Method and apparatus for code block division

Abstract

A method and apparatus for code block division are provided. The method may include the following acts. A reference information block length of a code block is determined according to an obtained division related parameter. A maximum information block length is determined according to the reference information block length and a hardware parameter. A Transport Block (TB) having a length greater than the maximum information block length may be divided into two or more code blocks according to the obtained division related parameter, the hardware parameter and the determined maximum information block length. An information length after code block division is less than the determined maximum information block length.

Claims

1. A method of code block division, comprising: determining a maximum information block length of a code block according to a plurality of division related parameters associated with a Transport Block (TB), wherein the plurality of division related parameters includes physical channel resource parameters that describe a number of symbols and a number of subcarriers associated with the TB, and a plurality of spectral efficiency parameters that describe encoding parameters for the TB, wherein the plurality of spectral efficiency parameters include a modulation scheme (M) of a transmission signal that includes the TB, a coding rate (R) of the TB, and a number (N.sub.layer) of spatial layers occupied by the transmission signal; and dividing the TB having a size greater than the maximum information block length into two or more code blocks, wherein a number of the two or more code blocks is determined according to the maximum information block length, the size of the TB, and a length of cyclic redundancy check (CRC) bits of each code block, wherein an information length of each of the two or more code blocks after the dividing the TB is determined according to a set of information block lengths supported by an encoder, the number of the two or more code blocks, the size of the TB and the length of the CRC bits of each code block.

2. The method of claim 1, wherein the physical channel resource parameters comprise a number (N.sub.tb) of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the TB in a time domain.

3. The method of claim 1, wherein the physical channel resource parameters comprise a number (N.sub.subcarrier) of frequency-domain subcarriers occupied by the transmission signal that includes the TB.

4. The method of claim 1, wherein the information length of each of the two or more code blocks after the dividing the TB is less than the maximum information block length.

5. A wireless communication apparatus, comprising a processor configured to: determine a maximum information block length of a code block according to a plurality of division related parameters associated with a Transport Block (TB), wherein the plurality of division related parameters includes physical channel resource parameters that describe a number of symbols and a number of subcarriers associated with the TB, and a plurality of spectral efficiency parameters that describe encoding parameters for the TB, wherein the plurality of spectral efficiency parameters include a modulation scheme (M) of a transmission signal that includes the TB, a coding rate (R) of the TB, and a number (N.sub.layer) of spatial layers occupied by the transmission signal; and divide the TB having a size greater than the maximum information block length into two or more code blocks, wherein a number of the two or more code blocks is determined according to the maximum information block length, the size of the TB, and a length of cyclic redundancy check (CRC) bits of each code block, wherein an information length of each of the two or more code blocks after the TB is divided is determined according to a set of information block lengths supported by an encoder, the number of the two or more code blocks, the size of the TB and the length of the CRC bits of each code block.

6. The wireless communication apparatus of claim 5, wherein the physical channel resource parameters comprise a number (N.sub.tb) of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the TB in a time domain.

7. The wireless communication apparatus of claim 5, wherein the physical channel resource parameters comprise a number (N.sub.subcarrier) of frequency-domain subcarriers occupied by the transmission signal that includes the TB.

8. The wireless communication apparatus of claim 5, wherein the information length of each of the two or more code blocks after the TB is divided is less than the maximum information block length.

9. A non-transitory computer readable storage media comprising instructions for code block division, wherein the instructions configure a processor to perform a method comprising: determining a maximum information block length of a code block according to a plurality of division related parameters associated with a Transport Block (TB), wherein the plurality of division related parameters includes physical channel resource parameters that describe a number of symbols and a number of subcarriers associated with the TB, and a plurality of spectral efficiency parameters that describe encoding parameters for the TB, wherein the plurality of spectral efficiency parameters include a modulation scheme (M) of a transmission signal that includes the TB, a coding rate (R) of the TB, and a number (N.sub.layer) of spatial layers occupied by the transmission signal; and dividing the TB having a size greater than the maximum information block length into two or more code blocks, wherein a number of the two or more code blocks is determined according to the maximum information block length, the size of the TB, and a length of cyclic redundancy check (CRC) bits of each code block, wherein an information length of each of the two or more code blocks after the dividing the TB is determined according to a set of information block lengths supported by an encoder, the number of the two or more code blocks, the size of the TB and the length of the CRC bits of each code block.

10. The non-transitory computer readable storage media of claim 9, wherein the physical channel resource parameters comprise a number (N.sub.tb) of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the TB in a time domain.

11. The non-transitory computer readable storage media of claim 9, wherein the physical channel resource parameters comprise a number (N.sub.subcarrier) of frequency-domain subcarriers occupied by the transmission signal that includes the TB.

