Communication method and device, storage medium and program product

Abstract

The invention discloses a communication method and device, a storage medium and a program product. The method comprises the following steps: a terminal and network equipment determine L candidate PDSCH positions on a first resource set according to the number X of carrier units in a time unit; the network equipment sends the PDSCH at the L candidate PDSCH positions; and the terminal sends an HARQ codebook to the network device, the HARQ codebook comprising Y HARQ information bits, and Y > = L. By adopting the scheme of the invention, the HARQ codebook is prevented from comprising excessive redundant bits, and the load of uplink control information is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and particularly relates to a communication method and device, a storage medium and a program product. BACKGROUND

[0002] Carrier aggregation (CA) refers to aggregating multiple component carriers (CCs) together, which can improve the peak rate of a terminal.

[0003] Hybrid automatic repeat request (HARQ) is a mechanism combining forward error correction (FEC) and automatic repeat request (ARQ) of error data units. A terminal can multiplex the HARQ information of multiple transmission blocks (TBs) together for feedback, and the multiple bits of HARQ information corresponding to the multiple TBs are referred to as one HARQ codebook.

[0004] When a terminal generates a HARQ codebook, one way is to determine a time unit set according to a value set of a time interval from a time slot where a physical downlink shared channel (PDSCH) is located to a time slot where a physical uplink control channel (PUCCH) is located, and in the frequency domain, to start from the lowest CC among all CCs, to traverse the time unit set in the time domain for each CC, to determine a candidate PDSCH position on the CC, and to traverse all CCs to obtain candidate PDSCH positions in all CCs. Each candidate PDSCH position corresponds to 1 bit or multiple bits in the HARQ codebook, which is used to feed back a PDSCH possibly received at the candidate PDSCH position.

[0005] However, in some cases, for example, when not all bits in the HARQ codebook are useful, there is a problem of redundancy of the bits in the HARQ codebook. SUMMARY

[0006] The present application provides a communication method and device, a storage medium and a program product to reduce the redundancy of a HARQ codebook.

[0007] In a first aspect, a communication method is provided. Exemplarily, the method can be applied to a terminal side, e.g., the method can be performed by a terminal, or performed by a module (e.g., a processor, a chip, a chip system, a circuit, etc.) in the terminal. The module can be a communication module in the terminal, or a circuit or chip responsible for communication functions in the terminal, such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core.

[0008] The method comprises: determining L candidate PDSCH positions on a first resource set according to a number X of carrier units in one time unit, the first resource set comprising M time units and N carrier units, X, L, M, N are positive integers, and X≤N; receiving a PDSCH at the L candidate PDSCH positions; and transmitting a HARQ codebook, the HARQ codebook comprising Y HARQ information bits, the HARQ information bits being used to indicate whether the PDSCH is successfully received, Y being a positive integer, and Y≥L.

[0009] Exemplarily, in this application, the number X of carrier units in one time unit can also be replaced by X carrier units in one time unit. The terminal can determine the candidate PDSCH positions based on the number X of carrier units or based on the X carrier units.

[0010] The first resource set comprising M time units and N carrier units can be replaced by a second resource set comprising M time units and X carrier units. Among them, the X carrier units are carrier units in the N carrier units (or the X carrier units are located in the N carrier units).

[0011] By using the method, the terminal and the network device determine the candidate PDSCH positions according to the number X of the carrier units for receiving the downlink signals in a time unit or according to the carrier units for receiving the downlink signals in a time unit, that is, when the terminal determines the L candidate PDSCH positions in the first resource set, the terminal determines the candidate PDSCH positions in each of the X carrier units in the N carrier units, and does not determine the candidate PDSCH positions in the carrier units outside the X carrier units in the N carrier units. Compared with determining the candidate PDSCH positions in each of the N carrier units, the number of the carrier units for determining the candidate PDSCH positions by the terminal is reduced, the number of the candidate PDSCH positions determined by the terminal is reduced, the HARQ codebook is generated by the terminal based on the L candidate PDSCH positions, one candidate PDSCH position corresponds to one (or more) HARQ bit, and the number of the bits included in the HARQ codebook is also reduced, which avoids including too many redundant bits in the HARQ codebook and reduces the load of the uplink control information.

[0012] With reference to the first aspect, in a possible design, the X carrier units are carrier units for receiving the downlink signals, and the X carrier units are carrier units in the N carrier units.

[0013] With reference to the first aspect, in a possible design, the X carrier units are carrier units for generating the HARQ codebook.

[0014] With reference to the first aspect, in another possible design, the N carrier units are configured by the network device.

[0015] With reference to the first aspect, in another possible design, the N is greater than or equal to the number of the carrier units configured by the network device.

[0016] With reference to the first aspect, in another possible design, the N carrier units are N downlink carrier units configured by the network device.

[0017] With reference to the first aspect, in another possible design, the N carrier units are N downlink carrier units configured by the network device, and the number of the uplink carrier units configured by the network device is less than or equal to N.

[0018] With reference to the first aspect, in another possible design, the N carrier units are activated carrier units. The terminal can receive in each of the N carrier units, but due to the limited downlink processing capability of the terminal, the terminal can only receive the downlink signals on the X carrier units.

[0019] With reference to the first aspect, in a possible design of the first aspect, the Y HARQ information bits are determined based on the L candidate PDSCH locations.

[0020] With reference to the first aspect, in another possible design of the first aspect, the method further includes: transmitting first information, where the first information indicates a maximum number W of carrier units in a time unit for receiving a downlink signal, X≤W, and / or the first information indicates at least one group of downlink carrier units, a number of downlink carrier units in the at least one group of downlink carrier units is less than or equal to the W, and the X is determined based on the at least one group of downlink carrier units; and the first information is capability information of the terminal.

[0021] With reference to the first aspect, in another possible design of the first aspect, the method further includes: receiving second information from the network device, where the second information indicates the X and / or at least one group of downlink carrier units, a number of different downlink carrier units in the at least one group of downlink carrier units is X, or a number of downlink carrier units in the at least one group of downlink carrier units is less than or equal to the X, or the X carrier units.

[0022] With reference to the first aspect, in yet another possible design of the first aspect, the method further includes: determining the L candidate PDSCH locations based on candidate PDSCH locations on the X carrier units.

[0023] With this design, the terminal determines the L candidate PDSCH locations as the candidate PDSCH locations on the X carrier units, the L candidate PDSCH locations do not include candidate PDSCH locations on carrier units other than the X carrier units in the N carrier units, one candidate PDSCH location corresponds to 1 bit (or multiple bits), the number of candidate PDSCH locations is reduced, and the number of HARQ bits included in the HARQ codebook is also reduced accordingly, which avoids including too many redundant bits in the HARQ codebook and reduces the load of uplink control information.

[0024] With reference to the first aspect, in yet another possible design of the first aspect, determining the L candidate PDSCH locations based on the X carrier units in a time unit and on the first resource set includes: determining the L candidate PDSCH locations in a sequence of first traversing the X carrier units and then traversing the M time units.

[0025] With reference to the first aspect, in a possible design of the determining the L candidate PDSCH locations on the first set of resources according to the number X of the carrier components in one time unit, the determining the L candidate PDSCH locations includes: determining the candidate PDSCH locations in the X carrier components in a time unit with the smallest index among the M time units, and determining the candidate PDSCH locations on the X carrier components in each of the M time units in ascending order of the indices of the M time units, to obtain the L candidate PDSCH locations.

[0026] With this design, in the order of first traversing the frequency domain resources and then traversing the time domain resources (first traversing the carrier components in each time unit and then traversing the time units), if the order of first traversing the time domain resources and then traversing the frequency domain resources is to be adopted, the network device and the terminal can make a mistake in understanding the HARQ codebook when the carrier components used for receiving the downlink signals in different time units are switched. Since the upper limit of the number of the carrier components used for receiving the downlink signals in each time unit is determined, the number of the corresponding HARQ bits in each time unit is fixed. The mistake in understanding the mapping relationship between the HARQ information and the carrier components caused by the PDCCH miss detection in one time unit does not affect another time unit. Thus, the probability of misunderstanding between the network device and the terminal is reduced, and the robustness of the HARQ codebook is improved.

[0027] With reference to the first aspect, in a possible design of the determining the L candidate PDSCH locations on the first set of resources according to the number X of the carrier components in one time unit, the X carrier components are X carrier components with the largest number of candidate PDSCH locations among the N carrier components, and X≤N.

[0028] With this design, in the scenario where the carrier components can be dynamically switched, the number of the candidate PDSCH locations in the N carrier components in one time unit (the number of reserved bits) can be determined according to the X carrier components with the largest number of candidate PDSCH locations among the N carrier components. The number of the candidate PDSCH locations corresponding to the actually scheduled CCs can be less than the determined number of the candidate PDSCH locations, so that the terminal can have feedback resources for HARQ feedback.

[0029] With reference to the first aspect, in a possible design of the determining the L candidate PDSCH locations on the first set of resources according to the number X of the carrier components in one time unit, the X carrier components are X carrier components with the largest number of candidate PDSCH locations among the N carrier components, and X≤N.

[0030] Exemplarily, in this application, the i th bit in the N bits indicates whether the terminal receives PDSCH on the i th carrier unit in the N carrier units can also be replaced by the i th bit in the N bits indicating whether the i th carrier unit in the N carrier units is a carrier unit for the terminal to receive downlink signals. The downlink signals can include at least one of the following: control information (PDCCH), data information (PDSCH), reference signal, synchronization information, beam information. The terminal does not necessarily receive signals on the carrier unit for receiving downlink signals, whether to receive signals depends on the scheduling of the network device. But in the carrier unit not used for receiving downlink signals, the terminal will not receive the downlink signals on the carrier unit.

[0031] It can be understood that "receiving downlink signals" in this application can be "receiving downlink data and / or information". For example, it is emphasized here that "the i th bit in the N bits indicates whether the terminal receives on the i th carrier unit in the N carrier units", without limiting the content of the reception.

[0032] With this design, in the CA scenario, the terminal receives DCI, which can indicate whether to receive downlink signals on other carrier units, so that the terminal can explicitly detect and receive signals on the carrier unit, even if the terminal misses the DCI indicating the carrier unit switching, it can also accurately receive PDSCH in the carrier unit, thereby improving the reliability of communication.

[0033] In combination with the first aspect, in yet another possible design, the method further includes: receiving DCI in the first time unit and the first carrier unit, the DCI being used for scheduling downlink signals; wherein the DCI includes a bit map, the bit map including N bits, the i th bit in the N bits indicating whether the terminal receives downlink signals on the i th carrier unit in the N carrier units in the first time unit, where 0≤i≤N-1 or 1≤i≤N.

[0034] Exemplarily, in this application, the i th bit in the N bits indicates whether the terminal receives a downlink signal on the i th carrier unit in the N carrier units within the first time unit, which can be replaced by that the i th bit in the N bits indicates whether the i th carrier unit in the N carrier units is a carrier unit for the terminal to receive a downlink signal within the first time unit. The downlink signal can include at least one of the following: control information (PDCCH), data information (PDSCH), reference signal, synchronization information, beam information. The terminal does not necessarily receive a signal on the carrier unit for receiving a downlink signal, and whether to receive a signal depends on the scheduling of the base station. But in the carrier unit not used for receiving a downlink signal, the terminal will not receive a downlink signal on the carrier unit.

[0035] In combination with the first aspect, in yet another possible design, the method further includes: receiving a DCI within the first carrier unit, the DCI including second information, the second information indicating that the terminal receives a downlink signal on a j th carrier unit in the N carrier units other than the first carrier unit within the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0036] Exemplarily, in this application, the second information indicating that the terminal receives a downlink signal on a j th carrier unit in the N carrier units other than the first carrier unit can be replaced by the second information indicating that the j th carrier unit in the N carrier units other than the first carrier unit is a carrier unit for the terminal to receive a downlink signal.

[0037] With this design, in the CA scenario, the terminal receives a DCI, which indicates whether to receive a downlink signal on other carrier units through cross indication, which ensures that the terminal can also explicitly determine its carrier unit for receiving a downlink signal in the case of missing a DCI, that is, even if the terminal does not receive its own DCI on other carrier units, it can also accurately receive a downlink signal on other carrier units, thereby improving the reliability of communication.

[0038] In combination with the first aspect, in yet another possible design, the method further includes: receiving a DCI within the first time unit and the first carrier unit, the DCI including second information, the second information indicating that the terminal receives a downlink signal on a j th carrier unit in the N carrier units other than the first carrier unit within the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0039] Exemplarily, in this application, the second information indicates that the terminal receives the downlink signal on the jth carrier frequency unit of the N carrier frequency units except the first carrier frequency unit in the first time unit. Alternatively, the second information indicates that the jth carrier frequency unit of the N carrier frequency units except the first carrier frequency unit is the carrier frequency unit for the terminal to receive the downlink signal in the first time unit.

[0040] With reference to the first aspect, in a further possible design of the method, the method further includes: receiving a DCI in the first carrier frequency unit, where the DCI includes third information, and the third information indicates that the first carrier frequency unit is the kth carrier frequency unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X.

[0041] With reference to the first aspect, in a further possible design of the method, the method further includes: receiving a DCI in the first carrier frequency unit, where the DCI includes third information, and the third information indicates that the first carrier frequency unit is the kth carrier frequency unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X.

[0042] With this design, the DCI sent by the network device carries the indication information, which is used to indicate the carrier frequency unit for the terminal to receive the downlink signal in a time unit. The terminal can know which carrier frequency units it should receive signals or channels in. Due to the channel quality or other reasons, the terminal may miss the DCI, which can cause that the network device sends a signal but the terminal fails to receive the signal successfully, and the terminal is not clear about which carrier frequency unit the network device sends the signal in, thereby causing the understanding confusion between the network device and the terminal. With this design, the network device carries the information indicating the carrier frequency unit for the terminal to receive the downlink signal when sending the signal, which explicitly indicates the carrier frequency unit for the terminal to receive the downlink signal, avoids the understanding confusion between the network device and the terminal, and thereby improves the reliability of communication.

[0043] With reference to the first aspect, in a further possible design of the method, the X carrier frequency units correspond to at least two subcarrier spacings, the at least two subcarrier spacings include a first subcarrier spacing and a second subcarrier spacing, where the first subcarrier spacing is smaller than the second subcarrier spacing, one time unit of the carrier frequency unit corresponding to the first subcarrier spacing corresponds to time units of H carrier frequency units corresponding to the second subcarrier spacing; the carrier frequency unit corresponding to the first subcarrier spacing belongs to the X carrier frequency units corresponding to the first time unit of the time units of the H carrier frequency units corresponding to the second subcarrier spacing, or the carrier frequency unit corresponding to the first subcarrier spacing belongs to the X carrier frequency units corresponding to the last time unit of the time units of the H carrier frequency units corresponding to the second subcarrier spacing.

[0044] By using the design, in the case that X carrier units correspond to at least two subcarrier spacings, by determining the X carrier units corresponding to each time unit, the candidate PDSCH position can be accurately determined.

[0045] In combination with the first aspect, in yet another possible design, the candidate PDSCH positions in each time unit are the same or different.

[0046] In a second aspect, a communication method is provided. Exemplarily, the method can be applied to a network device side, for example, the method can be executed by a network device, or executed by a module (for example, a processor, a chip, a chip system, a circuit, etc.) in the network device. The module can be a communication module in the network device, or a circuit or chip responsible for a communication function in the network device, such as a modem chip, also known as a baseband chip, or a SOC chip or SIP chip containing a modem core.

[0047] The method comprises: determining L candidate PDSCH positions on a first resource set according to a number X of carrier units of a terminal in a time unit, the first resource set comprising M time units and N carrier units, X, L, M, and N are positive integers, and X≤N; transmitting a PDSCH at the L candidate PDSCH positions; and receiving a HARQ codebook, the HARQ codebook comprising Y HARQ information bits, the HARQ information bits being used to indicate whether the PDSCH is successfully received, Y being a positive integer, and Y≥L.

