CN111263454A - Transmission block size determination method and terminal equipment - Google Patents
Transmission block size determination method and terminal equipment Download PDFInfo
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- CN111263454A CN111263454A CN202010057163.9A CN202010057163A CN111263454A CN 111263454 A CN111263454 A CN 111263454A CN 202010057163 A CN202010057163 A CN 202010057163A CN 111263454 A CN111263454 A CN 111263454A
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Abstract
The invention provides a transmission block size determining method and terminal equipment. The method for determining a Transport Block Size (TBS) includes: determining a number (N ') of REs capable of being used as PSSCH transmission on one PRB in the allocated resources'RE) (ii) a According to number (N'RE) To determine the total number of REs (N) that can be used for PSSCH transmission on all PRBs in the allocated resourceRE) (ii) a According to the determined total number (N)RE) Determining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and determining a TBS for the psch transmission of the side link according to the determined number of bits. By the method for determining the size of the transport block and the terminal equipment, the TBS used for PSSCH transmission of the side link can be determined properly by combining some characteristics of the side link.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for determining a Transport Block Size (TBS) and a terminal device.
Background
Currently, for LTE (Long Term Evolution), the TBS is determined by using a table look-up. Aiming at an NR (New Radio, New air interface) Uu interface, determining the TBS by adopting a mode of combining table look-up and formula calculation. However, for sildelink (also referred to as "side link", "secondary link", "side link", or "through link"), the method of determining the TBS used for its transmission has not been explicitly discussed.
Disclosure of Invention
In view of the above, according to an aspect of the present invention, the present invention provides a transport block size, TBS, determining method for determining a TBS for Sidelink, PSSCH transmission of a side link, where the PSSCH represents a side link physical shared channel, the TBS determining method comprising: determining a number N 'of REs capable of being used as PSSCH transmission on one PRB in the allocated resources'REWhere PRB represents a physical resource block and RE represents a resource element; according to the number N'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE(ii) a According to the determined total number NREDetermining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and determining a TBS for the psch transmission of the side link according to the determined number of bits.
For the TBS determination method, in one possible implementation, the number N 'of REs capable of being used for pscch transmission on one PRB of the allocated resources is determined'REThe method comprises the following steps: according to
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE，
Wherein the content of the first and second substances,
indicates the number of sub-carriers within one PRB,
number of symbols representing a scheduled PSSCH within a slot, an
Indicates the number of REs of the DMRS in one PRB within a scheduling time,
wherein SCI represents a side link control indication, DCI represents a downlink control indication, DMRS represents a demodulation reference signal, PC5-RRC signaling represents radio resource control signaling for a side link, i.e., RRC signaling, and PC5MAC-CE signaling represents medium access control element signaling for a side link, i.e., MAC-CE signaling.
For the TBS determination method described above, in one possible implementation, N 'is calculated according to the following formula'RE：
Wherein X represents a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI.
For the TBS determination method described above, in one possible implementation, the set of values of X is predefined or configured by base station high layer signaling, PC5-RRC signaling, or PC5MAC-CE signaling, and obtained by way of SCI indication or DCI indication.
For the TBS determination method, in one possible implementation, X includes at least one of the following parameters:
and
wherein the content of the first and second substances,
represents the number of REs of a CSI-RS of one PRB,
represents the number of REs occupied by 1st-SCI within one PRB,
indicates the number of REs occupied by the 2nd-SCI within one PRB,
indicates parameters configured through higher layer signaling, an
Indicates the number of REs occupied by the PT-RS within one PRB,
wherein, CSI-RS represents a channel state information reference signal, 1st-SCI represents a first-level SCI, 2nd-SCI represents a second-level SCI, and PT-RS represents a phase tracking reference signal.
For the TBS determination method, in a possible implementation manner, according to the number N'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceREThe method comprises the following steps: judging whether a PSFCH exists in a time slot or not, wherein the PSFCH represents an edge link physical feedback channel; and according to the judgment result and the number N'RETo determine said total number NRE。
For the TBS determination method, in a possible implementation manner, the determination result and the number N 'are determined'RETo determine said total number NREThe method comprises the following steps:
in the case where the PSFCH is present as a result of the judgment, N is determined according to the following formulaRE，
NRE＝min(x,N'RE)×nPRB
In the case where the judgment result is that the PSFCH is not present, N is determined according to the following formulaRE，
NRE＝min(y,N'RE)×nPRB
Wherein x and y are preset values, and nPRBIndicating the number of PRBs in the allocated resource.
For the above TBS determination method, in one possible implementation, determining a TBS for pscch transmission of a side link according to a determined number of bits includes: judging whether the determined bit number is less than or equal to a threshold value; and determining a TBS for pscsch transmission of the side link according to the determination result,
wherein, when the determined bit number is equal to or less than the threshold, determining the TBS for PSSCH transmission of the side link by using a table look-up method, and when the determined bit number is greater than the threshold, determining the TBS for PSSCH transmission of the side link by using a formula calculation method.
According to another aspect of the present invention, a terminal device for determining a Sidelink, TBS for a psch transmission of an edge link, where the psch represents an edge link physical shared channel, comprises: a RE number determination unit for determining the number N 'of REs that can be used for PSSCH transmission on one PRB in the allocated resources'REWhere PRB represents a physical resource block and RE represents a resource element; a RE total number determination unit for determining N 'according to the number'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE(ii) a A bit number determination unit for determining the total number NREDetermining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and a TBS determination unit for determining a TBS for the pscch transmission of the side link according to the determined number of bits.
For the above terminal device, in a possible implementation manner, the RE number determining unit is based on
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE，
Wherein the content of the first and second substances,
indicates the number of sub-carriers within one PRB,
number of symbols representing a scheduled PSSCH within a slot, an
Indicates the number of REs of the DMRS in one PRB within a scheduling time.