12. The non-transitory computer readable storage media of claim 9, wherein the information length of each of the two or more code blocks after the dividing the TB is less than the maximum information block length.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structure diagram of a digital communication system;

(2) FIG. 2 is a flowchart of processing of channel encoding chain;

(3) FIG. 3 is a schematic diagram of code block division;

(4) FIG. 4 is a schematic diagram of an RB whose time length is one time slot in the OFDM system;

(5) FIG. 5 is a schematic diagram of a method for physical channel mapping in an LTE system;

(6) FIG. 6 is a flowchart of a method for code block division according to an embodiment of the disclosure;

(7) FIG. 7 is a structure diagram of an apparatus for code block division according to an embodiment of the disclosure;

(8) FIG. 8 is a schematic diagram of code block division according to the first embodiment of the disclosure;

(9) FIG. 9 is a schematic diagram of code block division according to the second embodiment of the disclosure; and

(10) FIG. 10 is a schematic diagram of code block division according to the ninth embodiment of the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(11) FIG. 6 is a flowchart of a method for code block division according to an embodiment of the disclosure. As shown in FIG. 6, the method may include the following acts.

(12) At act S600, the reference information block length of the code block may be determined according to the obtained division related parameter.

(13) At this act, the division related parameter may include: the physical channel resource parameter, and/or the spectral efficiency parameter.

(14) At this act, the reference information block length may be determined by, for example, the following several manners.

(15) Manner 1:

(16) The spectral efficiency parameter may at least include any one or more of the following parameters: the modulation scheme M of the transmission signal, the coding rate R of the TB, and the number N.sub.layer of spatial layers occupied by a transmission signal.

(17) The physical channel resource parameter may include: the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain and the number N.sub.subcarrier of frequency-domain subcarriers occupied by a transmission signal.

(18) The act of determining the reference information block length may include the following act.

(19) The reference information block length K.sub.R of the code block may be determined according to the physical channel resource parameter and the spectral efficiency parameter.

(20) In an exemplary embodiment, the reference information block length K.sub.R of the code block may be obtained based on a following formula: K.sub.R=N.sub.cb.Math.N.sub.subcarrier.Math.M.Math.R.Math.N.sub.layer.

(21) In the embodiment, the number N.sub.subcarrier of frequency-domain subcarriers occupied by the transmission signal may be equal to a product of the number N.sub.RB of RBs occupied by the transmission signal and the number N.sub.SP of subcarriers included in each RB. That is, the reference information block length K.sub.R of the code block may be obtained based on a following formula: K.sub.R=N.sub.cb.Math.N.sub.subcarrier.Math.M.Math.R.Math.N.sub.layer.

(22) Note that, the value of N.sub.SP is e.g., 12 in the LTE and LTE-A system.

(23) Manner 2:

(24) The physical channel resource parameter may at least include: the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain. The division related parameter may further include a size B of the TB and a length L of a CRC of each code block.

(25) The act of determining the reference information block length K.sub.R of the code block may include the following act. The reference information block length K.sub.R of the code block may be determined according to the size B of the TB, the length L of the CRC of each code block and the physical channel resource parameter.

(26) In an exemplary embodiment, the reference information block length K.sub.R of the code block may be obtained based on a following formula:

(27) $K_R=B.Math.\frac{N_{\mathrm{cb}}}{N_{\mathrm{tb}}}+L.$

(28) Manner 3:

(29) The division related parameter may further include a hardware parameter. The hardware parameter may include the UE Category parameter which is able to indicate the buffer size of the terminal.

(30) The physical channel resource parameter may at least include: the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain.

(31) The act of determining the reference information block length K.sub.R of the code block may include the following acts.

(32) The maximum number N.sub.Softbits of soft bits which are able to be occupied by the TB may be obtained according to the UE Category parameter which is able to indicate the buffer size of the terminal.

(33) According to the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain, the minimum number CB.sub.num of code blocks included in the TB may be obtained based on a following formula: CB.sub.Num=┌N.sub.tb/N.sub.cb┐.

(34) The reference information block length K.sub.R may be obtained based on a following formula:

(35) $K_R=.Math.\frac{N_{\mathrm{Softbits}}}{C{P}_{\mathrm{Num}}}.Math.R.Math..$

(36) At this act, at least one of the division related parameter and the hardware parameter may be obtained through any one or more of the following modes: the transmission mode indication, the DCI format and the RNTI.

(37) At act S601, the maximum information block length may be determined according to the reference information block length and the hardware parameter.

(38) At this act, the hardware parameter may include at least one of: a maximum information block length K.sub.encoder supported by the encoder, and a set {K}.sub.interleaver of information block lengths supported by an encoder.

(39) When an encoding method of the TB is the convolutional code, the maximum information block length K.sub.max may be determined based on a following formula:
K.sub.max=min(K.sub.R,K.sub.encoder).

(40) When the encoding method of the TB is the Turbo code, the act of determining the maximum information block length K.sub.max may include the following acts.

(41) When the reference information block length K.sub.R is less than the maximum information block length K.sub.encoder supported by the encoder, an information block length which is greater than or equal to the reference information block length K.sub.R of the code block and is closest to the reference information block length K.sub.R may be selected from the set {K}.sub.interleaver of information block lengths supported by the encoder may be selected as the maximum information block length K.sub.max of the code block.

(42) When the reference information block length K.sub.R is greater than or equal to the maximum information block length K.sub.encoder supported by the encoder, the maximum information block length K.sub.encoder supported by the encoder may be selected as the maximum information block length K.sub.max of the code block.

(43) Herein the function min ( ) means selecting a minimum value.

