KR100950532B1 - Method and apparatus for generating data frame - Google Patents

Abstract

The present invention relates to a method for generating a data frame, and an embodiment of the present invention generates a plurality of subframes using at least one Mac service data unit (MSDU), and differential error correction encoding is performed on the subframes. At least one of a UEP field indicating whether UE (UEP) is applied, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and a length field indicating the length of each of the subframes After generating C, a data frame is generated using at least one of the UEP field, MCS field, and length field and subframes.

Description

Method and apparatus for generating data frame

The present invention relates to a method and apparatus for generating a data frame.

WPAN is a network that provides wireless connectivity in a relatively short personal operating space, such as a home or office. In WPAN, devices communicate in a TDMA manner in a piconet that has a range of about 10m and forms an ad hoc network.

The IEEE 802.15 Working Group (WG) was created to provide a communication standard in the Personal Operating Space, and among the four TGs (Task Group) belonging to the IEEE 802.15 WG, IEEE 802.15.3 provides high-speed data. The standardization of HR (High Rate) -WPAN for transmission is completed.

1 is a diagram illustrating a structure of a general data frame used in a WPAN.

The preamble 110 is a field in which patterns for packet detection, symbol synchronization, frequency synchronization, and the like are recorded.

The PHY header 120 is a field in which information on the length of the frame body, the data rate of the frame body, and the like is recorded. The PHY header 120 is a header of the physical layer, and the MAC header 130 is a header used in the MAC layer.

The MAC Service Data Unit (MSDU) 140 is data that the MAC layer receives from an upper layer, and is a portion that becomes a payload of a MAC Protocol Data Unit (MPDU) delivered to a PHY layer through a service of the MAC layer.

The frame check sequence (FCS) 150 is a field in which a cyclic redundancy check (CRC) code is recorded so that a reception side can detect such an error when an error due to transmission occurs in a data frame.

The object of the invention relates to a method and an apparatus for generating a data frame.

According to an aspect of the present invention, there is provided a method of generating a data frame, comprising: generating a plurality of subframes using at least one Mac service data unit (MSDU); A UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively Generating at least one field of the length field indicating the length of the; And generating a data frame using at least one of the UEP field, the MCS field, and the length field and the subframes.

Preferably, the method for generating a data frame according to an embodiment of the present invention further comprises generating a subframe header including the MCS field and the length field, and generating the data frame comprises the UEP. A data frame is generated using at least one of a field and the subframe header and the subframes.

Preferably, the method for generating a data frame according to an embodiment of the present invention further comprises generating a PHY header including the subframe header and the UEP field, wherein generating the data frame comprises: A data frame is generated using the header, the MAC header and the subframes.

Preferably, the PHY header further includes at least one of a merge information field indicating whether the subframes are aggregated and a subframe number field indicating the number of the subframes.

Preferably, the generating of the data frame may include generating a data frame including a header group including a PHY header and a MAC header, and a payload including the subframes and the subframe header. The group is created by applying an MCS that yields a lower data rate than the MCS applied to the payload.

Advantageously, generating the data frame generates a data frame comprising the subframe header, a header group comprising a PHY header and a MAC header, and a payload comprising the subframes, wherein the header group comprises the payload. The MCS is generated by applying a lower data rate than the MCS applied to the load.

Preferably, the subframe header includes at least one of an MSDU identification field including information for identifying an MSDU used to generate each of the subframes, and a fragmentation information field indicating whether the subframes are fragmented. It further includes.

Advantageously, generating the subframes comprises only the first type bits using first type bits and second type bits extracted from each of the at least one Mac service data unit (MSDU). And generating a subframe including only the second type bits.

Advantageously, generating the subframes further comprises fragmenting each subframe comprising only the first type bits and a subframe comprising only the second type bits.

In addition, an apparatus for generating a data frame according to an embodiment of the present invention for achieving the above object comprises: a subframe generation unit for generating a plurality of subframes using at least one Mac service data unit (MSDU); A UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively A field generator for generating at least one field among length fields indicating the length of the field; And a data frame generator for generating a data frame using at least one of the UEP field, the MCS field, the length field, and the subframes.

Preferably, the apparatus for generating a data frame according to an embodiment of the present invention further includes a header generator for generating a subframe header including the MCS field and the length field, and the data frame generator includes the UEP field and A data frame is generated using at least one of the subframe headers and the subframes.

