TWI385979B - A method of transmitting feedback information using an extended subheader - Google Patents

Description

Method of transmitting feedback information using an extended subheader

The present invention relates to a method of transmitting feedback information, and more particularly to a method of transmitting feedback information using an extended sub-header.

Figure 1 is an illustration of an example of a Media Access Control (MAC) Protocol Data Unit (PDU). As shown in FIG. 1, the MAC management PDU includes a MAC header 11, a management message type 12, and a MAC management load (paylaod) 13. Furthermore, each user uses a bandwidth request PDU to dynamically request a necessary bandwidth for transmission of the uplink data. The bandwidth request PDU is special, including only the bandwidth request header and not including a load.

Figure 2 illustrates a more specific structure of the MAC PDU of Figure 1, if a MAC PDU is formed by not encapsulating or fragmenting a Service Data Unit (SDU), as shown in Figure 2, a MAC PDU does not include a Encapsulate a subheader or a fragmented subheader.

Figure 3 illustrates another embodiment of one of the structures of a MAC PDU. As shown in FIG. 3, a MAC SDU 31 is fragmented to be included in forming two or more MAC PDUs 30a and 30b. In forming the MAC PDUs 30a and 30b, fragmentation sub-headers 34a and 34b are appended to the MAC headers 33a and 33b, respectively. Furthermore, MAC SDUs 35a and 35b are appended to the fragmentation subheaders 34a and 34b, respectively, to form MAC PDUs 30a and 30b.

Figure 4 is another embodiment illustrating the structure of one of the MAC PDUs. In FIG. 4, a MAC PDU is formed by encapsulating two or more MAC SDUs (eg, MAC SDU #1 41a and MAC SDU #2 41b). These MAC SDUs 44 and 46 are appended to the package subheaders 43 and 45, respectively. Here, the MAC PDU has a previous MAC header 42, more specifically before the package subheader 43.

As previously mentioned, when the MAC SDU is fragmented or encapsulated, a fragmented subheader or encapsulation subheader is appended to the individual MAC PDU(s). Therefore, the MAC PDU can be categorized by its individual units and by the number of frames.

In this conventional technique, only methods for fragmentation and packaging can be used. In other words, the conventional technique does not include a MAC PDU structure having one of various extension subheaders.

Accordingly, the present invention is directed to a method of transmitting feedback information using an extended subheader that substantially obviates one or more of the limitations and disadvantages of the related art.

It is an object of the present invention to provide a method of transmitting feedback information.

Another object of the present invention is to provide a method of receiving feedback information.

It is a further object of the present invention to provide a method of transmitting and receiving feedback information.

Additional advantages, objectives, and features of the present invention will be It is to be understood that those skilled in the art will be aware of the following or by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the <RTIgt;

In order to achieve these and other advantages, in accordance with an embodiment of the present invention, as embodied and broadly described herein, a method of transmitting feedback information includes receiving a media access control (MAC) header from a base station (BS). A mobile station (MS) of a protocol data unit (PDU). Then, the MS determines, from the received MAC header, whether an extended sub-header group appears after the MAC header, and also identifies a feedback request extension sub-header from the extended sub-header group. Finally, the MS transmits the feedback information according to the feedback request extension subheader.

In another aspect of the invention, a method of transmitting feedback information includes transmitting a base station (BS) including a protocol data unit (PDU) of a media access control (MAC) header, the MAC header indicating The existence of an extended subheader group. Here the extended sub-header group includes a feedback request extension sub-header. Thereafter, the BS receives feedback information transmitted from the mobile station (MS).

In another aspect of the invention, a system for transmitting and receiving feedback information includes transmitting a base station (BS) including a protocol data unit (PDU) of a media access control (MAC) header, the MAC label The header indicates whether an extended sub-header group appears after the MAC header. Here the extension subheader group indicates a feedback request extension subheader. The system also includes a mobile station (MS) that receives the PDU and subsequently from the MAC header It is determined whether the extension subheader appears after the MAC header. Thereafter, the MS determines from the MAC header whether an extended sub-header group appears after the MAC header. Furthermore, the MS identifies a feedback request extension subheader from the extension subheader group. Finally, the MS transmits the feedback information according to the feedback request extension subheader.