[0048] By using the method, the network device determines L candidate PDSCH positions in the first resource set according to the number X of carrier units of the terminal in a time unit or according to the carrier units used to receive a downlink signal in a time unit, but does not determine a candidate PDSCH position in each of the N carrier units in a time unit. The network device determines a candidate PDSCH position according to each of the X carrier units in the N carrier units, and does not determine a candidate PDSCH position in a carrier unit outside the X carrier units in the N carrier units. Compared with determining a candidate PDSCH position based on each of the N carrier units, the number of carrier units of the candidate PDSCH positions determined by the network device changes, so that the number of candidate PDSCH positions determined by the network device decreases, and then the terminal generates a HARQ codebook based on the L candidate PDSCH positions. One candidate PDSCH position corresponds to one (or more) HARQ bit, and the number of bits included in the HARQ codebook also decreases, which avoids including too many redundant bits in the HARQ codebook and reduces the load of uplink control information.

[0049] With reference to the second aspect, in a possible design of the second aspect, the X number of carriers are carriers for receiving downlink signals.

[0050] With reference to the second aspect, in a possible design of the second aspect, the X number of carriers are carriers for generating a HARQ codebook.

[0051] With reference to the second aspect, in another possible design of the second aspect, the N number of carriers are configured by the network device.

[0052] With reference to the second aspect, in a possible design of the second aspect, the N is greater than or equal to a number of carriers configured by the network device.

[0053] With reference to the second aspect, in another possible design of the second aspect, the N number of carriers are N number of downlink carriers configured by the network device.

[0054] With reference to the second aspect, in another possible design of the second aspect, the N number of carriers are N number of downlink carriers configured by the network device, and a number of uplink carriers configured by the network device is less than or equal to N.

[0055] With reference to the second aspect, in another possible design of the second aspect, the N number of carriers are active carriers. The terminal can receive in each of the N number of carriers, but due to limited downlink processing capability of the terminal, can only receive downlink signals in the X number of carriers.

[0056] With reference to the second aspect, in another possible design of the second aspect, the method further includes: receiving first information, the first information indicating a maximum number W of carriers for receiving downlink signals in a time unit, X≤W, and / or the first information indicating at least one group of downlink carriers, a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the W, the X being determined based on the at least one group of downlink carriers; wherein the first information is capability information of the terminal.

[0057] With reference to the second aspect, in another possible design of the second aspect, the second information is transmitted, the second information indicating the X and / or at least one group of downlink carriers, a number of different downlink carriers in the at least one group of downlink carriers being X, or a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the X, or the X number of carriers.

[0058] With reference to the second aspect, in another possible design of the second aspect, the method further includes: determining the L number of candidate PDSCH positions based on candidate PDSCH positions on the X number of carriers.

[0059] With reference to the second aspect, in a possible design of the method, the determining the L candidate PDSCH positions on the first resource set according to the number X of the carrier component units in one time unit includes: determining the candidate PDSCH positions in the X carrier component units in a time unit with the smallest index among the M time units; and determining the candidate PDSCH positions on the X carrier component units in each of the M time units in ascending order of the indices of the M time units, to obtain the L candidate PDSCH positions.

[0060] With this design, the number of HARQ bits in each time unit is fixed, because the upper limit of the number of CCs used for receiving downlink signals in each time unit is determined, and the order of traversing the frequency domain resources before traversing the time domain resources. The error in understanding the mapping relationship between HARQ information and CCs caused by PDCCH miss detection in one time unit does not affect another time unit.

[0061] With reference to the second aspect, in a possible design of the method, the X carrier component units are X carrier component units with the largest number of candidate PDSCH positions among the N carrier component units, and X≤N.

[0062] With this design, in a scenario where carrier component units can be dynamically switched, the number of candidate PDSCH positions in the N carrier component units in one time unit can be determined according to the X carrier component units with the largest number of candidate PDSCH positions among the N carrier component units, and the number of candidate PDSCH positions corresponding to actually scheduled CCs can be less than the determined number of candidate PDSCH positions, so that the terminal has enough HARQ feedback bits for HARQ feedback.

[0063] With reference to the second aspect, in a possible design of the method, the method further includes: transmitting a DCI in the first carrier component unit, where the DCI is used for scheduling a downlink signal; and the DCI includes a bit map, the bit map includes N bits, and an i-th bit in the N bits indicates whether the terminal receives the downlink signal on an i-th carrier component unit among the N carrier component units, where 0≤i≤N-1 or 1≤i≤N.

[0064] With reference to the second aspect, in a possible design of the method, the method further includes: transmitting a DCI in the first time unit and the first carrier component unit, where the DCI is used for scheduling a downlink signal; and the DCI includes a bit map, the bit map includes N bits, and an i-th bit in the N bits indicates whether the terminal receives the downlink signal on an i-th carrier component unit among the N carrier component units in the first time unit, where 0≤i≤N-1 or 1≤i≤N.

[0065] With reference to the second aspect, in a possible design of the method, the method further includes: receiving the DCI in the first time unit and the first carrier unit, where the DCI includes the second information, and the second information indicates that the terminal receives the downlink signal in the jthcarrier unit of the N carrier units other than the first carrier unit in the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0066] With reference to the second aspect, in a possible design of the method, the method further includes: receiving the DCI in the first time unit and the first carrier unit, where the DCI includes the second information, and the second information indicates that the terminal receives the downlink signal in the jthcarrier unit of the N carrier units other than the first carrier unit in the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0067] With reference to the second aspect, in a possible design of the method, the method further includes: receiving the DCI in the first carrier unit, where the DCI includes the third information, and the third information indicates that the first carrier unit is the kthcarrier unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X.

[0068] With reference to the second aspect, in a possible design of the method, the method further includes: receiving the DCI in the first carrier unit, where the DCI includes the third information, and the third information indicates that the first carrier unit is the kthcarrier unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X.

[0069] With reference to the second aspect, in a possible design of the method, the X carrier units correspond to at least two subcarrier spacings, the at least two subcarrier spacings include a first subcarrier spacing and a second subcarrier spacing, where the first subcarrier spacing is smaller than the second subcarrier spacing, one time unit of a carrier unit corresponding to the first subcarrier spacing corresponds to H time units of carrier units corresponding to the second subcarrier spacing; the carrier unit corresponding to the first subcarrier spacing belongs to X carrier units corresponding to a first time unit of the H time units of carrier units corresponding to the second subcarrier spacing, or the carrier unit corresponding to the first subcarrier spacing belongs to X carrier units corresponding to a last time unit of the H time units of carrier units corresponding to the second subcarrier spacing.

[0070] With this design, in the case where the X carrier units correspond to at least two subcarrier spacings, the candidate PDSCH position can be accurately determined by determining the X carrier units corresponding to each time unit.

[0071] With reference to the second aspect, in a possible design of the method, the candidate PDSCH positions in each time unit are the same or different.

[0072] The number of bits in the HARQ codebook corresponding to each time unit is fixed and does not affect each other. However, which X time units in the N time units are received by the terminal can change. When the terminal misses the PDCCH in a candidate PDSCH position, it will cause the terminal and the network device to understand the CC corresponding to the candidate PDSCH position in a time unit inconsistently, that is, the CC corresponding to the HARQ information bits in the HARQ codebook is understood inconsistently. Therefore, the following communication scheme is provided:

[0073] In a third aspect, a communication method is provided. Exemplarily, the method can be applied to the terminal side, for example, the method can be executed by the terminal or by a module (such as a processor, a chip, a chip system, a circuit, etc.) in the terminal. The module can be a communication module in the terminal or a circuit or chip responsible for communication functions in the terminal, such as a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core.

[0074] The method comprises receiving a DCI, wherein the DCI indicates to receive a first downlink signal on a second carrier unit.

[0075] Exemplarily, in this application, the DCI indicating to receive a first downlink signal on a second carrier unit can be replaced by the DCI being used to indicate at least one of X carrier units. Among them, the X carrier units are carrier units in the N carrier units. The X carrier units are carrier units used to receive downlink signals. The N carrier units are configured downlink carrier units.

[0076] By using this method, in the CA scenario, the terminal receives the DCI, which can indicate to receive the first data and / or information on the second carrier unit. Even if the terminal does not receive its own DCI on the second carrier unit, it can accurately receive the first data and / or information on the second carrier unit, thereby improving the reliability of communication.

[0077] In combination with the third aspect, in a possible design, the DCI indicates to receive a first downlink signal on the second carrier unit in a first time unit.

[0078] In combination with the third aspect, in another possible design, the receiving DCI comprises receiving the DCI on a first carrier unit, wherein the DCI indicates to receive a second downlink signal on the first carrier unit.

[0079] In combination with the third aspect, in another possible design, the receiving DCI comprises receiving the DCI on the first carrier unit in the first time unit, wherein the DCI further indicates to receive a second downlink signal on the first carrier unit in the first time unit.

[0080] In a fourth aspect, a communication method is provided. Exemplarily, the method can be applied to a network device side, for example, the method can be performed by a network device, or performed by a module (e.g., a processor, a chip, a chip system, a circuit, etc.) in the network device. The module can be a communication module in the network device, or a circuit or chip responsible for a communication function in the network device, such as a modem chip, also known as a baseband chip, or a SOC chip or SIP chip containing a modem core.

[0081] The method comprises: transmitting DCI, the DCI indicating that a first downlink signal is transmitted on a second carrier unit.

[0082] Exemplarily, in this application, the DCI indicating that the first downlink signal is transmitted on the second carrier unit can be replaced by the DCI being used to indicate at least one of X carrier units. The X carrier units are carrier units in N carrier units. The X carrier units are carrier units used for transmitting downlink signals. The N carrier units are configured downlink carrier units.

[0083] With this method, in the CA scenario, the network device transmits the DCI, which can indicate that the first data and / or information is received on the second carrier unit. Even if the terminal does not receive its own DCI on the second carrier unit, it can accurately receive the first data and / or information on the second carrier unit, thereby improving the reliability of communication.

[0084] In combination with the fourth aspect, in a possible design, the DCI indicates that the first downlink signal is transmitted on the second carrier unit in the first time unit.

[0085] In combination with the fourth aspect, in another possible design, the transmitting DCI comprises: transmitting the DCI on the first carrier unit, the DCI further indicating that a second downlink signal is received on the first carrier unit.

[0086] In combination with the fourth aspect, in another possible design, the transmitting DCI comprises: transmitting the DCI on the first carrier unit in the first time unit, the DCI indicating that a second downlink signal is received on the first carrier unit in the first time unit.

[0087] In combination with the third aspect or the fourth aspect, in another possible design, the first carrier unit and the second carrier unit belong to N carrier units, N being a positive integer, the DCI comprising a bit map, the bit map comprising N bits, an i-th bit in the N bits indicating whether a terminal receives a downlink signal on an i-th carrier unit in the N carrier units, where 0≤i≤N-1 or 1≤i≤N.

[0088] With reference to the third aspect or the fourth aspect, in a further possible design of the third aspect or the fourth aspect, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, and the DCI includes a bit map, the bit map includes N bits, and an i-th bit in the N bits indicates whether the terminal receives a downlink signal on an i-th carrier unit in the N carrier units in the first time unit, where 0≤i≤N-1 or 1≤i≤N.

[0089] With the design, after receiving the DCI, the terminal can accurately know whether to receive the first downlink signal on the first time unit and the second carrier unit according to the DCI, thereby improving the reliability of communication.

[0090] With reference to the third aspect or the fourth aspect, in a further possible design of the third aspect or the fourth aspect, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, and the DCI includes second information, the second information indicates that the terminal receives a downlink signal on a j-th carrier unit in the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0091] With reference to the third aspect or the fourth aspect, in a further possible design of the third aspect or the fourth aspect, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, and the DCI includes second information, the second information indicates that the terminal receives a downlink signal on a j-th carrier unit in the N carrier units except the first carrier unit in the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0092] With the design, the cross-checking manner can avoid the problem that the terminal misses the DCI indicating the carrier unit switching, and thus the terminal understands the carrier unit for receiving the downlink signal incorrectly, and avoids missing more information, thereby improving the communication efficiency.

[0093] With reference to the third aspect or the fourth aspect, in a further possible design of the third aspect or the fourth aspect, the DCI includes third information, the third information indicates that the second carrier unit is a k-th carrier unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X, and X is a quantity of carrier units used by the terminal to receive a downlink signal in a time unit.

[0094] With reference to the third aspect or the fourth aspect, in a further possible design of the third aspect or the fourth aspect, the DCI includes third information, the third information indicates that the second carrier unit is a k-th carrier unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X, and X is a quantity of carrier units used by the terminal to receive a downlink signal in a time unit.

[0095] With the design, after receiving the DCI, the terminal can accurately know whether to receive the first downlink signal in the first time unit and the second carrier unit according to the DCI, thereby improving the reliability of communication.

[0096] It can be understood that the DCI in the application can be replaced by control information, and the PDSCH can be replaced by data transmission. The control information is used for scheduling data transmission. In the application, the DCI and the PDSCH are taken as examples for description.

[0097] In a fifth aspect, a communication apparatus is provided for implementing the communication method in the first aspect, the third aspect, or any design of the first aspect or the third aspect. The apparatus can be a terminal, a module (for example, a processor, a chip, a chip system, a circuit, etc.) applied to the terminal, and can also be a logic node, a logic module, or software capable of realizing all or part of the terminal function.

[0098] In a sixth aspect, a communication apparatus is provided for implementing the communication method in the second aspect, the fourth aspect, or any design of the second aspect or the fourth aspect. The apparatus can be a network device, a module (for example, a processor, a chip, a chip system, a circuit, etc.) applied to the network device, and can also be a logic node, a logic module, or software capable of realizing all or part of the network device function.

[0099] In a possible implementation, the communication apparatus in the fifth aspect to the sixth aspect includes units, modules, or means for performing the method in any aspect or any design of the first aspect to the fourth aspect. The units, modules, or means can be implemented by software, or by hardware, or by a combination of software and hardware. For example, the communication apparatus can include a sending unit, a receiving unit, and a processing unit. The sending unit and the receiving unit can be independent or combined together (referred to as a “transceiving unit”).

[0100] When the communication apparatus is used to implement the method in the first aspect or any design of the first aspect, the processing unit is configured to determine L candidate PDSCH positions on a first resource set according to the number X of carrier units in a time unit, the first resource set including M time units and N carrier units, X, L, M, and N being positive integers, and X≤N; the transceiving unit is configured to receive a PDSCH at the L candidate PDSCH positions; and the transceiving unit is further configured to send a HARQ codebook, the HARQ codebook including Y HARQ information bits, the HARQ information bits being used to indicate whether the PDSCH is successfully received, Y being a positive integer, and Y≥L.

[0101] Optionally, the X carriers are carriers for receiving downlink signals, and the X carriers are carriers in the N carriers.

[0102] Optionally, the X carriers are carriers for generating a HARQ codebook.

[0103] Optionally, the N carriers are configured by the network device.

[0104] Optionally, the N is greater than or equal to a number of carriers configured by the network device.

[0105] Optionally, the N carriers are N downlink carriers configured by the network device.

[0106] Optionally, the N carriers are N downlink carriers configured by the network device, and a number of uplink carriers configured by the network device is less than or equal to N.

[0107] Optionally, in yet another possible design, the N carriers are activated carriers. The terminal can receive in each of the N carriers, but due to limited downlink processing capability of the terminal, can only receive downlink signals in X carriers.