In addition, an embodiment of the present invention to generate a plurality of sub-frames using at least one Mac service data unit (MSDU) to achieve the above object; A UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively Generating at least one field of the length field indicating the length of the; And generating a data frame using at least one of the UEP field, the MCS field, and the length field and the subframes. To provide.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a flowchart illustrating an embodiment of a data frame generation method according to the present invention.

In operation 210, a plurality of subframes are generated using at least one Mac service data unit (MSDU).

The MSDU may be composed of more significant bits (MSB) and least significant bits (LSB).

If the MSDU is data compressed through a compression algorithm such as MPEG or JPEG, all bits will have the same importance. If uncompressed data such as RGB data, the information contained in each bit will have different importance. For example, in the case of RGB data, the upper four bits of one byte generally have more important information than the lower four bits. As such, the relatively significant bits in each byte of the MSDU are referred to as More Significant Bits (MSB) and the less significant bits as LSB (Less Significant Bits). How many bits from one byte become the MSB may vary depending on the type of data and the implementation. However, all bits other than the MSB in one byte become LSBs.

According to an embodiment, one MSDU may be divided into two subframes such as a subframe including only the MSB and a subframe including only the LSB.

In another implementation, a subframe including such an MSB and a subframe including only an LSB may be fragmented to generate a plurality of subframes.

In the drawings of the present specification, a subframe may be referred to as a subpacket. Since such a subpacket is the same term as a subframe, the terms subframe and subpacket will be used herein.

In step 220, a UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively. Generate at least one field of the length field indicating the length of.

In this case, when the MCS applied to each subframe is different and the length of each subframe is different, an MCS field and a length field may be generated for each subframe. However, when the MCS applied to all subframes is the same and the lengths of all subframes are also the same, one MCS field indicating the MCS applied to all subframes and one length field indicating the length of all subframes may be generated. have.

In operation 230, a data frame is generated using at least one of a UEP field, an MCS field, and a length field and subframes.

The data frame according to the embodiment of the present invention uses the MCS field and the length field as described above, and together with the subframes, information about the MCS applied to each of the subframes and information about the length of each of the subframes together. Since it can be transmitted, there is an advantage in that it can be transmitted by varying the length and the MCS of each subframe according to the type and importance of the data included in the subframe.

3 is a diagram illustrating an embodiment of a data frame structure according to the present invention.

Referring to FIG. 3, a data frame structure according to an embodiment of the present invention includes a PHY header 310, a delimiter 320, and a payload 330.

The PHY header 310 includes a UEP field 312, a merge information field 314, a subframe number field 316, and subframe headers 318.

The UEP field 312 indicates whether UEP is applied to the subframes.

In the present embodiment, the UEP field 312 indicates that UEP is applied to subframes.

The merge information field 314 indicates whether subframes are aggregated.

The subframe number field 316 indicates the number of subframes constituting the payload 330.

The subframe headers 318 represent information on the subframes, and are composed of N subframe headers 318 corresponding to the N subframes. At this time, each of the subframe headers 318 includes an MCS field 318a and a length field 318b.

The MCS field 318a represents the MCS applied to each of the subframes, and the length field 318b represents the length of each of the subframes. As such, in the present embodiment, the MCS field 318a and the length field 318b of FIG. 2 are included in the subframe header 318. Thus, the MCS and the length of each of the subframes are included in the subframe headers 318. Since is indicated, a data frame can be generated using subframes having various lengths and MCS.

The delimiter 320 is a field including information for indicating a boundary for distinguishing the payload 330 from the header.

The payload 330 includes subframes 332 composed of the MSB and the LSB and a cyclic redundancy check (CRC) 334 for detecting an error of the MSB and the LSB of each of the subframes.

In some implementations, the PHY preamble, PHY header 310, MAC header 320, and header CRC may be classified into a header group, which has a lower data rate than the MCS applied to the payload 330. This calculated MCS can be applied.

Other fields shown in the data frame structure shown in FIG. 3 are described in the IEEE 802.15.3C standard document, and thus description of these fields is omitted.

4 illustrates a second embodiment of a data frame structure according to the present invention.

Referring to FIG. 4, a data frame according to an embodiment of the present invention includes a PHY header 410, subframe headers 420, subframes 432 for an MSB of an MSDU, and a subframe for an LSB of an MSDU. And 434.

Information indicating whether the UEP is applied to the subframes is recorded in the PHY header 410, and in the present embodiment, the PHY header 410 indicates that the UEP is applied to the subframes.