Wherein SCI denotes a side link control indication, DCI denotes a downlink control indication, DMRS denotes a demodulation reference signal, PC5-RRC denotes radio resource control signaling for side link, i.e., RRC signaling, and PC5MAC-CE signaling denotes medium access control element signaling for side link, i.e., MAC-CE signaling.
For the terminal device, in a possible implementation manner, the RE number determining unit calculates N 'according to the following formula'RE：
Wherein X represents a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI.
For the terminal device described above, in one possible implementation, the set of values of X is predefined or configured through base station high layer signaling, PC5-RRC signaling, or PC5MAC-CE signaling, and obtained through the manner indicated by SCI or the manner indicated by DCI.
For the terminal device, in a possible implementation manner, X includes at least one of the following parameters:
and
wherein the content of the first and second substances,
represents the number of REs of a CSI-RS of one PRB,
represents the number of REs occupied by 1st-SCI within one PRB,
indicates the number of REs occupied by the 2nd-SCI within one PRB,
indicates parameters configured through higher layer signaling, an
Indicates the number of REs occupied by the PT-RS within one PRB,
wherein, CSI-RS represents a channel state information reference signal, 1st-SCI represents a first-level SCI, 2nd-SCI represents a second-level SCI, and PT-RS represents a phase tracking reference signal.
For the above terminal device, in a possible implementation manner, the unit for determining the total number of REs includes: a first judging module, configured to judge whether a PSFCH exists in a timeslot, where the PSFCH indicates a sidelink physical feedback channel; and the first determining module is used for determining the quantity N 'according to the judgment result of the first judging module'RETo determine said total number NRE。
For the terminal device, in a possible implementation manner, in a case that a determination result of the first determining module is that the PSFCH exists, the first determining module determines N according to the following formulaRE，
NRE＝min(x,N'RE)×nPRB
When the judgment result of the first judgment module is that no PSFCH exists, the first determination module determines N according to the following formulaRE，
NRE＝min(y,N'RE)×nPRB
Wherein x and y are preset values toAnd nPRBIndicating the number of PRBs in the allocated resource.
For the above terminal device, in a possible implementation manner, the TBS determining unit includes: a second judgment module, configured to judge whether the bit number determined by the bit number determination unit is less than or equal to a threshold; and a second determining module for determining the TBS for the psch transmission of the side link according to the determination result of the second determining module,
wherein, when the bit number determined by the bit number determining unit is equal to or smaller than the threshold, the second determining module determines the TBS for the pscch transmission of the side link by using a table lookup, and when the bit number determined by the bit number determining unit is larger than the threshold, the second determining module determines the TBS for the pscch transmission of the side link by using a formula calculation.
Through the TBS determination method and the terminal equipment provided by the embodiment of the invention, the number N 'of REs capable of being used as PSSCH transmission on one PRB in the allocated resources can be determined according to some characteristics of the side link'REAnd determining the total number N of REs that can be used for PSSCH transmission on all PRBs in the allocated resourceRE. Then, the NR Uu interface can be used according to the determined NREThe modulation type, the number of layers, and the coding rate, and determines a TBS for the pscch transmission of the side link based on the determined number of bits. Thus, according to the TBS determination method and the terminal device of the embodiments of the present invention, the TBS used for the pscch transmission of the side link can be appropriately determined in combination with some characteristics of the side link.
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 shows a flow chart of a TBS determination method according to an embodiment of the present invention.
Fig. 2 shows a flow chart of a TBS determination method according to another embodiment of the present invention.
Fig. 3 shows a flow chart of a TBS determination method according to a further embodiment of the present invention.
Fig. 4 shows a block diagram of a terminal device according to an embodiment of the present invention.
Fig. 5 shows a block diagram of a terminal device according to another embodiment of the present invention.
Fig. 6 shows a block diagram of a terminal device according to still another embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, procedures, components, and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
Introduction to the main terms of the invention
TBS (Transport Block Size)
LTE (Long Term Evolution )
NR (New Radio, New air interface)
Sidelink ("Sidelink", "secondary link", "Sidelink", or "straight-through link")
PRB (Physical Resource Block)
PSSCH (Physical Sidelink Shared Channel)
PSCCH (Physical Sidelink Control Channel, side link Physical Control Channel)
RE (Resource Element Resource unit)
PSFCH (Physical Sidelink Feedback Channel)
UE (User Equipment)
BPSK (Binary Phase Shift Keying)
QPSK (Quadrature Phase Shift Keying)
16QAM (Quadrature Amplitude Modulation)
SCI (Sidelink Control indicator)
DCI (Downlink Control indicator)
DMRS (Demodulation Reference Signal)
CDM (Code Division Multiplexing)
MCS (Modulation and Coding Scheme, Modulation and Coding strategy)
PT-RS (Phase Tracking Reference Signal)
MAC-CE (Medium Access Control Element, Medium Access Control Unit)
As described in the background, a method for determining a TBS for transmission of a side link has not been discussed explicitly. In view of the above, the present invention designs a TBS determination method suitable for transmission of the side link in combination with some characteristics of the side link.
Note that the embodiments provided in the embodiments of the present invention may be applied to various communication systems, such as a long term evolution system, a communication system using a 5G communication technology, or an internet of things system, and the present invention is not limited thereto.
The terminal device according to the embodiment of the present invention may include a handheld device, a vehicle-mounted device, a wearable device, a computing device, or other processing devices connected to a wireless modem, which have a wireless communication function, and various forms of User Equipment, a Mobile Station (MS), User Equipment (UE), and the like. For convenience of description, in the present invention, it is referred to as "terminal device" or "user equipment" or "UE".
The base station related to the embodiment of the present invention may be an evolved node B (NodeB, eNB, or e-NodeB) in an LTE system, or a base station device gNB in a fifth Generation mobile communication system (5G, 5th Generation) system, or a base station device etlenb in an LTE system, or a base station device in an internet of things system, and the like. The embodiment of the present invention does not particularly limit the type of the base station.
