CN101471924A - Method and apparatus for indicating data packet head - Google Patents

Method and apparatus for indicating data packet head Download PDF

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Publication number
CN101471924A
CN101471924A CNA2007103014504A CN200710301450A CN101471924A CN 101471924 A CN101471924 A CN 101471924A CN A2007103014504 A CNA2007103014504 A CN A2007103014504A CN 200710301450 A CN200710301450 A CN 200710301450A CN 101471924 A CN101471924 A CN 101471924A
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China
Prior art keywords
crc
mac frame
field
indication field
size
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CNA2007103014504A
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Chinese (zh)
Inventor
余荣道
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNA2007103014504A priority Critical patent/CN101471924A/en
Priority to PCT/CN2008/073792 priority patent/WO2009082974A1/en
Publication of CN101471924A publication Critical patent/CN101471924A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)
  • Error Detection And Correction (AREA)

Abstract

The invention discloses an indicating method of a data header, which comprises the following steps: a sending terminal device determines and generates a corresponding CRC indicator field according to the length of a protocol data unit PDU of a media access control MAC frame; the sending terminal device sends the MAC frame carried with the CRC indicator field to a receiving terminal device; and the receiving terminal device carries out corresponding CRC check. The invention further discloses a cyclic redundancy check device. The embodiment of the invention provides a flexible universal MAC header structure which can flexibly select a CRC byte according to a PDU byte, such as CRC8, CRC16, CRC24, CRC32 and the like, thereby reducing the cost, further satisfying the optimization of an MAC layer in an 802.16e plus system and reducing the cost demands of the MAC layer.

Description

A kind of data packet head indicating means and equipment
Technical field
The present invention relates to communication technical field, relate in particular to a kind of data packet head indicating means and equipment.
Background technology
802.16e MAC (Medium Access Control, the medium access control) PDU (ProtocolData Unit, protocol Data Unit) form as shown in Figure 1, each PDU comprises the versatile MAC frame head of a regular length, is MAC PDU payload after the versatile MAC frame head; Payload comprises 0 or a plurality of sub-packet header, 0 or a plurality of MAC SDU (Service Data Unit, service data unit) and/or their segmentation.Payload information length is variable, so MAC PDU also can represent elongated byte stream, makes the MAC layer need not to know the form and the bit arrangement of message, and the pass-through channel of various high-level business types only is provided.
At the MAC layer, the versatile MAC frame head comprises descending mac frame head, comprises MAC administrative messag or CS data later at frame head.The MAC layer has defined two UL (up link) MAC administrative messag form, and first is the descending mac frame head that the versatile MAC frame head is arranged, and comprises MAC administrative messag or CS data later at frame head, and wherein HT is arranged to 0; Second is the mac frame head form that does not comprise payload, and wherein HT is arranged to 1.Mac layer frame head formal definition such as table 1,
Table 1:
Grammer Size (bit) Note
MAC Header(){
HT 1 0=versatile MAC layer frame head 1=bandwidth request frame head
EC
1 If HT=1, then EC=0
if(HT＝0){
Type 6
Keep 1 Should be changed to 0
CI 1
EKS 2
Keep 1 Should be changed to 0
LEN 11
}
else{
Type 3
BR 19
}
CID 16
HCS 8
}
When HT=0 represents the versatile MAC frame head, type field (type) is totally 6 bits, its implication such as table 2:
Table 2:
Bit Value
#5 most significant bit (MSB) The sub-packet header 1=of MESH exists, and 0=does not exist
#4 ARQ feedback payload 1=exists, and 0=does not exist
#3 Expansion type is for the connection of not using ARQ, if be expanded, this bit indicates whether to exist packing or divides cross-talk packet header to be used for the connection that non-ARQ activates.Not expansion of 1=expansion 0=.For the connection of using ARQ, this bit will be arranged to 1.
