or flowcharts for explaining a structure of a transport packet in a new link optimization mechanism, and a transmission / reception apparatus and method using the same, which are predefined by preferred embodiments of the present invention.

4 is a diagram illustrating a link optimization mechanism according to the prior art. In the link optimization mechanism, the source device and the sink device exchange messages for channel information using a specific management frame. In more detail, first, the source device sends a series of data frames to the sink device and receives an Ack frame for it. The Low-MAC channel of the source device reports a packet error rate (PER) to the High-MAC channel based on the information recorded in the received Ack frame. The High-MAC channel does not start a link optimization process until the PER falls below a certain threshold.

By the way, in the link optimization mechanism as shown in FIG. 4, when to start link optimization (LA) and how to perform link optimization, etc., information on the ACK frame and packet error rate related to the number of valid ACK frames, etc. Will depend. In general, since the data rate of the forward channel is higher than that of the reverse channel, the data rate of the forward channel is more sensitive to factors such as noise or interference, so that the forward channel situation has more influence on transmission quality than the reverse channel situation. Since the information of the ACK frame and the packet error rate are the reverse channel situation from the sink device to the source device, the information on the forward channel condition from the source device to the sink device is not utilized, and only the information about the reverse channel condition is used. Result.

To solve this problem, the specific transmission mode that can be recommended in the link recommendation process in the link optimization mechanism is divided into two modes, a high rate phy mode and a low rate phy mode. A new link optimization mechanism is proposed, in which a structure of a link recommendation command including two separate modes is carried in a payload of a transport packet and transmitted and received.

5 illustrates a new link optimization mechanism according to an embodiment of the present invention. The new link optimization mechanism consists of three steps, as shown in FIG.

First, the link assessment process (S100) will be described.

The source device transmits data to the sink device, and the sink device evaluates the state of the channel and the quality of the transport packet, and uses the result of the evaluation to set the transmission mode optimized for the current channel state. Information is calculated (S100). The setting information of the transmission mode includes information on a differential error protection encoding (UEP) mode, information on a PHY mode, and a recommendation mask of link adjustment used to determine whether to execute a link adjustment process to be described later. Contains information about

Next, the link recommendation process (S200) will be described. The link recommendation process is a process in which the sink device makes a link recommendation by transmitting a packet accompanying the calculated mode of transmission to the source device. By the link recommendation process, the source device obtains information on a forward channel state and information on setting of a transmission mode recommended by the sink device.

In this link recommendation process, two management frames are used, a link recommendation request command and a link recommendation response command. The structure of these two frames is included in the payload region rather than the header region of the transport packet and transmitted. The link recommendation process is divided into an active mode and a passive mode, which will be described with reference to FIGS. 6A and 6B.

6A is a diagram illustrating an active link recommendation process among new link optimization mechanisms according to an embodiment of the present invention, and FIG. 6B is a diagram illustrating a passive link recommendation process.

Referring to FIG. 6A, the source device sends data to the sink device and receives an Ack message therefor (S210). During this information exchange, the source device sends a link recommendation request command (LR Request Command) to the sink device, and receives an Ack message for this (S220). After the sink device finishes calculating the setting information of the transmission mode optimized for the current channel state, the sink device sends a link recommendation response command (LR Response Command) to the source device and receives an ACK message thereof (S230). .

By this link recommendation process, the source device obtains information on channel status and signal quality from the sink device in real time. Based on the information thus obtained, the source device transmits general data to the sink device again and receives an Ack message thereof (S240). If the state of the channel changes again or the quality of the signal changes again, a link recommendation request command (LR Request Command) is sent back to the sink device, and the sink device returns a link recommendation response command (LR Response Command) to the source device. The process (S220, S230) is performed again.

However, unlike the active mode of FIG. 6A, a passive mode in which the sink device sends a link recommendation response command (LR Response Command) to the source device without the link recommendation request of the source device is illustrated in FIG. 6B. In the passive mode, the sink device itself determines whether to provide information about the state of the channel or the quality of the signal, or when to provide the information. In the manual mode, the link recommendation process is a process in which the sink device determines the recommended setting information of the transmission mode when the channel deteriorates to an extent that data transmission and reception are not suitable during data transmission. can see. That is, while exchanging data and Ack messages (S260), when it is determined that the channel state is deteriorated, the sink device first sends a link recommendation response command (LR Response Command) to the source device and receives the Ack message therefor (S270). ).