Each of the sub frame headers 420 includes an MSDU number field 422, a fragmentation information field 424, and a sub frame length field 426.

The MSDU Number field 422 records the number of the MSDU used to generate each of the subframes 423 and 434 to identify which MSDU used to generate each of the subframes 432 and 434. Field. For example, if a subframe is generated by being fragmented from the first MSDU, 1 may be recorded as an MSDU number in the MSDU number field 422. Can be recorded. However, in some embodiments, the MSDU identification field may be included in place of the MSDU number field 422, and an identifier for identifying the MSDU may be recorded in the MSDU identification field instead of the MSDU number.

The fragmentation information field 424 is a field indicating whether subframes are fragmented. Subframes in the embodiment of FIG. 4 correspond to fragmented subframes.

More specifically, the subframes 432 and 434 of FIG. 4 are divided into subframes in which one MSDU 430 includes only the MSB and subframes containing only the LSB, and includes only the MSBs generated in this way. Subframes each including only the frame and the LSB are fragmented subframes 432 and 434.

Through this process, in FIG. 4, one MSDU is fragmented into L subframes, and the total number of subframes generated for all M MSDUs is M X L = N.

In some implementations, subframes fragmented from at least one MSDU may not be included in the same data frame, but may be included in different data frames. For example, when all N subframes are generated from M MSDUs, K subframes, which are some of them, may be included in the same data frame, and the remaining N-K subframes may be included in the next data frame.

Referring to FIG. 4, subframe headers 420 for respective subframes are positioned in front of each of the subframes 432 and 434 generated in this manner, and behind the subframes 432 and 434. An FCS for detecting an error of the subframes 432 and 434 and the subframe headers 420 is located.

The sub frame length field 426 indicates the length of each of the sub frames.

As such, the embodiment of FIG. 4 differs from the embodiment of FIG. 3 in that the subframe headers 420 are located in the payload together with the subframes 432 and 434.

In addition, in FIG. 4, since the subframe headers 420 are located in the payload, the MCS of calculating the same data rate as the MCS applied to the subframes 432 and 434 may also be applied to the subframe headers 420. have.

In this case, the preamble, the PHY header 410, the MAC header, and the HCS may be applied with an MCS according to PHY mode 0, which is the lowest data rate. Corresponds to the MCS, which yields a lower data rate than the MCS applied to). Accordingly, the probability that an error occurs in the preamble, the PHY header 410 and the MAC header is lower than the sub headers 420 and the sub frames 432 and 434.

Other fields in the data frame structure shown in FIG. 4 are described in the IEEE 802.15.3C standard document, and thus description of these fields is omitted.

5 shows a third embodiment of a data frame structure according to the present invention.

Referring to FIG. 5, a data frame according to an embodiment of the present invention includes a PHY header 510, subframe headers 520, subframes 532 for the MSB of the MSDU, and a subframe for the LSB of the MSDU. And 534.

Although the embodiment of FIG. 5 has commonality with the embodiment of FIG. 4 in that the subframes 532 and 534 are fragmented and generated subframes 532 and 534, the subframe headers 520 are payable. The difference is that the PHY header 510 is located in a header group including the MAC header, not located in the load.

Accordingly, in the embodiment of FIG. 5, the MCS according to PHY mode 0, which is the lowest data rate, may be applied to the subframe headers 520.

Except for such differences, the description of the embodiment of FIG. 5 is the same as that of the embodiment of FIG. 4, and thus description thereof will be omitted.

6 shows a fourth embodiment of a data frame structure according to the present invention.

Referring to FIG. 6, a data frame according to an embodiment of the present invention includes a PHY header 610, subframe headers 620, subframes 632 for the MSB of the MSDU, and a subframe for the LSB of the MSDU. Field 634.

The embodiment of FIG. 6 has in common with the embodiment of FIG. 4 in that the subframe headers 620 are located in the payload, but the embodiment of FIG. 4 in that the subframes 632 and 634 are not fragmented. It differs from the example.

That is, in FIG. 6, one MSDU 630 is divided into a subframe 632 including only an MSB and a subframe 634 including only an LSB, and each subframe 632 and 634 is not fragmented. Do not.

In addition, in the embodiment of FIG. 6, each of the sub frame headers 620 includes an MSDU number field 622 and a fragmentation information field 624. According to an embodiment, the sub frame header 620 may include subframes ( It may further include a length field indicating the lengths of 632 and 634.