#2 Divide cross-talk packet header
1=exists, and 0=does not exist
#1 The sub-packet header 1=that packs exists, and 0=does not exist
#0 least significant bit(LSB) Down link: the quick sub-packet header of feedback allocation up link: the sub-packet header 1=of empowerment management exists, and 0=does not exist
In addition, also provide an a kind of expansion form (Extended subheader format) in the system, expanded sub-packet header group such as Fig. 2,
Expand sub-packet header group and start from 8 bit length field, and carry the sub-packet header of one or more expansions.Length field has defined the byte length of this sub-packet header group, has comprised all and has expanded sub-packet header and length byte.Each is expanded sub-packet header and comprises reservation bit, one 7 bit expanded sub-packet header type field and the sub-packet header of single variable length extensions main body.Each expands the size in sub-packet header by the expansion word frame head type decided in the table 3.
Table 3:
Title Length (bits) Describe
Extended subheader group length 8 Expand sub-packet header group length field and indicated the total length of sub-packet header group, comprised all and expanded sub-packet header and length byte.
Reserved 1 Reserved=0
Extended subheader type 7 The sub-packet header type of definition in table 1.
Extended subheaderbody Variable In table 1 the sub-packet header of the expansion type decided of definition expand the length in sub-packet header.This size of expanding sub-packet header main body is with byte count.
The sub-packet header of table 4 expansion set type is described (DL)
The ES type Title The ES size Describe
0 SDU_SN extended subheader 1
1 DL Sleep control extended subheader 3
2 Feedback request extended subheader 3
3 SN request extended subheader 1
4 PDU SN(short) extended subheader 1
5 PDU SN(long) extended subheader 2
6-127 Reserved
Versatile MAC frame head form comprises as shown in Figure 2: HT, 1 byte, expression frame head type; EC, 1 byte, control is encrypted in expression, is payload not to be encrypted in 0 o'clock, is payload to be encrypted in 1 o'clock; Type, 6 bytes are represented sub-packet header and the type that is present in the appointment payload in the message payload; ESF, 1 byte, expression expansion territory, sub-packet header, if ESF=0 expands sub-packet header and does not exist, if the sub-packet header of expansion will appear in ESF=1, and immediately following GMH; CI, 1 byte, expression CRC (Cyclic RedundancyCheck, cyclic redundancy check (CRC)) indicating device is that 1 o'clock CRC is comprised among the PDU, appends to after the PDU payload, encrypt if desired, after encrypting, again it is appended to the PDU payload after, be not comprise the CRC function at 0 o'clock; EKS, 2 bytes, the expression encryption key sequence, the index of traffic encryption keys (tek) and initial vector will be used to payload and encrypt, and this field only is arranged to 1 just effectively in the EC field; Rsv, 1 byte, expression keeps the position; LEN, 11 bytes are represented length, refer to comprise the MAC PDU length with byte representation of MAC head and CRC check (if existence); CID, 16 bytes, expression connection identifier (CID; HCS, 8 bytes, expression frame head checking sequence, one 8 bit field is used for the error detection of frame head, and transmitting terminal will calculate the HCS value of preceding 5 bytes of cell frame head, and the result is inserted into HCS field (being the last byte of mac frame head), the computational methods of HCS are as follows: the frame head except that the HCS field multiply by D8, removes (mould 2) and obtains remainder and be HCS with generator polynomial g (D)=D8+D2+D+1, for example: [HT EC Type]=0x80, BR=0xAAAA, CID=0x0F0F; HCS should be set as 0xD5.
Each frame head is encoded, from frame head type HT field and encryption control EC field.The coding of these fields should be followed: first byte of mac frame head can not equal 0xFX (X represents any value), surveys with the flase drop of the byte of padding that prevents from Transmission Convergence Sub-layer is used.A server data stream can add a cyclic redundancy check (CRC) in each the MAC PDU for these data flow carrying data.In this case, for each MAC PDU of frame head type=0, cyclic redundancy check (CRC) 32 can be added on the payload of MACPDU, and it is unshielded promptly asking MAC PDU.Cyclic redundancy check (CRC) must cover the payload of versatile MAC frame head and MAC PDU.Cyclic redundancy check (CRC) must calculate after encryption, and promptly cyclic redundancy check (CRC) is protected the payload of general frame head and encryption.