The active mode and the passive mode may be applied separately, but the two modes may be applied together according to channel conditions.

Referring to FIG. 5 again, the source device performs a link adjust process by appropriately adjusting parameters included in the setting information of the transmission mode recommended by the sink device (S300). Parameters that can be adjusted in this process are UEP information, beam searching information, information on the adjustment of the HRP mode and LRP mode. That is, when the source device receives data (setting information) in which the LR Response command is recorded from the sink device, whether to perform a link adjustment process based on the received setting information and the source device's determination of the current channel state. The decision is made.

On the other hand, the source device and sink device in the above-described link optimization mechanism is a concept introduced in order to focus on the flow of data, the source device is not only a general transmission device but also a reception device The sink device may also serve as both a transmitting device and a receiving device.

7 is a diagram illustrating a structure of a transport packet according to an embodiment of the present invention. The transport packet 700 largely includes a physical layer convergence protocol (PLCP) header 770, an MPDU field 750, and a beam tracking field 760. The PLCP header 770 is further divided into a preamble 710, a PHY header 720, a MAC header 730, and an HCS field 740.

The preamble 710 is a signal for synchronization and channel estimation of the PHY layer, and is generally composed of a plurality of short training signals and long training signals.

The PHY header 720 is an area generated based on the information used in the PHY layer, and the MAC header 730 is an area generated based on the information used in the MAC layer. The header check sequence (HCS) field 740 is an area used to check whether a header error is used to check whether an error has occurred in the PLCP header 770.

The MAC Protocol Data Unit (MPDU) field 750 is an area in which data to be actually transmitted, that is, uncompressed AV data that is error corrected and encoded at a predetermined code rate, is recorded. It is also an area including the structure of a link recommendation command in which information about a specific transmission mode (eg, HRP mode and LRP mode) that can be recommended in the link recommendation process is recorded. . The structure of the link recommendation command will be described later in FIG. 8.

The beam tracking field 760 is an area in which additional information for beam steering is recorded. Beam steering means setting the directionality of the antenna to suit the direction of reception of the directional radio signal. For example, a receiving device for receiving a directional radio signal receives the same radio signal having different phases from an array antenna, and then performs a DOA (Discrete Fourier Transform) from a sum of the received signals. of arrival) and optimize the array antenna in the corresponding direction by establishing the direction of the received signal through the combination of amplitude and phase. To this end, the beam tracking field 760 records information referred to when establishing the antenna's direction in the receiving device.

The role of the MPDU 750, that is, the payload, in the above-described structure of the transport packet will be described in more detail with reference to FIG. 8. 8 is a diagram illustrating the structure of a link recommendation command frame 751 in the structure of a transport packet according to an embodiment of the present invention. As shown in FIG. 8, the MPDU 750 corresponding to the payload includes a link recommendation command 751 in which information on a specific transmission mode that can be recommended in the aforementioned link recommendation process is recorded. ) Structure is included.

Here, the specific transmission mode includes an HRP mode in which an index of a high rate phy mode is recorded and an LRP mode in which an index of a low rate phy mode is recorded.

In the link optimization mechanism, there are two logical channels, one of which is a high rate PHY (hereinafter referred to as HRP) channel having a transmission rate of several Gbps to several tens of Gbps, and the other of which has a low rate of several tens of Mbps. PHY (hereinafter referred to as LRP) channel. Accordingly, it can be seen that the HRP mode fields 752d and 753d and the LRP mode fields 752c and 753c are separately recorded in the lower field constituting the link recommendation command frame 751. In particular, the HRP mode fields 752d and 753d include information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in a transmission data unit, and information on encoding rates of the bit levels. A mode index indicating a combination is recorded, and an index number of one of the mode indexes can be selected from a predetermined transmission mode table. When one of the index numbers is selected from the transmission mode table, the combination of the information corresponding to the selected index number becomes the new setting information (Recommended setting) of the transmission mode. An example of the table showing the combination of such information is shown in FIG. 9. Is shown. The table will be described later in the description of FIG. 9.