(44) In an exemplary embodiment, when the encoding method of the TB is the Turbo code, the maximum information block length K.sub.max may be determined based on a following formula:

(45) $K_{\max }=\{\begin{array}{cc}\underset{\hat{K}\ge K_R,\hat{K}\in \left\{K_{\mathrm{interleaver}}\right\}}{\arg \min }\left(\hat{K}-K_R\right),& K_R<K_{\mathrm{encoder}}\\ K_{\mathrm{encoder}},& K_R\ge K_{\mathrm{encoder}}\end{array}.$

(46) The method of the disclosure may further include the following act.

(47) The maximum information block length K.sub.max may be obtained through direct indication given via the transmission mode indication, or the DCI format, or the RNTI.

(48) Note that, the maximum information block length K.sub.max obtained through direct indication may be the maximum information block length K.sub.max set according to a value required by the system, e.g. a time delay requirement of the system. The system performance may be ensured by directly indicating the maximum information block length K.sub.max.

(49) At act S602, the TB having a length greater than the maximum information block length may be divided into two or more code blocks according to the division related parameter, the hardware parameter and the determined maximum information block length.

(50) At this act, the division related parameter may further include a size B of the TB and a length L of the CRC of each code block.

(51) The hardware parameter may at least include: a set {K}.sub.interleaver of information block lengths supported by an encoder.

(52) The code block division may include the following acts.

(53) The number C of divided code blocks may be determined according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max.

(54) An information block length of each code block may be determined according to the set {K}.sub.interleaver of information block lengths supported by the encoder, the number C of code blocks, the size B of the TB and the length L of the CRC of each code block.

(55) The code block division may be performed according to the determined information block length of each code block.

(56) In an exemplary embodiment, the number C of divided code blocks may be determined based on a following formula:

(57) $C=.Math.\frac{B}{K_{\max }-L}.Math.;$
where ┌x┐ means rounding up X to an integer.

(58) The act of determining the information block length of each code block may include the following acts.

(59) When the size B of the TB is able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the information block length of each code block may be B/C.

(60) When the size B of the TB is not able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the C code blocks may be divided into first type of code blocks and second type of code blocks with different code block information block lengths.

(61) A code block information block length K.sub.I of the first type of code blocks may be a minimum K value, satisfying that a product of the number C of code blocks and the code block information block length K.sub.I of the first type of code blocks is greater than or equal to the size B of the TB, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(62) A code block information block length K.sub.II of the second type of code blocks may be a maximum K value, satisfying that the code block information block length K.sub.II of the second type of code blocks is less than the code block information block length K.sub.I of the first type of code blocks, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(63) In an exemplary embodiment, the code block information block length Ku of the first type of code blocks may be:

(64) 0$K_I=\underset{K\ge .Math.\frac{B}{C}.Math.,K\in {\left\{K\right\}}_{\mathrm{interleaver}}}{\arg \min }\left(K-.Math.\frac{B}{C}.Math.\right).$

(65) The code block information block length K.sub.II of the second type of code blocks may be:

(66) $K_{\mathrm{II}}=\underset{K_I,K_{\mathrm{II}}\in {\left\{K\right\}}_{\mathrm{interleaver}},K_{\mathrm{II}}<K_I}{\arg \min }\left(K_I-K_{\mathrm{II}}\right).$

(67) The number C.sub.I of the first type of code blocks and the number C.sub.II of the second type of code blocks may satisfy:

(68) $C_{\mathrm{II}}=.Math.\frac{C.Math.K_I-\left(B+C.Math.L\right)}{K_I-K_{\mathrm{II}}}.Math.,$
where C.sub.IC−C.sub.II; argmin (F(X)) means minimizing F(X); and ┌x┐ means rounding down x to an integer.

(69) The method of the disclosure may further include the following act. After the code block division is completed, the former C.sub.II code blocks may be set as the second type of code blocks, and the latter C.sub.I code blocks may be set as the first type of code blocks.

(70) The method of the disclosure may further include the following act.

(71) CRC adding, channel encoding and rate matching may be respectively performed on each divided code block to obtain a corresponding encoded code block, and code block cascading may be performed to obtained encoded code blocks.

(72) The method of the disclosure may further include the following act.

(73) The block encoding may be performed to two or more divided code blocks to generate the check data block.

(74) The method of the disclosure may further include the following act.

(75) A part of bits at any position of each encoded code block and a part of bits at any position of each check data block generated by performing block encoding may be deleted.

(76) A size of the part of bits may be computed through the following acts.

(77) A sum of numbers of bits of all encoded code blocks and all check data blocks generated by performing the block encoding, and a sum of numbers of bits of all the encoded code blocks before the block encoding may be computed.

(78) The sum of the numbers of bits of all the encoded code blocks before the block encoding may be subtracted from the sum of the numbers of bits of all the encoded code blocks and all the check data blocks generated by performing the block encoding to obtain a bit number difference value.

(79) The number of encoded code blocks may be added to the number of check data blocks generated by performing the block encoding to obtain a sum of information blocks.

(80) The quotient obtained by dividing the obtained bit number difference value by the sum of obtained information blocks may be used as the size of the part of bits.

