CN101414894A - Method and apparatus for generating down frame prefix - Google Patents
Method and apparatus for generating down frame prefix Download PDFInfo
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- CN101414894A CN101414894A CNA2007101813752A CN200710181375A CN101414894A CN 101414894 A CN101414894 A CN 101414894A CN A2007101813752 A CNA2007101813752 A CN A2007101813752A CN 200710181375 A CN200710181375 A CN 200710181375A CN 101414894 A CN101414894 A CN 101414894A
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Abstract
The invention discloses a generating method of downlink frame prefix, which comprises the following steps of: in information field of downlink frame prefix, choosing decoding indication information used for generating verifying information; according to the decoding indication information, generating the verifying information used for the error correcting of frame control head FCH decoding; and filling the verifying information into reserved field of the downlink frame prefix. The invention also discloses a downlink frame prefix generating device. The application of the downlink frame prefix generated by the invention can improve the accuracy of the FCH decoding.
Description
Technical field
The present invention relates to the downlink sub-channels distribution technique, particularly a kind of generation method and apparatus of downlink frame prefix.
Background technology
Insert in (OFDMA, Orthogonal Frequency Division Multiple Access) application in the OFDM under time division multiplexing (TDD, the Time Division Duplex) pattern, network equipment sends downlink frame to terminal.Fig. 1 is the topology example figure of OFDMA frame under the tdd mode.In frame structure shown in Figure 1, ordinate is represented subchannel, abscissa is represented symbol, arrange in order from start-up portion, comprise in this frame: preamble (Preamble), frame control head (FCH, FrameControl Header), down link bitmap (DL-MAP, Down Link Map) message and up link bitmap (UL-MAP, Up Link Map) message, wherein, FCH and DL-MAP message are the important component part of downlink frame.
Wherein, DL-MAP message is used to indicate the situation of down link, carry downlink frame prefix (DL_Frame_Prefix) among the FCH, it is the data structure that the beginning of each downlink frame all sends, its structure as shown in Table 1, comprise information field and reserved field, what wherein carry in the information field is the decoding indication information that is used to indicate the DL-MAP source codec, above-mentioned decoding indication information comprises: the bitmap (Used subchannel bitmap) that has used subchannel, repeated encoding indication (Repetition_Codeing_Indication), coding indication (Coding_Indication) and DL-MAP message-length (DL-MAP_Length) amount to 19 bits; And reserved field is 5 bits, generally is changed to 0.
Used the bitmap of subchannel, totally 6 bits are used to indicate the situation of chooser channel group, and the distribution situation of groups of subchannels as shown in Table 2.The corresponding groups of subchannels of each bit, value are that to represent to select this groups of subchannels, value at 1 o'clock be to represent not select this groups of subchannels at 0 o'clock.
Repeated encoding is indicated, and is used to indicate the repeated encoding mode of DL-MAP message use, and repeated encoding can be 0 (not repeating), 1 (increasing by 1 repetition), 2 (increasing by 3 repetitions), 3 (increasing by 5 repetitions).
The coding indication is used to indicate DL-MAP message to use forward error correction (FEC, Forword ErrorCorrect) coding.
The DL-MAP message-length is used to define the length that is right after the DL-MAP message after downlink frame prefix, the application of repetition coded, is unit with slot.
Above-mentioned downlink frame prefix need be mapped on the FCH, is sent to terminal by network equipment.During OFDMA under tdd mode used, downlink sub-channels is distributed and comprised following two kinds of methods of salary distribution: part was used subchannel (PUSC, Partial usage of subchannels) mode, promptly had only the parton channel allocation to give transmitter; All use subchannel (FUSC, Full usage of subchannels) mode, promptly all subchannels are distributed to transmitter.Wherein under the PUSC mode, FCH uses Quadrature Phase Shift Keying (QPSK, Quadrature Phase Shift Keying) modulation in the PUSC district, 1/2 code check and 4 times of repetitive mode emissions, adopt compulsory encoding scheme, promptly FCH sends having on 4 subchannels of continuous logic Sub-Channel Number.Terminal need be decoded to FCH after receiving FCH, could obtain to be used in the downlink frame prefix indicate the decoding indication information of DL-MAP source codec, thereby the DL-MAP message in the downlink frame is correctly decoded, and obtains the situation of down link.
