CN101364990A - Method for reducing data header expense - Google Patents
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- CN101364990A CN101364990A CN 200710075706 CN200710075706A CN101364990A CN 101364990 A CN101364990 A CN 101364990A CN 200710075706 CN200710075706 CN 200710075706 CN 200710075706 A CN200710075706 A CN 200710075706A CN 101364990 A CN101364990 A CN 101364990A
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- segmentation
- rlc pdu
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- data head
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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Abstract
The embodiment of the invention relates to the mobile communication field, in particular to a method for reducing the expenditure of a data head. The embodiment of the invention indicates the position of an RLC PDU segment in the original RLC PDU through the format of the data head of an expanded RLC PDU, and determines domains which can be omitted in the data head of the RLC PDU segment according to the position, thereby reducing the expenditure of the data head.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of method that reduces data header expense.
Background technology
LTE (Long Term Evolution, Long Term Evolution) project is primarily aimed at the 3GPP tissue and prepares the mobile communication architectural framework of promotion in the period of following 10, E-UTRAN (Evolved UniversalTerrestrial Radio Access Network, the UMTS Terrestrial radio access network of evolution), it is a cover system framework that carries out evolution on current 3G standard.
Fig. 1 is the schematic diagram of E-UTRAN system in the prior art.As shown in Figure 1, the E-UTRAN system is made up of core net gateway, base station and subscriber equipment.
Fig. 2 is the user plane protocol configuration diagram of E-UTRAN system in the prior art.As shown in Figure 2, from top to bottom each layer is respectively: PDCP (Packet Data Convergence Protocol, the packet data convergence layer), RLC (Radio Link Control, wireless chain control layer), MAC (Medium Access Control, media access control layer) and PHY (Physical Layer, physical layer).
Fig. 3 is the user plane protocol interlayer packing manner schematic diagram of E-UTRAN system in the prior art.As shown in Figure 3, rlc layer can be packed to the SDU (Service DataUnit, Service Data Unit) that the PDCP layer is sent, and adds data head information, and the PDU (Protocol Data Unit, protocol Data Unit) that generates is sent to the MAC layer.The RLC PDU that the MAC layer can be sent rlc layer packs as MAC SDU, adds data head information, and the PDU that generates is sent to lower floor.
Fig. 4 is a RLC PDU data format schematic diagram in the prior art.The implication in each territory of the PDU of RLC shown in Fig. 4, and corresponding expense is as shown in table 1.
Table 1
| Be called for short | Full name | Implication | Expense |
| D/C | Data/control (Data/Control) | Indicating this segmentation is data message or control information | 1 |
| T | Type (Type) | Indicating this segmentation is original RLC PDU or RLC PDU segmentation | 1 |
| P | Poll bit (Polling Bit) | The status report of request receiving terminal | 1 |
| SN | Sequence number (Sequence Number) | The sequence number of RLC PDU under this segmentation | 11 |
| SI | Segmentation indication (Segment Indicator) | Whether the head and tail of indication RLC PDU is segmentation | 2 |
| LI | Length Indication (Length Indicator) | Indication RLC SDU or the length of SDU segmentation in PDU | 11 |
| E | Extended bit (Extension Bit) | The indication back is length field or data | 1 |
RLC PDU when Fig. 5 retransmits for rlc layer support in the prior art is cut apart schematic diagram.When RLCPDU transmits when making a mistake for the first time, transmitting terminal will retransmit this RLC PDU, if when the channel condition of eating dishes without rice or wine is not enough to transmit this RLC PDU, transmitting terminal will send after will heavily cutting apart this RLC PDU again.As shown in Figure 5, because bust this, RLC PDU is divided into five segmentations (#1-#5) through heavily cutting apart for the first time; After the bust this, transmitting terminal is selected that RLCPDU is heavily cut apart the segmentation 1 and the segmentation 5 that obtain for the first time and is carried out heavily cutting apart second time, produces segmentation #1, segmentation #2 and segmentation #3, the segmentation #4 of correspondence respectively again in RLC PDU segmentation.