(81) Note that, the part of bits deleted may be the check data of the encoded code block and the check data block, usually being at the tail of the encoded code block and the check data block.

(82) The method of the disclosure may further include the following act.

(83) The code block cascading may be performed to the encoded code blocks from which the part of bits has been deleted and the check data blocks generated by performing the block encoding from which the part of bits has been deleted.

(84) The code block cascading may include: connecting in series bits of the encoded code blocks from which the part of bits has been deleted and bits of the check data blocks generated by performing the block encoding from which the part of bits has been deleted, and putting the check data blocks generated by performing the block encoding from which the part of bits has been deleted behind the encoded code blocks from which the part of bits has been deleted.

(85) By determining the reference information block length of the code block according to the obtained division related parameter, and performing the code block division of the TB so that each code block is less than the determined maximum information block length, the method of some embodiments of the disclosure may reduce the delay brought by the code block division to a system, avoid influences on the work of the system due to the delay caused by the code block division, and improve system performance.

(86) FIG. 7 is a structure diagram of an apparatus for code block division according to an embodiment of the disclosure. As shown in FIG. 7, the apparatus may include: a reference unit, a determining unit and a dividing unit.

(87) The reference unit may be configured to determine the reference information block length of the code block according to the obtained division related parameter.

(88) The reference unit may be configured to determine the reference information block length of the code block according to at least one of obtained physical channel resource parameter and spectral efficiency parameter.

(89) The reference unit may be configured to determine the reference information block length K.sub.R of the code block according to the obtained spectral efficiency parameter and the obtained physical channel resource parameter. The spectral efficiency parameter may include any one or more of the following parameters: the modulation scheme M of the transmission signal, the coding rate R of the TB, and the number N.sub.layer of spatial layers occupied by a transmission signal. The physical channel resource parameter may include: the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain and the number N.sub.subcarrier of frequency-domain subcarriers occupied by a transmission signal.

(90) The reference unit may be configured to, according to at least one of the obtained physical channel resource parameter and spectral efficiency parameter, obtain the reference information block length K.sub.R of the code block based on a following formula
K.sub.R=N.sub.cb.Math.N.sub.subcarrier.Math.M.Math.R.Math.N.sub.layer.

(91) The reference unit may be further configured to,

(92) obtain a size B of the TB and a length L of the CRC of each code block, and

(93) determine the reference information block length K.sub.R of the code block according to the obtained physical channel resource parameter which may include the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain.

(94) The reference unit may be further configured to obtain the size B of the TB and the length L of the CRC of each code block, and determine, based on a following formula

(95) $K_R=B.Math.\frac{N_{\mathrm{cb}}}{N_{\mathrm{tb}}}+L,$
the reference information block length K.sub.R of the code block according to the obtained physical channel resource parameter.

(96) The reference unit may be further configured to,

(97) obtain the hardware parameter at least including the UE Category parameter which is able to indicate the buffer size of the terminal,

(98) obtain, according to the UE Category parameter which is able to indicate the buffer size of the terminal, the maximum number N.sub.Softbits of soft bits which are able to be occupied by the TB,

(99) obtain the minimum number CB.sub.num of code blocks included in the TB CB.sub.Num=┌N.sub.tb/N.sub.cb┐ according to the obtained physical channel resource parameter which may include the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain, and

(100) obtain the reference information block length K.sub.R based on a following formula:

(101) $K_R=.Math.\frac{N_{\mathrm{Softbits}}}{C{P}_{\mathrm{Num}}}.Math.R.Math..$

(102) The determining unit may be configured to determine a maximum information block length according to the reference information block length and the hardware parameter.

(103) The hardware parameter may include at least one of: a maximum information block length K.sub.encoder supported by the encoder, and a set {K}.sub.interleaver of information block lengths supported by an encoder.

(104) The determining unit may be configured to determine the maximum information block length according to the reference information block length and the hardware parameter in a following manner.

(105) When an encoding method of the TB is the convolutional code, the maximum information block length K.sub.max may be determined based on a following formula:
K.sub.max=min(K.sub.R,K.sub.encoder);

(106) When the encoding method of the TB is the Turbo code, that the maximum information block length K.sub.max is determined may include the following acts.

(107) When the reference information block length K.sub.R is less than the maximum information block length K.sub.encoder supported by the encoder, an information block length which is greater than or equal to the reference information block length K.sub.R of the code block and is closest to the reference information block length K.sub.R may be selected from the set {K}.sub.interleaver of information block lengths supported by the encoder as the maximum information block length K.sub.max of the code block.

(108) When the reference information block length K.sub.R is greater than or equal to the maximum information block length K.sub.encoder supported by the encoder, the maximum information block length K.sub.encoder supported by the encoder may be selected as the maximum information block length K.sub.max of the code block.

(109) In the embodiment, the function min ( ) means selecting a minimum value.

(110) The hardware parameter may include at least one of: a maximum information block length K.sub.encoder supported by the encoder, and a set {K}.sub.interleaver of information block lengths supported by an encoder.

(111) The determining unit may be configured to determine the maximum information block length according to the reference information block length and the hardware parameter in the following manner.