Table one
| Project | Size | Note |
| DL_Frame_Prefix_Format(){ | ||
| Used subchannel bitmap | 6 bits | Bit#0：Subchannel Group 0 Bit#1： |
| Reserved | 1 bit | Put 0 |
| Repetition_Coding_Indication | 2 bits | No repeated encoding 01:DL-MAP uses 2 times of repeated encoding 10:DL-MAP to use 4 times of repeated encodings among the 00:DL-MAP |
| 11:DL-MAP uses 6 times of repeated encodings | ||
| Coding_Indication | 3 bits | 0b000:DL-MAP uses CC coding 0b001:DL-MAP to use BTC coding 0b010:DL-MAP to use CTC coding 0b011:DL-MAP to use ZT CC coding 0b100:DL-MAP to use the optional CC coding 0b101:DL-MAP that interweaves to use LDPC coding 0b110to0b111-to keep |
| DL-Map_Length | 8 bits | |
| reserved | 4 bits | Put 0 |
| } |
Table two
As seen, terminal must be carried out correct decoding to FCH, just can obtain to be used to indicate in the information field of downlink frame prefix the decoding indication information of DL-MAP source codec, thereby correctly to the DL-MAP source codec, and then obtain the situation of down link by the content of DL-MAP message.Therefore the decoding correctness of FCH is extremely important, but according to the regulation of existing protocol, FCH only is to use 1/2 coding, the QPSK modulation, and from the result of product feedback, the decoding correctness of FCH is still waiting to improve.
Summary of the invention
The embodiment of the invention provides a kind of generation method of downlink frame prefix, uses the downlink frame prefix of this method generation, can improve the decoding correctness of FCH.
The embodiment of the invention provides a kind of downlink frame prefix generating device, uses the downlink frame prefix of this device generation, can improve the decoding correctness of FCH.
The technical scheme of the embodiment of the invention is achieved in that
A kind of generation method of downlink frame prefix, this method comprises:
In the information field of downlink frame prefix, select to be used to generate the decoding indication information of check information;
According to described decoding indication information, generate the check information that is used for frame control head FCH decoding and error;
Described check information is inserted in the reserved field of downlink frame prefix.
A kind of downlink frame prefix generating device, this device comprises:
The check information module is used for the information field at downlink frame prefix, selects to be used to generate the check information decoding indication information; According to described decoding indication information, generate the check information that is used for the FCH decoding and error;
Executive Module is used for being used for check information to the FCH decoding and error with what described check information module generated, inserts in the reserved field of downlink frame prefix.
As seen, the downlink frame prefix that the embodiment of the invention provides generates method and apparatus, in the information field of downlink frame prefix, selection is used to generate the decoding indication information of check information, according to described decoding indication information, generate the check information that is used for the FCH decoding and error, be filled up to the reserved field of downlink frame prefix, therefore can error correction when FCH decode, improve the correctness that FCH decodes.
Description of drawings
Fig. 1 is the topology example figure of frame during OFDMA uses under the tdd mode in the prior art;
Fig. 2 is the flow chart of embodiment of the invention downlink frame prefix generation method;
Fig. 3 is the structural representation of embodiment of the invention downlink frame prefix generating apparatus.
Embodiment
For the advantage and the purpose that make the embodiment of the invention is clearer, the embodiment of the invention is described in further detail below in conjunction with accompanying drawing.
Fig. 2 generates method flow diagram for the downlink frame prefix that the embodiment of the invention provides, and this flow process comprises:
Step 201: in the information field of downlink frame prefix, select to be used to generate the decoding indication information of check information.
In this step, the structure of downlink frame prefix, the information field that comprises reserved field and carry the decoding indication information that is used to indicate the DL-MAP source codec, wherein, the decoding indication information in the information field can comprise the coding indication of repeated encoding indication, DL-MAP message of the bitmap that used subchannel, DL-MAP message and DL-MAP message-length etc.
In information field, select to be used to generate the decoding indication information of check information, promptly can select the part or all of decoding indication information of carrying in the information field.
Step 202:, generate the check information that is used for the FCH decoding and error according to described decoding indication information.
In this step,, selected decoding indication information in the step 201 according to certain rule, is generated the check information that is used for the FCH decoding and error according to application need.
Suppose the whole decoding indication information composition set u in the information field, the different decoding indication information of being carried are the element in this set, and then the decoding indication information in the information field can be expressed as: u={u
1u
2... u
n.
Suppose that again described rule represents that with F then the check information that is used for decoding and error of Sheng Chenging can be expressed as: p=F (w), wherein
Be that w can comprise part or all element among the u.
Step 203: the check information that generates is inserted in the reserved field of downlink frame prefix.
In this step, the check information that generates can take the reserved field in all or part of downlink frame prefix, if take the part reserved field, remaining reserved field can be filled in other information according to concrete needs, for example can fill in the relevant indication information of decoding.
