Method for a transport block size determination procedure
A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises determining an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and a wireless network node based on a plurality of transmission parameters, modifying the intermediate TBS to generate a modified TBS in response to at least one event, and determining a final TBS based on the modified TBS and a specific step in response to the at least one event, wherein the specific step is determined based on the plurality of transmission parameters.
1. A wireless communication method for use in a wireless terminal, the wireless communication method comprising:
receiving, from a wireless network node, a signal indicating a plurality of transmission parameters,
determining an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and the wireless network node based on the plurality of transmission parameters,
modifying the intermediate TBS to generate a modified TBS in response to at least one event, and
determining a final TBS based on the modified TBS and a specific step in response to the at least one event,
wherein the specific step is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters comprises a type of a transmission mode configured for the wireless terminal, and wherein the transmission mode is determined based on one of a user equipment (UE) capability and a UE category,
wherein a number of physical resource blocks (PRBs) in the signal is quantized by a scaling factor which is associated with a bandwidth of a bandwidth part of the wireless terminal.
2. The wireless communication method of claim 1 , wherein the plurality of transmission parameters comprises at least one of:
a downlink control information (DCI) format,
a type of a frequency range,
a type of a radio network temporary identifier (RNTI) scrambling a cyclic redundancy check (CRC) of DCI,
a number of PRBs used to determine the intermediate TBS,
a modulation and coding scheme (MCS) index used to determine a code rate and modulation order,
a coverage capability of the wireless terminal,
a value of sub-carrier spacing, or
a value of an average orthogonal frequency-division multiplexing (OFDM) symbol duration,
wherein the number of physical resource blocks is smaller than or equal to a maximum number of PRBs, wherein the maximum number of PRBs is determined based on at least one of a maximum bandwidth supported by the wireless terminal, the maximum symbols per slot used for data scheduling, and the type of the transmission mode of the wireless terminal, and
wherein the type of the transmission mode of the wireless terminal is associated with at least one of:
the maximum bandwidth supported by the wireless terminal,
a minimum bandwidth supported by the wireless terminal,
a maximum number of layers supported by the wireless terminal,
a maximum number of antenna ports for transmitting the signal,
a peak data rate for uplink and/or downlink supported by the wireless terminal,
a battery life of the wireless terminal,
a modulation order supported by the wireless terminal,
a maximum code rate supported by the wireless terminal,
a maximum TBS supported by the wireless terminal,
a maximum number of PRBs associated with a bandwidth supported by the wireless terminal,
a target block error rate of transmitting the signal,
an end-to-end latency supported by the wireless terminal,
a number of frequency range (FR) types supported by the wireless terminal,
a coverage enhancement capability of the wireless terminal,
a power class of the wireless terminal,
a processing time capability of the wireless terminal,
a type of use case of the wireless terminal, wherein the use case comprises at least one of an industrial wireless sensor, a video surveillance or a wearable device, or
a duplex mode of the wireless terminal.
3. The wireless communication method of claim 1 , wherein the final TBS is smaller than or equal to a maximum TBS,
wherein the maximum TBS is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters includes at least one of a maximum code block size, a maximum code rate supported by the wireless terminal, a maximum code rate of a modulation and coding scheme (MCS) table, a maximum modulation order supported by the wireless terminal and a maximum modulation order of the MCS table,
wherein the maximum TBS is:
one of elements in a TBS table which is greater than or equal to a product of the maximum code block size and a ratio of the maximum code rate supported by the wireless terminal and the maximum code rate in a configurable modulation and coding scheme (MCS) table, wherein the ratio of the maximum code rate supported by the wireless terminal and the maximum code rate in the configurable MCS table is a value in a range [0.27, 0.7201], and wherein the maximum code block size is equal to 3840 for low-density parity-check (LDPC) base graph 2 and is 8448 for LDPC base graph 1, or
one of elements in a TBS table which is greater than or equal to a product of the maximum code block size and a ratio of the maximum modulation order supported by the wireless terminal and the maximum modulation order in a configurable MCS table, wherein the ratio of the maximum modulation order supported by the wireless terminal and the maximum modulation order in the configurable MCS table is a value in a range [0.25, 1], and wherein the maximum code block size is equal to 3840 for LDPC base graph 2 and 8448 for LDPC base graph 1.