(112) When an encoding method of the TB is the convolutional code, the maximum information block length K.sub.max may be determined based on a following formula:
K.sub.max=min(K.sub.R,K.sub.encoder).

(113) When the encoding method of the TB is the Turbo code, the maximum information block length K.sub.max may be determined based on a following formula:

(114) $K_{\max }=\{\begin{array}{cc}\underset{\hat{K}\ge K_R,\hat{K}\in \left\{K_{\mathrm{interleaver}}\right\}}{\arg \min }\left(\hat{K}-K_R\right),& K_R<K_{\mathrm{encoder}}\\ K_{\mathrm{encoder}},& K_R\ge K_{\mathrm{encoder}}\end{array}.$

(115) The apparatus of the disclosure may further include: an obtaining unit, which may be configured to obtain at least one of the division related parameter and the hardware parameter through one or more of the transmission mode indication, the DCI format and the RNTI.

(116) The apparatus of the disclosure may further include: an indicating unit, which may be configured to obtain the maximum information block length K.sub.max through any one or more of the transmission mode indication, the DCI format and the RNTI.

(117) The dividing unit may be configured to divide the TB having a length greater than the maximum information block length into two or more code blocks according to the obtained division related parameter, the hardware parameter and the determined maximum information block length.

(118) The information block length after the code block division may be less than the determined maximum information block length.

(119) The division related parameter may further include a size B of the TB and a length L of the CRC of each code block.

(120) The hardware parameter may at least include: a set {K}.sub.interleaver of information block lengths supported by an encoder.

(121) The dividing unit may be configured to,

(122) determine the number C of divided code blocks according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max,

(123) determine an information block length of each code block according to the set {K}.sub.interleaver of information block lengths supported by the encoder, the number C of code blocks, the size B of the TB and the length L of the CRC of each code block, and

(124) perform the code block division according to the determined information block length of each code block.

(125) The dividing unit may be configured to,

(126) determine the number C of divided code blocks based on a following formula

(127) $C=.Math.\frac{B}{K_{\max }-L}.Math.;$
where ┌x┐ means rounding up X to an integer,

(128) determine an information block length of each code block according to the set {K}.sub.interleaver of information block lengths supported by the encoder, the number C of code blocks, the size B of the TB and the length L of the CRC of each code block, and

(129) perform the code block division according to the determined information block length of each code block.

(130) The dividing unit may be configured to,

(131) determine the number C of divided code blocks according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max.

(132) When the size B of the TB is able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the information block length of each code block may be B/C.

(133) When the size B of the TB is not able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the C code blocks may be divided into first type of code blocks and second type of code blocks with different code block information block lengths.

(134) A code block information block length K.sub.I of the first type of code blocks may be a minimum K value, satisfying that a product of the number C of code blocks and the code block information block length K.sub.I of the first type of code blocks is greater than or equal to the size B of the TB, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(135) A code block information block length K.sub.II of the second type of code blocks may be a maximum K value, satisfying that the code block information block length K.sub.II of the second type of code blocks is less than the code block information block length Ku of the first type of code blocks, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(136) The dividing unit may be configured to perform the code block division according to the determined information block length of each code block.

(137) The dividing unit may be configured to,

(138) determine the number C of divided code blocks according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max.

(139) When the size B of the TB is able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the information block length of each code block may be B/C.

(140) When the size B of the TB is not able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the C code blocks may be divided into first type of code blocks and second type of code blocks with different code block information block lengths.

(141) The dividing unit may be configured to compute the code block information block length K.sub.I of the first type of code blocks based on a following formula:

(142) $K_I=\underset{K\ge .Math.\frac{B}{C}.Math.,K\in {\left\{K\right\}}_{\mathrm{interleaver}}}{\arg \min }\left(K-.Math.\frac{B}{C}.Math.\right),$
and compute the code block information block length K.sub.II of the second type of code blocks based on a following formula:

(143) $K_{\mathrm{II}}=\underset{K_I,K_{\mathrm{II}}\in {\left\{K\right\}}_{\mathrm{interleaver}},K_{\mathrm{II}}<K_I}{\arg \min }\left(K_I-K_{\mathrm{II}}\right).$

(144) The number C.sub.I of the first type of code blocks and the number C.sub.II of the second type of code blocks may satisfy:

(145) $C_{\mathrm{II}}=.Math.\frac{C.Math.K_I-\left(B+C.Math.L\right)}{K_I-K_{\mathrm{II}}}.Math.,$
where C.sub.I=C−C.sub.II.

(146) The dividing unit may be configured to perform the code block division according to the determined information block length of each code block.

(147) The apparatus of the disclosure may further include: a setting unit, which may be configured to, after the dividing unit completes the code block division, set the former C.sub.II code blocks as the second type of code blocks, and set the latter C.sub.I code blocks as the first type of code blocks.

(148) The apparatus of the disclosure may further include: a cascading unit, which may be configured to respectively perform CRC adding, channel encoding and rate matching on each divided code block to obtain a corresponding encoded code block, and perform code block cascading to obtained encoded code blocks.

(149) The apparatus of the disclosure may further include: a checking unit, which may be configured to perform the block encoding to two or more than two divided code blocks to generate the check data block.