By above-mentioned steps, can generate the downlink frame prefix of the embodiment of the invention.
In the generation method of the downlink frame prefix that the embodiment of the invention provides, in the information field of downlink frame prefix, selection is used to generate the decoding indication information of check information, according to described decoding indication information, generation is used for the check information to the FCH decoding and error, be filled up to the reserved field of downlink frame prefix, therefore can error correction when FCH decode, thus improve the correctness that FCH decodes.
Be example with concrete application scenarios below, introduce the better embodiment of the downlink frame prefix generation method that several embodiment of the invention provide.
At first briefly introduce the linear block codes related content.
Block code can be expressed as [nk], is generally used for forward error correction, and k represents information bit, n indication code group length, and n-k represents check digit, and when the information bit code element in the block code and the pass between the check digit code element were linear relationship, block code was called linear block codes.In the Linear Block Codes, above-mentioned check digit code element is by the part or all of generation of information bit code element.
Introduction in conjunction with above-mentioned linear block codes, in the better embodiment of embodiment of the invention method, generation be used for to the check information of FCH decoding and error can for: at information field, selection is used to generate the decoding indication information of check information, according to described decoding indication information, generate linear block codes.The check digit code element that is generated in the linear block codes is a check information.In addition, the decoding indication information in the information field of information bit code element corresponding selection.
Linear block codes can also use generator matrix to represent.
For example, (n k), supposes that generator matrix is G=[I for linear block codes
kQ], wherein G is k * n matrix, I
KBe k * k unit matrix, Q is the matrix of k * (n-k), and then linear block codes can adopt following formulate: C=mG, and wherein m is the matrix that the information bit code element is formed.
Method better embodiment one
Information field in the downlink frame prefix is 19 bits, and the decoding indication information in the information field comprises: 6 bits have used the bitmap of subchannel, the repeated encoding indication of 2 bit DL-MAP message, the coding indication and the 8 bit DL-MAP message-lengths of 3 bit DL-MAP message; Reserved field in the downlink frame prefix is 5 bits.Use in this better embodiment of set expression, the information field of downlink frame prefix is expressed as u={u
1u
2... u
19.
Linear block codes in this better embodiment, for adopting the decoding indication information in whole 19 bit information fields, [24 of generation, 19] linear block codes, 5 bit check digit code elements in this linear block codes, 5 bits in corresponding this better embodiment are used for the check information to the FCH decoding and error.
The generator matrix of [24,19] linear block codes can be expressed as: G=[I
kQ].Wherein G is 19 * 24 matrixes, I
KBe 19 * 19 unit matrixs, Q is 19 * 5 matrixes, and then [24,19] linear block codes can adopt following formulate: C=uG.
Above-mentioned C can be expressed as the structure shown in the table three, wherein in the 19 bit information fields, loaded information is the 6 bits bitmap that used subchannel, the repeated encoding indication of 2 bit DL-MAP message, the coding indication and the 8 bit DL-MAP message-lengths of 3 bit DL-MAP message; It in the 5 bit reserved fields the check information of being used for of 5 bits to the FCH decoding and error.
Table three
| 19 bit information fields (beared information) | 5 bit reserved fields (check information) |
In existing 802.16 evolution agreement, the method that the 16e+ terminal can use the embodiment of the invention to provide to after the FCH decoding, can also use check information in the reserved field to come the further error correction of decoding to FCH, thereby when guaranteeing compatibility, improved the correctness of FCH decoding.
Method preferred embodiment two
In downlink frame prefix, the subchannels bitmap information of having used, the repeated encoding indication information of DL-MAP message, coding indication information be totally 11 bits, in general be constant, and the DL-MAP message-length of 8 bits is often to change, so decoding and error can be primarily aimed at the DL-MAP message-length.
Use the set mode to represent the DL-MAP message-length of 8 bits, can be expressed as: u={u
1u
2... u
8.
In this better embodiment, consider only to use the DL-MAP message-length of 8 bits, generate [13,8] linear block codes, 5 bit check digit code elements in this linear block codes are for 5 bits in this better embodiment are used for check information to the FCH decoding and error.
The generator matrix of [13,8] linear block codes is: G=[I
kQ].Wherein G is 8 * 13 matrixes, I
KBe 8 * 8 unit matrixs, Q is 8 * 5 matrixes, and then [13,8] linear block codes can adopt following formulate: C=uG.