4. The wireless communication method of claim 1 , wherein the final TBS is smaller than or equal to a maximum TBS,
wherein the maximum TBS for a first type of a transmission mode comprises at least one element in a first TBS set and the maximum TBS for a second type of the transmission mode comprises at least one element in a second TBS set,
wherein the transport block is transmitted in:
a physical downlink shared channel, wherein the first TBS set comprises at least one of {1000, 1736, 3752, 3824, 3840, 4008, 5160, 8424, 27376, 51240},
a physical uplink shared channel, wherein the first TBS set comprises at least one of {328, 408, 456, 504, 600, 712, 808, 936, 1000, 1736, 3752, 3824, 3840, 4008, 5160, 8424},
a physical downlink shared channel, wherein the second TBS set comprises at least one of {8424, 15110, 15370, 15620, 15880, 16140, 27376, 50180, 51220}, or
a physical uplink shared channel, wherein the second TBS set comprises at least one of {3824, 5160, 8424, 25100, 27376}, and
wherein:
a value of any element in the first TBS set is smaller than or equal to 5160 and a value of any element in the second TBS set is smaller than or equal to 8848, or
a value of any element in the first TBS set is smaller than or equal to 3840 and a value of any element in the second TBS set is smaller than or equal to 3840.
5. The wireless communication method of claim 1 , wherein the wireless terminal supports LDPC base graph 2, and
wherein the intermediate TBS or the final TBS is smaller than or equal to 3824.
6. The wireless communication method of claim 1 , wherein the at least one event comprises at least one of the intermediate TBS is greater than 3824, the wireless terminal supports LDPC based graph 2, a type of RNTI scrambling a cyclic redundancy check (CRC) of downlink control information (DCI) is a radio network temporary identifier (RNTI) other than the RNTI in Rel-16 NR, or a type of transmission mode is a first type of transmission mode including a maximum modulation order smaller than or equal to 64 quadrature amplitude modulation (QAM),
wherein the specific step comprises using a TBS table to determine a closest TBS that is greater than or equal to the modified TBS, each element in the TBS table is different from all of the elements in TBS table in Rel-16 NR, and each element in the TBS table is divisible by 3816 and a quotient of the element divided by 3816 is larger than 1,
wherein the final TBS is determined by:
final
TBS
=
8
·
C
⌈
N
info
′
+
24
8
·
C
⌉
,
wherein C is determined by
⌈
N
info
′
+
24
3816
⌉
,
wherein ┌ ┐ is a ceiling function, N′ info is the modified TBS and is determined by:
N
info
′
=
max
(
3840
,
2
n
×
round
(
N
info
-
24
2
n
)
)
,
wherein max( ) is a function of acquiring the maximum variable, round ( ) is a function of rounding a variable to the closest integer, N info is the intermediate TBS and n is determined by:
n =└log 2 ( N info −24)┘−5,
wherein └ ┘ is a bottom function.
7. The wireless communication method of claim 1 , wherein a MCS table with transform precoding is used for transmitting the transport block, and
wherein the wireless terminal is configured with a type of transmission mode which is associated with at least one of:
a type of a radio network temporary identifier scrambling a cyclic redundancy check of downlink control information,
a peak data rate for uplink and/or downlink,
a battery life of the wireless terminal,
a modulation order supported by the wireless terminal,
a maximum code rate,
a maximum TBS supported by the wireless terminal,
a maximum number of PRBs associated with a bandwidth configured for a bandwidth part of the wireless terminal,
a target block error rate of transmitting the transport block,
an end-to-end latency supported by the wireless terminal,
a type of frequency range supported by the wireless terminal,
a coverage enhancement capability of the wireless terminal,
a power class of the wireless terminal,
a processing time capability of the wireless terminal,
a use case of the wireless terminal, wherein the use case comprises at least one of an industrial wireless sensor, a video surveillance or a wearable device, or
a duplex mode supported by the wireless terminal.
8. The wireless communication method of claim 1 , wherein a buffer size for low-density parity-check (LDPC) rate matching is determined by a higher layer signaling comprising at least one of:
a maximum bandwidth supported by the wireless terminal,
a number of physical resource blocks PRBs available for the wireless terminal in a bandwidth supported by the wireless terminal,
a maximum number of layers supported by the wireless terminal,
a peak data rate supported by the wireless terminal,
a maximum modulation order supported by the wireless terminal,
a bandwidth part activated for the wireless terminal, or
a type of a radio network temporary identifier scrambling cyclic redundancy check of downlink control information.
9. A wireless communication method for use in a wireless network node, the wireless communication method comprising:
transmitting, to a wireless terminal, a signal indicating a plurality of transmission parameters;
determining an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and the wireless network node based on the plurality of transmission parameters,
modifying the intermediate TBS to generate a modified TBS in response to at least one event, and
determining a final TBS based on the modified TBS and a specific step in response to the at least one event,
wherein the specific step is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters comprises a type of a transmission mode configured for the wireless terminal, and wherein the transmission mode is determined based on one of a user equipment (UE) capability and a UE category,
wherein a number of physical resource blocks (PRBs) in the signal is quantized by a scaling factor which is associated with a bandwidth of a bandwidth part of the wireless terminal.