The TBS determination method and terminal device according to the embodiments of the present invention will be specifically described below. In the following embodiments of the present invention, the terminal device (receiving side (Rx UE) and/or transmitting side (Tx UE)) is mainly used as an execution subject to execute the TBS determination method described later. However, the present invention is not limited to this, and the base station may also execute the TBS determination method described later as an execution subject.
In the following description, the TBS determination method according to the embodiment of the present invention is mainly described by taking psch transmission as an example, however, the present invention is not limited thereto, and the TBS determination method may be applied to other channel scenarios.
Further, in the following embodiments, the same reference numerals denote the same steps or components, and a repetitive description thereof will not be made.
Fig. 1 shows a flow chart of a TBS determination method according to an embodiment of the present invention. As shown in fig. 1, the TBS determination method mainly includes:
step S100, determining the number N 'of REs that can be used as PSSCH transmission on one PRB in the allocated resources'RE；
Step S110, determining the number N'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE；
Step S120, according to the determined total number NREAnd the likeThe type, the number of layers and the coding rate are used for determining the bit number of PSSCH transmission of the side link; and
step S130 determines the TBS for the pscch transmission of the side link according to the determined number of bits.
Specifically, first, the base station allocates resources (for example, bandwidth resources) required for the edge link to the terminal device. Then, in step S100, the terminal device determines the number of REs that can be used for psch transmission with respect to the resources allocated by the base station. Specifically, the terminal equipment determines the number N 'of REs which can be used as PSSCH transmission on one PRB according to one PRB in the allocated resources'RE. Next, in step S110, the terminal device calculates N 'from the result of step S100'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE. Wherein the allocated resource may be a resource allocated for the psch.
Then, in step S120, the terminal device determines N according to the determined NREThe number of bits (bits) used for the PSSCH transmission of the side link is determined by the modulation type (BPSK/QPSK/16QAM), the number of layers (Layer) and the coding Rate (Code Rate). The bit number determination method in step S120 will be specifically described later.
Finally, in step S130, the terminal device determines the TBS for the pscch transmission of the side link according to the determined number of bits. The TBS determination method in step S130 will be described later in detail.
Therefore, according to the TBS determination method of the embodiment of the present invention, a TBS determination method suitable for an edge link can be designed by combining some characteristics of the edge link.
The above-described steps will be specifically described below.
Fig. 2 shows a flow chart of a TBS determination method according to another embodiment of the present invention.
The main difference between this embodiment and the embodiment shown in fig. 1 is that the step S100 may mainly include:
step S1001, according to
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE。
Wherein the content of the first and second substances,
indicates the number of subcarriers within one PRB (e.g.,
)。
That is, by being in N'REMay determine the number of REs N 'that can be used for PSSCH transmission of the side link on one PRB in the allocated resources in combination with characteristics of the side link by adding parameters determined by at least one of base station higher layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE。
In one possible implementation, the parameters determined by at least one of the base station higher layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI may include at least one of the following parameters:
and
wherein the content of the first and second substances,
indicates the number of REs of a CSI-RS, which is a channel state information reference signal, of one PRB. In particular, overhead of the CSI-RS contained in the PSSCH can be accurately estimated, because the indication of the CSI-RS is introduced into the 2nd-SCI or the 1st-SCI, and the CSI-RS occupies the resources of the PSSCH. Therefore, depending on whether CSI-RS is indicated in the 2nd-CSI or not,
different values may be taken. Specifically, in case of no CSI-RS indication in 2nd-CSI,
in other words, for broadcast transmission, there is necessarily no transmission of CSI-RS, and thus for broadcast transmission,
on the other hand, in the case of CSI-RS indication in 2nd-CSI,
i.e. the number of REs of the CSI-RS for one PRB (the number of REs is related to the frequency-domain density of the CSI-RS).
Wherein, 1st-SCI represents a first-level SCI, which may be specifically carried by a PSCCH and may include at least one of the following messages: priority indication information, time frequency resource indication information of PSSCH, MCS indication information and the like; the 2nd-CSI indicates the second-level SCI, which specifically uses the resource or part of the resource of the psch and may contain at least one of the following messages: source ID, destination ID, HARQ (Hybrid Automatic repeat request) process indication information, PSFCH resource indication information, and the like of layer 1.
In addition, the edge link UE needs to decode the first-level SCI and the second-level SCI before it can decode the pscch.
In addition to this, the present invention is,
it can also represent the number of REs occupied by 1st-SCI on average within one PRB. Wherein, assuming that the total occupied RE number of 1st-SCI is m and the allocated PRB number of PSSCH is y, then
The value of (d) is m/y, or ceil (m/y), or floor (m/y), or round (m/y). Where "/" table is divided by, ceil (z) means rounding up z, floor (z) means rounding down zAnd round (z) denotes an operation of taking z as the closest integer.
In particular, the UE may infer through higher layer signaling and/or predefined rules
The numerical value of (c).
In addition to this, the present invention is,
it can also represent the number of REs occupied by 2nd-SCI on average within one PRB. Wherein, assuming that the total occupied RE number of 2nd-SCI is m and the allocated PRB number of PSSCH is y, then
The value of (d) is m/y, or ceil (m/y), or floor (m/y), or round (m/y).
Specifically, the UE may pass higher layer signaling andor
To infer
The numerical value of (c).
In addition to this, the present invention is,
it can also represent the number of REs occupied by PT-RS on average within one PRB. Wherein, assuming that the total occupied RE number of PT-RS is m, and the allocated PRB number of PSSCH is y, then
The value of (d) is m/y, or ceil (m/y), or floor (m/y), or round (m/y).
In one possible implementation, where the parameter determined by at least one of base station higher layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI is represented by X, the number N 'of REs that can be used for PSSCH transmission on one PRB in the allocated resource can be determined by the following formula'RE。
Wherein, in case X comprises different parameters, N'REThe calculation formula of (c) is different.