Fig. 6 is the data format schematic diagram of RLC PDU segmentation in the prior art.The implication in each territory of the segmentation of RLCPDU shown in Fig. 6, and corresponding expense is as shown in table 2.
Table 2
| Be called for short | Full name | Implication | Expense |
| D/C | Data/control (Data/Control) | Indicating this segmentation is data message or control information | 1 |
| T | Type (Type) | Indicating this segmentation is original RLC PDU or RLC PDU segmentation | 1 |
| P | Poll bit (Polling Bit) | The status report of request receiving terminal | 1 |
| SN | Sequence number (Sequence Number) | The sequence number of RLC PDU under this segmentation | 11 |
| LSF | Last segmentation markers (Last Segment Flag) | Indicate whether this segmentation is the last segmentation of original PDU | 1 |
| LF | Section length (Length Field) | Indicate the length of this segment data | 15 |
| SO | Grading excursion (Segment Offset) | Indicate the position of this segmentation in original RLC PDU | 15 |
As shown in Table 2, the data head of RLC PDU segmentation can indicate transmitting terminal to retransmit which RLCPDU segmentation.Simultaneously, LF territory that defines in the data head form and SO territory are used for identifying the data length of this RLCPDU segmentation respectively, and the position in original RLC PDU.In the prior art, the expense in LF territory and SO territory is 15 bits.
If the data header expense of original RLC PDU is the x bit, this original RLC PDU produces n RLC PDU segmentation (n〉1) after overweight cutting apart, and so, the data header expense summation of heavily cutting apart a said n RLCPDU segmentation that obtains is the n*x bit.That is to say, compare that the data header expense of a said n RLC PDU segmentation has increased (n-1) * x bit with the data header expense of original RLC PDU, wherein, x〉42 (SN territories+LF territory+SO territory+LSF territory).
By above-mentioned disclosed technical scheme as can be known, the major defect of prior art existence is: original RLCPDU has increased the data header expense of a large amount of RLC PDU segmentation after overweight cutting apart, thereby causes the reduction of data transmission efficiency.
Summary of the invention
The embodiment of the invention provides a kind of method that reduces data header expense.This method may further comprise the steps:
(method exclusive rights)
By such scheme as can be known, the embodiment of the invention is by the RLC PDU segment data position of form indication RLC PDU segmentation in original RLC PDU of expansion, and determine according to this position in the data head of RLCPDU segmentation can the territory, abridged, thereby reduces the expense of data head.
Description of drawings
Fig. 1 is an E-UTRAN system schematic in the prior art;
Fig. 2 is the user plane protocol configuration diagram of E-UTRAN system in the prior art;
Fig. 3 is the user plane protocol interlayer packing manner schematic diagram of E-UTRAN system in the prior art;
RLC PDU data format schematic diagram in Fig. 4 prior art;
RLC PDU when the rlc layer support retransmits in Fig. 5 prior art is cut apart schematic diagram;
The data format schematic diagram of RLC PDU segmentation in Fig. 6 prior art;
Fig. 7 is heavily cut apart the data format schematic diagram of back segmentation #1 for the first time for the RLC PDU of the embodiment of the invention one;
Fig. 8 is heavily cut apart the data format schematic diagram of back segmentation #1 for the first time for the RLC PDU of the embodiment of the invention three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention is that example describes with RLC PDU partitioning scheme shown in Figure 5 still.
In the embodiment of the invention, the LSF territory by 1 bit of the prior art, is expanded to 2 bits, be used for indicating and heavily cut apart the RLC PDU segmentation that obtains position at original RLC PDU.When the LSF territory indicates this RLC PDU to be segmented into first segmentation of RLC PDU, because being 0 byte from original data, first segmented general begins, therefore can omit the SO territory.
Data message in the LSF territory can be as shown in table 3 with the corresponding relation of indication implication.