10. The wireless communication method of claim 9 , wherein the plurality of transmission parameters comprises at least one of:
a downlink control information (DCI) format,
a type of a frequency range,
a type of a radio network temporary identifier (RNTI) scrambling a cyclic redundancy check (CRC) of DCI,
a number of PRBs used to determine the intermediate TBS,
a modulation and coding scheme (MCS) index used to determine a code rate and modulation order,
a coverage capability of the wireless terminal,
a value of sub-carrier spacing, or
a value of an average orthogonal frequency-division multiplexing (OFDM) symbol duration,
wherein the number of physical resource blocks is smaller than or equal to a maximum number of PRBs, wherein the maximum number of PRBs is determined based on at least one of a maximum bandwidth supported by the wireless terminal, the maximum symbols per slot used for data scheduling, and the type of the transmission mode of the wireless terminal, and
wherein the type of the transmission mode of the wireless terminal is associated with at least one of:
the maximum bandwidth supported by the wireless terminal,
a minimum bandwidth supported by the wireless terminal,
a maximum number of layers supported by the wireless terminal,
a maximum number of antenna ports for transmitting the signal,
a peak data rate for uplink and/or downlink supported by the wireless terminal,
a battery life of the wireless terminal,
a modulation order supported by the wireless terminal,
a maximum code rate supported by the wireless terminal,
a maximum TBS supported by the wireless terminal,
a maximum number of PRBs associated with a bandwidth supported by the wireless terminal,
a target block error rate of transmitting the signal,
an end-to-end latency supported by the wireless terminal,
number of frequency range (FR) types supported by the wireless terminal,
a coverage enhancement capability of the wireless terminal,
a power class of the wireless terminal,
a processing time capability of the wireless terminal,
a type of use case of the wireless terminal, wherein the use case comprises at least one of an industrial wireless sensor, a video surveillance or a wearable device, or
a duplex mode of the wireless terminal.
11. The wireless communication method of claim 9 , wherein the final TBS is smaller than or equal to a maximum TBS,
wherein the maximum TBS is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters includes at least one of a maximum code block size, a maximum code rate supported by the wireless terminal, a maximum code rate of a modulation and coding scheme (MCS) table, a maximum modulation order supported by the wireless terminal and a maximum modulation order of the MCS table,
wherein the maximum TBS is:
one of elements in a TBS table which is greater than or equal to a product of the maximum code block size and a ratio of the maximum code rate supported by the wireless terminal and the maximum code rate in a configurable MCS table, wherein the ratio of the maximum code rate supported by the wireless terminal and the maximum code rate in the configurable MCS table is a value in a range [0.27, 0.7201], and wherein the maximum code block size is equal to 3840 for low-density parity-check (LDPC) base graph 2 and is 8448 for LDPC base graph 1, or
one of elements in a TBS table which is greater than or equal to a product of the maximum code block size and a ratio of the maximum modulation order supported by the wireless terminal and the maximum modulation order in a configurable MCS table, wherein the ratio of the maximum modulation order supported by the wireless terminal and the maximum modulation order in the configurable MCS table is a value in a range [0.25, 1], and wherein the maximum code block size is equal to 3840 for LDPC base graph 2 and 8448 for LDPC base graph 1.
12. The wireless communication method of claim 9 , wherein the final TBS is smaller than or equal to a maximum TBS,
wherein the maximum TBS for a first type of a transmission mode comprises at least one element in a first TBS set and the maximum TBS for a second type of the transmission mode comprises at least one element in a second TBS set,
wherein the transport block is transmitted in:
a physical downlink shared channel, wherein the first TBS set comprises at least one of {1000, 1736, 3752, 3824, 3840, 4008, 5160, 8424, 27376, 51240},
a physical uplink shared channel, wherein the first TBS set comprises at least one of {328, 408, 456, 504, 600, 712, 808, 936, 1000, 1736, 3752, 3824, 3840, 4008, 5160, 8424},
a physical downlink shared channel, wherein the second TBS set comprises at least one of {8424, 15110, 15370, 15620, 15880, 16140, 27376, 50180, 51220}, or
a physical uplink shared channel, wherein the second TBS set comprises at least one of {3824, 5160, 8424, 25100, 27376}, and
wherein a value of any element in the first TBS set is:
smaller than or equal to 5160 and a value of any element in the second TBS set is smaller than or equal to 8848, or
smaller than or equal to 3840 and a value of any element in the second TBS set is smaller than or equal to 3840.