On the other hand, the link recommendation command 751 is a link recommendation request command for requesting a transmitting device that transmits the transport packet to recommend the setting information of the transmission mode to a receiving device that receives the transport packet. Recommendation Request Command 752 and a Link Recommendation Response Command 753 that the receiving device responds to the link recommendation request to the transmitting device.

First, looking at the structure of the link recommendation request command 752, it can be seen that it includes an HRP mode field 752d in which information about the HRP mode is recorded, and an LRP mode field 752c in which information about the LRP mode is recorded. have. In addition, the link recommendation request command 752 includes a command ID field 752a in which the ID of the link recommendation request command 752 is recorded, and a length field 752b indicating the length of the link recommendation request command 752. And a Reserved field 752e for future preliminary use.

Looking at the number of bits of the fields, the command ID field 752a and the length field 752b have 8 bits (1 octet), the HRP mode field 752d and the LRP mode field 752c each have 1 bit, The reserve field 752e has a length of 6 bits.

Next, looking at the structure of the link recommendation response command (753), it can be seen that includes the HRP mode field (753d) and LRP mode field (753c). The link recommendation response command 753 further includes a command ID field 753a in which the ID of the link recommendation response command 753 is recorded, and a length field 753b indicating the length of the link recommendation response command 753. And a Reserved field 753e for future preliminary use.

Looking at the number of bits of the fields, the command ID field 753a and the length field 753b have 8 bits (1 octet), the HRP mode field 753d and the LRP mode field 753c each have 4 bits, The reserve field 753e has a length of 8 bits.

9 is a diagram illustrating an HRP mode index table according to an embodiment of the present invention. As described above, the combination of the mode index recorded in the HRP mode fields 752d and 753d and the information corresponding to the mode index is recorded.

Looking at the table of FIG. 9, it is defined that the HRP mode index can have a value from 0 to 6. However, this is only an example and may be defined as being able to have a value from 0 to 15 in the case of 4 bits. Fields indicating items such as grouping information (the number of bit levels included in one group), coding rates, modulation schemes, and the like may be arranged respectively. However, when the mode index is used, a plurality of items may be provided as one index. There is an advantage that can represent a combination. The table of FIG. 9 may be previously promised between the source device and the sink device or transmitted from the source device to the sink device.

When the HRP mode index is 0 to 2, EEP (Equal Error Protection) is applied, and when 3 to 4, UEP is applied. If the HRP mode index is 3, QPSK is applied as a modulation method, and if 4, 16-QAM is applied. In this case, a coding rate of 4/5 is relatively low for the upper bit level, and 4/5 is relatively high for the lower bit level. However, even in this case, since the average coding rate for the entire bit level is 2/3, it can be seen that the size of data to be transmitted is the same as the case where the HRP mode indexes are 1 and 2. Meanwhile, when the HRP mode indexes are 5 and 6, a transmission error occurs and retransmission is performed. In this retransmission, only the upper bit level of relatively high importance is retransmitted at a coding rate of 1/3, and the lower bit level of relatively low importance is not transmitted (the encoding rate is infinite).

10 is a block diagram of a transmitting device 100 according to an embodiment of the present invention. The transmitter 100 includes a storage unit 110, a bit separator 120, a channel coding unit 130, a header adder 140, an RF (150) unit, and a mode selector 160. ), And a transmission mode table 170.

The storage unit 110 stores uncompressed AV data. When the AV data is video data, sub-pixel values for each pixel are stored. The subpixel values may be stored in various values according to the color space (eg, RGB color space, YCbCr color space, etc.) used, but in the present invention, each pixel may be R (Red), G (Green) according to the RGB color space. ) And B (Blue) will be described as consisting of three subpixels. Of course, when the video data is a gray image, since only one subpixel component exists, one subpixel may form pixels as it is, and two or four subpixel components may form one pixel.