Above-mentioned CRC adopts 32 CRC, and 32 rank standard generator polynomials below CRC32 will use are calculated:
G(x)＝x 32+x 26+x 23+x 22+x 16+x 12+x 11+x 10+x 8+x 7+x 5+x 4+x 2+x+1
In realizing process of the present invention, find to have following defective in the prior art: in the versatile MAC frame head, field Len is 11 bits, and what indication comprised MAC head and CRC check (if existence) is the MAC PDU length of unit with the byte, so be the 2^11=2048 byte to the maximum.So whole M AC PDU excursion is very large, and only adopt fixing CRC32 in the existing protocol,, can cause unnecessary spending like this for less PDU.
Summary of the invention
The embodiment of the invention provides a kind of data packet head indicating means and equipment, to save unnecessary spending in the redundant cyclic check.
The embodiment of the invention provides a kind of data packet head indicating means, may further comprise the steps:
Sending ending equipment determines to generate corresponding C RC indication field according to media access control MAC frame protocol Data Unit PDU length;
The mac frame that described sending ending equipment will carry described CRC indication field sends to receiving device, carries out the CRC check of corresponding size for described receiving device.
The embodiment of the invention also provides a kind of data packet head indicating means, may further comprise the steps:
Receiving device receives the mac frame that carries the CRC indication field from sending ending equipment, and described CRC indication field is determined to generate according to PDU length;
Described receiving device uses the CRC of corresponding size that described mac frame is carried out verification according to described indication field
The embodiment of the invention also provides a kind of sending ending equipment, comprising:
The CRC indication field is provided with the unit, is used for media access control MAC frame protocol Data Unit PDU length and determines to generate corresponding C RC indication field;
Transmitting element, the mac frame that is used for carrying described CRC indication field sends to receiving device, carries out the CRC check of corresponding size for described receiving device.
The embodiment of the invention also provides a kind of receiving device, comprising:
Receiving element is used to receive mac frame, comprises the indication field of CRC size in the described mac frame head, and described CRC indication field is determined to generate according to PDU length;
Verification unit is used for using the CRC of corresponding size that described mac frame is carried out verification according to described indication field.
In the embodiments of the invention, provide a kind of header structure of versatile MAC flexibly, can select the size of CRC neatly according to the size of PDU, as CRC8, CRC16, CRC24, CRC32 etc., thus expense reduced, and then satisfy the demand of the expense of MAC layer optimization in the 802.16e+ system, minimizing MAC layer.
Description of drawings
Fig. 1 is a MAC layer PDU form schematic diagram in the prior art;
Fig. 2 is the sub-packet header of an expansion group form schematic diagram in the prior art;
Fig. 3 is a versatile MAC frame head form schematic diagram in the prior art;
Fig. 4 is a kind of data packet head indicating means flow chart in the embodiment of the invention;
Fig. 5 is a kind of data packet head indication mechanism structure chart in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of data packet head indicating means, as shown in Figure 3, may further comprise the steps:
Step s301, sending ending equipment determines to generate corresponding C RC indication field according to protocol Data Unit PDU length in the media access control MAC frame.In existing versatile MAC head, field CI is the indication of CRC, and CI=1 represents to adopt CRC, and CRC=0 represents not comprise the CRC function; Field Rsv is a reserved field, need not in 802.16e.The embodiment of the invention amounts to the field Rsv of the field CI of 1 bit and 1 bit to 2 bits and combines, and indicates its CRC size that adopts according to different PDU sizes, and basic principle is that the size of CRC is directly proportional with the size of PDU, and promptly PDU is big more, and CRC is big more.The desirable CRC0 of CRC size usually, CRC8, CRC12, CRC16, CRC24, CRC32.Wherein CRCn represents to adopt the CRC of n position.The CI of 2 bits and Rsv are desirable as shown in table 5:
Table 5:
CI Rsv
0 0
0 1
1 0
1 1
The CRC size that adopted of CI field and Rsv field joint instructions wherein.The CRC size can be selected according to the size of PDU, the desirable CRC0 of CRC size typically, and CRC8, CRC12, CRC16, CRC24, CRC32, shown in table 6,7,8:
Table 6:
CI Rsv CRC
0 0 0
0 1 CRC 8
1 0 CRC 32
1 1 CRC 16
Table 7:
CI Rsv CRC
0 0 0
0 1 CRC 8
1 0 CRC 32
1 1 CRC 24
Table 8:
CI Rsv CRC
0 0 0
0 1 CRC 12
1 0 CRC 32
1 1 CRC 24
Wherein, the following generator polynomial of CRC 32 usefulness is calculated: g CRC32(x)=x 32+ x 26+ x 23+ x 22+ x 16+ x 12+ x 11+ x 10+ x 8+ x 7+ x 5+ x 4+ x 2+ x+1
CRC24 adopts following generator polynomial to calculate: g CRC24(x)=x 24+ x 23+ x 6+ x 5+ x+1
CRC16 adopts following generator polynomial to calculate; g CRC16(x)=x 16+ x 12+ x 5+ 1
CRC12 adopts following generator polynomial to calculate; g CRC12(x)=x 12+ x 11+ x 3+ x 2+ x+1
CRC8 adopts following generator polynomial to calculate; g CRC8(x)=x 8+ x 7+ x 4+ x 3+ x+1
Step s302, the mac frame that sending ending equipment will carry described CRC indication field sends to receiving device.