In one possible implementation, the selectable set of values for X may be predefined or configured by base station higher layer signaling (e.g., RRC signaling or MAC-CE signaling) or configured by PC5-RRC signaling or PC5MAC-CE signaling, and obtained by way of SCI indication or DCI indication. Specifically, a set of values for a specific X may be predefined according to a protocol and then the Rx UE may be informed of the value for the specific X by means of SCI indication and/or the Tx UE may be informed of the value for the specific X by means of DCI indication. In addition, a specific set of values of X may be configured through base station higher layer signaling (e.g., RRC signaling or MAC-CE signaling) or through PC5-RRC signaling or PC5MAC-CE signaling, and then the Rx UE is informed of the specific value of X by means of SCI indication and/or the Tx UE is informed of the specific value of X by means of DCI indication.
As another variation, the value of X may be related to the number of resources allocated by the psch. Specifically, the number of subchannels (subchannels) allocated by the psch or the number of PRBs may uniquely determine a value of X. Wherein, 1 subchannel includes several continuous or discontinuous PRBs.
Specific examples of the above calculation formula will be described below.
In one example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'is calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may compriseAnd
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
In another example, X may comprise
And
in this case, N 'can be calculated by the following formula'RE。
Thus, the number of REs that can be used for pscch transmission of the side link on one PRB can be determined for the allocated resources according to the above calculation formula.
In the above examples, the following are listed
And
as a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI. However, the parameter determined by at least one of the base station higher layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI, and DCI is not limited thereto and may be other parameters as long as the parameter can appropriately reflect the characteristics of the side link.
As a modification, the meaning of the parameters in all the above embodiments may be redefined as follows.
N'REMay indicate the number of REs available for psch transmission in the resource allocated by the psch.
It should be noted that the above redefined parameters are also applicable to the above calculation of N'REThe formulas of (1) are not described in detail herein.
Fig. 3 shows a flow chart of a TBS determination method according to a further embodiment of the present invention.
The TBS determination method of this embodiment is mainly different from the TBS determination method in fig. 2 in that, in the step S110, the following steps may be mainly included:
step S1101, judging whether a PSFCH exists in a time slot, wherein the PSFCH represents a side link physical feedback channel, an
Step S1102, according to the judgment result and the number N'RETo determine the total number NRE。
Specifically, in step S1101, the terminal device (Rx UE or Tx UE) determines whether or not a PSFCH exists in one slot. If the PSFCH is determined to exist, then since the PSFCH needs to occupy some symbols (e.g. 1 or 2 symbols) on the PRB, and there may be Gap symbols and/or agc (automatic gain control) symbols before and after the PSFCH, so that there are fewer symbols available for transmission of the PSSCH. The Gap symbol may be used for switching between Tx UE and Rx UE and/or for beam switching. On the other hand, if it is determined that there is no PSFCH, only 1 or 2 symbols may not be used for transmission of the PSSCH, and these symbols that cannot be used for transmission of the PSSCH may be AGC symbols or Gap symbols. For example, there are typically 14 symbols on a PRB, and in the presence of a PSFCH, the number of symbols typically available for transmission of the PSSCH is at most 8 or 9 (accordingly, the number of REs available for transmission of the PSSCH is 96 or 108), whereas in the absence of a PSFCH, the number of symbols typically available for transmission of the PSSCH is at most 12 or 13 (accordingly, the number of REs available for transmission of the PSSCH is 144 or 156).
Accordingly, in step S1102, in one possible implementation manner, in the case that the PSFCH is present as a result of the determination, N may be calculated by the following formulaRE。
NRE＝min(x,N'RE)×nPRB
On the other hand, in the case where the determination result is that PSFCH is not present, N can be calculated by the following formulaRE。
NRE＝min(y,N'RE)×nPRB
Where x and y are values preset according to the protocol and are, for example, 108 or 96, y is, for example, 156 or 144, and nPRBIndicating the number of PRBs in the allocated resource. Wherein the allocated resource may refer to a resource allocated by the psch.
It should be noted that the value of x is not limited to the above example, and may be other positive integers, such as multiples of 12 in the range of 0 to 156. Also, the value of y is not limited to the above example, and may be other positive integers, such as multiples of 12 in the range of 0 to 156.
In step S110, N may be calculated by the following formulaRE。
NRE＝min(156,N'RE)×nPRBOr NRE＝min(144,N'RE)×nPRB
Wherein 156 or 144 in the above formula can be other positive integers.
Thus, according to the embodiments of the present invention, the number of REs available for psch transmission in all PRBs on the allocated resource can be determined in combination with the characteristics of the side link.
As a modification, nPRBMay represent the number of PRBs allocated by the psch minus the number of PRBs occupied by the first-level SCI. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. For example, the number of PRBs occupied by the first-level SCI may be the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch, ceil (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), floor (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), or round (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch).
As a further modification, nPRBMay represent the number of PRBs allocated by the psch minus the number of PRBs occupied by the first-level SCI and the number of PRBs occupied by the second-level SCI. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. For example, the number of PRBs occupied by the first-level SCI may be the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch, ceil (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), floor (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), or round (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch). The number of PRBs occupied by the second-level SCI can be converted from the number of REs occupied by the second-level SCI to the number of PRBs. For example, the number of PRBs occupied by the second-level SCI may be the number of REs occupied by the second-level SCI divided byThe number of symbols occupied by PSSCH is either ceil (number of REs occupied by second-level SCI divided by the number of symbols occupied by PSSCH), floor (number of REs occupied by second-level SCI divided by the number of symbols occupied by PSSCH), or round (number of REs occupied by second-level SCI divided by the number of symbols occupied by PSSCH).