The bit separator 120 separates the subpixel values provided from the storage 110 from bits of high order (high bit level) to bits of low order (low bit level). For example, in the case of 8-bit video, since orders exist from 2 ⁷ to 2 ⁰ , it can be separated into a total of 8 bits. Here, m represents the number of bits per pixel, Bit _{m -1} represent the bits of the m-1 order. As such, the bit separation process is performed independently for each subpixel.

The channel coding unit 130 generates a payload by performing error correction encoding on the separated bits at an appropriate coding rate according to their importance. Such error correction coding includes block coding and convolutional coding. In block coding (eg, Reed-Solomon coding), data is encoded and decoded in predetermined block units, and convolutional coding uses a predetermined length of memory. It is a technique that performs encoding by comparing previous data with current data.

In general, error correction encoding is performed by converting an input k-bit into an n-bit codeword. At this time, the coding rate is expressed as "k / n". The lower the coding rate, the greater the probability of error correction because it is coded with a larger bit codeword than the input bit. When the error correction encoding result is collected, a payload, that is, an MPDU 750 is formed.

The header generation unit 140 generates and adds a preamble 710, a PHY header 720, and a MAC header 730 to the MPDU 750 including a plurality of encoded TDUs. 700). At this time, the HRP mode index is recorded in the PHY header 720. As described above, the HRP mode index represents a combination of grouping information (grouping method of the TDU), a coding rate, a modulation method, and the like, and is provided by the mode selector 160.

The RF unit 150 modulates a transmission packet provided by the header generator 140 using a modulation scheme provided from the mode selector 160 and transmits the transmitted packet through an antenna.

The mode selector 160 selects one mode index from the transmission mode table 170 as shown in the table of FIG. 9 based on the transmission environment of the transport packet. The mode selector 160 provides the grouping information and the coding rate information according to the mode index to the channel coding unit 130, and the modulation scheme according to the mode index to the RF unit 150.

11 is a block diagram of a receiving apparatus 200 according to an embodiment of the present invention. The reception apparatus 200 includes an RF unit 210, a header reader 220, a channel decoder 230, a bit combiner 240, a playback unit 250, a mode selector 260, and a transmission mode table. And 270.

The RF unit 210 demodulates the received radio signal and restores the transport packet. The demodulation scheme applied to the demodulation may be provided from the mode selector 260.

The header reading unit 220 reads the PHY header and the MAC header added by the header generating unit 140 of FIG. 10, and provides the channel decoding unit 230 with the MPDU, that is, the payload, from which the headers are removed. At this time, the header reading unit 220 reads the mode index recorded in the PHY header 720 and provides it to the mode selecting unit 260.

The mode selector 260 selects the grouping information, the coding rate, and the demodulation method corresponding to the mode index provided from the header reader 220 by referring to the transmission mode table 270. 210, and the grouping information and the coding rate are provided to the channel decoding unit 230. The RF unit 210 will demodulate the radio signal according to the demodulation scheme.

The channel decoder 230 identifies the TDU types constituting the current MPDU through grouping information (the number of bit levels included in the TDU) provided from the mode selector 260, and uses the coding rate applied to the corresponding TDU. Perform corrective decoding. The coding rate is also provided from the mode selector 260. The error correction decoding is an inverse process of error correction coding in the channel coding unit 150, and is a process of restoring k bits of original data from an n-bit codeword.

A bit assembler 240 restores each subpixel component by combining the output bits for each bit level (from the highest level to the lowest level). Each subpixel component (eg, R, G, and B components) restored by the bit combination unit 240 is provided to the reproduction unit 250.

The playback unit 270 collects each subpixel component, that is, pixel data, and when one video frame is completed, matches the video frame to a reproduction ray signal (CRT), a liquid crystal display (LCD), a PDP ( Display on a display device such as a Plasma Display Panel.

In the above, video data is taken as an example of uncompressed AV data, but it will be understood by those skilled in the art that the same method can be applied to uncompressed audio data such as a wave file.