Step s303, receiving device receives mac frame, comprises the indication field of CRC size in the described mac frame head, and uses the CRC of corresponding size that described mac frame is carried out verification according to described indication field.Generally, terminal need be carried out capability negotiation with the base station when initialization.
In addition, in existing 802.16e agreement, field Rsv is a reserved field, and its value puts 0.Therefore in existing 802.16e, the CRC of the CI of 2 bits and the value of Rsv and its indication is as shown in table 9:
Table 9:
CI Rsv CRC
0 0 CRC 0
1 0 CRC 32
In order to guarantee compatibility, promptly the 802.16+ terminal can be in the 802.16e system operate as normal, therefore in 802.16e+, 00 still indicates CRC 0,10 still to indicate CRC32 when CI field and Rsv field joint instructions.01, the 11 CRC size that can indicate other flexibly is as CRC 8, CRC12, CRC16, CRC24.
In the embodiment of the invention, can also use the CI field in the versatile MAC head to indicate whether to use variable CRC head
CI=1 uses variable CRC head, otherwise does not use variable CRC head.
Variable CRC head is as table 10,
Table 10:
Syntax Size(bit) Note's
Variable CRC Subheader{
CI 2 00-CRC12 01-CRC16 10-CRC24 11-CRC32
reserved 6
}
In the embodiment of the invention, can also define a kind of sub-head of variable C RC size by the sub-head of expansion, as shown in table 11,
Table 11:
The ES type Title The ES size Describe
0 SDU_SN extended subheader 1
1 DL Sleep control extended subheader 3
2 Feedback request extended subheader 3
3 SN request extended subheader 1
4 PDU SN(short) extended 1
subheader
5 PDU SN(long)extended subheader 2
6 Variable CRC extended subheader 1
7-127 Reserved
In the embodiment of the invention two, adopting CRC32 is that example describes,
Sending ending equipment determines that according to the CRC indication field in the mac frame head CRC size is CRC 32, and generates corresponding CRC 32 fields.Detailed process comprises: get complement code for initial 32, just be equivalent to the initial value of CRC register is made as 0xFFFFFFFF; First word bit of first field (MSB of first byte in MAC packet header) is corresponding to X N-1, last word bit of last field is corresponding to X 0, wherein n is the word bit number of input traffic; With X 32Multiply each other the deconv that obtains with G (x); Remainder is got benefit by word bit; 32 word bits of crc value are placed in the crc field, like this X 31Just become the Far Left word bit of first byte, and X 0It is exactly the rightmost word bit of last byte; The crc field that generates sends MSB earlier.
Receiving device receives and carries the mac frame of crc field, according to the indication field of the CRC size in this mac frame head, uses the CRC32 of corresponding size that described mac frame is carried out verification.Detailed process comprises: the remainder initial value all is preset as 1, the input byte with MSB for being fed to crc engine earlier; When being removed by G (x), multinomial has a unique non-zero remainder, does not produce error of transmission so, and this unique remainder values is a multinomial:
x 31+x 30+x 26+x 25+x 24+x 18+x 15+x 14+x 12+x 11+x 10+x 8+x 6+x 5+x 4+x 3+x+1
The embodiment of the invention also provides a kind of data packet head indication mechanism, as shown in Figure 4, comprises sending ending equipment 100 and receiving device 200.