Table 3
| Data message in the LSF territory | This RLC PDU segmentation position in original RLC PDU |
| 00 | Non-first segmentation or |
| 01 | First segmentation |
| 10 | Last segmentation |
| 11 | Reserve |
As shown in Figure 7, the data format schematic diagram of heavily cutting apart segmentation #1 in back for the RLC PDU of the embodiment of the invention one for the first time.As original RLC PDU, and after it was carried out heavily cutting apart the first time, the segmentation #1 that obtains was first segmentation of original RLC PDU with this RLC PDU, and therefore, the LSF territory content in the data head of this segmentation is 01.Simultaneously, this segmentation is from 0 byte of initial data, and Fragment Offset is 0, therefore, can omit the SO territory in the data head of this segmentation.In the present embodiment, omit the SO territory in the data head of segmentation #1, promptly reduced the expense of 15 bits, and the expansion in LSF territory has only brought the increase of 1 bit.Therefore, compare through heavily cutting apart the RLC PDU segment data header overhead that is produced for the first time with original RLC PDU in the prior art, the above-mentioned data header expense in the present embodiment reduces by 14 bits altogether.
In the embodiment of the invention two, the segmentation #1 of the RLC PDU that a last embodiment is obtained carries out heavily cutting apart the second time, the segmentation #1 that obtains remains first segmentation of original RLC PDU, therefore, LSF territory content in the data head of this segmentation is 01, simultaneously, can omit the SO territory, the content in LF territory changes according to the variation of section length.In addition, heavily cut apart for the second time and also obtain segmentation #2, because this segmentation is positioned at original RLC PDU middle part, therefore, the LSF territory content in its data head is 00, and not having can the territory, abridged, and the content in LF territory and sSO territory changes according to the variation of section length and side-play amount.
The embodiment of the invention can also be, adds the first segmentation markers FSF (First Segment Flag) territory in the RLC PDU segment data head in the prior art, and expense is 1 bit.This FSF territory is used for indicating cuts apart heavily whether the RLC PDU segmentation that obtains is first segmentation of original RLC PDU.When the LSF territory indicates this RLC PDU to be segmented into first segmentation of RLC PDU, because being 0 byte from original data, first segmented general begins, therefore can omit the SO territory.
Data message in the FSF territory can be as shown in table 4 with the corresponding relation of indication implication.
Table 4
| Data message in the FSF territory | This RLC PDU segmentation position in original RLC PDU |
| 0 | Non-first segmentation |
| 1 | First segmentation |
As shown in Figure 8, the data format schematic diagram of heavily cutting apart segmentation #1 in back for the RLC PDU of the embodiment of the invention three for the first time.As original RLC PDU, and after it was carried out heavily cutting apart the first time, the segmentation #1 that obtains was first segmentation of original RLC PDU with this RLC PDU, and therefore, the FSF territory content in the data head of this segmentation is 1.Simultaneously, this segmentation is from 0 byte of initial data, and Fragment Offset is 0, therefore, can omit the SO territory in the data head of this segmentation.In the present embodiment, omit the SO territory in the data head of segmentation #1, promptly reduced the expense of 15 bits, and the increase that 1 bit is only brought in the FSF territory of adding.Therefore, compare through heavily cutting apart the RLC PDU segment data header overhead that is produced for the first time with original RLC PDU in the prior art, the above-mentioned data header expense in the present embodiment reduces by 14 bits altogether.In the embodiment of the invention four, the segmentation #1 of the RLC PDU that a last embodiment is obtained carries out heavily cutting apart the second time, the segmentation #1 that obtains remains first segmentation of original RLC PDU, therefore, FSF territory content in the data head of this segmentation is 1, simultaneously, can omit the SO territory, the content in LF territory changes according to the variation of section length.In addition, heavily cut apart for the second time and also obtain segmentation #2, because this segmentation is positioned at original RLC PDU middle part, therefore, the FSF territory content in its data head is 0, and not having can the territory, abridged, and the content in LF territory and SO territory changes according to the variation of section length and side-play amount.