It is to be understood that the foregoing general description of the invention,

Reference will now be made in detail to the preferred embodiments of the invention, Wherever possible, the same reference numerals in the various parts

Figure 5 illustrates an example of a MAC header. As shown in Figure 5, the MAC header includes a 'type' field represented by 6 bits. Furthermore, the 'type' field can represent six different types of sub-headers depending on the bitmap type. These different types of sub-headers can be appended to the MAC header, and a particular type of one of the sub-headers can be indicated in the 'type' field. This type field indicates the six seed header types, and each subheader has a size of 2 bytes.

Table 1 illustrates an example of six types of subheaders.

As shown in Table 1, there are six types of subheaders, represented by a most significant bit (MSB) #5 to a least significant bit (LSB). It can be noted that each subheader type is either present or nonexistent. More specifically, the type of '1' or '0' indicates that the particular subheader is present or absent, respectively.

For example, if the 'type' bit #5 is indicated as '1', then the MAC PDU includes a mesh subheader. That is, each mobile station (MS) is given a Node ID in a grid mode and thus each MS can be identified. In this regard, the grid subheader can be used to provide a Node ID to each MS. If the 'type' bit #4 is indicated to be 1, the MAC PDU includes a sub-header of an automatic repeat request (ARQ). If it is indicated that the 'type' bit #3 is 1, the MAC PDU includes an extended package subheader or a Extend the fragmented subheader. If it is indicated that the 'type' bit #2 and the 'type' bit #1 are 1, respectively, one of the user-packed PDUs is mapped to a MAC SDU load. Furthermore, a MAC PDU can be formed by appending a MAC header and a cyclic redundancy check (CRC).

Finally, the bit application for the 'chain' transmission and the 'type' bit #0 for the next link transmission is different. If the 'type' bit #0 is indicated as '1', then the MAC PDU includes a fast feedback allocation subheader. Here, the fast feedback allocation subheader is placed at the end of all subheaders. To receive a feedback value from the MS, the fast feedback allocation subheader is used to allocate resources and the type of feedback information in a fast feedback channel (eg, channel quality indication channel).

Table 2 shows an example of a fast feedback allocation subheader.

As shown in Table 2, a fast feedback allocation subheader uses a 'distribution offset' to assign a channel quality indication channel (CQICH), which is indicated by a fast feedback channel information item (IE) for transmission. Feedback information. this The allocation of the CQICH can be indicated in a slot. After the MS receives the fast feedback allocation subheader, the MS can use the feedback value to request a change to a multiple input multiple output (MIMO) mode or to a permutation mode.

For an upper link, if the 'type' bit is indicated as '1', the MAC PDU includes a general management subheader. The general management subheader is used to convey information about managing the uplink resource. Furthermore, the use of the general management subheader can be changed depending on the type of a subheader. Depending on the type of service, a bandwidth allocation request uses a piggyback request, a bandwidth stealing scheme, and a polling scheme.

As shown in Figure 5, the MAC header includes two reserved bits, each of which is 1 bit in length. Here, either of the two reserved bits can be used to include information that enhances the fast feedback allocation subheader. In other words, a reserved bit can be used to indicate whether or not to add an enhanced fast feedback allocation subheader.

If it is indicated that the reserved bit is 1, the MAC header includes information about the existence of the enhanced fast feedback allocation subheader, and if the reserved bit is indicated as '0', the MAC header is not Includes any information on the enhanced fast feedback allocation subheader.

Table 3 illustrates an example of an enhanced fast feedback allocation subheader.

According to the third table, the enhanced fast feedback allocation subheader transmits a data packet to the MS. In addition, the enhanced fast feedback allocation subheader requests feedback from the information pertaining to the transmission channel and the weight values of the antenna. Here, additional information may be requested, such as a method of transmitting the feedback information.

In the third table, an 'allocation type' field can be used to select a method of transmitting feedback information. For example, if the 'allocation type' field is indicated as '0', the MS uses the fast feedback channel to transmit the feedback information. In this case, a 'distribution offset' field is used to indicate the fast feedback pass. The location of the track, and a 'CQICH_num' field is used to determine a number of slots that will be used to transmit the feedback information.

In addition, a 'Feedback Type' field is used to indicate the content of the feedback information. For example, if a BS uses two antennas, the BS can request weighting values corresponding to a first antenna and a second antenna when allocating two pages. The MS can then use the allocated page slot to transmit the weighting value of the first antenna and the weighting value of the second antenna.