(150) The apparatus of the disclosure may further include: a deleting unit, which may be configured to delete a part of bits at any position of each encoded code block and a part of bits at any position of each check data block generated by performing the block encoding.

(151) A size of the part of bits may be computed through the following acts.

(152) A sum of numbers of bits of all encoded code blocks and all check data blocks generated by performing the block encoding, and a sum of numbers of bits of all the encoded code blocks before the block encoding may be computed.

(153) The sum of the numbers of bits of all the encoded code blocks before the block encoding may be subtracted from the sum of the numbers of bits of all the encoded code blocks and all the check data blocks generated by performing the block encoding to obtain the bit number difference value.

(154) The number of encoded code blocks may be added to the number of check data blocks generated by performing the block encoding to obtain a sum of information blocks.

(155) The quotient obtained by dividing the obtained bit number difference value by the sum of obtained information blocks may be used as the size of the part of bits.

(156) The apparatus of the disclosure may further include: a check cascading unit, which may be configured to perform the code block cascading on the encoded code blocks from which the part of bits has been deleted and the check data blocks generated by performing the block encoding from which the part of bits has been deleted.

(157) The code block cascading may include: connecting in series bits of the encoded code blocks from which the part of bits has been deleted and bits of the check data blocks generated by performing the block encoding from which the part of bits has been deleted, and putting the check data blocks generated by performing the block encoding from which the part of bits has been deleted behind the encoded code blocks from which the part of bits has been deleted.

(158) The method of the disclosure is elaborated below through embodiments.

Embodiment 1

(159) In a communication system based on the 3GPP LTE and LTE-A technology, a first transmission node may send a TB with a length of B bits to a second transmission node, and compute the maximum number N.sub.REN.sub.cb×N.sub.subcarrier of REs allowed to be occupied by each code block according to the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain and the number N.sub.subcarrier of frequency-domain subcarriers occupied by the transmission signal included in the division related parameter.

(160) The first information block length K.sub.R=N.sub.RE×M×R×N.sub.layer of the code block may be determined according to the maximum number N.sub.RE of REs allowed to be occupied by each code block, the modulation scheme M of the transmission signal, the coding rate R of the TB, and the number N.sub.layer of spatial layers occupied by the transmission signal.

(161) The maximum information block length may be determined according to the maximum information block length K.sub.encoder supported by the encoder, the set {K}.sub.interleaver of information block lengths supported by the encoder and the first information block length K.sub.R. The maximum information block length K.sub.encoder may be the maximum element in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(162) As an exemplary embodiment, the first information block length K.sub.R may be compared with the maximum information block length K.sub.encoder supported by the encoder, min(N.sub.cb.Math.N.sub.RB.Math.N.sub.SP.Math.M.Math.R.Math..Math.N.sub.layer, K.sub.encoder).

(163) The maximum information block length K.sub.max may be determined based on a following formula:

(164) 0$K_{\max }=\underset{\hat{K}\ge K_{\mathrm{one}},\hat{K}\in {\left\{K\right\}}_{\mathrm{interleaver}}}{\arg \min }\left(\hat{K}-\min \left(N_{\mathrm{cb}}.Math.N_{\mathrm{RB}}.Math.N_{\mathrm{SP}}.Math.M.Math.R.Math.N_{\mathrm{layer}},K_{\mathrm{encoder}}\right)\right);$
where K.sub.R=N.sub.cb.Math.N.sub.RB.Math.N.sub.SP.Math.M.Math.R.Math.N.sub.layer.

(165) When the size B of the TB is greater than K.sub.max, the TB may be divided into multiple code blocks.

(166) The number C of divided code blocks may be determined according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max.

(167) In the present embodiment, B is able to be divided evenly by (K.sub.max−L), where the number C of code blocks may be expressed as the following form:

(168) $C=\frac{B}{K_{\max }-L},$
the information block length of each code block may be B/C.

(169) In an exemplary embodiment, the channel encoding and the rate matching may be performed to C code blocks after the code block division performed to the TB to obtain C encoded code blocks, and then the code block cascading may be performed to the C encoded code blocks.

(170) FIG. 8 is a schematic diagram of code block division according to the first embodiment of the disclosure. As shown in FIG. 8, any code block may be allowed to occupy, in the time domain, 1 OFDM symbol, that is, N.sub.cb=1, then each code block is limited, in the time domain, to not exceeding time length of 1 OFDM symbol. A receiving node may immediately start to decode after receiving a code block. Note that, the N.sub.cb may also be greater than 1. Generally, if the service is more sensitive to the time delay, the value of the N.sub.cb may be smaller (the smallest value is 1); and if the service is not sensitive to the time delay, the value of the N.sub.cb may be greater. As such, the control the transmission node has over the time delay may be enhanced by adjusting the N.sub.cb, which may be especially applicable to communication scenarios with super real time and variable time delay.