Each component of FIGS. 10 through 11 may be software such as a task, a class, a subroutine, a process, an object, an execution thread, a program, or a field-programmable gate array (FPGA) or an ASIC performed in a predetermined area on a memory. It may be implemented in hardware such as an application-specific integrated circuit, or may be a combination of software and hardware. The components may be included in a computer-readable storage medium, or a part of the components may be distributed to a plurality of computers.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

According to one embodiment of the invention, one or more of the following effects are present.

Provides a new link optimization mechanism that can more efficiently and reasonably respond to a transmission environment that changes frequently in high-frequency wireless communication, the structure of the transport packet used in the mechanism, and an apparatus and method for transmitting and receiving transport packets in the link optimization mechanism can do.

In addition, the link optimization process may utilize a link recommendation process using information on the forward channel situation from the source device to the sink device.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

Claims (33)

In the structure of the transport packet comprising a payload consisting of a plurality of transmission data units, a MAC header added to the payload, and a PHY header added to the MAC header, the payload is, A link evaluation process for evaluating a state of a channel for receiving and transmitting the transport packet and a quality of the transport packet, a link recommendation process for recommending a transmission mode selected by the receiving device using a result of the evaluation, and the recommended Link Recommendation Command that records information about a transmission mode that can be recommended in the link recommendation process among link optimization mechanisms including a link adjustment process for adjusting a channel state by using information constituting a transmission mode. The structure of the transport packet in the new link optimization mechanism, including the structure of. The method of claim 1, The transmission mode is, A structure of transport packets in a new link optimization mechanism, including an HRP mode in which an index of a High Rate Phy mode is recorded and an LRP mode in which an index of a Low Rate Phy mode is recorded. The method of claim 1, The link recommendation command is A Link Recommendation Request Command requesting a transmitting device to transmit the transport packet to recommend the link to the receiving device receiving the transport packet, and the receiving device requests the link recommendation device to the transmitting device. The structure of the transport packet in the new link optimization mechanism, including a Link Recommendation Response Command that responds to. The method of claim 3, wherein The link recommendation request command is A structure of transport packets in a new link optimization mechanism, comprising an HRP mode field in which information about the HRP mode is recorded and an LRP mode field in which information about the LRP mode is recorded. 5. The method of claim 4, The link recommendation request command is The structure of the transport packet in the new link optimization mechanism further includes a command ID field in which the ID of the link recommendation request command is recorded, a length field indicating a length of the link recommendation request command, and a reserved field. . 6. The method of claim 5, Wherein the command ID field and the length field are 8 bits, the HRP mode field and the LRP mode field are 1 bit each, and the reserve field has a length of 6 bits. The method of claim 3, wherein The link recommendation response command is A structure of transport packets in a new link optimization mechanism, comprising an HRP mode field in which information about the HRP mode is recorded and an LRP mode field in which information about the LRP mode is recorded. The method of claim 7, wherein The link recommendation response command is The structure of a transport packet in the new link optimization mechanism further includes a command ID field in which the ID of the link recommendation response command is recorded, a length field indicating a length of the link recommendation response command, and a reserved field. . 9. The method of claim 8, Wherein the command ID field and the length field are 8 bits, the HRP mode field and the LRP mode field are 4 bits each, and the reserve field is 8 bits long. 5. The method of claim 4, In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Structure of transport packets in mechanism. The method of claim 7, wherein In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Structure of transport packets in mechanism. In the transceiver for transmitting and receiving a transmission packet comprising a payload consisting of a plurality of transmission data unit, a MAC header added to the payload, and a PHY header added to the MAC header, the payload is, A link evaluation process for evaluating a state of a channel for receiving and transmitting the transport packet and a quality of the transport packet, a link recommendation process for recommending a transmission mode selected by the receiving device using a result of the evaluation, and the recommended Link Recommendation Command that records information about a transmission mode that can be recommended in the link recommendation process among link optimization mechanisms including a link adjustment process for adjusting a channel state by using information constituting a transmission mode. Transceiving device using a new link optimization mechanism, including the structure of. 13. The method of claim 12, The transmission mode is, A transmission / reception apparatus using a new link optimization mechanism, including an HRP mode in which an index of a high rate phy mode is recorded and an LRP mode in which an index of a low rate phy mode is recorded. 