[0108] Optionally, the transceiver is further configured to send first information, the first information indicating a maximum number W of carriers in a time unit, the X being determined based on the W, and / or the first information indicating at least one group of downlink carriers, a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the W, the X being determined based on the at least one group of downlink carriers; wherein the first information is capability information of the terminal; and / or the transceiver is further configured to receive second information from the network device, the second information indicating the X and / or at least one group of downlink carriers, a number of different downlink carriers in the at least one group of downlink carriers being X, or a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the X, or the X carriers.

[0109] Optionally, the processing unit is configured to determine the L candidate PDSCH positions based on candidate PDSCH positions on the X carriers.

[0110] Optionally, the processing unit is further configured to determine candidate PDSCH positions in the X carriers in a time unit with a smallest index in the M time units, and determine candidate PDSCH positions on the X carriers corresponding to each of the M time units in an ascending order of indices of the M time units, to obtain the L candidate PDSCH positions.

[0111] Optionally, the X carriers are X carriers with the largest number of candidate PDSCH positions in the N carriers, and X≤N.

[0112] Optionally, the transceiver is further configured to receive, in the first carrier, a DCI, the DCI scheduling the downlink signal; wherein the DCI comprises a bitmap, the bitmap comprising N bits, an i-th bit in the N bits indicating whether the terminal receives the downlink signal on an i-th carrier in the N carriers, where 0≤i≤N-1 or 1≤i≤N.

[0113] Optionally, the transceiver is further configured to receive, in the first time unit and the first carrier, a DCI, the DCI scheduling the downlink signal; wherein the DCI comprises a bitmap, the bitmap comprising N bits, an i-th bit in the N bits indicating whether the terminal receives the downlink signal on an i-th carrier in the N carriers in the first time unit, where 0≤i≤N-1 or 1≤i≤N.

[0114] Optionally, the transceiver is further configured to receive, in the first carrier, a DCI, the DCI comprising second information, the second information indicating that the terminal receives the downlink signal on a j-th carrier in the N carriers except the first carrier, where 0≤j≤N-2 or 1≤j≤N-1.

[0115] Optionally, the transceiver is further configured to receive, in the first time unit and the first carrier, a DCI, the DCI comprising second information, the second information indicating that the terminal receives the downlink signal on a j-th carrier in the N carriers except the first carrier in the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0116] Optionally, the transceiver is further configured to receive, in the first carrier, a DCI, the DCI comprising third information, the third information indicating that the first carrier is a k-th carrier received by the terminal, where 0≤k≤X-1 or 1≤k≤X.

[0117] Optionally, the transceiver is further configured to receive, in the first time unit and the first carrier, a DCI, the DCI comprising third information, the third information indicating that the first carrier is a k-th carrier received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X.

[0118] Optionally, the X carriers correspond to at least two subcarrier spacings, the at least two subcarrier spacings including a first subcarrier spacing and a second subcarrier spacing, wherein the first subcarrier spacing is smaller than the second subcarrier spacing, one time unit of the carrier corresponding to the first subcarrier spacing corresponds to H time units of the carriers corresponding to the second subcarrier spacing; the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the first time unit of the H time units of the carriers corresponding to the second subcarrier spacing, or the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the last time unit of the H time units of the carriers corresponding to the second subcarrier spacing.

[0119] Optionally, the candidate PDSCH positions in each time unit are the same or different.

[0120] When the communication apparatus is used to implement the method in the second aspect or any design of the second aspect, the processing unit is configured to determine L candidate PDSCH positions on a first resource set according to the number X of carriers of a terminal in a time unit, the first resource set including M time units and N carriers, X, L, M and N are positive integers, and X≤N; the transceiver is configured to send a PDSCH at the L candidate PDSCH positions; and the transceiver is further configured to receive a HARQ codebook, the HARQ codebook including Y HARQ information bits, the HARQ information bits being used to indicate whether the PDSCH is successfully received, Y being a positive integer, and Y≥L.

[0121] Optionally, the X carriers are carriers for receiving a downlink signal, and the X carriers are carriers in the N carriers.

[0122] Optionally, the X carriers are carriers for generating a HARQ codebook.

[0123] Optionally, the N carriers are configured by a network device.

[0124] Optionally, the N is greater than or equal to the number of carriers configured by the network device.

[0125] Optionally, the N carriers are N downlink carriers configured by the network device.

[0126] Optionally, the N carriers are N downlink carriers configured by the network device, and the number of uplink carriers configured by the network device is less than or equal to N.

[0127] Optionally, in yet another possible design, the N carriers are active carriers. The terminal can receive in each of the N carriers, but due to the limited downlink processing capability of the terminal, the terminal can only receive downlink signals in X carriers.

[0128] Optionally, the transceiver is further configured to receive first information, the first information indicating a maximum number W of carriers for receiving downlink signals in a time unit, the X being determined based on the W, and / or the first information indicating at least one group of downlink carriers, a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the W, the X being determined based on the at least one group of downlink carriers; wherein the first information is capability information of the terminal.

[0129] Optionally, the transceiver is further configured to send second information, the second information indicating the X and / or at least one group of downlink carriers, a number of different downlink carriers in the at least one group of downlink carriers being X, or a number of downlink carriers in the at least one group of downlink carriers being less than or equal to the X, or the X carriers.

[0130] Optionally, the processing unit is configured to determine the L candidate PDSCH positions based on candidate PDSCH positions in the X carriers.

[0131] Optionally, the processing unit is configured to determine candidate PDSCH positions in X carriers in a time unit with a smallest index among the M time units, determine candidate PDSCH positions in X carriers corresponding to each of the M time units in an ascending order of indices of the M time units, and obtain the L candidate PDSCH positions.

[0132] Optionally, the X carriers are X carriers with a largest number of candidate PDSCH positions in the N carriers, and X≤N.

[0133] Optionally, the transceiver is further configured to receive a DCI in a first carrier, the DCI scheduling a PDSCH; wherein the DCI includes a bit map, the bit map including N bits, an i-th bit in the N bits indicating whether the terminal receives the PDSCH in an i-th carrier in the N carriers, where 0≤i≤N-1 or 1≤i≤N.

[0134] Optionally, the transceiver is configured to receive the DCI in the first time unit and the first carrier unit, the DCI scheduling the PDSCH; wherein the DCI comprises a bit map, the bit map comprising N bits, an i-th bit in the N bits indicating whether the terminal receives the PDSCH in the first time unit on an i-th carrier unit in the N carrier units, where 0≤i≤N-1 or 1≤i≤N.

[0135] Optionally, the transceiver is further configured to receive the DCI in the first carrier unit, the DCI comprising second information, the second information indicating that the terminal receives the PDSCH on a j-th carrier unit in the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0136] Optionally, the transceiver is configured to receive the DCI in the first time unit and the first carrier unit, the DCI comprising second information, the second information indicating that the terminal receives the PDSCH in the first time unit on a j-th carrier unit in the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0137] Optionally, the transceiver is further configured to receive the DCI in the first carrier unit, the DCI comprising third information, the third information indicating that the first carrier unit is a k-th carrier unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X.

[0138] Optionally, the transceiver is further configured to receive the DCI in the first time unit and the first carrier unit, the DCI comprising third information, the third information indicating that the first carrier unit is a k-th carrier unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X. Optionally, the X carrier units correspond to at least two subcarrier spacings, the at least two subcarrier spacings comprising a first subcarrier spacing and a second subcarrier spacing, wherein the first subcarrier spacing is smaller than the second subcarrier spacing, one time unit of a carrier unit corresponding to the first subcarrier spacing corresponds to H time units of carrier units corresponding to the second subcarrier spacing; the carrier unit corresponding to the first subcarrier spacing belongs to X carrier units corresponding to a first time unit of the H time units of carrier units corresponding to the second subcarrier spacing, or the carrier unit corresponding to the first subcarrier spacing belongs to X carrier units corresponding to a last time unit of the H time units of carrier units corresponding to the second subcarrier spacing.

[0139] Optionally, the candidate PDSCH positions in each time unit are the same or different.

[0140] The communication device is configured to implement the method in the third aspect or any design of the third aspect. The transceiver is configured to receive the DCI, and the DCI indicates that the first data and / or information is received on the second carrier unit.

[0141] Optionally, the DCI indicates that the first data and / or information is received on the first time unit and the second carrier unit.

[0142] Optionally, the transceiver is further configured to receive the DCI on the first carrier unit, and the DCI further indicates that the second data and / or information is received on the first carrier unit.

[0143] Optionally, the transceiver is further configured to receive the DCI on the first time unit and the first carrier unit, and the DCI further indicates that the second data and / or information is received on the first time unit and the first carrier unit.

[0144] Optionally, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, the DCI includes a bit map, the bit map includes N bits, and the i th bit in the N bits indicates whether the terminal receives the downlink signal on the i th carrier unit in the N carrier units, where 0≤i≤N-1 or 1≤i≤N.

[0145] Optionally, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, the DCI includes a bit map, the bit map includes N bits, and the i th bit in the N bits indicates whether the terminal receives the downlink signal on the i th carrier unit in the N carrier units within the first time unit, where 0≤i≤N-1 or 1≤i≤N.

[0146] Optionally, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, the DCI includes second information, and the second information indicates that the terminal receives the downlink signal on the j th carrier unit in the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0147] Optionally, the first carrier unit and the second carrier unit belong to N carrier units, N is a positive integer, the DCI includes second information, and the second information indicates that the terminal receives the downlink signal on the j th carrier unit in the N carrier units except the first carrier unit within the first time unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0148] Optionally, the DCI includes third information, the third information indicating that the second carrier unit is a kth carrier unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X, and X is a number of carrier units used by the terminal to receive the downlink signal in one time unit.

[0149] Optionally, the DCI includes third information, the third information indicating that the second carrier unit is a kth carrier unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X, and X is a number of carrier units used by the terminal to receive the downlink signal in one time unit.

[0150] When the communication apparatus is used to implement the method in the fourth aspect or any one of the designs of the fourth aspect, the transceiver is configured to send the DCI, the DCI indicating that the first downlink signal is sent on the second carrier unit.

[0151] For example, in this application, the DCI indicating that the first downlink signal is received on the second carrier unit can be replaced by the DCI indicating at least one of X carrier units. The X carrier units are carrier units in N carrier units. The X carrier units are carrier units used to receive the downlink signal. The N carrier units are configured downlink carrier units. Optionally, the DCI further indicates that the first downlink signal is sent on the second carrier unit in the first time unit.

[0152] Optionally, the transceiver is further configured to send the DCI on the first carrier unit, the DCI further indicating that the second downlink signal is received on the first carrier unit.

[0153] Optionally, the transceiver is further configured to send the DCI on the first carrier unit in the first time unit, the DCI further indicating that the second downlink signal is received on the first carrier unit in the first time unit.

[0154] Optionally, the transceiver is further configured to receive the DCI in the first carrier unit, the DCI scheduling the downlink signal; wherein the DCI includes a bit map, the bit map including N bits, an i-th bit in the N bits indicating whether the terminal receives the downlink signal on an i-th carrier unit in the N carrier units, where 0≤i≤N-1 or 1≤i≤N.

[0155] Optionally, the transceiver unit is further configured to receive a DCI within a first time unit and a first carrier unit, wherein the DCI schedules downlink signals; wherein the DCI includes a bit map, the bit map includes N bits, and the i-th bit of the N bits indicates whether the terminal receives downlink signals within the first time unit and on the i-th carrier unit of the N carrier units, wherein 0≤i≤N-1 or 1≤i≤N.

[0156] Optionally, the transceiver unit is further configured to receive DCI within a first carrier unit, the DCI including second information, the second information indicating that the terminal receives a downlink signal on the j-th carrier unit other than the first carrier unit among N carrier units, where 0≤j≤N-2 or 1≤j≤N-1.

[0157] Optionally, the transceiver unit is further configured to receive DCI within a first time unit and a first carrier unit, the DCI including second information, the second information indicating that the terminal receives a downlink signal within the first time unit on the j-th carrier unit (excluding the first carrier unit) of N carrier units, where 0≤j≤N-2 or 1≤j≤N-1.

[0158] Optionally, the transceiver unit is further configured to receive DCI within a first carrier unit, the DCI including third information indicating that the first carrier unit is the kth carrier unit received by the terminal, where 0≤k≤X-1 or 1≤k≤X.

[0159] Optionally, the transceiver unit is further configured to receive DCI within a first time unit and a first carrier unit, the DCI including third information indicating that the first carrier unit is the kth carrier unit received by the terminal within the first time unit, where 0≤k≤X-1 or 1≤k≤X.

[0160] In another possible implementation, the communication device in the fifth to sixth aspects above includes a processor; the processor is configured to implement the corresponding functions of the communication method described above.

[0161] Optionally, the processor may be coupled to a memory for storing necessary programs (instructions) and / or data of the device. Optionally, the communication device may also include a communication interface for enabling communication between the device and other network elements. Optionally, the memory may be located internally or externally to the communication device.

[0162] Optionally, the communication apparatus can further comprise a transceiving device, the processor is coupled with the transceiving device, and the processor is configured to execute the computer program or the instruction to control the transceiving device to receive and send information; when the processor executes the computer program or the instruction, the processor is further configured to realize the above method through a logic circuit or an execution code instruction. The transceiving device can be a transceiver, a transceiving circuit or an input / output interface, which is configured to receive a signal from another communication apparatus outside the communication apparatus and transmit the signal to the processor or send a signal from the processor to another communication apparatus outside the communication apparatus. When the communication apparatus is a chip, the transceiving device is a transceiving circuit or an input / output interface.

[0163] When the communication apparatus in the fifth aspect to the sixth aspect is a chip, the sending unit can be an output unit, such as an output circuit or a communication interface; and the receiving unit can be an input unit, such as an input circuit or a communication interface. When the communication apparatus is a terminal, the sending unit can be a transmitter or a transmitter; and the receiving unit can be a receiver or a receiver.

[0164] In a seventh aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program or an instruction, and when the computer program or the instruction is executed, the method in the above aspects is realized.

[0165] In an eighth aspect, a computer program product containing instructions is provided, and when the instructions are run on a communication apparatus, the communication apparatus executes the method in the above aspects.

[0166] In a ninth aspect, a communication system is provided, which comprises the communication apparatus in the fifth aspect or any design in the fifth aspect, and the communication apparatus in the sixth aspect or any design in the sixth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0167] Figure 1 is a schematic diagram of a possible, non-limiting communication system;

[0168] Figure 2 is a schematic diagram of carrier aggregation;

[0169] Figure 3 is a schematic diagram of an example of determining candidate PDSCH positions to generate a HARQ codebook;

[0170] Figure 4 is a flowchart of a communication method provided by an embodiment of the present application;

[0171] Figure 5 is a schematic diagram of a missed DCI in an example of the present application;

[0172] Figures 6-7 An example of determining candidate PDSCH positions for the present application;

[0173] Figure 8 An example of different subcarrier spacings corresponding to four carriers for the present application;

[0174] Figure 9 A flowchart of another communication method provided by an embodiment of the present application;

[0175] Figures 10-11 A structural diagram of a communication device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0176] The schemes of the present application will be further described below in conjunction with the accompanying drawings.

[0177] The technical schemes provided by the present application can be applied to various communication systems, for example, can be applied to a fifth generation (5 th generation, 5G) mobile communication system, a future evolution system or a variety of communication convergence systems, etc. The application scenarios of the technical schemes provided by the present application can include a variety of scenarios, such as machine to machine (M2M), macro micro communication, enhanced mobile broadband (eMBB), ultra reliable & low latency communication (uRLLC) and massive machine type communication (mMTC), etc. These scenarios can include but are not limited to: terminal to terminal communication scenarios, network device to network device communication scenarios, network device to terminal communication scenarios, etc. Among them, the network device includes an access network device and a core network device. Hereinafter, the scenario of application in network device and terminal communication is taken as an example for description.