Except for such differences, the description of the embodiment of FIG. 6 is the same as that of the embodiment of FIG. 4, and thus description thereof will be omitted.

7 illustrates a fifth embodiment of a data frame structure according to the present invention.

Referring to FIG. 7, a data frame according to an embodiment of the present invention includes a PHY header 710, subframe headers 720, subframes 732 for the MSB of the MSDU, and a subframe for the LSB of the MSDU. 734.

Although the embodiment of FIG. 7 has commonality with the embodiment of FIG. 5 in that subframes 732 and 734 are not located in the payload, but are located in a header group including the PHY header 710 and the MAC header. The subframes 732 and 734 differ from the embodiment of FIG. 5 in that they are not fragmented.

In addition, in the embodiment of FIG. 7, each of the subframe headers 720 includes an MSDU number field 722 and a fragmentation information field 724. In some embodiments, the subframe header 720 may include subframes ( It may further include a length field indicating the lengths 732 and 734.

Except for such differences, the description of the embodiment of FIG. 7 is the same as that of the embodiment of FIG. 5, and thus description thereof will be omitted.

8 illustrates a sixth embodiment of a data frame structure according to the present invention.

The PHY header 810 of FIG. 8 includes an MCS field 811, a UEP field 812, a merge information field 814, a length field 814, and a subframe number field 815.

In the embodiment of FIG. 8, the MCS field 811, the length field 814, and the like are not generated corresponding to each of the subframes included in the payload 820, but instead of one MCS field 811. Since only the length field 814 is generated, all subframes have the same MCS and length.

9 is a diagram illustrating an embodiment of a data frame generation apparatus according to the present invention.

Referring to FIG. 9, a data frame generating apparatus 900 according to an embodiment of the present invention includes a subframe generator 910, a field generator 920, a header generator 930, and a data frame generator 940. It includes.

The subframe generation unit 910 generates a plurality of subframes using at least one Mac service data unit (MSDU).

The field generator 920 generates at least one of a UEP field indicating whether UEP is applied to the subframes, an MCS field indicating the MCS applied to each of the subframes, and a length field indicating the length of each of the subframes. do.

The header generator 930 generates a subframe header including an MCS field and a length field. In addition, the header generator 930 may generate a PHY header including the generated subframe header and the UEP field.

The data frame generator 930 generates a data frame using the subframe header and the subframes. In addition, the data frame generator 930 may generate a data frame using the PHY header and the subframes.

On the other hand, when the data generating device generates a data frame according to an embodiment of the present invention, the ability of the device to receive the data frame should be considered. Thus, in order for the data generating apparatus to know the capability of the receiving apparatus of the data frame, it is possible to receive the capability information frame including information on the capability supported by the receiving apparatus from the receiving apparatus.

10 is a diagram illustrating an embodiment of a capability information frame according to the present invention.

 Referring to FIG. 10, a capability information frame according to an embodiment of the present invention includes an overall capability field 1010, a length field 1020, and a capability information ID 1030.

The global capability field 1010 includes a device capability field 1012 and a PNC capability field 1014.

The device capability field 1012 indicates a capability supported by the receiving apparatus of the data frame, and includes a reservation field 1012a, a UEP supportable field 1012b, and an MCS support data rate field 1012c.

Reserved field 1012a is a field that is left unused for future use.

The UEP supportable field 1012b is a field indicating whether the receiving device is capable of decoding subframes coded with UEP.

The MCS Support Data Rate field 1012c is a field indicating a data rate of the MCS that a receiving apparatus can support to decode a subframe.

The PNC capability field 1014 is a field indicating whether to support the capability as a piconet coordinator.

The length field 1020 is a field indicating the length of the capability information frame.

The capability information ID 1030 is a field indicating an ID for identifying the capability information frame.

The data frame generating apparatus may generate the data frame in consideration of the capability of the apparatus to receive the data frame by receiving the capability information frame from the receiving apparatus to receive the data frame.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.

The computer-readable recording medium may be a magnetic storage medium (for example, a ROM, a floppy disk, a hard disk, etc.), an optical reading medium (for example, a CD-ROM, a DVD, etc.) and a carrier wave (for example, the Internet). Storage medium).

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a diagram illustrating a structure of a general data frame used in a WPAN.

2 is a flowchart illustrating an embodiment of a data frame generation method according to the present invention.

3 is a diagram illustrating an embodiment of a data frame structure according to the present invention.