13. The wireless communication method of claim 9 , wherein the wireless terminal supports low-density parity-check (LDPC) base graph 2, and
wherein the intermediate TBS or the final TBS is smaller than or equal to 3824.
14. The wireless communication method of claim 9 , wherein the at least one event comprises at least one of the intermediate TBS is greater than 3824, the wireless terminal supports low-density parity-check (LDPC) based graph 2, the type of RNTI scrambling a cyclic redundancy check (CRC) of downlink control information (DCI) is a radio network temporary identifier (RNTI) other than the RNTI in Rel-16 NR, or the type of transmission mode is a first type of transmission mode including a maximum modulation order smaller than or equal to 64 quadrature amplitude modulation (QAM),
wherein the specific step comprises using a TBS table to determine a closest TBS that is greater than or equal to the modified TBS,
wherein each element in the TBS table is different from all of the elements in TBS table in Rel-16 NR, and
wherein each element in the TBS table is divisible by 3816 and a quotient of the element divided by 3816 is larger than 1,
wherein the final TBS is determined by:
final
TBS
=
8
·
C
⌈
N
info
′
+
24
8
·
C
⌉
,
wherein C is determined by
⌈
N
info
′
+
24
3816
⌉
,
wherein ┌ ┐ is a ceiling function, N′ info is the modified TBS and is determined by:
N
info
′
=
max
(
3840
,
2
n
×
round
(
N
info
-
24
2
n
)
)
,
wherein max( ) is a function of acquiring the maximum variable, round ( ) is a function of rounding a variable to the closest integer, N info is the intermediate TBS and n is determined by:
n =└log 2 ( N info −24)┘−5,
wherein └ ┘ is a bottom function.
15. The wireless communication method of claim 9 , wherein a modulation and coding scheme (MCS) table with transform precoding is used for transmitting the transport block, and
wherein the wireless terminal is configured with a type of transmission mode which is associated with at least one of:
a type of a radio network temporary identifier scrambling a cyclic redundancy check of downlink control information,
a peak data rate for uplink and/or downlink,
a battery life of the wireless terminal,
a modulation order supported by the wireless terminal,
a maximum code rate,
a maximum TBS supported by the wireless terminal,
a maximum number of PRBs associated with a bandwidth configured for a bandwidth part of the wireless terminal,
a target block error rate of transmitting the transport block,
an end-to-end latency supported by the wireless terminal,
a type of frequency range supported by the wireless terminal,
a coverage enhancement capability of the wireless terminal,
a power class of the wireless terminal,
a processing time capability of the wireless terminal,
a use case of the wireless terminal, wherein the use case comprises at least one of an industrial wireless sensor, a video surveillance or a wearable device, or
a duplex mode supported by the wireless terminal.
16. The wireless communication method of claim 9 , wherein a buffer size for low-density parity-check (LDPC) rate matching is determined by a higher layer signaling comprising at least one of:
a maximum bandwidth supported by the wireless terminal,
a number of physical resource blocks available for the wireless terminal in a bandwidth supported by the wireless terminal,
a maximum number of layers supported by the wireless terminal,
a peak data rate supported by the wireless terminal,
a maximum modulation order supported by the wireless terminal,
a bandwidth part activated for the wireless terminal, or
a type of a radio network temporary identifier scrambling cyclic redundancy check of downlink control information.
17. A wireless terminal, comprising a processor configured to:
receive, from a wireless network node, a signal indicating a plurality of transmission parameters,
determine an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and the wireless network node based on the plurality of transmission parameters,
modify the intermediate TBS to generate a modified TBS in response to at least one event, and
determine a final TBS based on the modified TBS and a specific step in response to the at least one event,
wherein the specific step is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters comprises a type of a transmission mode configured for the wireless terminal, and wherein the transmission mode is determined based on one of a user equipment (UE) capability and a UE category,
wherein a number of physical resource blocks (PRBs) in the signal is quantized by a scaling factor which is associated with a bandwidth of a bandwidth part of the wireless terminal.
18. A wireless network node, comprising:
a communication unit, configured to transmit, to a wireless terminal, a signal indicating a plurality of transmission parameters, and
a processor, configured to:
determine an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and the wireless network node based on the plurality of transmission parameters,
modify the intermediate TBS to generate a modified TBS in response to at least one event, and
determine a final TBS based on the modified TBS and a specific step in response to the at least one event, and
wherein the specific step is determined based on the plurality of transmission parameters,
wherein the plurality of transmission parameters comprises a type of a transmission mode configured for the wireless terminal, and wherein the transmission mode is determined based on one of a user equipment (UE) capability and a UE category,
wherein a number of physical resource blocks (PRBs) in the signal is quantized by a scaling factor which is associated with a bandwidth of a bandwidth part of the wireless terminal.