Method for reducing data header expense

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0028] The embodiment of the present invention still uses Figure 5 The illustrated RLC PDU segmentation method is taken as an example for description.

[0029] In the embodiment of the present invention, the LSF field is expanded from 1 bit in the prior art to 2 bits, which is used to indicate the position of the RLC PDU segment obtained by re-segmentation in the original RLC PDU. When the LSF field indicates that the RLC PDU segment is the first segment of the RLC PDU, since the first segment always starts from the 0 byte of the original data, the SO field can be omitted.

[0030] The corresponding relationship between the data information in the LSF domain and the meaning of the indication may be as shown in Table 3.

[0031] table 3

[0032] Data information in the LSF domain The position of the RLC PDU segment in the original RLC PDU 00 Non-first segment or non-last segment 01 First segment 10 Last segment 11 Reserved

[0033] Such as Figure 7 As shown, it is a schematic diagram of the data format of segment #1 after the first re-segmentation of the RLC PDU in the first embodiment of the present invention. After taking this RLC PDU as the original RLC PDU and re-segmenting it for the first time, the obtained segment #1 is the first segment of the original RLC PDU. Therefore, the content of the LSF field in the data header of this segment is 01. At the same time, the segment starts from byte 0 of the original data, and the segment offset is 0. Therefore, the SO field can be omitted from the data header of the segment. In this embodiment, the SO field is omitted from the data header of segment #1, that is, the overhead of 15 bits is reduced, while the extension of the LSF field only brings an increase of 1 bit. Therefore, compared with the RLC PDU segment data header overhead generated by the first re-segmentation of the original RLC PDU in the prior art, the above data header overhead in this embodiment is reduced by 14 bits in total.

[0034] In the second embodiment of the present invention, the segment #1 of the RLC PDU obtained in the previous embodiment is re-segmented for the second time, and the obtained segment #1 is still the first segment of the original RLC PDU. Therefore, the segment #1 is still the first segment of the original RLC PDU. The content of the LSF field in the data header of the segment is 01. At the same time, the SO field can be omitted, and the content of the LF field changes according to the change of the segment length. In addition, the second re-segmentation also obtains segment #2. Since this segment is located in the middle of the original RLC PDU, the content of the LSF field in the data header is 00, and there are no fields that can be omitted, the content of the LF field and the sSO field. Change according to the change of segment length and offset.

[0035] In the embodiment of the present invention, a first segment flag FSF (First Segment Flag) field may be added to the RLC PDU segment data header in the prior art, and the overhead is 1 bit. The FSF field is used to indicate whether the RLC PDU segment obtained by re-segmentation is the first segment in the original RLC PDU. When the LSF field indicates that the RLC PDU segment is the first segment of the RLC PDU, since the first segment always starts from the 0 byte of the original data, the SO field can be omitted.

[0036] The corresponding relationship between the data information in the FSF field and the meaning of the indication may be as shown in Table 4.

[0037] Table 4

[0038] Data information in the FSF domain The position of the RLC PDU segment in the original RLC PDU 0 Non-first segment 1 First segment

[0039] Such as Figure 8 As shown, it is a schematic diagram of the data format of segment #1 after the first re-segmentation of the RLC PDU in the third embodiment of the present invention. After taking this RLC PDU as the original RLC PDU and re-segmenting it for the first time, the obtained segment #1 is the first segment of the original RLC PDU. Therefore, the content of the FSF field in the data header of this segment is 1. At the same time, the segment starts from byte 0 of the original data, and the segment offset is 0. Therefore, the SO field can be omitted from the data header of the segment. In this embodiment, the SO field is omitted from the data header of segment #1, that is, the overhead of 15 bits is reduced, while the added FSF field only brings an increase of 1 bit. Therefore, compared with the RLC PDU segment data header overhead generated by the first re-segmentation of the original RLC PDU in the prior art, the above data header overhead in this embodiment is reduced by 14 bits in total. In the fourth embodiment of the present invention, the segment #1 of the RLC PDU obtained in the previous embodiment is re-segmented for the second time, and the obtained segment #1 is still the first segment of the original RLC PDU. Therefore, the segment #1 is still the first segment of the original RLC PDU. The content of the FSF field in the data header of the segment is 1. At the same time, the SO field can be omitted, and the content of the LF field changes according to the change of the segment length. In addition, the second re-segmentation also obtains segment #2. Since this segment is located in the middle of the original RLC PDU, the FSF field content in the data header is 0, and there are no fields that can be omitted, the LF field and the SO field. Change according to the change of segment length and offset.

[0040] It can be seen from the above technical solution that the embodiment of the present invention uses the extended RLC PDU data header to indicate the position of the re-segmented RLC PDU segment in the original RLC PDU segment, so that the segment data header can be omitted according to the position of the segment. In unnecessary fields, reduce the overhead of the data header and improve the efficiency of data transmission.

[0041] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as The scope of protection of the present invention.