As a further modification, nPRBMay represent the number of PRBs allocated for the psch minus the number of PRBs occupied by the first-level SCI and the number of PRBs occupied by the PSFCH. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. As an example, the number of PRBs occupied by the first level SCI may be the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH, or ceil (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH), or floor (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH), or round (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH). In addition, the number of PRBs occupied by the PSFCH may be a fixed value, such as 1 or other positive integer.
As a further modification, nPRBMay represent the number of subchannels allocated by the psch multiplied by the number of PRBs contained within one subchannel.
As a further modification, nPRBMay represent the number of subchannels allocated by the psch multiplied by the number of PRBs contained within a subchannel minus the number of PRBs occupied by the first-level SCI. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. As an example, the number of PRBs occupied by the first level SCI may be the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH, or ceil (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH), or floor (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH), or round (the number of symbols occupied by the first level S)The number of REs occupied by CI divided by the number of symbols occupied by pscch).
As a further modification, nPRBMay represent the number of subchannels allocated by the psch multiplied by the number of PRBs contained within a subchannel minus the number of PRBs occupied by the first-level SCI and the number of PRBs occupied by the second-level SCI. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. For example, the number of PRBs occupied by the first-level SCI may be the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch, ceil (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), floor (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch), or round (the number of REs occupied by the first-level SCI divided by the number of symbols occupied by the psch). The number of PRBs occupied by the second-level SCI can be converted from the number of REs occupied by the second-level SCI to the number of PRBs. As an example, the number of PRBs occupied by the second level SCI may be the number of REs occupied by the second level SCI divided by the number of symbols occupied by PSSCH, or ceil (the number of REs occupied by the second level SCI divided by the number of symbols occupied by PSSCH), or floor (the number of REs occupied by the second level SCI divided by the number of symbols occupied by PSSCH), or round (the number of REs occupied by the second level SCI divided by the number of symbols occupied by PSSCH).
As a further modification, nPRBMay represent the number of subchannels allocated by the PSSCH multiplied by the number of PRBs contained within a subchannel minus the number of PRBs occupied by the first-level SCI and the number of PRBs occupied by the PSFCH. The number of PRBs occupied by the first-level SCI may be a fixed value, such as 1 or other natural number or other positive integer; alternatively, the number of PRBs occupied by the first-level SCI is reduced by the number of REs occupied by the first-level SCI. As an example, the number of PRBs occupied by the first level SCI may be the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH, or ceil (the number of REs occupied by the first level SCI divided by the number of symbols occupied by PSSCH), or floor (the number of symbols occupied by the first level SCI)The number of occupied REs divided by the number of symbols occupied by the psch), or round (the number of occupied REs for the first-level SCI divided by the number of symbols occupied by the psch). In addition, the number of PRBs occupied by the PSFCH may be a fixed value, such as 1 or other positive integer.
Further, for the above step S120, the NR Uu interface may be used.
Specifically, the number of bits N for the side link can be obtained by the following formulainfo。
Ninfo＝NRE·R·Qm·υ
Wherein N isREDenotes the total number of REs that can be used for PSSCH transmission on all PRBs in the allocated resource, R denotes the coding rate, QmAnd modulation mode, and v is the number of layers transmitted.
In addition, for the above step S130, the NR Uu interface may be used as well. Specifically, in step S130, the terminal device first determines the determined number of bits NinfoWhether less than or equal to a threshold. The threshold value may be preset according to a protocol, and is 3824, for example. The following description will be given taking 3824 as an example.
At the determined number of bits NinfoWhen the TBS is less than or equal to 3824, a table lookup may be used to determine the TBS for the pscch transmission of the side link.
Specifically, first, one intermediate bit number N 'is calculated using the following formula'info。
Then, from the following Table 1, N 'is found to be less than and most approximate'infoAs the TBS for the pscch transmission of the side link.
TABLE 1
On the other hand, in the case that the determined bit number is greater than 3824, the TBS for the side link may be determined in a manner of formula calculation.
Specifically, one intermediate bit number N 'is calculated using the following formula'info。
If R ≦ 1/4, where R represents the coding rate:
If R is>1/4 and N'info> 8424, then:
Otherwise:
thus, the manner of NR Uu can be followed to determine the TBS for the side link.
Therefore, by the TBS determination method of the embodiment of the invention, the number N 'of REs capable of being used as PSSCH transmission on one PRB in the allocated resources can be determined according to some characteristics of the side link'REAnd determining among the allocated resourcesTotal number of REs N on all PRBs that can be used for PSSCH transmissionRE. Then, the NR Uu interface can be used according to the determined NREThe modulation type, the number of layers, and the coding rate, and determines a TBS for the pscch transmission of the side link based on the determined number of bits. Thus, according to the TBS determination method of the embodiment of the present invention, the TBS used for the pscch transmission of the side link can be appropriately determined in combination with some characteristics of the side link.
As one of the transmission types of the edge link, a transmission scheme based on resource reservation (resource reservation) is a scheme of transmitting resources by reserving them a plurality of times at a time. At this time, in order to ensure that the calculated TBS is the same result between multiple transmissions, the following approach may be used.
As an example, it may be assumed that transmissions of CSI-RS and/or PT-RS are always present. Or, as long as the transmission of the CSI-RS and/or the PT-RS is transmitted for the first time, the transmission of the CSI-RS and/or the PT-RS is assumed in the following resource reservation transmission. Or, as long as there is transmission of CSI-RS and/or PT-RS for one transmission among several transmissions of resource reservation, it is assumed that there is transmission of CSI-RS and/or PT-RS for all or all of the following resource reservation transmissions.
As another example, it may be assumed that the PSFCH always occurs in the time slot in which each transmission of the resource reservation occurs. Alternatively, as long as the first transmission has a transmission of the PSFCH, the slot in which the next resource reservation transmission is located always assumes the transmission of the PSFCH. Alternatively, as long as there is one transmission of PSFCH in the time slot in which several transmissions of the resource reservation are located, it is assumed that there is always transmission of PSFCH in the time slot in which all or all of the following resource reservation transmissions are located.