Embodiment 2

(171) In the communication system based on the 3GPP LTE and LTE-A technology, the first transmission node may send the TB with a length of B bits to the second transmission node, and determine, according to the size B of the TB, the length L of the CRC of each code block, the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain included in the division related parameter, the second information block length KR as:

(172) $K_R=B.Math.\frac{N_{\mathrm{cb}}}{N_{\mathrm{tb}}}+L.$

(173) The maximum information packet length K.sub.max may be determined according to the maximum information block length K.sub.encoder supported by the encoder and the set {K}.sub.interleaver of information block lengths supported by the encoder. The maximum information packet length K.sub.max may be the maximum element in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(174) The maximum information packet length K.sub.max may be determined based on a following formula

(175) $K_{\max }=\underset{\hat{K}\ge K_B,\hat{K}\in \left\{K_{\mathrm{interleaver}}\right\}}{\arg \min }\left(\hat{K}-\min \left(K_R,K_{\mathrm{encoder}}\right)\right).$

(176) When the size B of the TB is greater than K.sub.max, the TB may be divided into multiple code blocks.

(177) The number C of divided code blocks may be determined according to the size B of the TB, the length L of the CRC of each code block and the maximum information block length K.sub.max.

(178) In the present embodiment, B is not able to be divided evenly by (K.sub.max−L). The number C of code blocks may be expressed as the following form:

(179) $C=.Math.\frac{B}{K_{\max }-L}.Math.;$
where ┌x┐ means rounding up X to an integer.

(180) An information block length of each code block may be determined according to the set {K}.sub.interleaver of information block lengths supported by the encoder.

(181) When the size B of the TB is not able to be divided evenly by (K.sub.max−L) or the number C of code blocks, the C code blocks may be divided into first type of code blocks and second type of code blocks with different code block information block lengths.

(182) A code block information block length K.sub.I of the first type of code blocks may be a minimum K value, satisfying that a product of the number C of code blocks and the code block information block length K.sub.I of the first type of code blocks is greater than or equal to the size B of the TB, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(183) A code block information block length K.sub.II of the second type of code blocks may be a maximum K value, satisfying that the code block information block length K.sub.II of the second type of code blocks is less than the code block information block length K.sub.I of the first type of code blocks, in the set {K}.sub.interleaver of information block lengths supported by the encoder.

(184) In an exemplary embodiment, the code block information block length Ku of the first type of code blocks may be:

(185) $K_I=\underset{K\ge .Math.\frac{B}{C}.Math.,K\in {\left\{K\right\}}_{\mathrm{interleaver}}}{\arg \min }\left(K-.Math.\frac{B}{C}.Math.\right).$

(186) The code block information block length K.sub.II of the second type of code blocks may be:

(187) $K_{\mathrm{II}}=\underset{K_I,K_{\mathrm{II}}\in {\left\{K\right\}}_{\mathrm{interleaver}},K_{\mathrm{II}}<K_I}{\arg \min }\left(K_I-K_{\mathrm{II}}\right).$

(188) The number C.sub.I of the first type of code blocks and the number C.sub.II of the second type of code blocks may satisfy:

(189) $C_{\mathrm{II}}=.Math.\frac{C.Math.K_I-\left(B+C.Math.L\right)}{K_I-K_{\mathrm{II}}}.Math.,$
where C.sub.I=C−C.sub.II.

(190) In an exemplary embodiment, the channel encoding and the rate matching may be performed to C code blocks after the code block division performed to the TB to obtain C encoded code blocks, and then the code block cascading may be performed to the C encoded code blocks. The former C.sub.II code blocks may be set as the second type of code blocks, and the latter C.sub.I code blocks may be set as the first type of code blocks.

(191) FIG. 9 is a schematic diagram of code block division according to the second embodiment of the disclosure. In the figure, the code blocks shown by the pane with left oblique lines is the second type of code blocks. The present embodiment may achieve controlling the time delay by limiting the number of OFDM symbols occupied by each code block in the time domain. At the same time, the method for code block division provided by the present embodiment may be used for coping with the situation where the length of the TB cannot be evenly divided by the number of code blocks.

Embodiment 3

(192) The difference between this present embodiment and embodiment 1 and embodiment 2 is that: the maximum number Nib of OFDM symbols allowed to be occupied by each code block in the time domain is indicated by the transmission mode.

(193) For example, the system may define new transmission modes A, B and C which respectively indicate three transmission modes aiming at the scenarios with different requirements on the time delay. The transmission mode A has the highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 1. The transmission mode B has the second highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 3. The transmission mode C has the lowest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 14.

(194) The base station may configure the transmission modes A, B and C semi-statically through high-level signaling; that is, the transmission mode may implicitly indicate the maximum number of OFDM symbols occupied by a single code block.

Embodiment 4

(195) Compared with embodiment 3, the maximum information block length K.sub.max of the code block is indicated by the transmission mode in the present embodiment.

Embodiment 5

(196) The difference between this present embodiment and embodiment 3 is that: the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain is indicated by the DCI format.

(197) For example, the system may define the DCI formats X, Y, and Z which respectively indicate three transmission modes aiming at the scenarios with different requirements on the time delay. The DCI format X has the highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 1. The DCI format Y has the second highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 3. The DCI format Z has the lowest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 14.

(198) The DCI format may be sent by the base station to a relay or a terminal through the PDCCH; or the DCI format may be sent to the terminal by the relay.