[0178] Figure 1 A possible, non-limiting communication system is shown in a schematic diagram. As Figure 1 shown, the communication system 1000 includes a radio access network (RAN) 100 and a core network (CN) 200. The communication system 1000 can also include the Internet 300. The RAN 100 includes at least one RAN node (e.g., base stations 110a and 110b, collectively referred to as 110) and at least one terminal (e.g., user equipment (UE) 120a and 120b, collectively referred to as 120). Figure 1 Figure 1 ​RAN 100 can also include other RAN nodes not shown in FIG. 1 such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 1) etc. The terminals 120 are connected by wireless links to the RAN nodes 110. The RAN nodes 110 are connected by wireless or wired links to the core network 200. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be the same physical device or different physical devices. Figure 1

[0179] The RAN 100 can be a 3rd generation partnership project (3GPP) related cellular system, e.g., a 4G, 5G mobile communication system, or a future communication network (or future evolution of the 3GPP related cellular system). The RAN 100 can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. The RAN 100 can also be a communication system that combines two or more of the above systems.

[0180] The RAN nodes 110 can also be referred to as network devices, access network devices, RAN entities, or access nodes, etc. The RAN nodes 110 form part of the communication system 1000 to help terminals to access the network wirelessly. The RAN nodes 110 in the communication system 1000 can be the same type of nodes or different types of nodes. In some scenarios, the roles of the RAN nodes 110 and the terminals 120 are relative, e.g., Figure 1 In some scenarios, the network element 120i can be a helicopter or a drone, which can be configured to move as a base station for those terminals 120j accessing to the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal. The RAN nodes 110 and the terminals 120 are sometimes referred to as communication apparatuses, e.g., Figure 1 In some scenarios, the network elements 110a and 110b can be understood as communication apparatuses with base station functionalities, and the network elements 120a-120j can be understood as communication apparatuses with terminal functionalities.

[0181] ​In one possible scenario, a RAN node can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a base station in a future mobile communication system, or an access node in a WiFi system, etc. A RAN node can also be a macro base station (such as...) Figure 1 110a), micro base stations or indoor stations (such as Figure 1 In CRAN scenarios, RAN nodes can be 110b), relay nodes or donor nodes, or wireless controllers. Optionally, RAN nodes can also be servers, wearable devices, vehicles, or in-vehicle equipment. For example, network devices in vehicle-to-everything (V2X) technology can be roadside units (RSUs).

[0182] In another possible scenario, multiple RAN nodes assist the terminal in achieving wireless access, with different RAN nodes each implementing some of the base station's functions. For example, RAN nodes can be central units (CUs), distributed units (DUs), central unit-control planes (CU-CPs), central unit-user planes (CU-UPs), or radio units (RUs), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radioheads (RRHs).

[0183] The CU (or CU-CP and CU-UP), DU or RU can also have different names in different systems, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an open-central unit (O-CU), the DU can also be referred to as an open-distributed unit (O-DU), the CU-CP can also be referred to as an open-central unit-control plane (O-CU-CP), the CU-UP can also be referred to as an open-central unit-user plane (O-CU-UP), and the RU can also be referred to as an open-radio unit (O-RU). For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in this application. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0184] The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied to various scenarios, such as device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, etc. Embodiments of the present application do not limit the device form of the terminal.

[0185] The communication between the network device and the terminal follows a certain protocol layer structure. The protocol layer can include a control plane protocol layer and a user plane protocol layer. The control plane protocol layer can include at least one of a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media access control (MAC) layer, or a physical (PHY) layer, etc. The user plane protocol layer can include at least one of a service data adaptation protocol (SDAP) layer, a PDCP layer, an RLC layer, a MAC layer, or a physical layer, etc.

[0186] The base station and the terminal can be fixed in position or movable. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; can also be deployed on an airplane, a balloon, and a man-made satellite. The embodiments of the present application do not limit the application scenarios of the base station and the terminal.

[0187] The roles of the base station and the terminal can be relative, for example, Figure 1 The helicopter or the unmanned aerial vehicle 120i in the figure can be configured as a mobile base station, and for those terminals 120j accessing the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through a wireless air interface protocol. Of course, 110a and 120i can also communicate through a base station-to-base station interface protocol, at this time, relative to 110a, 120i is also a base station. Therefore, the base station and the terminal can be collectively referred to as a communication device, Figure 1 110a and 110b in the figure can be referred to as a communication device with a base station function, Figure 1 120a-120j in the figure can be referred to as a communication device with a terminal function.

[0188] In the embodiments of the present application, the base station is also referred to as a network device, and the device for realizing the function of the network device can be a network device; can also be a device capable of supporting the network device to realize the function, such as a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module. The device can be installed in the network device or used in matching with the network device. In the embodiments of the present application, only the device for realizing the function of the network device is taken as an example for description, and the scheme of the embodiments of the present application is not limited.

[0189] In addition, in the embodiments of the present application, the UE is also referred to as a terminal, and the apparatus for implementing the function of the terminal can be a terminal, or can be an apparatus capable of supporting the terminal to implement the function, such as a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module. The apparatus can be installed in the terminal or used in combination with the terminal. In the embodiments of the present application, only the apparatus for implementing the function of the terminal is taken as an example for description, and the scheme of the embodiments of the present application is not limited in this way.

[0190] It should be understood that Figure 2 It should be understood that

[0191] It should be understood that all or part of the functions of one or more of the terminal, the access network device, the core network device, or the network element for implementing the artificial intelligence function can be virtualized, that is, implemented by one or more of a special processor or a general processor and a corresponding software module. Among them, the terminal and the access network device involve the interface of air interface transmission, and the transceiving function of the interface can be realized by hardware. The core network device, such as an operation administration and maintenance (OAM) network element, can be virtualized. Optionally, one or more functions of the virtualized terminal, access network device, core network device, or network element for implementing the artificial intelligence function can be realized by a cloud device, such as a cloud device in an over the top (OTT) system.

[0192] The present application relates to carrier aggregation, and the concept of carrier aggregation is introduced as follows:

[0193] As Figure 3 As shown in the schematic diagram of carrier aggregation, in order to meet the requirement of improving the peak rate in some communication scenarios (such as an enhanced mobile broadband (eMBB) scenario), the cell bandwidth can be increased, but the maximum bandwidth of a single cell is fixed, so multiple cell bandwidths are aggregated for the terminal, which is the technical idea of carrier aggregation. After aggregating multiple component carriers, the bandwidth that the terminal can enjoy is the sum of the bandwidths of the multiple carriers, and the peak rate can also be almost proportionally improved.

[0194] Among them, the carrier aggregation includes the following types:

[0195] (1) Intra-band contiguous CC aggregation: The component carriers for aggregation belong to the same frequency band, and the component carriers are contiguous in frequency domain.

[0196] (2) Intra-band non-contiguous CC aggregation: The component carriers for aggregation belong to the same frequency band, and the component carriers are non-contiguous in frequency domain.

[0197] (3) Inter-band CC aggregation: The component carriers for aggregation belong to different frequency bands.

[0198] In the CC aggregation scenario, the number of CCs in uplink is generally the same as that in downlink or the number of CCs in downlink is greater than that in uplink, for example, the terminal needs to support the configuration of 4 UL CCs and also needs to support the configuration of 4 DL CCs or more than 4 DL CCs. Different scenarios have different requirements for uplink and downlink services, and decoupling of uplink and downlink capabilities can ensure that the uplink capability is improved while avoiding the improvement of the downlink capability. In other words, the terminal can support different numbers of CCs in uplink and downlink. However, the CCs in uplink and downlink can be configured together, and then some of the configured CCs are selected for uplink and some of the configured CCs are selected for downlink.

[0199] The scenarios involved in the present application include, for example, the terminal cannot receive downlink information on each of the configured DL CCs, or the terminal can only receive downlink information in a subset of the configured DL CCs, or the terminal can only receive downlink information in a subset of the configured DL CCs in a certain time unit. For example, the terminal supports sending information on 4 UL CCs and only supports receiving information in 2 DL CCs.

[0200] The present application relates to HARQ, and the concept of HARQ is introduced as follows:

[0201] In the transmission over a wireless channel, errors are easily generated due to the change of the received signal quality. To some extent, this change can be offset by link adaptation, but link adaptation cannot offset the receiver noise and unpredictable interference changes. Therefore, almost all wireless communication systems will adopt the form of forward error correction (FEC) to add redundant information to the transmitted signal, so that the receiver can correct errors.

[0202] HARQ is a combination of FEC and automatic repeat request (ARQ) mechanisms and has been widely applied in many modern communication systems. For a data unit generated by error correction coding, if the receiver detects an error after error correction decoding, the transmitter will be requested to retransmit.

[0203] HARQ is the main way to handle retransmission in NR. When a data packet is not received correctly, retransmission needs to be requested. A decoded failed data packet still contains useful information, and simply discarding the decoded failed data packet will cause the loss of useful information. HARQ with soft combining solves this problem. HARQ with soft combining: the received error data packet is stored in the buffer and combined with the retransmitted data packet received later. The combined data packet contains more redundant bits, improving the reliability of decoding.

[0204] The terminal feeds back the HARQ multiplexing of multiple transport blocks. The multiple bits of HARQ information corresponding to the multiple transport blocks are called a HARQ codebook (also called a HARQ-ACK codebook).

[0205] The order in which a terminal generates a HARQ codebook is as follows:

[0206] Determine the candidate PDSCH position in each CC, and then obtain the candidate PDSCH position in all CCs, and generate the HARQ codebook based on the candidate PDSCH position. Specifically, first determine the candidate PDSCH position in the CC with the lowest index in all CCs in the frequency domain (i.e., the candidate PDSCH position in all time domain units in the CC), and then determine the candidate PDSCH position on each CC in ascending order of CC index, and then obtain the candidate PDSCH position in all CCs. The terminal generates the corresponding HARQ bit information according to the candidate PDSCH position.

[0207] This HARQ codebook generation method generates a codebook through the candidate PDSCH position, and the codebook size does not change dynamically with the actual data scheduling situation. It can be generally referred to as a semi-static codebook, or a semi-static codebook generation method. The following is described by taking the semi-static codebook as an example, and the name of the present application is not limited.

[0208] The semi-static codebook is determined according to at least one of the following parameters: the RRC configured {K1} set, the PDSCH time domain resource allocation table (time domain resource indication information), the ratio of uplink SCS and downlink SCS, the uplink and downlink ratio of the frame structure, and the number of carriers of carrier aggregation.

[0209] The generation steps of the semi-static codebook are as follows:

[0210] Step 1: Determine whether the current time slot is before the downlink (DL) bandwidth part (BWP) and the uplink (UL) BWP switching, if yes, skip, if not, go to step 2.

[0211] Step 2: Based on the uplink / downlink ratio of the time slots, traverse the PDSCH time domain resource allocation table to determine whether there is a possibility of PDSCH reception in a certain time slot (i.e., whether there is a usable time domain resource allocation index). If there is a possibility of PDSCH reception, then determine a candidate PDSCH position. Assuming that the terminal has the ability to receive multiple PDSCHs in one time slot, then based on the PDSCH time domain resource allocation table, determine the N possible PDSCH reception positions in a certain time slot and determine the N candidate PDSCH positions.

[0212] Step 3: Based on {K1}, traverse all time slots to determine the candidate PDSCH position within a carrier.

[0213] Step 4: Traverse all carrier waves.

[0214] like Figure 3 The diagram illustrates an example of determining candidate PDSCH positions to generate a HARQ codebook. The terminal is configured with four CCs: CC0, CC1, CC2, and CC3. K1 represents the time interval between the slot containing the PDSCH and the slot containing the PUCCH. The K1 set is configured as {2, 3, 4, 5, 6}, meaning that the terminal receives the PDSCH in slot n and feeds back HARQ information in slot n+K1. Figure 3 As shown, the PDSCHs on slot n, slot n+1, slot n+2, slot n+3, and slot n+4 all transmit the corresponding HARQ information on slot n+6, and these PDSCHs generate the HARQ codebook in the order of first traversing the time domain and then traversing the frequency domain. Figure 3 Indices 1-17 correspond to 17 possible candidate PDSCH positions, each corresponding to 17 bits. The ascending order of the indices corresponds to the order of the HARQ information corresponding to that candidate PDSCH position in the HARQ codebook. The candidate PDSCH position at index 1 corresponds to the first ACK / NACK message in the HARQ codebook, the candidate PDSCH position at index 2 corresponds to the second ACK / NACK message, the candidate PDSCH position at index 17 corresponds to the 17th ACK / ANCK message, and so on.

[0215] In the above process, each CC included in the CA may generate PDSCH scheduling, so the terminal will determine the candidate PDSCH position for the possible PDSCH scheduling on the CC.

[0216] Generally, a ULCC is configured alongside a DLCC. The number of DLCCs configured on a network device is greater than or equal to the number of ULCCs. Under high uplink service demands such as live streaming, the number of ULCCs needs to be increased to improve uplink throughput. However, increasing uplink capacity requires increasing the number of uplink CCs, which passively increases the number of DLCCs. But the terminal's downlink processing capability may be limited. When the terminal's downlink processing capability is limited, the number of DLCCs the terminal can process is less than the number of DLCCs configured on the network device. Consequently, the number of DLCCs the terminal uses to receive downlink signals within a single time unit is less than the number of DLCCs configured on the network device.

[0217] For example, when the terminal's downlink reception capability is limited or not strong enough, such as when the terminal is configured with a CA on 4 DL CCs, and the terminal only wants to receive PDCCH / PDSCH on 2 of the 4 DL CCs. Since the terminal only receives PDCCH / PDSCH on 2 CCs, it does not need to determine candidate PDSCH positions for the CCs where it does not receive PDCCH / PDSCH. Therefore, the above scheme leads to unnecessary reserved bits, resulting in bit redundancy and excessive uplink load.

[0218] Still with Figure 4 For example, the terminal identifies 17 candidate PDSCH positions, and the HARQ codebook is 17 bits long. However, due to the terminal's limited receiving capability, it will not receive PDSCH in some downlink time slots on CC2 and CC3. Therefore, the terminal does not need to perform corresponding HARQ feedback, and the HARQ information corresponding to these candidate PDSCH positions is redundant in the HARQ codebook. Following this scheme will result in many meaningless redundant bits.

[0219] In view of this, this application provides a communication scheme that reduces the load of uplink control information.

[0220] In this application, the time unit can be any of the following: sub-frame, slot, mini-slot, orthogonal frequency division multiplexing (OFDM) symbol, or the smallest scheduling unit in the time domain.

[0221] A carrier unit can be replaced or understood as any of the following: CC, band, serving cell, bandwidth, bandwidth part (BWP), resource block set, frequency domain unit, or the smallest scheduling unit in the frequency domain.

[0222] This application does not impose any restrictions on the units of time units and carrier units.

[0223] It is understood that DCI in this application can be replaced with control information, and PDSCH can be replaced with data transmission, whereby the control information is used to schedule data transmission. This application uses DCI and PDSCH as examples for description.

[0224] The communication method provided in the embodiments of this application is described below based on the above communication system:

[0225] like Figure 5 The diagram shown is a flowchart illustrating a communication method provided in an embodiment of this application. Exemplarily, the method may include the following steps:

[0226] S401a. The terminal determines L candidate PDSCH positions on the first resource set based on the number X of carrier units in a time unit.

[0227] The first resource set contains potential locations for PDSCH transmission, and it is necessary to determine the candidate PDSCH locations on the first resource set. The first resource set includes M time units and N carrier units, where M and N are positive integers. The N carrier units are downlink carrier units supported by the terminal configured in the network device. For example, the N carrier units are the N downlink carrier units configured in the network device.