As shown from the above technical solution, the position of RLC PDU segmentation in original RLC PDU segmentation that obtains heavily cut apart in the data head indication of the RLC PDU of embodiment of the invention utilization expansion, thereby can be according to the position of segmentation, omit unnecessary territory in the segment data head, reduce the expense of data head, improve data transmission efficiency.
It below only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a method that reduces data header expense is characterized in that, may further comprise the steps:
The data head form of the protocol Data Unit PDU segmentation of extended wireless controlling links layer RLC;
Described RLC PDU or RLC PDU segmentation are heavily cut apart;
According to the data head form after the described expansion, for data head is added in the described heavy RLC PDU segmentation of cutting apart generation;
According to the indicated content of described data head, omit corresponding territory in the data head form of described RLC PDU segmentation.
2. method according to claim 1 is characterized in that,
LSF territory in the expansion RLC PDU segment data form, the LSF territory after the described expansion is used to indicate the position relation of described RLC PDU segmentation and original RLC PDU.
3. method according to claim 2 is characterized in that,
The position relation of described RLC PDU segmentation and described original RLC PDU comprises following three kinds:
Described RLC PDU segmentation is first segmentation among the described original RLC PDU;
Described RLC PDU segmentation is the last segmentation among the described original RLC PDU;
Described RLC PDU segmentation is among the described original RLC PDU, the arbitrary segmentation except that first segmentation and last segmentation.
4. method according to claim 3 is characterized in that,
When described RLC PDU segmentation is first segmentation among the described original RLC PDU, can omit grading excursion SO territory in the data head of described RLCPDU segmentation.
5. according to arbitrary described method among the claim 1-4, it is characterized in that,
Last segmentation markers LSF territory in the data head form of described RLC PDU segmentation is expanded to 2 bits.
6. method according to claim 1 is characterized in that,
In the data head form of described RLC PDU segmentation, add the first segmentation markers FSF territory.
7. method according to claim 6 is characterized in that,
The expense in described FSF territory is 1 bit.
8. according to claim 6 or 7 described methods, it is characterized in that,
Described FSF territory is used to indicate the position relation of described RLC PDU segmentation and original RLC PDU.
9. method according to claim 8 is characterized in that,
The position relation of described RLC PDU segmentation and described original RLC PDU comprises following two kinds:
Described RLC PDU segmentation is first segmentation among the described original RLC PDU;
Described RLC PDU segmentation is among the described original RLC PDU, the arbitrary segmentation except that first segmentation.
10. method according to claim 9 is characterized in that,
When described RLC PDU segmentation is first segmentation among the described original RLC PDU, can omit grading excursion SO territory in the data head of described RLCPDU segmentation.
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| CN 200710075706 CN101364990B (en) | 2007-08-08 | 2007-08-08 | Method for reducing data header expense |
| PCT/CN2008/071930 WO2009018786A1 (en) | 2007-08-08 | 2008-08-07 | A method and system for reducing overhead of data header |
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| CN 200710075706 CN101364990B (en) | 2007-08-08 | 2007-08-08 | Method for reducing data header expense |
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| CN101364990B CN101364990B (en) | 2012-06-27 |
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| WO2015139238A1 (en) * | 2014-03-19 | 2015-09-24 | 华为技术有限公司 | Data processing method and apparatus |
| CN106664312A (en) * | 2016-11-04 | 2017-05-10 | 北京小米移动软件有限公司 | Protocol data unit (PDU) pack generation method and apparatus |
| CN107889163A (en) * | 2016-09-30 | 2018-04-06 | 华为技术有限公司 | Data processing method, apparatus and system |
| WO2018068310A1 (en) * | 2016-10-14 | 2018-04-19 | 富士通株式会社 | Data processing method and device, and communications system |
| CN108632326A (en) * | 2017-03-24 | 2018-10-09 | 电信科学技术研究院 | A kind of method and device of protocol data unit communication data |
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| Publication number | Publication date |
|---|---|
| CN101364990B (en) | 2012-06-27 |
| WO2009018786A1 (en) | 2009-02-12 |
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