4 illustrates a second embodiment of a data frame structure according to the present invention.

5 shows a third embodiment of a data frame structure according to the present invention.

6 shows a fourth embodiment of a data frame structure according to the present invention.

7 illustrates a fifth embodiment of a data frame structure according to the present invention.

8 illustrates a sixth embodiment of a data frame structure according to the present invention.

9 is a diagram illustrating an embodiment of a data frame generation apparatus according to the present invention.

10 is a diagram illustrating an embodiment of a capability information frame according to the present invention.

Claims (19)

In the method for generating a data frame, Generating a plurality of subframes using at least one Mac Service Data Unit (MSDU); A UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively Generating at least one field of the length field indicating the length of the; And Generating a data frame using at least one of the UEP field, the MCS field and the length field and the subframes. The method of claim 1, Generating a subframe header including the MCS field and the length field; The generating of the data frame may include generating a data frame using at least one of the UEP field and the subframe header and the subframes. The method of claim 2, Generating a PHY header including the subframe header and the UEP field; The generating of the data frame may include generating a data frame using the PHY header, the MAC header, and the subframes. The method of claim 3, The PHY header is And at least one of a merge information field indicating whether the subframes are aggregated and a subframe number field indicating the number of subframes. The method of claim 2, The generating of the data frame may include generating a data frame including a header group including a PHY header and a MAC header, and a payload including the subframes and the subframe header. And the header group is generated by applying an MCS that yields a lower data rate than the MCS applied to the payload. The method of claim 2, The generating of the data frame may include generating a data frame including the subframe header, a header group including a PHY header and a MAC header, and a payload including the subframes. And the header group is generated by applying an MCS that yields a lower data rate than the MCS applied to the payload. The method of claim 2, The subframe header is And at least one of an MSDU identification field including information for identifying an MSDU used to generate each of the subframes, and a fragmentation information field indicating whether the subframes are fragmented. How to create a data frame. The method of claim 1 Generating the subframes A subframe including only the first type bits and a subframe including only the second type bits using first type bits and second type bits extracted from each of the at least one Mac service data unit (MSDU) Generating a frame, And the first type bits are More Significant Bits (MSB) and the second type bits are Less Significant Bits (LSB). The method of claim 8, Generating the subframes And fragmenting each of the subframe including only the first type bits and the subframe containing only the second type bits. An apparatus for generating a data frame, A subframe generation unit generating a plurality of subframes using at least one Mac service data unit (MSDU); A UEP field indicating whether differential error correction coding (UEP) is applied to the subframes, an MCS field indicating a modulation and coding scheme (MCS) applied to each of the subframes, and the subframes, respectively A field generator for generating at least one field among length fields indicating the length of the field; And And a data frame generator for generating a data frame using at least one of the UEP field, the MCS field, the length field, and the subframes. The method of claim 10, And a header generator configured to generate a subframe header including the MCS field and the length field. The data frame generation unit generates a data frame using at least one of the UEP field and the subframe header and the subframes. The method of claim 11, The header generator generates a PHY header including the subframe header and the UEP field, The data frame generation unit generates a data frame using the PHY header, MAC header and the sub-frames. The method of claim 12, The PHY header is And at least one of a merge information field indicating whether the subframes are aggregated and a subframe number field indicating the number of subframes. The method of claim 11, The data frame generation unit generates a data frame including a header group including a PHY header and a MAC header, and a payload including the subframes and the subframe header. And the header group is generated by applying an MCS that has a lower data rate than an MCS applied to the payload. The method of claim 11, The data frame generation unit generates a data frame including the subframe header, a header group including a PHY header and a MAC header, and a payload including the subframes. And the header group is generated by applying an MCS that has a lower data rate than an MCS applied to the payload. The method of claim 11, The subframe header is And at least one of an MSDU identification field including information for identifying an MSDU used to generate each of the subframes, and a fragmentation information field indicating whether the subframes are fragmented. Data frame generation device. The method of claim 10 The sub frame generation unit A subframe including only the first type bits and a subframe including only the second type bits using first type bits and second type bits extracted from each of the at least one Mac service data unit (MSDU) Create a frame, And the first type bits are More Significant Bits (MSB) and the second type bits are Less Significant Bits (LSB). The method of claim 17, The sub frame generation unit And generating the plurality of subframes by fragmenting each of the subframes including only the first type bits and the subframes including only the second type bits. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 9.

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