Furthermore, a 'frame offset' field can be used to provide information as to when the MS should transmit the feedback information. That is, after the MS receives the sub-header, the MS may transmit the feedback information after a specific period or a specific number of frames.

Alternatively, if the 'allocation type' field is indicated as '1', the MS uses the MAC header to transmit the feedback information. Here, a 'duration' field is used to provide information about the radio resources allocated in the upper link, and a 'feedback type' is used to indicate the type of feedback information.

Table 4 is an example of feedback information describing the value of the 'Feedback Type' field.

As described above, if the 'allocation type' field is indicated as '1', the MS receives the enhanced fast feedback allocation sub-header and uses the allocated uplink radio resource to transmit the feedback information through the MAC header. .

Figure 6 is a diagram illustrating another embodiment of a MAC header. As shown in FIG. 6, the MAC header includes an Extended Subheader Format (ESF) field to further represent an extended subheader group. That is, if the ESF field value is set to '1', an extended sub-header group is provided between the MAC header and the six types of sub-headers (directly after the MAC header). And represented by a 'type' field. Alternatively, the extended sub-header group may appear between the sub-header and a load. Thereafter, an 'extend subheader' term can be used interchangeably with an 'extend subheader group' term.

Figure 7 depicts an example of a MAC PDU. As shown in this figure, the MAC PDU includes a MAC header 71, an ESF 72, a subheader 73, a payload 74, and a CRC 75. The ESF 72 can be located in the MAC header 71 and the subheader 73, the length of the ESF 72 can be determined based on a number of additional subheaders.

The BS may set the value of the ESF field to '1' in the MAC header so that the MAC may be notified that the ESF exists between the MAC header and the sub-header. Furthermore, the ESF should not be encrypted; however, the MS can perform the error detection operation by using a CRC located at the end of the PDU.

Figure 8 is a diagram depicting the structure of one of the extended sub-header groups. As shown in FIG. 8, the extended sub-header group is provided by an extended sub-header length field 81, a reserved bit field 82, and one for providing the total length of one of the extended sub-headers. The extended subheader type field 83 and an extended subheader are composed of 84 pieces. Preferably, the extension sub-header length field is represented by 8 bits, and the total length of the extension sub-header is represented by a byte. Here the total length can be represented by up to 2 ⁷ bytes. Furthermore, there can be up to 82 types of extension subheaders.

Table 5 is an example of an extended subheader type.

Here, Table 5 illustrates the addition of the two extension subheaders. That is, according to the extended sub-header type field 83, a type corresponding to '0' has an extended sub-header_1 having a length of one (1) byte, and a type corresponding to '1' There is an extended subheader _2 of length two (2) bytes. Depending on the type, the extension subheader can be classified according to whether the subheader is used for upper or lower link transmission. For example, a subheader for the upper link is formed at the MS and transmitted to the BS, and if the MS receives the subheader, the MS ignores it.

Figure 9 is an example of a format of an ESG. Refer to Figures 7 and 8 and Table 2 here. In Figure 9, the MAC PDU includes the extended sub-header group, and an extended sub-header length field 91 is used to indicate a total length of the sub-header. In this figure, the total length of the subheader is six (6) bytes.

In particular, a new extension subheader_1 includes a reserved bit 92 and an extended subheader type 93. Here the extension subheader type is '0' and has a length equal to 1 byte. Again, one of the extended sub-headers 94 contains information represented by the type '0' and having a length of one sub-header of one byte.

Furthermore, a new extension subheader_2 includes a reserved bit 95 and an extended subheader type 96. Here, the extension subheader type is '1' and the length is 2 bytes. In a text 97 of the extension subheader_2, unlike the new extension subheader_1, it has two subheaders of length 2 bytes.

Table 6 is an example of attaching to the link extension subheader of one of the MAC PDUs.

As shown in the sixth table, at least one sub-header is attached to the MAC PDU before being transmitted. For example, if the ESF type field indicates a '00000010', a 3-bit feedback request extension sub-header is attached to the MAC PDU.

Table 7 is another example of attaching a chain extension subheader group to one of the MAC PDUs.