[0228] In this embodiment, the terminal determines L candidate PDSCH positions on the first resource set based on the number X of carrier units within a time unit. X and L are both positive integers, and X ≤ N. The X carrier units are carrier units used for receiving downlink signals, or carrier units used for generating a HARQ codebook, or carrier units used for determining candidate PDSCH positions, or carrier units used for determining the HARQ codebook length, or carrier units used for determining the number of candidate PDSCH positions. The X carrier units are carrier units among the N carrier units. For example, the X carrier units can be understood as carrier units used for receiving downlink signals, or carrier units that may have downlink transmission. Optionally, the number X is less than or equal to the terminal's downlink processing capability.

[0229] Optionally, the N carrier units are active carrier units or carrier units in an active state. The terminal can receive signals on each of the N carrier units, but due to the limited downlink processing capability of the terminal, it can only receive downlink signals on X carrier units.

[0230] For example, the N carriers are configured by the network device. N is greater than or equal to the number of uplink carriers configured by the network device, that is, the number of downlink carriers configured by the network device is less than or equal to N. In this way, the number of UL CCs can be increased in the case of following the configuration of one UL CC with the configuration of one DL CC, that is, the number of DL CCs configured by the network device is greater than or equal to the number of UL CCs, but the terminal can process less than the number of DL CCs configured by the network device (that is, X carriers less than N carriers), thereby not increasing the burden of the downlink processing capability of the terminal.

[0231] The above step can be replaced by: the terminal determines L candidate PDSCH positions on the second resource set according to the number X of carriers used for receiving downlink signals in one time unit, and the second resource set includes M time units and X carriers.

[0232] The above step can be replaced by: the terminal determines L candidate PDSCH positions on the first resource set according to the carriers used for receiving downlink signals (or X carriers used for receiving downlink signals) in one time unit. That is, the terminal can determine L candidate PDSCH positions according to the carriers used for receiving downlink signals instead of X. The terminal obtains the carriers used for receiving downlink signals, that is, the number of carriers used for receiving. For example, in one time unit, the terminal receives data on CC1 and CC2, and X = 2. Or,

[0233] The above step can be replaced by: the terminal determines L candidate PDSCH positions on the second resource set, and the second resource set includes M time units and X carriers. Wherein, the X carriers are located in the N carriers.

[0234] The X carriers in each time unit of the M time units are indicated or configured by the network device. The X carriers in each time unit of the M time units can be different or the same, and can be independently indicated by the network device or jointly indicated by the network device. For the explanations of M, X, and N, refer to the descriptions in S401a and S401b.

[0235] S401b. The network device determines L candidate PDSCH positions on the first resource set according to the number X of carriers of the terminal in one time unit.

[0236] Correspondingly, the above step can be replaced by: the network device determines L candidate PDSCH positions on the first resource set according to the carriers used for receiving downlink signals by the terminal in one time unit.

[0237] Alternatively, the above steps can be replaced by that the network device determines L candidate PDSCH positions on a second resource set, and the second resource set includes M time units and X carrier units. The X carrier units are carrier units in the N carrier units. The X carrier units in each time unit of the M time units are indicated or configured by the network device. For details, refer to the description in S401a and S401b.

[0238] The present application can be applied to the scenario of decoupling of uplink sending capability and downlink receiving capability, or the scenario of greater uplink sending capability than downlink receiving capability, or the scenario of limited downlink receiving capability, or the scenario of lower downlink receiving capability than downlink configuration, or the scenario of large uplink bandwidth, or the scenario of multiple carriers, or the scenario of downlink carrier switching. The present application does not constrain the scenario to which the technical solution is applied. Since the uplink resource can be less than the downlink resource, the terminal can concatenate the HARQ information of multiple PDSCHs scheduled by the network device for feedback. These PDSCHs can be scheduled by the network device for the terminal in different time domain resources and / or frequency domain resources. The HARQ information corresponding to these PDSCHs concatenated together is called a HARQ codebook. For example, the HARQ codebook is a 3-bit bit string "101", where "1" represents ACK, and "0" represents NACK (or "0" represents ACK, and "1" represents NACK. Here, the case of "1" representing ACK and "0" representing NACK is taken as an example for description). The 3 bits correspond to PDSCH1, PDSCH2, and PDSCH3 respectively, which means that the terminal successfully receives PDSCH1 and PDSCH3, and does not successfully receive PDSCH2. After the HARQ codebook is sent to the network device, the network device will schedule the retransmission of PDSCH2 to the terminal until the terminal successfully receives it. The generation rule of the HARQ codebook is the arrangement mode of ACK / NACK information. The mapping relationship between ACK / NACK and PDSCH needs to be consistent between the network device and the terminal, otherwise confusion will occur. One carrier unit can also be understood as an active downlink bandwidth part (BWP) in one carrier unit.

[0239] The M time units are determined according to the PUCCH time slot (the time slot in which the PUCCH carrying the HARQ information is located) and the K1 set in which the HARQ information is located. K1 is the time interval between the PDSCH time slot and the PUCCH time slot.

[0240] The candidate PDSCH position can also be replaced by a candidate PDSCH occasion, a candidate PDSCH opportunity, a candidate PDSCH resource, or an index corresponding to the candidate PDSCH position. The candidate PDSCH position is a position where PDSCH scheduling can occur. The candidate PDSCH position can also be understood as a time domain resource and / or a frequency domain resource where PDSCH scheduling can occur. Optionally, the network device does not schedule two PDSCHs that overlap in the time domain, and therefore the candidate PDSCH position can be a candidate PDSCH time domain resource. Each candidate PDSCH time domain resource in each carrier unit corresponds to one bit in the HARQ codebook. The candidate PDSCH position is replaced by an index corresponding to the candidate PDSCH position, and L candidate PDSCH positions can be understood as a set of L indexes corresponding to the L candidate PDSCH positions. In this embodiment, the terminal determines L candidate PDSCH positions on the first resource set according to the number X of carrier units used to receive downlink signals in a time unit. X and L are both positive integers, and X≤N. The terminal determines the L candidate PDSCH positions based on the candidate PDSCH positions on the X carrier units.

[0241] In a possible design, the above X can be obtained according to the terminal capability reported by the terminal to the network device. The value of X cannot exceed the terminal capability reported by the terminal to the network device.

[0242] In an example, the terminal sends first information to the network device, where the first information indicates the maximum number W of CCs used to receive downlink signals in a time unit. For example, if the terminal reports W=4, it means that the terminal can receive PDSCHs on at most 4 DL CCs in a time unit.

[0243] The network device receives the first information from the terminal. The network device sends configuration information to the terminal. The configuration information indicates the number X of CCs used by the terminal to receive downlink signals in a time unit, or the configuration information indicates X CCs used by the terminal to receive downlink signals in a time unit, or the configuration information indicates CCs used by the terminal to receive downlink signals, or the configuration information indicates CCs used by the terminal to receive downlink signals in M time units. The X is determined based on W. For example, when W=4, the network device can configure the terminal to receive information on 4 CCs or on 3 CCs, and X is less than or equal to W. The terminal determines the candidate PDSCH position according to the configuration information of the network device.

[0244] In another example, the first information can be a combination of CCs supported by the terminal. For example, the first information indicates at least one combination of CCs, and the number of CCs in the at least one combination of CCs is less than or equal to W. The network device receives the combination of CCs reported by the terminal, determines X CCs, and configures the terminal. For example, the terminal reports that it supports the combination of CC0 and CC1, and the combination of CC0, CC1 and CC2, and the terminal can receive PDSCH on at most 3 CCs (CC0, CC1 and CC2) in the same time unit.

[0245] For example, X = W, the terminal determines L candidate PDSCH positions or generates HARQ information or determines the number of bits of HARQ information based on W carriers in one time unit. That is, the terminal determines L candidate PDSCH positions or generates HARQ information or determines the number of bits of HARQ information based on the upper limit of its parallel receiving capability. That is, the terminal determines L candidate PDSCH positions based on the candidate PDSCH positions in W carriers. That is, the candidate PDSCH positions in W carriers in M time units are L candidate PDSCH positions. In this way, the terminal determines L candidate PDSCH positions according to the maximum capability, the network device performs data scheduling within the terminal capability, and the terminal can perform HARQ feedback for potential data scheduling. It should be known that the position and number of carriers in each time unit in M time units can be different. In this application, the first resource set is a set of time units and carrier units used by the terminal to receive downlink signals.

[0246] It should be known that the application does not constrain the way the terminal reports the terminal capability. The terminal reports the terminal capability to the network device. The network device indicates X carrier units used by the terminal to receive downlink signals. The scheduling of the network device does not exceed the terminal capability reported by the terminal.

[0247] In another possible design, the X is indicated by the network device or the X carriers are indicated by the network device; or the X or the X carriers can be determined by the terminal itself; or the X is a preset value or a preconfigured value. Specifically, the X can be a value configured by the network device to the terminal, or determined according to a parameter configured by the network device to the terminal, or the X carriers for receiving the downlink signal are indicated by signaling of the network device. The signaling of the network device can be RRC signaling, MAC CE signaling, or DCI signaling. For example, the network device sends second information to the terminal, the second information indicating the X or indicating the X carriers. Illustratively, the network device can configure a value of the X, or configure a combination of CCs, or indicate CCs used by the terminal to receive the downlink signal. Further, the value of the X can be less than or equal to a terminal capability reported by the terminal to the network device. Illustratively, the terminal reports to the network device a maximum number of supported and received CCs, and when the network device indicates the CCs used by the terminal to receive the downlink signal, the number of the CCs used to receive the downlink signal is less than or equal to the maximum number of supported and received CCs reported by the terminal to the network device.

[0248] For example, the CC for receiving a downlink signal can be understood as a CC for blindly detecting a PDCCH, or a CC for receiving a PDSCH, or a CC for receiving a PDCCH and a PDSCH, or a CC for receiving or measuring control information, or a CC for receiving all signals. The control information includes at least one of a PDCCH, a reference signal, a synchronization signal block (SSB), and a beam. For example, the reference signal is received or measured. The SSB is received or measured. The beam is received or measured. In this application, the control information is received according to the category of the control information. In the first implementation, for the first resource set, the terminal and the network device determine the candidate PDSCH position in the order of traversing the frequency domain resource first and then traversing the time domain resource, and generate the HARQ information according to the candidate PDSCH position. In other words, the terminal determines the candidate PDSCH position in the order of traversing the frequency domain resource first and then traversing the time domain resource. The terminal determines L candidate PDSCH positions in the order of traversing X carrier units in the frequency domain and then traversing M time units in the time domain. Specifically, the terminal determines the candidate PDSCH position in each time unit of the M time units, and combines the candidate PDSCH positions in the M time units in ascending order of the time domain. For example, in the time domain, the terminal generates the HARQ information in ascending order of the index of the time unit (or descending order, as long as the order is determined, it does not affect the essence of the application, and the ascending order is used in this embodiment). In the frequency domain, the terminal generates the HARQ information in ascending order of the index of the frequency domain unit (or descending order, as long as the order is determined, it does not affect the essence of the application, and the ascending order is used in this embodiment).

[0249] Here, the terminal does not need to determine the candidate PDSCH position for each carrier unit in the N carrier units. The terminal can determine the candidate PDSCH position for each carrier unit in the X carrier units in the N carrier units.

[0250] For example, the terminal determines the number of candidate PDSCH positions as L, where 0≤i≤M-1, 0≤j≤X i -1, where X i is the number of CCs (CCs for receiving a downlink signal, CCs for generating a HARQ codebook, or CCs for determining a candidate PDSCH position) in the i-th time unit. T i,j is the number of candidate PDSCH positions in the i-th time unit and the j-th CC. For example, the number of CCs in each time unit of the M time units is the same, then X i =X, L=X*M.

[0251] For example, the terminal can first determine the candidate PDSCH position in the X carriers in the time unit with the smallest index in the M time units, then determine the candidate PDSCH position in the X carriers corresponding to each of the M time units in the order of the index of the M time units from small to large, and finally obtain the L candidate PDSCH positions.

[0252] The determination of the candidate PDSCH position in one carrier in one time unit includes that the terminal determines one candidate PDSCH position in the carrier in the time unit. In other words, when the terminal does not have the capability of receiving multiple PDSCHs in one time unit, one carrier in one time unit corresponds to one candidate PDSCH position. That is, when the terminal does not report the capability of receiving multiple PDSCHs in one time unit, the terminal receives at most one PDSCH in one carrier in one time unit, and thus there is one candidate PDSCH position in one carrier in one time unit. In other words, in combination with the description of S401a, one candidate PDSCH position is determined, that is, at least one index corresponding to the candidate PDSCH position is determined. Whether the specific position or the index corresponding to the position is used, the terminal can determine the length of the HARQ codebook.

[0253] When the terminal has the capability of receiving multiple PDSCHs in one time unit, the terminal determines one or more candidate PDSCH positions in the carrier in the time unit. The candidate PDSCH position can be the candidate PDSCH position corresponding to the maximum number of candidate PDSCH positions in the carrier in the time unit. In other words, in combination with the description of S401a, at least one index corresponding to at least one candidate PDSCH position in the carrier in the time unit is determined. The number of the at least one index is the maximum number in the carrier in the time unit.

[0254] In which, one candidate PDSCH position corresponds to 1 HARQ information bit (or multiple HARQ information bits, which does not affect the essence of the application, and here 1 candidate PDSCH corresponds to 1 HARQ information bit is taken as an example) in the HARQ codebook. By traversing the frequency domain resource first and then traversing the time domain resource, since the upper limit of the number of CCs used to receive downlink signals in each time unit is determined, the number of HARQ bits corresponding to each time unit is fixed. The error in the understanding of the mapping relationship between the HARQ information and the CC caused by the PDCCH miss detection in one time unit will not affect another time unit. For example, Figure 6The diagram illustrates a missed DCI in this application. The DCI on time slot n+2 and CC0 indicates that the next time slot (i.e., time slot n+3) will switch from CC0 to CC2 to receive PDSCH. Assuming a missed DCI on time slot n+2 and CC0, since the terminal traverses frequency domain resources first and then time domain resources, it first traverses CC0 to CC1 corresponding to time slot n+2 to determine the candidate PDSCH position and the number of bits in the HARQ codebook corresponding to the candidate PDSCH position. Therefore, even if a missed DCI on time slot n+2 and CC0 is detected, the terminal will not determine time slot n+3 and CC2 as candidate PDSCH positions, nor will it determine the bits in the HARQ codebook for that candidate PDSCH position. However, this does not affect the mapping relationship between the HARQ information corresponding to the candidate PDSCH position on time slot n+2 and the CC. Thus, compared to traversing multiple time units within a CC first and then traversing the CC, the solution in this embodiment is more robust.

[0255] like Figure 6 The diagram illustrates an example of determining a candidate PDSCH position according to this application. Taking time units as time slots as an example, where K1 = {2,3,4,5,6}, if the terminal sends HARQ codebook information on CC0 in time slot n+6, then the first resource set includes 5 time slots: time slots n to n+4 and 2 CCs, namely CC0 and CC1 in time slot n, CC0 and CC1 in time slot n+1, CC0 and CC1 in time slot n+2, CC1 and CC2 in time slot n+3, and CC2 and CC3 in time slot n+4. The network device configures or instructs the terminal on the CCs used to receive downlink signals within a time unit based on the number of carrier units reported by the terminal. The terminal determines X = 2. Figure 6 In this configuration, the terminal supports receiving a maximum of one PDSCH per CC and per time slot. The terminal starts from the time slot with the smallest index in the first resource set, such as... Figure 6 Starting with time slot n, the terminal iterates through the CCs (corresponding to CCs in ascending order of their indices) within time slot n for receiving downlink signals. The network device is configured with four CCs: CC0 to CC3. The number of CCs used for receiving downlink signals within a time slot is X = 2, meaning the terminal receives PDCCH and PDSCH, or PDSCH, on two CCs. Assuming time slot n within CC0 is a downlink time slot (meaning the network device can schedule PDSCH for the terminal in this time slot), the terminal determines this position as a candidate PDSCH position. This candidate PDSCH position corresponds to 1 bit in the HARQ codebook, which is the HARQ information corresponding to this PDSCH. Similarly, the terminal determines the position corresponding to time slot n and CC1 as candidate PDSCH positions. The terminal determines two candidate PDSCH positions within time slot n, corresponding to 2 bits in the HARQ codebook. This process continues...Figure 3 There are 2 candidate PDSCH positions in each downlink slot, corresponding to 2 bits in the HARQ codebook, and 5 slots correspond to 10 bits. Compared with the manner shown in Figure 7 , the terminal saves 17-10=7 bits.