As another example, it may be assumed that the number of REs or the number of PRBs of the first-level SCI is the same in each transmission of the resource reservation. Specifically, the one with the highest number of REs or PRBs of the first-level SCI in several transmissions of resource reservation may be selected as the unified assumption. Alternatively, the uniform assumption may be selected that the number of REs or PRBs of the first-level SCI is the smallest among several transmissions of resource reservation. The number of REs or the number of PRBs of the first-level SCI corresponding to the first transmission of the several transmissions of resource reservation may be selected as a uniform assumption.
As another example, it may be assumed that the number of REs or the number of PRBs of the second-level SCI is the same in each transmission of the resource reservation. In particular, the highest number of REs or PRBs of the second level SCI over several transmissions of resource reservation may be selected as a uniform assumption. Alternatively, the one with the least number of REs or PRBs of the second level SCI in several transmissions of resource reservation may be selected as the unified assumption. The number of REs or the number of PRBs of the second-level SCI corresponding to the first transmission of the several transmissions of resource reservation may be selected as a uniform assumption.
As another example, the terminal may control the number of occupied OFDM symbols per resource reservation transmission to be consistent when performing resource reservation transmission. In particular, all resource reservation transmissions may be made with reference to the smallest number of OFDM symbols available at one time in the resource reservation transmission. For example, there are 4 resource reservation transmissions, 1 resource reservation transmission because there is a PSFCH in the slot and only 5 OFDM symbols can be used for side link transmission, and other 3 resource reservation transmissions because there is no PSFCH in the slot and more symbols can be used for side link transmission, for example, 9 symbols. Then, at this time, the terminal needs to adopt 5 OFDM symbols or at most 5 OFDM symbols for side link transmission when performing the 4 resource reservation transmissions.
As one of the transmission types of the side link, a transmission scheme based on blind retransmission (blind retransmission) is a scheme in which multiple repeated transmissions can be directly performed without depending on HARQ-ACK feedback. At this time, in order to ensure that the calculated TBS is the same result between multiple transmissions, there may be the following:
as an example, it may be assumed that transmissions of CSI-RS and/or PT-RS are always present. Or, as long as the first transmission is the transmission of the CSI-RS and/or the PT-RS, the transmission of the CSI-RS and/or the PT-RS is assumed in the following blind retransmission. Or, as long as there is a transmission of CSI-RS and/or PT-RS in a transmission of several blind retransmissions, it is assumed that there is a transmission of CSI-RS and/or PT-RS in all or all of the following blind retransmission transmissions.
As another example, it may be assumed that the PSFCH always occurs in the time slot in which each transmission of the blind retransmission occurs. Alternatively, as long as the first transmission has a transmission of the PSFCH, the following blind retransmission is always assumed to have a transmission of the PSFCH in the slot. Alternatively, as long as there is a transmission of PSFCH in a time slot in which several transmissions of a blind retransmission are located, it is assumed that there is always a transmission of PSFCH in the time slot in which all or all of the following blind retransmissions are located.
As another example, it may be assumed that the number of REs or the number of PRBs of the first level SCI is the same in each transmission of the blind retransmission. Specifically, the highest number of REs or PRBs of the first level SCI in several transmissions of blind retransmission may be selected as the unified assumption. Alternatively, the uniform assumption may be selected that the number of REs or PRBs of the first level SCI is the smallest in several transmissions of blind retransmissions. The number of REs or the number of PRBs of the first-level SCI corresponding to the first transmission of several transmissions of blind retransmissions may be selected as a uniform assumption.
As another example, it may be assumed that the number of REs or PRBs of the second level SCI is the same in each transmission of a blind retransmission. Specifically, the highest number of REs or PRBs of the second level SCI in several transmissions of blind retransmissions may be selected as the unified assumption. Alternatively, the uniform assumption may be selected that the number of REs or PRBs of the second level SCI is the smallest in several transmissions of blind retransmissions. The number of REs or the number of PRBs of the second-level SCI corresponding to the first transmission of several transmissions of blind retransmissions may be selected as a uniform assumption.
As another example, when the terminal performs blind retransmission, the terminal may control the occupied number of OFDM symbols per blind retransmission to be consistent. In particular, all blind retransmissions can be made with reference to the least number of once available OFDM symbols in the blind retransmission. For example, there are 4 blind retransmissions, 1 blind retransmission because there is a PSFCH in the slot where only 5 OFDM symbols can be used for side link transmission, and other 3 blind retransmissions because there is no PSFCH in the slot where more symbols can be used for side link transmission, such as 9 symbols. Then, the terminal needs to use 5 OFDM symbols or at most 5 OFDM symbols for side link transmission when performing the 4 blind retransmissions.
A terminal device according to an embodiment of the present invention will be described below.
Fig. 4 shows a block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 40 is configured to determine Sidelink, i.e. TBS of psch transmission of a side link, where the psch represents a side link physical shared channel, and the terminal device 40 includes: RE number determination unit 41 for determining the number N 'of REs that can be used for PSSCH transmission on one PRB in the allocated resources'REWhere PRB represents a physical resource block and RE represents a resource element; a RE total number determination unit 42 for determining N 'according to the number'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE(ii) a A bit number determination unit 43 for determining the total number NREDetermining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and a TBS determination unit 44 for determining a TBS for the pscch transmission of the side link according to the determined number of bits.
For the terminal device 40, in a possible implementation manner, the RE number determining unit 41 is based on
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE，
Wherein the content of the first and second substances,
indicates the number of sub-carriers within one PRB,
number of symbols representing a scheduled PSSCH within a slot, an
Indicates the number of REs of the DMRS in one PRB within a scheduling time.
Wherein SCI denotes a side link control indication, DCI denotes a downlink control indication, DMRS denotes a demodulation reference signal, PC5-RRC denotes radio resource control signaling for side link, i.e., RRC signaling, and PC5MAC-CE signaling denotes medium access control element signaling for side link, i.e., MAC-CE signaling.