As shown in the seventh table, at least one sub-header is attached to the MAC PDU before being transmitted. For example, if there is a MIMO mode change request, a MIMO mode feedback extension sub-header is transmitted after selecting a desired mode.

The eighth table is an example of a feedback sub-header format derived from a feedback request header of an upper link extension subheader.

As shown in Table 8, a feedback request extension subheader format can be a length of 3 bytes. If the feedback request extension sub-header format is transmitted to the MS, the MS uses the allocated uplink radio resource to transmit the feedback information according to the content of the feedback request extension sub-header. In addition, an 'OFDMA Symbol Offset' field and a 'Subchannel Offset' field provide a location for the link resource above the feedback information. Furthermore, a 'number of page slots' field indicates a number of page slots allocated for the burst transfer or a number of page slots used from a specified location. Here, one of the methods of encoding the feedback information is determined using an upper link interval usage code (UIUC). Finally, a 'frame offset' field provides a start frame for transmitting feedback information, wherein the start frame is a frame in which the feedback information is initially transmitted.

It will be apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention. Therefore, the present invention should Modifications and variations are within the scope of the appended claims and their equivalents.

11‧‧‧Media Access Control (MAC) header

12‧‧‧Management message types

13‧‧‧MAC management load

30a, 30b‧‧‧MAC Agreement Data Unit (PDU)

31,32a,32b,35a,35b,41a,41b,44,46‧‧‧MAC Service Data Unit (SDU)

33a, 33b, 42, 71‧‧‧ MAC header

34a, 34b‧‧‧ fragmented subheaders

43,45‧‧‧Package subheader

72‧‧‧Extended Subheader Format (ESF)

73‧‧‧Subheader

74‧‧‧load

75‧‧‧Cyclic Redundancy Check (CRC)

81,91‧‧‧Extension subheader length field

82,92,95‧‧‧Reserved bit field

83,93,96‧‧‧Extension subheader type field

84,94,97‧‧‧Extension subheader

The accompanying drawings are included to provide a further understanding of the invention, and 1 is an example of a structure of a media access control (MAC) protocol data unit (PDU); FIG. 2 illustrates a structure of a MAC PDU of FIG. 1; and FIG. 3 illustrates a structure of a MAC PDU. Another example of FIG. 4 is another example of a structure of a MAC PDU; FIG. 5 illustrates an example of a MAC header; FIG. 6 illustrates another example of a MAC header; An example of a MAC PDU is depicted; FIG. 8 is a diagram depicting the structure of one of the extended sub-header groups; and FIG. 9 is an example of an extended sub-header format (ESF).

71‧‧‧MAC header

72‧‧‧ESF

73‧‧‧Subheader

74‧‧‧load

75‧‧‧CRC

Claims (22)