Embodiment 6

(199) The difference between this present embodiment and embodiment 5, the maximum information block length K.sub.max of the code block is indicated by the DCI format.

Embodiment 7

(200) The difference between this present embodiment and embodiment 5 is that: the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain is implicitly indicated by the RNTI.

(201) For example, the system may define three RNTIs 1, 2, and 3 which respectively indicate three transmission modes aiming at the scenarios with different requirements on the time delay. The RNTI 1 has the highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 1. The RNTI 2 has the second highest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 3. The RNTI 3 has the lowest requirement on the time delay, and the number of OFDM symbols occupied by a single code block cannot be greater than 14;

(202) The RNTI may be allocated to the relay or the terminal by the base station, or may be allocated to the terminal by the relay. In addition, the RNTI may be used for scrambling the PDCCH.

Embodiment 8

(203) The difference between this present embodiment and embodiment 7 is that: the maximum information block length K.sub.max of the code block is indicated by the RNTI.

Embodiment 9

(204) The difference between this present embodiment and embodiment 1 or 2 is that: the maximum information block length K.sub.max may be determined according to the UE Category parameter which is able to indicate the buffer size of the terminal, the number N.sub.tb of OFDM symbols occupied by the TB in a time domain, the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain, and the coding rate R.

(205) In an exemplary embodiment, the maximum number N.sub.Softbits of soft bits which are able to be occupied by the TB may be obtained according to the UE Category parameter which is able to indicate the buffer size of the terminal. According to the number N.sub.tb of OFDM symbols occupied by the TB in a time domain and the maximum number N.sub.cb of OFDM symbols allowed to be occupied by each code block in the time domain, the minimum number CB.sub.num of code blocks included in the TB may be obtained based on a following formula: CB.sub.Num=┌N.sub.tb/N.sub.cb┐.

(206) The reference information block length K.sub.R may be obtained based on a following formula:

(207) $K_R=.Math.\frac{N_{\mathrm{Softbits}}}{{\mathrm{CB}}_{\mathrm{Num}}}.Math.R.Math..$

(208) When an encoding method of the TB is the convolutional code, K.sub.max=K.sub.R.

(209) When the encoding method of the TB is the Turbo code, the maximum information block length K.sub.max may be determined according to the maximum information block length K.sub.encoder supported by the encoder and the set {K}.sub.interleaver of information block lengths supported by the encoder.

(210) When the encoding method of the TB is the convolutional code, the maximum information block length K.sub.max may be determined based on a following formula:
K.sub.max=min(K.sub.R,K.sub.encoder).

(211) When the encoding method of the TB is the Turbo code, the maximum information block length K.sub.max may be determined based on a following formula:

(212) $K_{\max }=\underset{\hat{K}\ge K_R,\hat{K}\in \left\{K_{\mathrm{interleaver}}\right\}}{\arg \min }\left(\hat{K}-K_R\right).$

Embodiment 9

(213) Compared with embodiment 1 and embodiment 2, in the present embodiment:

(214) the channel encoding and the rate matching may be performed to C code blocks after the code block division to obtain C encoded code blocks, and then the bit or symbol with the same index position in each encoded code block is encoded to generate S check data blocks;

(215) a part of bits in the C encoded code blocks and the S check data blocks may be deleted, so that the sum of bits of the C encoded code blocks and the S check data blocks may be equal to the sum of bits of the C encoded code blocks before the block encoding;

(216) the code block cascading may be performed to the C encoded code blocks from which a part of bits have been deleted and the S check data blocks from which a part of bits have been deleted. The code block cascading may include: connecting in series the bits of each code block, and the S check data blocks from which a part of bits have been deleted are put behind the C encoded code blocks from which a part of bits have been deleted.

(217) FIG. 10 is a schematic diagram of code block division according to the ninth embodiment of the disclosure. As shown in FIG. 10, the check data blocks shown by the pane with right oblique lines is generated through the block encoding. By means of the processing of the present embodiment, the whole performance of the TB may be ensured.

(218) Those of ordinary skill in the art may understand that all or part of the acts in the method may be completed by instructing related hardware (e.g., processor) through a program. The program may be stored in computer-readable storage media, such as a read-only memory, a magnetic disk or a compact disc. In an exemplary embodiment, all or part of the acts in the embodiments may also be implemented by one or more integrated circuits. Correspondingly, each module/unit in the embodiments may be implemented in form of hardware, for example, its corresponding function is implemented through an integrated circuit. Each module/unit in the embodiments may also be implemented in form of software function module, for example, its corresponding function is implemented by a processor executing a program/instruction stored in the memory. The disclosure is not limited to any particular combination of hardware and software.

(219) Although the disclosed implementations of the disclosure are described above, the contents are the implementations adopted only for facilitating understanding of the disclosure and not intended to limit the disclosure. Those skilled in the art may make any modification and variation to the implementation forms and details without departing from the scope of the disclosure, but the scope of patent protection of the disclosure is still subject to the scope defined by the appended claims.

INDUSTRIAL APPLICABILITY

(220) The technical solutions of some embodiments of the disclosure may reduce the delay brought by the code block division to a system, avoid influences on the work of the system due to the delay caused by the code block division, and improve system performance.