For the terminal device 40, in one possible implementation manner, the RE number determining unit 41 calculates N 'according to the following formula'RE：
Wherein X represents a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI.
For the terminal device 40 described above, in one possible implementation, the value set of X is predefined or configured through base station high layer signaling, PC5-RRC signaling, or PC5MAC-CE signaling, and obtained through the SCI indication manner or the DCI indication manner.
For the terminal device 40 described above, in one possible implementation, X includes at least one of the following parameters:
and
wherein the content of the first and second substances,
represents the number of REs of a CSI-RS of one PRB,
represents the number of REs occupied by 1st-SCI within one PRB,
indicates the number of REs occupied by the 2nd-SCI within one PRB,
indicates parameters configured through higher layer signaling, an
Indicates the number of REs occupied by the PT-RS within one PRB,
wherein, CSI-RS represents a channel state information reference signal, 1st-SCI represents a first-level SCI, 2nd-SCI represents a second-level SCI, and PT-RS represents a phase tracking reference signal.
The terminal device 40 of this embodiment may be configured to perform the TBS determination method set forth in any of the above embodiments. For the specific process of the TBS determination method, refer to the detailed description of the above embodiments.
According to the terminal equipment of the embodiment of the invention, the number N 'of the REs capable of being used as PSSCH transmission on one PRB in the allocated resources can be determined according to some characteristics of the side link'REAnd determining the total number N of REs that can be used for PSSCH transmission on all PRBs in the allocated resourceRE. Then, the NR Uu interface can be used according to the determined NREThe modulation type, the number of layers, and the coding rate, and determines a TBS for the pscch transmission of the side link based on the determined number of bits. Thus, according to the terminal device of the embodiment of the present invention, the TBS for the pscch transmission of the side link can be appropriately determined in combination with some characteristics of the side link.
Fig. 5 shows a block diagram of a terminal device according to another embodiment of the present invention. As shown in fig. 5, the terminal device 50 of fig. 5 mainly differs from the terminal device 40 of fig. 4 in that the RE total number determination unit 42 includes: a first determining module 421, configured to determine whether a PSFCH exists in a timeslot, where the PSFCH indicates a sidelink physical feedback channel; and a first determination module 422 for determining whether to make a first determination based on the first determinationJudgment result of module 421 and the number N'RETo determine said total number NRE。
For the terminal device 50, in a possible implementation manner, in a case that the determination result of the first determining module 421 is that there is a PSFCH, the first determining module 422 determines N according to the following formulaRE，
NRE＝min(x,N'RE)×nPRB
When the determination result of the first determining module 421 is that there is no PSFCH, the first determining module 422 determines N according to the following formulaRE，
NRE＝min(y,N'RE)×nPRB
Wherein x and y are preset values, and nPRBIndicating the number of PRBs in the allocated resource.
The terminal device 50 of this embodiment may be configured to perform the TBS determination method set forth in any of the above embodiments. For the specific process of the TBS determination method, refer to the detailed description of the above embodiments.
According to the terminal equipment of the embodiment of the invention, the TBS of PSSCH transmission of the side link can be properly determined by combining some characteristics of the side link.
Fig. 6 shows a block diagram of a terminal device according to still another embodiment of the present invention. As shown in fig. 6, the terminal device 60 of fig. 6 mainly differs from the terminal device 50 of fig. 5 in that the TBS determination unit 44 includes: a second judging module 441 configured to judge whether the bit number determined by the bit number determining unit 43 is less than or equal to a threshold; and a second determining module 442, configured to determine the TBS for pscch transmission of the side link according to the determination result of the second determining module 441,
wherein, when the bit number determined by the bit number determining unit 43 is equal to or smaller than the threshold, the second determining module 442 determines the TBS for the pscch transmission of the side link by using a table lookup, and when the bit number determined by the bit number determining unit 43 is larger than the threshold, the second determining module 442 determines the TBS for the pscch transmission of the side link by using a formula calculation.
The terminal device 60 of this embodiment may be configured to perform the TBS determination method set forth in any of the above embodiments. For the specific process of the TBS determination method, refer to the detailed description of the above embodiments.
Thus, according to the terminal device of the embodiment of the present invention, the TBS for the pscch transmission of the side link can be appropriately determined in combination with some characteristics of the side link.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (16)
1. A method for transport block size, TBS, determination, wherein the TBS determination is configured to determine a TBS for a Sidelink, PSSCH transmission, wherein the PSSCH represents an Sidelink physical shared channel, the method comprising:
determining a number N 'of REs capable of being used as PSSCH transmission on one PRB in the allocated resources'REWhere PRB represents a physical resource block and RE represents a resource element;
according to the number N'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE；
According to the determined total number NREDetermining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and
the TBS for the psch transmission of the side link is determined according to the determined number of bits.
2. The TBS determination method of claim 1, wherein the number N 'of REs capable of being used for pscch transmission on one PRB in the allocated resource is determined'REThe method comprises the following steps:
according to
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE，
Wherein the content of the first and second substances,
indicates the number of sub-carriers within one PRB,
number of symbols representing a scheduled PSSCH within a slot, an
Indicates the number of REs of the DMRS in one PRB within a scheduling time,
wherein SCI represents a side link control indication, DCI represents a downlink control indication, DMRS represents a demodulation reference signal, PC5-RRC signaling represents radio resource control signaling for a side link, i.e., RRC signaling, and PC5MAC-CE signaling represents medium access control element signaling for a side link, i.e., MAC-CE signaling.
3. The method of TBS determination of claim 2, wherein N 'is calculated according to the following formula'RE：
Wherein X represents a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI.
4. The TBS determination method of claim 3, wherein the set of values of X is predefined or configured by base station high layer signaling, PC5-RRC signaling or PC5MAC-CE signaling and is obtained by way of SCI indication or DCI indication.