Wherein, sending ending equipment 100 specifically comprises: the CRC indication field is provided with unit 110, is used for determining to generate corresponding C RC indication field according to media access control MAC frame protocol Data Unit PDU length; Transmitting element 120, the mac frame that is used for carrying described CRC indication field sends to receiving device, carries out the CRC check of corresponding size for described receiving device.Negotiation element 130 is used for consulting whether have the ability of using multiple CRC size with described receiver equipment.Wherein, the CRC indication field combines setting by CRC indicator field CI with reserved field Rsv.
Receiving device 200 comprises: receiving element 210, be used to receive mac frame, and comprise the indication field of CRC size in the described mac frame head, described CRC indication field is determined to generate according to PDU length; Verification unit 220 is used for using the CRC of corresponding size that described mac frame is carried out verification according to described indication field; Negotiation element 230 is used for consulting whether have the ability of using multiple CRC size with described transmit leg equipment.
The embodiment of the invention provides a kind of header structure of versatile MAC flexibly, makes it the size according to PDU, selects the size of CRC neatly, as CRC8, and CRC16, CRC24, CRC32 etc., thus reduce expense.And then satisfy MAC layer in 802.16e+ system optimization, reduce the demand of the expense of MAC layer.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims (10)

1, a kind of data packet head indicating means is characterized in that, may further comprise the steps:
Sending ending equipment determines to generate corresponding C RC indication field according to media access control MAC frame protocol Data Unit PDU length;
The mac frame that described sending ending equipment will carry described CRC indication field sends to receiving device, carries out the CRC check of corresponding size for described receiving device.
2, data packet head indicating means according to claim 1 is characterized in that, described CRC indication field combines setting by CRC indicator field CI with reserved field Rsv; Or
Indicate whether to use variable CRC head by the CI field in the versatile MAC head; Or
The sub-head of variable C RC size is set by the son head of expansion.
3, as data packet head indicating means method as described in the claim 2, it is characterized in that, described CI field be 0 and Rsv be 0 o'clock, adopt CRC0; Described CI field be 1 and Rsv be 0 o'clock, adopt CRC32.
As data packet head indicating means method as described in the claim 2, it is characterized in that 4, the size of described CRC head is directly proportional with the protocol Data Unit PDU length in the mac frame.
5, a kind of data packet head indicating means is characterized in that, may further comprise the steps:
Receiving device receives the mac frame that carries the CRC indication field from sending ending equipment, and described CRC indication field is determined to generate according to PDU length;
Described receiving device uses the CRC of corresponding size that described mac frame is carried out verification according to described indication field.
6, as data packet head indicating means as described in the claim 5, it is characterized in that, also comprise before the described reception mac frame:
Consult whether have the ability of using multiple CRC size with described transmit leg equipment.
7, a kind of sending ending equipment is characterized in that, comprising:
The CRC indication field is provided with the unit, is used for determining to generate corresponding C RC indication field according to mac frame PDU length;
Transmitting element, the mac frame that is used for carrying described CRC indication field sends to receiving device, carries out the CRC check of corresponding size for described receiving device.
As sending ending equipment as described in the claim 7, it is characterized in that 8, described CRC indication field combines setting by CRC indicator field CI with reserved field Rsv.
9, a kind of receiving device is characterized in that, comprising:
Receiving element is used to receive mac frame, comprises the indication field of CRC size in the described mac frame head, and described CRC indication field is determined to generate according to PDU length;
Verification unit is used for using the CRC of corresponding size that described mac frame is carried out verification according to described indication field.
10, as receiving device as described in the claim 9, it is characterized in that, also comprise:
Negotiation element is used for consulting whether have the ability of using multiple CRC size with described transmit leg equipment.
CNA2007103014504A 2007-12-27 2007-12-27 Method and apparatus for indicating data packet head Pending CN101471924A (en)

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