[0256] As shown in Figure 6 , another schematic diagram for determining candidate PDSCH positions in the present application is shown, which is different from Figure 7 . In Figure 7 , the terminal supports receiving multiple PDSCHs on 1 CC and 1 slot. Correspondingly, one candidate PDSCH position can correspond to multiple bits in the HARQ codebook. The terminal determines the candidate PDSCH position in one slot according to the time domain resource indication information of the PDSCH and the number or position of downlink symbols included in the downlink slot. Since the number of downlink symbols included in each downlink slot in each CC is not necessarily the same, the number of candidate PDSCH positions included in each downlink slot is not necessarily the same, and the number of bits in the HARQ codebook corresponding to the downlink slot is not necessarily the same. In μFrom time slot n, traverse CC0, CC1, where {CC0, time slot n} has 2 PDSCH candidate positions, corresponding to 2 bits in the HARQ codebook; {CC1, time slot n} has 4 PDSCH candidate positions, corresponding to 4 bits in the HARQ codebook; {CC0, time slot n+1} has 2 PDSCH candidate positions, corresponding to 2 bits in the HARQ codebook, {CC1, time slot n+1} has 4 PDSCH candidate positions, corresponding to 4 bits in the HARQ codebook; {CC0, time slot n+2} has 2 PDSCH candidate positions, corresponding to 2 bits in the HARQ codebook, {CC1, time slot n+2} has 4 PDSCH candidate positions, corresponding to 4 bits in the HARQ codebook; {CC1, time slot n+3} has 2 PDSCH candidate positions, corresponding to 2 bits in the HARQ codebook; {CC2, time slot n+3} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC2, time slot n+4} has 2 PDSCH candidate positions, corresponding to 2 bits in the HARQ codebook; {CC3, time slot n+4} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook. This 23 bits is called a HARQ codebook according to the generation order. In other words, the length of the HARQ codebook is 23 bits. According to the scheme in the background art, in addition to the above 23 bits, the number of bits in the HARQ codebook corresponding to the following time-frequency domain positions also includes: {CC2, time slot n} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC3, time slot n} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC2, time slot n+1} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC3, time slot n+1} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC2, time slot n+2} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC3, time slot n+2} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC0, time slot n+3} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook; {CC3, time slot n+3} has 1 PDSCH candidate position, corresponding to 1 bit in the HARQ codebook. Therefore, compared with the scheme in the background art, 8 bits are saved in this embodiment.

[0257] In another implementation, the terminal obtains X carrier units in a time unit (or the terminal obtains X carrier units in a time unit for receiving a downlink signal or for generating HARQ information or for determining candidate PDSCH positions or the number X of carrier units), and determines L candidate PDSCH positions on the first resource set. The X carrier units are X carrier units with the largest number of candidate PDSCH positions in the N carrier units. The terminal and the network device determine L candidate PDSCH positions on the first resource set according to the number X of CCs (or X CCs) for receiving a downlink signal in a time unit, as described above (in this application, the determination of a position, the index of a position, and the number of positions can be replaced, and the essence is to determine the length of a HARQ codebook, and the corresponding HARQ bit in the HARQ codebook performs HARQ feedback for the scheduling of the network device). However, the CCs scheduled by the network device can be dynamically switched, and the terminal can not be able to determine in advance which X CCs it will receive PDCCH / PDSCH. In the scenario where the carrier units can be dynamically switched, the number of candidate PDSCH positions in the N carrier units in a time unit can be determined according to the X carrier units with the largest number of candidate PDSCH positions in the N carrier units. The number of candidate PDSCH positions corresponding to the actually scheduled CCs can be less than the determined number of candidate PDSCH positions, so that the terminal has enough HARQ feedback bits for HARQ feedback. Therefore, the number of candidate PDSCH positions in the N carrier units in a time unit is the sum of the number of candidate PDSCH positions in the X carrier units, the X carrier units are X carrier units with the largest number of candidate PDSCH positions in the N carrier units, and X ≤ N. The terminal determines the candidate PDSCH positions in the N carrier units, that is, the candidate PDSCH positions in the X carrier units in the N carrier units. The terminal does not determine candidate PDSCH positions for carrier units that do not receive PDSCH.

[0258] For example, assuming that the network device configures 4 CCs, the positions of the candidate PDSCHs can be determined according to the above method. The terminal determines the positions of the candidate PDSCHs according to the 2 CCs with the largest number of candidate PDSCH positions in each time slot among the 4 CCs, or selects 2 CCs according to the descending order of the number of candidate PDSCH positions in each time slot among the 4 CCs (selects the 2 CCs with the largest number of candidate PDSCH positions). In the case where the terminal supports dynamically determining 2 CCs in the first resource set to receive the PDSCH, the number of bits in the HARQ codebook corresponding to the candidate PDSCH positions corresponding to the actually scheduled CC pair can be smaller than the number of bits in the HARQ codebook corresponding to the candidate PDSCH positions determined by selecting the 2 CCs with the largest number of candidate PDSCH positions. Assuming that the terminal determines 6, 6, 6, and 4 candidate PDSCH positions in time slot n~time slot n+3, respectively, corresponding to 6, 6, 6, and 4 HARQ information bits in the HARQ codebook. Taking time slot n as an example, since the number of bits in the HARQ codebook corresponding to the candidate PDSCH positions determined by selecting 2 CCs according to the descending order of the number of candidate PDSCH positions in each time slot, regardless of how the network device schedules in the 4 CCs, the terminal has enough bits for corresponding HARQ feedback.

[0259] By determining the number of candidate PDSCH positions in the N carrier units in a time unit according to the X carrier units with the largest number of candidate PDSCH positions in the N carrier units, the network device and the terminal can avoid inconsistent understanding of the received downlink CC, which leads to incorrect understanding of the mapping relationship between the HARQ information and the received CC in the time slot between the network device and the terminal. For example, the terminal has the largest number of candidate PDSCH positions in CC0 and CC1 in time slot n, which are 2 and 4, respectively, corresponding to 6 bits in the HARQ codebook. In this way, even if the actual received CC is not CC0 and CC1, the terminal has enough bits in the HARQ codebook, and there is no network device scheduling but no feedback position in the HARQ codebook corresponding to the scheduling.

[0260] In the second implementation, the terminal and the network device determine L candidate PDSCH positions in the first resource set in the order of traversing time domain resources first and then traversing frequency domain resources. That is, the terminal first determines the candidate PDSCH positions in each carrier unit, and then determines the candidate PDSCH positions in the X carrier units. The terminal can arrange the candidate PDSCH positions in the X carrier units together in ascending order of the carrier units. Further, the terminal generates HARQ information according to the L candidate PDSCH positions. The X carrier units are in the N carrier units, and the N carrier units are the downlink carrier units supported by the terminal and configured by the network device. For example, the terminal generates the HARQ information in ascending order of the indexes of the time units (or in descending order, as long as the order is determined, the essence of the application is not affected, and the ascending order is used in this embodiment) in the time domain. In the frequency domain, the terminal generates the HARQ information in ascending order of the indexes of the frequency units (or in descending order, as long as the order is determined, the essence of the application is not affected, and the ascending order is used in this embodiment). Specifically, the candidate PDSCH positions in the M time units in the carrier unit with the smallest index in the X carrier units are first determined, then the candidate PDSCH positions in the M time units corresponding to each of the X carrier units are determined in the order of the indexes of the X carrier units from small to large, and finally the L candidate PDSCH positions are obtained.

[0261] Here, the terminal does not need to determine the candidate PDSCH positions for each of the N carrier units. The terminal can determine the candidate PDSCH positions in each of the X carrier units in the N carrier units. The terminal determines the HARQ codebook according to the candidate PDSCH positions. Therefore, the number of HARQ bits decreases when the candidate PDSCH positions decrease, the overhead of the uplink control signaling decreases, and the transmission efficiency of the uplink signaling is effectively improved.

[0262] For example, the determination of the L candidate PDSCH positions in S401a / S401b can be replaced by the determination of the number of candidate PDSCH positions as L.

[0263] For example, the L candidate PDSCH positions can be replaced by L HARQ reservation bits. One HARQ reservation bit corresponds to one candidate PDSCH position. The X carrier units for determining the L HARQ reservation bits and the X carrier units for receiving the downlink signal are determined independently. That is, the terminal determines the L HARQ reservation bits based on the X carrier units, generates Y HARQ information bits based on the candidate PDSCH positions associated with the L HARQ reservation bits.

[0264] S402. The network device transmits a PDSCH at the L candidate PDSCH positions.

[0265] Alternatively, the step S402 can be that the network device sends the PDSCH.

[0266] Correspondingly, the terminal receives the PDSCH at the L candidate PDSCH positions.

[0267] The network device sends the PDCCH and the PDSCH scheduled by the PDCCH at the L candidate PDSCH positions. The terminal receives the PDCCH and the PDSCH scheduled by the PDCCH at the L candidate PDSCH positions.

[0268] Alternatively, the step can be that the network device sends the PDSCH on the first resource set, and correspondingly, the terminal receives the PDSCH on the first resource set. This step can be combined with “the number of the candidate PDSCH positions is L”.

[0269] For example, in the scenario of dynamic carrier switching, the X carrier units in different time units in the M time units can be different. When the terminal determines the candidate PDSCH positions, the X carrier units are not necessarily the carrier units for receiving the downlink signal. In this case, the X carrier units can be understood as the carrier units for determining the candidate PDSCH positions. On the carrier units for determining the candidate PDSCH positions, the terminal does not necessarily receive the downlink signal on the carrier units. The candidate PDSCH positions in a time unit can be understood as the candidate PDSCH positions corresponding to one or more HARQ bits. That is, there is an association between the candidate PDSCH positions in a time unit and the carrier units for receiving the downlink signal.

[0270] For example, the terminal determines the L candidate PDSCH positions based on the candidate PDSCH positions in the X carrier units. In a time unit, the X carrier units (the X carrier units for determining the length of the HARQ codebook) and the X carrier units for receiving the downlink signal have a one-to-one mapping relationship or a corresponding relationship or an association. The terminal generates the HARQ information based on the candidate PDSCH positions in the i-th carrier unit of the X carrier units, including that the terminal generates the HARQ information based on the candidate PDSCH positions in the i-th carrier unit of the X carrier units for receiving the downlink signal corresponding to the i-th carrier unit. That is, the candidate PDSCH positions in the i-th carrier unit of the X carrier units and the candidate PDSCH positions in the i-th carrier unit of the X carrier units for receiving the downlink signal have a one-to-one correspondence (the lengths can be different, and the mapping starts from the position with the smallest index or a preset starting position). The corresponding relationship can be based on the ascending order of the index, the descending order of the index, or a preset order. The order of the index can be to traverse the carrier units first and then traverse the time units, or to traverse the time units first and then traverse the carrier units.

[0271] For example, the terminal generates the HARQ information based on the candidate PDSCH positions in X carrier units for receiving the downlink signal in a time unit. The number of the candidate PDSCH positions in the X carrier units for receiving the downlink signal is less than or equal to L. In this way, even in the case of dynamic carrier switching, the terminal can perform the HARQ feedback regardless of how the network device switches, and the case that the terminal considers that the L candidate PDSCH positions can be received and the number of PDSCHs scheduled by the network device is greater than L does not occur.

[0272] For example, the steps S401a / S401b and S402 can be replaced by that the terminal generates the HARQ codebook (or generates Y HARQ information bits) based on X carrier units in a time unit. The X carrier units are carrier units in N carrier units, and the N carrier units are configured downlink carrier units.

[0273] S403. The terminal sends the HARQ codebook.

[0274] Correspondingly, the network device receives the HARQ codebook. Optionally, the HARQ codebook in the embodiment of the application can be replaced by the HARQ information.

[0275] After the terminal receives the PDSCH at the candidate PDSCH position, the terminal generates the HARQ information corresponding to the PDSCH based on the received PDSCH. If the terminal successfully receives the PDSCH sent by the network device, the terminal generates the acknowledgement (ACK) information; if the terminal does not successfully receive the PDSCH sent by the network device, the terminal generates the non-acknowledgement (NACK) information.

[0276] If the terminal does not receive the PDSCH at the candidate PDSCH position, the terminal generates the NACK information.

[0277] The terminal generates Y HARQ information bits according to the L candidate PDSCH positions. Each of the Y HARQ information bits is the ACK information or the NACK information. One of the L candidate PDSCH positions corresponds to at least one HARQ information bit.

[0278] After the terminal generates the HARQ information, the terminal sends the HARQ information to the network device. The PDCCH also indicates the time domain position for sending the HARQ information corresponding to the PDSCH, and the terminal sends the HARQ information at the indicated time domain position.

[0279] In this embodiment, the terminal receives the PDSCH at L candidate PDSCH positions, one candidate PDSCH position can receive one or more transmission blocks (TBs), and the HARQ codebook includes Y HARQ information bits, the description of the HARQ information bits is referred to the description above, Y is a positive integer, and Y≥L.

[0280] When one PDSCH includes one TB or includes 2 TBs and supports HARQ bundling (i.e., the HARQ information of the 2 TBs is logically ANDed, and the 2 HARQ information bits are both ACK information, then it is ACK information; one of the 2 HARQ information bits is NACK information or both are NACK information, then it is NACK information), and the terminal feeds back based on the TB, then Y=X.

[0281] When one PDSCH includes 2 TBs and does not support HARQ bundling, or the terminal feeds back based on the code block group (CBG), and one PDSCH corresponds to multiple HARQ information bits, then Y>L.

[0282] After the terminal generates the HARQ codebook, the terminal sends the HARQ codebook.

[0283] It can be understood that the scheme of this embodiment can be applied to the above-mentioned feedback based on the TB or CBG. One TB can include multiple code blocks (CBs), and the multiple CBs can be divided into multiple CBGs. When the terminal feeds back based on the CBG, one TB corresponds to multiple HARQ information bits. For example, the network device configures that one TB includes 4 CBGs, and when one TB includes 10 CBs, the 10 TBs are divided into 4 CBGs, and the 4 CBGs include 3, 3, 2, and 2 CBs respectively, then the TB corresponds to 4 bits. When the feedback based on the CBG is configured on the CC, the number of HARQ bits corresponding to each candidate PDSCH position in one CC in one time slot increases. One PDSCH can include 1 TB or 2 TBs. When one PDSCH includes 2 TBs and does not support HARQ bundling, one TB corresponds to 2 HARQ information bits. That is, the number of bits corresponding to one candidate PDSCH position does not affect the essence of the application, and can be combined with the scheme in this application.

[0284] The above-mentioned embodiments are described by taking the example that X carrier units correspond to the same subcarrier spacing. In some communication scenarios, the subcarrier spacings of the above-mentioned X carrier units can be different.

[0285] In the embodiment, the X carriers correspond to at least two subcarrier spacings, and the at least two subcarrier spacings include a first subcarrier spacing and a second subcarrier spacing. The first subcarrier spacing is smaller than the second subcarrier spacing. Since the first subcarrier spacing is smaller than the second subcarrier spacing, one time unit of the carriers corresponding to the first subcarrier spacing can correspond to time units of the carriers corresponding to the second subcarrier spacing. The embodiment assumes that one time unit of the carriers corresponding to the first subcarrier spacing corresponds to H time units of the carriers corresponding to the second subcarrier spacing.