Above-mentioned C can be expressed as the structure shown in the table four, and wherein in the 8 bit information fields, loaded information is 8 bit DL-MAP message-lengths; It in the 5 bit reserved fields the check information of being used for of 5 bits to the FCH decoding and error.
Table four
| 8 bit information fields (carrying DL-MAP length) | 5 bit reserved fields (check information) |
In the evolution agreement of existing 802.16e agreement, the method that the 16e+ terminal just can use the embodiment of the invention to provide, after to the FCH decoding, can also use check information in the reserved field to come the further error correction of decoding to FCH, thereby when guaranteeing compatibility, improved the correctness of FCH decoding.
Method preferred embodiment three
In downlink frame prefix, the subchannels bitmap information of having used, the repeated encoding indication information of DL-MAP message, coding indication information be totally 11 bits, in general be constant, perhaps only in superframe this 11 bit just may change, and the DL-MAP message-length of 8 bits is often to change, so decoding and error can be at the DL-MAP message-length.
Simultaneously, based on These characteristics, a kind of preferred implementation can be proposed on decoding process, promptly the DL-MAP message-length is adopted every frame FCH decoding renewal method once, and, in a FCH superframe, adopt the method for the soft merging decoding of continuous multiple frames FCH to not labile 11 bits, according to well known to a person skilled in the art content, the method of soft merging decoding can make at the decoding of 11 bits comparatively easy in conjunction with decoded frame information like this.
Under above-mentioned preferable decoding process, can use 1 bit in the 5 bit reserved fields as indication information, be used to refer to above-mentioned not labile 11 bits and whether change, and if do not have to change could with the soft merging decoding of existing 11 bit informations of the FCH of previous frame.For example, adopt above-mentioned not labile 11 bits of 0 indication that variation has taken place, adopt normal decoding process this moment, adopt above-mentioned not labile 11 bits of 1 indication not change, then can use and the soft merging decoding of existing 11 bit informations of the FCH of previous frame.Consider a kind of special circumstances, what promptly current need were decoded is first frame, and can't compare this moment with previous frame, can insert the value of indication normal decoder in this case in above-mentioned indication information.In first frame, should in 1 bit in the above-mentioned 5 bit reserved fields, fill in 0, adopt the normal decoder mode when guaranteeing to first frame decoding.
Be used in generation aspect the check information of FCH decoding and error,, can be expressed as: u={u if use the set mode to represent the DL-MAP message-length of 8 bits
1u
2... u
8.
In this better embodiment, adopt the DL-MAP message-length of 8 bits, generate [12,8] grouping linear code, 4 bit check digit code elements of this linear block codes, 4 bits in corresponding this better embodiment are used for the check information to the FCH decoding and error, are carried in the reserved field in 4 bits except that above-mentioned indicating bit.
The generator matrix of [12,8] linear block codes is: G=[I
kQ].Wherein G is 8 * 12 matrixes, I
KBe 8 * 8 unit matrixs, Q is 8 * 4 matrixes, and then [12,8] linear block codes can adopt following formulate: C=uG.
In the evolution agreement of existing 802.16e, the method that the 16e+ terminal can use the embodiment of the invention to provide to after the FCH decoding, can also use check information in the reserved field to come the further error correction of decoding to FCH, thereby when guaranteeing compatibility, improved the correctness of FCH decoding.
Be understandable that, the preferred embodiment one of said method is to preferred embodiment three, concrete decoding indication information, number of bits to information field carrying in the downlink frame prefix, and to the description of the number of bits that generates check information, be a kind of the giving an example under the concrete application scenarios, under different application scenarioss, these concrete contents can be different.
The structural representation of the downlink frame prefix generating apparatus that Fig. 3 provides for the embodiment of the invention, this device comprises:
The check information module is used for the information field at downlink frame prefix, selects to be used to generate the decoding indication information of check information; According to described decoding indication information, generate the check information that is used for the FCH decoding and error.
Executive Module is used for the check information with described check information module generation, inserts in the reserved field of downlink frame prefix.
In the downlink frame prefix generating apparatus that the embodiment of the invention provides, in the information field of downlink frame prefix, selection is used to generate the decoding indication information of check information, according to described decoding indication information, generation is used for the check information to the FCH decoding and error, be filled up to the reserved field of downlink frame prefix, therefore can error correction when FCH decode, thus improve the correctness that FCH decodes.
Above-mentioned check information module can comprise: linear block codes generation module and check information generation module.
The linear block codes generation module is used for the information field at downlink frame prefix, selects all or part of decoding indication information, generates linear block codes.Comprise information bit and check digit code element in the linear block codes that generates.