A method for transmitting feedback information, the method comprising at least the following steps: a receiving step of receiving a media access control from a base station (BS) by a mobile station (MS) (Medium Access Control, MAC) header of a Protocol Data Unit (PDU), the MAC header includes: a type field and an Extended Subheader Format (ESF) field, The type field indicates which sub-headers are attached to the PDU, the ESF field indicates whether an extended sub-header group exists; the determining step, the determining step determines, by the MS, the extended sub-header according to the ESF field Whether the group exists in the PDU; the identifying step, the identifying step is based on the extension sub-header group identifying a feedback request extension sub-header; and the transmitting step, the transmitting step is returned to the feedback request extension sub-header The feedback information, wherein the extended sub-header group appears immediately after the MAC header and before all sub-headers. The method of claim 1, wherein the extended sub-header group further comprises at least one of the following: a Service Data Unit Sequence Number (SDU_SN) extension sub-header, a chain (Down Link, DL) sleep control extension subheader, The Sequence Number (SN) requests an extension subheader, a PDU SN (short) extension subheader, and a PDU SN (long) extension subheader. The method of claim 2, wherein one of the ESF fields is 1 bit in size, and one of the types of fields is 6 bits in size. The method of claim 2, wherein the extended sub-header group further comprises: an extended sub-header length field, at least one extended sub-header type field, and at least one extended sub-header. Bit. The method of claim 4, wherein the extension sub-header group length field indicates a total length of one of the extension sub-header groups; the at least one extension sub-header type field indicates various types of Extending the subheader; and the field of the at least one extended subheader includes: the content of each of the extended subheaders. The method of claim 5, wherein the size of one of the fields of the extension subheader is dependent on the content of each of the extension subheaders. The method of claim 2, wherein the feedback is The request extension subheader includes: a feedback type field, a frame offset field, a subchannel offset field, an orthogonal frequency partitioned multiplex access (OFDMA) symbol offset field, and an upper link interval. Use the code (UIUC) field and several page slot fields. The method of claim 7, wherein the feedback type field comprises at least one of: a lower link average carrier interference noise ratio (CINR), and a preferred lower link interval coding (DIUC). . The method of claim 7, wherein the frame offset field indicates a start frame for transmitting feedback information, and the start frame is a frame where the feedback information is to be transmitted. . The method of claim 2, wherein the feedback information is transmitted through a feedback MAC header. The method of claim 2, wherein the feedback request extension subheader further comprises: an allocation type indicating that the feedback information is transmitted by using a fast feedback channel or a feedback MAC header, and The feedback information is transmitted through the fast feedback channel. A method of receiving feedback information, the method comprising at least the following Step: a construction step of constructing a PDU at a BS, the PDU comprising: a MAC header, wherein the MAC header includes: a type field and an ESF field, the type field indicating which sub-label a header is appended to the PDU, the ESF field indicating whether an extended sub-header group exists; and a transmitting step of transmitting, by the BS, the PDU, the PDU comprising: the MAC header, by the type field At least one of the sub-headers indicated, and the extended sub-header group, wherein the extended sub-header group includes: a feedback request extension sub-header; and a receiving step, the receiving step is back to the feedback request extension The sub-header receives the feedback information. The method of claim 12, wherein the extended sub-header group further comprises at least one of: an SDU_SN extension sub-header, a DL sleep control extension sub-header, and an SN request extension sub-header. , a PDU SN (short) extension subheader and a PDU SN (long) extension subheader. The method of claim 13, wherein one of the ESF fields is 1 bit in size, and one of the types of fields is 6 bits in size. The method of claim 13, wherein the extension sub-header group comprises: an extension sub-header group length field, the extension The sub-header group length field indicates a total length of one of the extended sub-header groups, at least one extended sub-header type field, and the at least one extended sub-header type field indicates various types of extended sub-headers. And at least one extended sub-header field, the at least one extended sub-header field includes: the content of each of the extended sub-headers. The method of claim 13, wherein the feedback request extension subheader comprises: a feedback type field, a frame offset field, a subchannel offset field, and an orthogonal frequency partition multiplex The (OFDMA) symbol offset field, the upper link interval use code (UIUC) field, and several page slot fields. The method of claim 13, wherein the feedback information is received via a feedback MAC header. A system for transmitting and receiving feedback information, the system comprising: a base station (BS) configured to: construct a PDU, the PDU includes: a MAC header, wherein the MAC header includes: a type field and An ESF field, the type field indicating which sub-headers are attached to the PDU, the ESF field indicating whether an extended sub-header group exists; transmitting the PDU, the PDU containing: the MAC header, by This type At least one of the sub-headers indicated by the field, and the extended sub-header group, wherein the extended sub-header group includes: a feedback request extension sub-header; and the feedback request extension sub-header is received The feedback information; and a mobile station (MS) is configured to: receive the PDU, the PDU includes: the MAC header; determine, according to the ESF field, whether the extended sub-header group exists in the PDU; The extended sub-header group identifies a feedback request extension sub-header; and the feedback request extension extension sub-header transmits the feedback information, wherein the extended sub-header group then appears after the MAC header and all sub-labels Before the head. The system of claim 18, wherein the extended sub-header group further comprises at least one of: an SDU_SN extension sub-header, a DL sleep control extension sub-header, an SN request extension sub-header, A PDU SN (short) extension subheader and a PDU SN (long) extension subheader. The system of claim 19, wherein one of the ESF fields is 1 bit in size and one of the types of fields is 6 bits in size. For example, the system described in claim 20, wherein the extension The subheader group includes an extension subheader length field, at least one extension subheader type field, and at least one extension subheader. The system of claim 20, wherein the extension sub-header group length field indicates a total length of one of the extension sub-header groups; the at least one extension sub-header type field indicates various types of Extending the subheader; and the field of the at least one extended subheader includes: the content of each of the extended subheaders.