[0286] In Table 1 below, values of the subcarrier spacing Δf are given. The subcarrier spacings are in a multiple relationship.

[0287] Table 1

[0288] Figure 8 Δf = 2 μ · 15 [kHz]] 0 15 1 30 2 60 3 120 4 240 5 480 6 960

[0289] For example, the first subcarrier spacing is 15 kHz, and the second subcarrier spacing is 30 kHz. Then, one time unit of the carriers corresponding to the first subcarrier spacing corresponds to 2 time units of the carriers corresponding to the second subcarrier spacing.

[0290] Since the time units of the carriers corresponding to the first subcarrier spacing are not aligned with the time units of the carriers corresponding to the second subcarrier spacing, how to determine which subcarrier spacing the carriers corresponding to a certain time unit belong to? There are two possible designs for determining the X carriers as follows.

[0291] In the first possible design, the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the first time unit of the H time units of the carriers corresponding to the second subcarrier spacing, i.e., the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the starting time domain position of the time domain positions of the carriers corresponding to the second subcarrier spacing. That is, the carriers corresponding to the first subcarrier spacing are not included in the X carriers corresponding to the time units other than the first time unit of the H time units of the carriers corresponding to the second subcarrier spacing.

[0292] In the second possible design, the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the last time unit of the H time units of the carriers corresponding to the second subcarrier spacing, i.e., the carriers corresponding to the first subcarrier spacing belong to the X carriers corresponding to the ending time domain position of the time domain positions of the carriers corresponding to the second subcarrier spacing.

[0293] In a second possible design, the carrier units corresponding to the first subcarrier spacing belong to the X carrier units corresponding to the i th time unit of the time units of the H carrier units corresponding to the second subcarrier spacing, i.e., the carrier units corresponding to the first subcarrier spacing belong to the X carrier units corresponding to the ending time domain position of the time domain positions of the H carrier units corresponding to the second subcarrier spacing. 0≤i≤H-1. Here, i can be a fixed value, or a preset value, or a preconfigured value, or indicated by the network device.

[0294] As shown in Figure 8 , it is a diagram for illustrating the different subcarrier spacings corresponding to the four carrier units of the example of the present application. CC0 corresponds to SCS1 (e.g., SCS=15 kHz), and CC1-CC3 correspond to SCS2 (e.g., SCS=30 kHz). K1={2,3}. According to the time slot for sending the HARQ codebook, K1, and the number of CCs for receiving the downlink signal in one time slot being 2, the candidate PDSCH positions can be determined as shown in Figure 8 . The time slots of CC0 corresponding to SCS1 correspond to the time slots of CC1-CC3 corresponding to SCS2.

[0295] Corresponding to the first possible design described above, the CCs corresponding to SCS1 belong to the first time slot corresponding to the maximum 2 carrier units of the time slots of the 2 CCs corresponding to SCS2. In Figure 8 , according to the numbers in the brackets, the CC (CC0) corresponding to number 1 corresponds to SCS1, the CC (CC1) corresponding to number 2 corresponds to SCS2, SCS1 is less than SCS2, the time slots of CC0 corresponding to SCS1 correspond to the time slots of CC1 corresponding to SCS2, the CC (CC0) corresponding to number 1 belongs to the maximum 2 carrier units corresponding to the first time slot of the CC (CC1) corresponding to number 2, therefore, the CCs corresponding to numbers 1 and 2 form a group; the CC corresponding to number 3 is a separate group; the CC (CC0) corresponding to number 4 corresponds to SCS1, the CC (CC3) corresponding to number 5 corresponds to SCS2, SCS1 is less than SCS2, the time slots of CC0 corresponding to SCS1 correspond to the time slots of CC3 corresponding to SCS2, the CC (CC0) corresponding to number 4 belongs to the maximum 2 carrier units corresponding to the first time slot of the CC (CC3) corresponding to number 5, therefore, the CCs corresponding to numbers 4 and 5 form a group; and the CC corresponding to number 6 is a separate group.

[0296] Corresponding to the second possible design described above, the CCs corresponding to SCS1 belong to the second time slot corresponding to the 2 carrier units of the time slots of the 2 CCs corresponding to SCS2, that is, when reserving bits for the maximum 2 CCs corresponding to each time slot, the bits are reserved according to the ending position of the time slots of the CCs corresponding to SCS2. In Figure 9In the diagram, based on the numbers in parentheses, the CC corresponding to number 2 is in a separate group; the CC (CC0) corresponding to number 1 corresponds to SCS1, and the CC (CC2) corresponding to number 3 corresponds to SCS2. Since SCS1 is less than SCS2, the time slot of CC0 corresponding to SCS1 corresponds to the time slot of CC2 corresponding to two SCS2. The CC (CC0) corresponding to number 1 belongs to the largest two carrier units corresponding to the second time slot of CC (CC2) corresponding to number 2. Therefore, the CCs corresponding to numbers 1 and 3 are in a group; the CC corresponding to number 5 is in a separate group; and the CC (CC0) corresponding to number 4 corresponds to SCS1, and the CC (CC3) corresponding to number 6 corresponds to SCS2. Since SCS1 is less than SCS2, the time slot of CC0 corresponding to SCS1 corresponds to the time slot of CC3 corresponding to two SCS2. The CC (CC0) corresponding to number 4 belongs to the largest two carrier units corresponding to the second time slot of CC (CC3) corresponding to number 5. Therefore, the CCs corresponding to numbers 4 and 6 are in a group.

[0297] When X carrier units correspond to at least two types of subcarrier spacing, the candidate PDSCH position can be accurately determined by determining the X carrier units corresponding to each time unit.

[0298] According to an embodiment of this application, a communication method is provided in which a terminal and a network device determine L candidate PDSCH positions on a first resource set based on the number X of carrier units used to receive downlink signals within a time unit. This enables the terminal to generate a HARQ codebook based on the L candidate PDSCH positions, avoiding the inclusion of too many redundant bits in the HARQ codebook and reducing the load on uplink control information.

[0299] According to the scheme described in the above embodiments, the number of bits in the HARQ codebook corresponding to each time unit of the terminal is fixed and does not affect each other. However, since the terminal can vary in which X time units out of N time units it receives data, when the terminal misses the PDCCH at a certain candidate PDSCH position, it will cause inconsistency in the understanding of CC corresponding to the candidate PDSCH position within a corresponding time unit between the terminal and the network device, that is, inconsistency in the understanding of CC corresponding to the HARQ information bits in the HARQ codebook. To this end, this application also provides the following embodiments:

[0300] like Figure 5 The diagram shown illustrates another communication method provided in this application. Exemplarily, the method may include the following steps:

[0301] S901. Network devices send DCI.

[0302] Correspondingly, the terminal receives DCI.

[0303] Alternatively, the network device transmits the control information. Correspondingly, the terminal receives the control information. Exemplarily, the control information is DCI. The DCI is carried in the PDCCH.

[0304] In a possible implementation of the embodiment, the network device transmits the DCI in the first time unit and the first carrier unit, where the DCI instructs the terminal to receive the first downlink signal in the first time unit and the second carrier unit.

[0305] In a possible implementation of the embodiment, the network device transmits the DCI in the first carrier unit, where the DCI instructs the terminal to receive the first downlink signal (downlink signal) in the second carrier unit. The definition of the first time unit is an optional feature.

[0306] The reception of the first downlink signal by the terminal can be understood as the reception of the PDCCH, or the reception of the PDSCH, or the reception of the PDCCH and the PDSCH, or the reception of information. The form of the information is not restricted in the application.

[0307] Exemplarily, in the application, the DCI instructing the reception of the first downlink signal in the second carrier unit can be replaced by the DCI instructing at least one carrier unit of X carrier units. The X carrier units are carrier units of N carrier units. The X carrier units are carrier units for receiving the downlink signal. The N carrier units are configured downlink carrier units.

[0308] Exemplarily, the DCI instructs the terminal to use X carrier units in the first time unit for receiving the downlink signal. Alternatively, the DCI instructs the terminal to use at least one carrier unit of X carrier units in the first time unit for receiving the downlink signal.

[0309] Optionally, in the scheme combining S901 and S401a, S401b-S403, the first resource set includes M time units and N carrier units, and M and N are both positive integers. The first time unit is any one of the M time units, and the first carrier unit and the second carrier unit are any one of the N carrier units. That is, the terminal receives the DCI in the first time unit. The DCI instructs the terminal to receive the first downlink signal in the second carrier unit in addition to receiving the second downlink signal (downlink signal) in the first carrier unit where the terminal is located. The number of the second carrier unit is greater than or equal to 1 and less than or equal to N-1.

[0310] Here, the first downlink signal and the second downlink signal are used to describe that the DCI schedules the PDSCH, and the DCI is used to instruct at least one carrier of X carriers of N carriers to be a carrier for receiving the downlink signal.

[0311] In this application, the first downlink signal and the second downlink signal can be the same downlink signal, or can be replaced by downlink signals.

[0312] In this way, even if the terminal does not receive the DCI of the second carrier unit itself on the second carrier unit at the first time unit, it can determine whether to receive the PDSCH on the second carrier unit according to the DCI received on the first carrier unit at the first time unit. In other words, the terminal can obtain the carrier unit for receiving downlink signal information within one time unit according to the DCI on one carrier unit. In this application, the first carrier unit and the second carrier unit are taken as examples, and the number of carrier units can be a positive integer, which is not restricted in this application.

[0313] Especially when the terminal misses the DCI indicating the CC switching, according to the above scheme, it can be accurately known whether the CC switching is performed and on which CC the PDSCH is received in the next time unit. For example, Figure 5 As shown in the figure, it is a schematic diagram of the missed DCI in this application. The DCI on CC0 in time slot n+2 indicates that the PDSCH in the next time slot (i.e. time slot n+3) is switched from CC0 to CC2. According to the scheme of the background art, if the terminal misses the DCI on CC0 in time slot n+2, the terminal may miss the PDSCH received on CC2 in time slot n+3. According to the scheme of this embodiment, the DCI on CC1 in time slot n+3 indicates whether the PDSCH is received on CC0, CC2 and CC3 in time slot n+3 in addition to indicating that the PDSCH is received on CC1 in time slot n+3, so the terminal will not miss the PDSCH on CC2 in time slot n+3.

[0314] In a possible implementation, the network device sends the DCI in the first time unit and the second carrier unit, and the DCI indicates the index or position of the second carrier unit in the X carrier units for the terminal to receive the downlink signal. In this implementation, the network device indicates the index or position of the carrier unit where the DCI is located in the X carrier units for receiving the downlink signal when sending the DCI.

[0315] Among them, the DCI can have the following designs:

[0316] One possible design is that the DCI includes a bitmap (a field in the DCI), and the bitmap includes N bits, and the i-th bit in the N bits indicates whether the terminal receives the PDSCH (or receives the downlink signal) on the i-th carrier unit in the N carrier units, where 0≤i≤N-1 or 1≤i≤N. That is, the bitmap indicates the X carrier units for the terminal to receive the downlink signal.

[0317] One possible design is that the DCI includes a bitmap (a field in the DCI), which includes N bits, and the i th bit in the N bits indicates whether the terminal receives the PDSCH (or receives the downlink signal) on the i th carrier unit of the N carrier units in the first time unit, where 0≤i≤N-1 or 1≤i≤N. That is, the bitmap indicates the X carrier units used by the terminal to receive the downlink signal in the first time unit. For example, the DCI includes a bitmap including 4 bits, and each bit indicates whether the PDSCH is to be received on 1 CC of the slot in which the DCI is located. For example, the DCI in the slot n, CC0 and the DCI in the slot n, CC1 are both indicated by "1100" to receive the PDSCH on the slot n, CC0 and CC1, but not to receive the PDSCH on the slot n, CC2 and CC3. Assuming that the DCI in the slot n+2, CC0 is missed, the missed DCI position can be known through the bitmap in the DCI in the slot n+2, CC1. Figure 5

[0318] Another possible design is that the DCI includes second information, which indicates the terminal to receive the PDSCH (downlink signal) on the j th carrier unit of the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0319] Another possible design is that the DCI includes second information, which indicates the terminal to receive the PDSCH (downlink signal) on the j th carrier unit of the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0320] Another possible design is that the DCI includes second information, which indicates the terminal to receive the PDSCH (downlink signal) on the j th carrier unit of the N carrier units except the first carrier unit, where 0≤j≤N-2 or 1≤j≤N-1.

[0321] Another possible design is that the DCI includes second information, which indicates the terminal to receive the PDSCH (downlink signal) on the j th carrier unit of the N carrier units except the first carrier unit in the first time unit, where 0≤j≤N-2 or 1≤j≤N-1. That is, the cross indication can be used to avoid the network device and the terminal to understand the CC corresponding to the HARQ information bit in the HARQ codebook inconsistently. For example, the DCI includes a bitmap including 4 bits, and each bit indicates whether the PDSCH is to be received on 1 CC of the slot in which the DCI is located. For example, the DCI in the slot n, CC0 and the DCI in the slot n, CC1 are both indicated by "1100" to receive the PDSCH on the slot n, CC0 and CC1, but not to receive the PDSCH on the slot n, CC2 and CC3. Assuming that the DCI in the slot n+2, CC0 is missed, the missed DCI position can be known through the bitmap in the DCI in the slot n+2, CC1. Figure 5 ​For example, the network device is configured with 4 CCs, 2 bits (second information) can be added in the DCI. For example, the DCI on the CC0 indicates "01", indicating that the PDSCH is received on the CC1; correspondingly, the DCI on the CC1 indicates "00", indicating that the PDSCH is received on the CC0. For example, the DCI on the CC1 indicates "10" in the time slot n+3, indicating that the PDSCH is received on the CC2; correspondingly, the DCI on the CC2 indicates "01", indicating that the PDSCH is received on the CC1. Here, the second information can be understood as indicating that the terminal receives the downlink signal in the first time unit and in the jth carrier unit of the N carrier units except the first carrier unit in the X carrier units. The terminal blindly detects the PDCCH or receives the PDSCH in the jth carrier unit. The jth carrier unit is one of the X carrier units used by the terminal to receive the downlink signal. Correspondingly, the DCI detected by the terminal in the jth carrier unit indicates that the terminal receives the PDSCH in the first time unit and in the first carrier unit of the N carrier units. Or, the DCI detected by the terminal in the jth carrier unit indicates that the terminal receives the PDSCH in the first time unit and in the first carrier unit of the N carrier units, which is one of the X carrier units used to receive the downlink signal.

[0322] For example, the DCI includes the second information, and the second information indicates that the terminal receives the PDSCH in the first time unit and in the carrier unit except the first carrier unit of the N carrier units. The number of carrier units except the first carrier unit can be greater than or equal to 1.

[0323] For example, the DCI includes the second information, and the second information indicates that the terminal receives the PDSCH in the first time unit and in the carrier unit except the first carrier unit of the N carrier units. The number of carrier units except the first carrier unit can be greater than or equal to 1.

[0324] For example, the DCI includes the second information, and the second information indicates that the terminal receives the PDSCH in the first time unit and in the carrier unit except the first carrier unit of the N carrier units. The number of carrier units except the first carrier unit can be greater than or equal to 1.

[0325] In another possible design, the network device transmits the DCI in the first time unit and the second carrier unit, where the DCI indicates the terminal to receive the first downlink signal in the first time unit and the second carrier unit. In this method, the second carrier unit is the carrier unit in which the DCI is detected. Alternatively, the first carrier unit is the second carrier unit, and the terminal indicates the order of the carrier unit in which the current DCI is located among the X carrier units used to receive the downlink signal, without involving another carrier unit. The DCI includes third information, where the third information indicates that the second carrier unit is the kth carrier unit received by the terminal in the first time unit, where 0≤k≤X-1 or 1≤k≤X. For example, Figure 9 For example, the network device configures 4 CCs, and a bit (third information, which can be referred to as a counter DAI field) is added to the DCI, where the counter DAI field starts counting in each time slot. For example, in time slot n, the counter DAI field in the DCI on the CC0 has a count value of 0, and the counter DAI field in the DCI on the CC1 has a count value of 1, so that a maximum of 2 CCs can be determined. When the time slot is changed, the counter DAI field is cleared and starts counting again.