13. The method of claim 12, The link recommendation command is A Link Recommendation Request Command requesting a transmitting device to transmit the transport packet to recommend the link to the receiving device receiving the transport packet, and the receiving device requests the link recommendation device to the transmitting device. And a link recommendation response command for responding with a new link optimization mechanism. 15. The method of claim 14, The link recommendation request command is And a HRP mode field in which information about the HRP mode is recorded, and an LRP mode field in which information about the LRP mode is recorded. 16. The method of claim 15, The link recommendation request command is And a command ID field in which the ID of the link recommendation request command is recorded, a length field indicating a length of the link recommendation request command, and a reserved field. 17. The method of claim 16, And a length of 8 bits for the command ID field and the length field, 1 bit for the HRP mode field and the LRP mode field, and 6 bits for the reserved field. 6. 15. The method of claim 14, The link recommendation response command is And a HRP mode field in which information about the HRP mode is recorded, and an LRP mode field in which information about the LRP mode is recorded. The method of claim 18, The link recommendation response command is And a command ID field in which the ID of the link recommendation response command is recorded, a length field indicating a length of the link recommendation response command, and a reserved field. 20. The method of claim 19, And the command ID field and the length field are 8 bits, the HRP mode field and the LRP mode field are 4 bits each, and the reserve field has a length of 8 bits. 16. The method of claim 15, In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Transmitter and receiver using mechanism. The method of claim 18, In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Transmitter and receiver using mechanism. In the transmission and reception method for transmitting and receiving a transmission packet comprising a payload consisting of a plurality of transmission data units, a MAC header added to the payload, and a PHY header added to the MAC header, the payload is, A link evaluation process for evaluating a state of a channel for receiving and transmitting the transport packet and a quality of the transport packet, a link recommendation process for recommending a transmission mode selected by the receiving device using a result of the evaluation, and the recommended Link Recommendation Command that records information about a transmission mode that can be recommended in the link recommendation process among link optimization mechanisms including a link adjustment process for adjusting a channel state by using information constituting a transmission mode. A method for transmitting and receiving using the new link optimization mechanism, including the structure of. 24. The method of claim 23, The transmission mode is, A transmission / reception method using a new link optimization mechanism, including an HRP mode in which an index of a high rate phy mode is recorded and an LRP mode in which an index of a low rate phy mode is recorded. 24. The method of claim 23, The link recommendation command is A Link Recommendation Request Command requesting a transmitting device to transmit the transport packet to recommend the link to the receiving device receiving the transport packet, and the receiving device requests the link recommendation device to the transmitting device. A method of transmitting and receiving using the new link optimization mechanism, comprising a Link Recommendation Response Command responding to the request. 26. The method of claim 25, The link recommendation request command is And a HRP mode field in which information about the HRP mode is recorded, and an LRP mode field in which information about the LRP mode is recorded. 27. The method of claim 26, The link recommendation request command is And a command ID field in which the ID of the link recommendation request command is recorded, a length field indicating a length of the link recommendation request command, and a reserved field. 28. The method of claim 27, And the command ID field and the length field are 8 bits, the HRP mode field and the LRP mode field are 1 bit each, and the reserve field has a length of 6 bits. 26. The method of claim 25, The link recommendation response command is And a HRP mode field in which information about the HRP mode is recorded, and an LRP mode field in which information about the LRP mode is recorded. 30. The method of claim 29, The link recommendation response command is And a command ID field in which the ID of the link recommendation response command is recorded, a length field indicating a length of the link recommendation response command, and a reserved field. 31. The method of claim 30, And the command ID field and the length field are 8 bits, the HRP mode field and the LRP mode field are 4 bits each, and the reserve field is 8 bits long. 27. The method of claim 26, In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Transmission and reception method using mechanism. 30. The method of claim 29, In the HRP mode field, A new link optimization, in which a mode index indicating a combination of information on an encoding mode, information on a modulation scheme, information on the number of bit levels included in the transmission data unit, and information on encoding rates of the bit levels is recorded. Transmission and reception method using mechanism.

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