The check information read module is used for reading the check digit code element of the linear block codes that described linear block codes generation module generates, and with this check digit code element as the check information that is used for the FCH decoding and error.
In the downlink frame prefix generating apparatus that the embodiment of the invention provides, can further include: the indication information generation module, be used for removing the position of inserting check information at the reserved field of downlink frame prefix, insert indication information, described indication information is used for when described linear block codes generation module is selected the partial decoding of h indication information, if present frame is not first frame, indication other decoding indication information except that the decoding indication information of selecting, whether change with comparing of FCH carrying in the previous frame, for example when the decoding indication information of the DL-MAP message of selecting is the DL-MAP message-length, can use the bitmap that uses subchannel in this indicating bit indicating downlink frame prefix information field, whether the repeated encoding indication of DL-MAP message and the coding indication of DL-MAP message change with comparing of FCH carrying in the previous frame; If present frame is first frame, indication other decoding indication information except that the decoding indication information of selecting adopt the normal decoder mode.
The downlink frame prefix generating device that the embodiment of the invention provides, the generation method work of the downlink frame prefix that can provide according to the embodiment of the invention.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of generation method of downlink frame prefix is characterized in that, this method comprises:
In the information field of downlink frame prefix, select to be used to generate the decoding indication information of check information;
According to described decoding indication information, generate the check information that is used for frame control head FCH decoding and error;
Described check information is inserted in the reserved field of downlink frame prefix.
2, the method for claim 1 is characterized in that, and is described in the information field of downlink frame prefix, and the decoding indication information of selecting to be used for to generate check information is: at the downlink frame prefix information field, select all or part of decoding indication information.
3, method as claimed in claim 1 or 2, it is characterized in that, described generation is used for the check information of FCH decoding and error: generate linear block codes, with the check digit code element of the linear block codes that generates, as the described check information that is used for the FCH decoding and error.
4, method as claimed in claim 3 is characterized in that, described decoding indication information comprises: used the bitmap of subchannel, the repeated encoding indication of down link bitmap DL-MAP message, the coding indication and the DL-MAP message-length of DL-MAP message.
5, method as claimed in claim 3 is characterized in that, described decoding indication information is: the DL-MAP message-length; Described being used for takies whole described reserved fields to the check information of FCH decoding and error.
6, method as claimed in claim 3 is characterized in that, described decoding indication information is: the DL-MAP message-length;
Described being used for takies the described reserved field of part to the check information of FCH decoding and error, also comprises indication information in the described reserved field;
If present frame is not first frame, whether described indication information is used for indicating other decoding indication information except that described DL-MAP message-length to change with comparing of previous frame FCH carrying; If present frame is first frame, described indication information is used to indicate other decoding indication information except that described DL-MAP message-length to adopt the normal decoder mode.
7, method as claimed in claim 6 is characterized in that, not comparing of FCH carrying changes in described other decoding indication information and the previous frame, when FCH decode, adopts soft merging to decode to described other decoding indication information.
8, a kind of downlink frame prefix generating device is characterized in that, this device comprises:
The check information module is used for the information field at downlink frame prefix, selects to be used to generate the decoding indication information of check information; According to described decoding indication information, generate the check information that is used for the FCH decoding and error;
Executive Module is used for being used for check information to the FCH decoding and error with what described check information module generated, inserts in the reserved field of downlink frame prefix.
9, device as claimed in claim 8 is characterized in that, described check information module comprises:
The linear block codes generation module is used for the information field at downlink frame prefix, selects all or part of decoding indication information, generates the linear block codes that comprises the check digit code element;
The check information read module is used for reading the check digit code element of the described linear block codes that described linear block codes generation module generates, as the check information that is used for the FCH decoding and error.
10, device as claimed in claim 9, it is characterized in that, further comprise in this device: the indication information generation module, be used for reserved field at downlink frame prefix except that the position of inserting described check information, insert indication information, described indication information is used for when described linear block codes generation module is selected the partial decoding of h indication information, if present frame is not first frame, whether indication changes except that comparing of carrying of FCH in other decoding indication information of the decoding indication information of selecting and the previous frame, if present frame is first frame, indication other decoding indication information except that the decoding indication information of selecting adopt the normal decoder mode.
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|---|---|---|---|
| CNA2007101813752A CN101414894A (en) | 2007-10-19 | 2007-10-19 | Method and apparatus for generating down frame prefix |
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|---|---|---|---|
| CNA2007101813752A CN101414894A (en) | 2007-10-19 | 2007-10-19 | Method and apparatus for generating down frame prefix |
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Open date: 20090422 |