5. The method of claim 3, wherein X comprises at least one of the following parameters:
and
wherein the content of the first and second substances,
represents the number of REs of a CSI-RS of one PRB,
represents the number of REs occupied by 1st-SCI within one PRB,
indicates the number of REs occupied by the 2nd-SCI within one PRB,
indicates parameters configured through higher layer signaling, an
Indicates the number of REs occupied by the PT-RS within one PRB,
wherein, CSI-RS represents a channel state information reference signal, 1st-SCI represents a first-level SCI, 2nd-SCI represents a second-level SCI, and PT-RS represents a phase tracking reference signal.
6. According to claim1 to 5, wherein said method for determining TBS is based on said number N'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceREThe method comprises the following steps:
judging whether a PSFCH exists in a time slot or not, wherein the PSFCH represents an edge link physical feedback channel; and
according to a judgment result and the number N'RETo determine said total number NRE。
7. The method of claim 6, wherein the TBS determination method is performed according to a determination result and the number N'RETo determine said total number NREThe method comprises the following steps:
in the case where the PSFCH is present as a result of the judgment, N is determined according to the following formulaRE，
NRE＝min(x,N'RE)×nPRB
In the case where the judgment result is that the PSFCH is not present, N is determined according to the following formulaRE，
NRE＝min(y,N'RE)×nPRB
Wherein x and y are preset values, and nPRBIndicating the number of PRBs in the allocated resource.
8. The TBS determination method of claim 1, wherein determining the TBS for the psch transmission for the side link based on the determined number of bits comprises:
judging whether the determined bit number is less than or equal to a threshold value; and
determining a TBS for pscch transmission of the side link according to the determination result,
wherein, in case the determined number of bits is equal to or less than the threshold, the TBS for PSSCH transmission of the side link is determined in a table look-up manner, an
And determining the TBS for PSSCH transmission of the side link by adopting a formula calculation mode under the condition that the determined bit number is larger than the threshold value.
9. A terminal device configured to determine a Sidelink, TBS, PSSCH transmission for an edge link, wherein the PSSCH represents an edge link physical shared channel, the terminal device comprising:
a RE number determination unit for determining the number N 'of REs that can be used for PSSCH transmission on one PRB in the allocated resources'REWhere PRB represents a physical resource block and RE represents a resource element;
a RE total number determination unit for determining N 'according to the number'RETo determine the total number of REs N that can be used for PSSCH transmission on all PRBs in the allocated resourceRE；
A bit number determination unit for determining the total number NREDetermining the bit number used for PSSCH transmission of the side link according to the modulation type, the layer number and the coding rate; and
a TBS determination unit for determining a TBS for PSSCH transmission of the side link according to the determined number of bits.
10. The terminal device of claim 9, wherein the RE number determination unit is based on
And determining N 'through parameters determined by at least one of base station high-layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI'RE，
Wherein the content of the first and second substances,
indicates the number of sub-carriers within one PRB,
number of symbols representing a scheduled PSSCH within a slot, an
Indicates the number of REs of the DMRS in one PRB within a scheduling time,
wherein SCI denotes a side link control indication, DCI denotes a downlink control indication, DMRS denotes a demodulation reference signal, PC5-RRC denotes radio resource control signaling for side link, i.e., RRC signaling, and PC5MAC-CE signaling denotes medium access control element signaling for side link, i.e., MAC-CE signaling.
11. The terminal device according to claim 10, wherein the RE number determination unit calculates N 'according to the following formula'RE：
Wherein X represents a parameter determined by at least one of base station high layer signaling, PC5-RRC signaling, PC5MAC-CE signaling, SCI and DCI.
12. The terminal device of claim 11, wherein the set of values for X is predefined or configured by base station high layer signaling, PC5-RRC signaling, or PC5MAC-CE signaling and is obtained by way of SCI indication or DCI indication.
13. The terminal device of claim 11, wherein X comprises at least one of the following parameters:
and
wherein the content of the first and second substances,
represents the number of REs of a CSI-RS of one PRB,
represents the number of REs occupied by 1st-SCI within one PRB,
indicates the number of REs occupied by the 2nd-SCI within one PRB,
indicates parameters configured through higher layer signaling, an
Indicates the number of REs occupied by the PT-RS within one PRB,
wherein, CSI-RS represents a channel state information reference signal, 1st-SCI represents a first-level SCI, 2nd-SCI represents a second-level SCI, and PT-RS represents a phase tracking reference signal.
14. The terminal device according to any of claims 9 to 13, wherein the RE total number determining unit comprises:
a first judging module, configured to judge whether a PSFCH exists in a timeslot, where the PSFCH indicates a sidelink physical feedback channel; and
a first determining module, configured to determine the quantity N 'according to the determination result of the first determining module'RETo determine said total number NRE。
15. The terminal device of claim 14,
when the judgment result of the first judgment module is that the PSFCH exists, the first determination module determines N according to the following formulaRE，
NRE＝min(x,N'RE)×nPRB
When the judgment result of the first judgment module is that no PSFCH exists, the first determination module determines N according to the following formulaRE，
NRE＝min(y,N'RE)×nPRB
Wherein x and y are preset values, and nPRBIndicating the number of PRBs in the allocated resource.
16. The terminal device of claim 9, wherein the TBS determination unit comprises:
a second judgment module, configured to judge whether the bit number determined by the bit number determination unit is less than or equal to a threshold; and
a second determining module for determining a TBS for PSSCH transmission of the side link according to a determination result of the second determining module,
wherein the second determining module determines the TBS for PSSCH transmission of the side link by using a table look-up under the condition that the bit number determined by the bit number determining unit is equal to or smaller than the threshold value, an
The second determining module determines the TBS for the psch transmission of the side link in a formula calculation manner when the bit number determined by the bit number determining unit is greater than the threshold.
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