[0326] After the terminal receives the DCI, the terminal can accurately know whether to receive the PDSCH in the first time unit and the second carrier unit according to the DCI, thereby improving the reliability of communication.

[0327] In another possible implementation, the terminal receives at least one DCI (control information, or PDCCH) in the second resource set, where the second resource set includes M time units and X carrier units. The terminal generates the HARQ codebook information according to the at least one DCI. The X carrier units are X carrier units used by the terminal to receive the downlink signal in the N carrier units. For details, refer to the description in S401a / S401b.

[0328] The terminal receives at least one DCI in the second resource set, and further includes that the terminal starts from the first time unit of the M time units, and detects the DCI in the X carrier units used to receive the downlink signal in each time unit in ascending order of the time domain index. That is, the DCI is detected in the first resource set in the order of frequency first and time second.

[0329] The terminal generates the HARQ codebook information according to the at least one DCI, and further includes that the terminal generates the HARQ codebook information according to the decoding result of the PDSCH scheduled by the detected DCI. That is, ACK information is generated when the PDSCH decoding is successful, and NACK information is generated when the PDSCH decoding fails. Through this generation method of the HARQ codebook information, the terminal detects the carrier unit of the DCI, and thus the number of DCIs detected by the terminal can be reduced.

[0330] According to the communication method provided by the embodiment of the present application, the network device transmits the DCI on the first time unit and the first carrier unit, and the DCI can indicate the first data and / or information received on the first time unit and the second carrier unit. Even if the terminal does not receive the DCI itself on the first time unit and the second carrier unit, the terminal can accurately receive the first data and / or information on the first time unit and the second carrier unit, thereby improving the reliability of communication.

[0331] The above Figure 4 The embodiments shown in the above Figure 10 The embodiments shown in the above

[0332] It can be understood that the methods and / or steps implemented by the network device in each of the above embodiments can also be implemented by components (such as chips or circuits) that can be used for the network device; and the methods and / or steps implemented by the terminal can also be implemented by components (such as chips or circuits) that can be used for the terminal. When implemented by the components as described above, the receiving / sending can be understood as inputting / outputting, i.e., the components communicate with other components of the network device / terminal. In addition, the method implemented by the network device can also be divided into being executed by multiple execution subjects, for example, being divided into being executed by at least one of the CU, the DU, the RU, etc.; and the method implemented by the terminal can also be divided into being executed by multiple execution subjects, for example, being divided into being executed by multiple components for the terminal. The execution subjects can be logically and / or physically separated.

[0333] The above mainly introduces the scheme provided by the embodiments of the present application from the perspective of the interaction between the terminal and the network device. Accordingly, the embodiments of the present application also provide a communication apparatus, which is used to implement the various methods described above. The communication apparatus can be the network device in the above method embodiments, or a component that can be used for the network device; or the communication apparatus can be the terminal in the above method embodiments, or a component that can be used for the terminal. It can be understood that the communication apparatus contains the hardware structure and / or software module corresponding to the execution of each function in order to implement the above functions. Those skilled in the art should easily realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0334] The embodiments of the present application can divide the functions of the communication device according to the method embodiments described above, for example, each function module can be divided according to each function, or two or more functions can be integrated in one processing unit. The integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. When actually implemented, another division mode can be used.

[0335] Based on the same concept of the above communication method, the present application also provides a communication device as follows:

[0336] As shown in Figure 4 , a structural schematic diagram of a communication device provided by the embodiments of the present application, the communication device 1000 includes a transceiver unit 1001 and a processing unit 1002. Wherein:

[0337] Exemplarily, the transceiver unit 1001 can include a receiving unit and a sending unit, which can be an integral whole or independent units.

[0338] When the communication device 1000 is used to realize the functions of the terminal, the transceiver unit 1001 is configured to perform one or more operations of the terminal in steps S401a, S402 of the embodiment shown in Figure 9 ; or the transceiver unit 1001 is configured to perform the operation of the terminal in step S901 of the embodiment shown in Figure 4 .

[0339] When the communication device 1000 is used to realize the functions of the network device, the transceiver unit 1001 is configured to perform one or more operations of the network device in steps S401b, S402 of the embodiment shown in Figure 9 ; or the transceiver unit 1001 is configured to perform the operation of the network device in step S901 of the embodiment shown in Figure 4 .

[0340] For specific implementation of the transceiver unit 1001 and the processing unit 1002, reference can be made to the related description in the embodiments shown in Figure 9 , Figure 11 .

[0341] The division of the modules in the present application is illustrative, and is only a logical function division. When actually implemented, another division mode can be used. In addition, each function module in each example of the present application can be integrated in one processor, or can be a separate physical existence, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.

[0342] AsFigure 4 As shown in FIG. 11, the communication apparatus 1100 includes a processor 1101. Optionally, the communication apparatus 1100 further includes an interface circuit 1102 (shown in dashed line in the figure), and the processor 1101 and the interface circuit 1102 are coupled with each other. It can be understood that the interface circuit 1102 can be a transceiver or an input / output interface. Optionally, the communication apparatus 1100 further includes a memory 1103 (shown in dashed line in the figure), which is configured to store instructions executed by the processor 1101, or store input data required by the processor 1101 to execute instructions, or store data generated after the processor 1101 executes instructions.

[0343] When the communication apparatus 1100 is used to implement the function of the terminal, the interface circuit 1102 is configured to perform one or more operations of the terminal in steps S401a and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the terminal in step S901 of the method embodiment shown in FIG. 9. Figure 9 When the communication apparatus 1100 is used to implement the function of the terminal, the interface circuit 1102 is configured to perform one or more operations of the terminal in steps S401a and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the terminal in step S901 of the method embodiment shown in FIG. 9. Figure 4 When the communication apparatus 1100 is used to implement the function of the network device, the interface circuit 1102 is configured to perform one or more operations of the network device in steps S401b and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the network device in step S901 of the method embodiment shown in FIG. 9.

[0344] When the communication apparatus 1100 is used to implement the function of the network device, the interface circuit 1102 is configured to perform one or more operations of the network device in steps S401b and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the network device in step S901 of the method embodiment shown in FIG. 9. Figure 9 When the communication apparatus 1100 is used to implement the function of the network device, the interface circuit 1102 is configured to perform one or more operations of the network device in steps S401b and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the network device in step S901 of the method embodiment shown in FIG. 9. Figure 4 When the communication apparatus 1100 is used to implement the function of the network device, the interface circuit 1102 is configured to perform one or more operations of the network device in steps S401b and S402 of the method embodiment shown in FIG. 4; or the interface circuit 1102 is configured to perform the operation of the network device in step S901 of the method embodiment shown in FIG. 9.

[0345] The specific implementation of the processor 1101, the interface circuit 1102 and the memory 1103 can refer to the related description in the method embodiments shown in Figure 9 , ​ .

[0346] When the communication apparatus is a chip applied to the network device, the chip implements the function of the network device in the method embodiments. The chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the terminal to the network device; or the chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal.

[0347] When the communication apparatus is a chip applied to the terminal, the chip implements the function of the terminal in the method embodiments. The chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent by the network device to the terminal; or the chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent by the terminal to the network device.

[0348] In addition, it should be noted that the aforementioned transceiver unit and / or processing unit can be implemented by a virtual module, for example, the processing unit can be implemented by a software function unit or a virtual device, and the transceiver unit can be implemented by a software function or a virtual device. Alternatively, the processing unit or the transceiver unit can also be implemented by an entity device, for example, if the device is implemented by a chip / chip circuit, the transceiver unit can be an input / output circuit and / or a communication interface, which performs an input operation (corresponding to the aforementioned receiving operation) and an output operation (corresponding to the aforementioned sending operation); and the processing unit is an integrated processor or a microprocessor or an integrated circuit.

[0349] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0350] The embodiments of the present application further provide a computer readable storage medium, which stores a computer program or instructions, when the computer program or instructions are executed, the method in the above embodiments is implemented.

[0351] The embodiments of the present application further provide a computer program product containing instructions, when the instructions are run on a computer, the computer executes the method in the above embodiments.

[0352] The embodiments of the present application further provide a communication system, which comprises the communication device.

[0353] The embodiments of the present application further provide a circuit, which is coupled with a memory, and is used for executing the method shown in the above embodiments. The circuit can include a chip circuit.

[0354] The embodiments of the present application further provide a chip device, which comprises a processor, and is used for calling computer degrees or computer instructions stored in the memory, so that the processor executes the method provided in any one of the above method embodiments.

[0355] In a possible implementation manner, the input of the chip device corresponds to the receiving operation in any one of the above method embodiments, and the output of the chip device corresponds to the sending operation in any one of the above method embodiments.

[0356] Optionally, the processor is coupled with the memory through an interface.

[0357] Optionally, the chip device further comprises a memory, and the memory stores computer degree or computer instructions.

[0358] When the communication device is a module applied to a network device, the network device module implements the functions of the network device in the method embodiments. The network device module receives information from other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the UE to the network device; or the network device module sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the UE. The network device module herein can be a baseband chip of the network device, or a CU, a DU or other modules, or a device under the O-RAN architecture, such as an open CU, an open DU, etc.

[0359] It should be noted that one or more of the above units or units can be realized by software, hardware or a combination of both. When any of the above units or units is realized by software, the software exists in the form of computer program instructions and is stored in the memory, and the processor can be used to execute the program instructions and realize the above method flow.

[0360] In this application, the processor can be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, can realize or execute the methods, steps and logic block diagrams disclosed in this application. The general processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this application can be directly embodied as hardware processor execution or executed by a combination of hardware and software modules in the processor.

[0361] When the above units or units are realized by hardware, the hardware can be any one or any combination of CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, microcontroller unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, SoC, FPGA, programmable logic device (programmable logic device, PLD), special digital circuit, hardware accelerator or non-integrated discrete device, which can run necessary software or not dependent on software to execute the above method flow.

[0362] Optionally, the embodiment of the present application further provides a chip system, comprising: at least one processor and an interface, the at least one processor is coupled with a memory through the interface, when the at least one processor runs a computer program or instructions in the memory, the chip system executes the method in any of the method embodiments. Optionally, the chip system can be composed of a chip, or can contain a chip and other discrete devices, and the embodiment of the present application does not make specific limitation to this.

[0363] The memory in the present application can also be a circuit or other any device capable of realizing the storage function, used for storing program instructions and / or data. The memory can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited to this. For example, the memory can be a non-volatile memory such as a digital versatile disc (DVD), a hard disk drive (HDD) or a solid-state drive (SSD), etc., and can also be a volatile memory such as a random-access memory (RAM).

[0364] It can be understood that in the present application, "indication" can include direct indication, indirect indication, display indication, and implicit indication. When describing that certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A. In the present application, the information indicated by the indication information is referred to as the to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information, or the to-be-indicated information can be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only a part of the to-be-indicated information, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, a protocol stipulates), thereby reducing the indication overhead to a certain extent. The to-be-indicated information can be sent as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending occasion of the sub-information can be the same or different. The specific sending method is not limited in the present application. The sending period and / or sending occasion of the sub-information can be pre-defined, for example, pre-defined according to a protocol, or configured by a transmitting end device through sending configuration information to a receiving end device.

[0365] At least one of the terms, indicates one or more. More than one, refers to two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, B exists alone, and A, B can be single or multiple. The character " / " generally represents the relationship of "or" between the front and rear associated objects. In addition, it should be understood that although the terms first, second, etc. may be used in the present application to describe various objects, these objects should not be limited by these terms. These terms are only used to distinguish each object from each other. "At least one of the following" or similar expressions are used to represent any combination of the listed items; for example, at least one of A, B and (or) C can represent the following cases: A exists alone, B exists alone, C exists alone, A and B exist together, B and C exist together, A and C exist together, A, B and C exist together, and A, B, C can be single or multiple.

[0366] The terms "comprising" and "having" mentioned above and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. It should be noted that in the present application, the words "exemplary" or "for example" are used to represent an example, illustration or description. Any method or design described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other methods or design solutions. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific way.

[0367] A network element in a communication system can send a signal to another network element or receive a signal from another network element. The signal can include information, signaling or data, etc. The network element can also be replaced by an entity, network entity, device, UE, communication module, node, communication node, etc. In the present application, the network element is taken as an example for description. For example, the communication system can include at least one UE and at least one network device. The network device can send a downlink signal to the UE, and / or the UE can send an uplink signal to the network device. In addition, it can be understood that if the communication system includes multiple UEs, the multiple UEs can also send signals to each other, that is, the sending network element and the receiving network element of the signal can be UEs.

[0368] In the above embodiments, all or part can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode.

[0369] Although the present application is described herein in conjunction with various embodiments, other variations and modifications of the disclosed embodiments can be understood and implemented by those skilled in the art through viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. Some measures described in mutually different dependent claims can be combined and produce a good result.

[0370] It can be understood that various numerical numbers involved in the embodiments of the present application are only for convenient differentiation and do not limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined by its function and inherent logic.

[0371] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the relevant description of other embodiments.

[0372] The components in the device of the embodiments of the present application can be combined, divided and deleted according to actual needs. Those skilled in the art can combine or combine the features of different embodiments and different embodiments described in the specification.

[0373] In this application, under the premise of no logical contradiction, examples can be referred to each other, for example, methods and / or terms between method embodiments can be referred to each other, for example, functions and / or terms between device embodiments can be referred to each other, and for example, functions and / or terms between device examples and method examples can be referred to each other.

Claims

1. A communication method, characterized in that, The method includes: Based on the number of carrier units X within a time unit, determine the positions of L candidate Physical Downlink Shared Channels (PDSCHs) on the first resource set. The first resource set includes M time units and N carrier units, where X, L, M, and N are all positive integers, and X ≤ N. Receive PDSCH at the L candidate PDSCH locations; Send a hybrid automatic repeater (HARQ) codebook, which includes Y HARQ information bits. The HARQ information bits are used to indicate whether the PDSCH was successfully received, where Y is a positive integer and Y≥L.

2. The method as described in claim 1, characterized in that, X carrier units are carrier units used to receive downlink signals. The X carrier units are carrier units among the N carrier units, which are configured by the network device.

3. The method as described in claim 1 or 2, characterized in that, The method further includes: Sending first information, the first information indicating a maximum number W of carrier units within a time unit, X ≤ W, and / or, the first information indicating at least one set of downlink carrier units, the number of downlink carrier units in the at least one set of downlink carrier units being less than or equal to W, X being determined based on the at least one set of downlink carrier units; wherein, the first information is terminal capability information; and / or The network device receives second information indicating X and / or at least one set of downlink carrier units, wherein the sum of the number of different downlink carrier units in the at least one set of downlink carrier units is X, or the number of downlink carrier units in the at least one set of downlink carrier units is less than or equal to X.

4. The method according to any one of claims 1-3, characterized in that, The step of determining L candidate PDSCH positions on the first resource set based on the number X of carrier units within a time unit includes: Determine the candidate PDSCH positions within the X carrier units of the time unit with the smallest index among the M time units. Then, determine the candidate PDSCH positions on the X carrier units corresponding to each of the M time units in ascending order of their indices, thereby obtaining the L candidate PDSCH positions.

5. The method according to any one of claims 1-4, characterized in that, The X carrier units are the X carrier units with the most candidate PDSCH positions among the N carrier units, and X≤N.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: Downlink control information (DCI) is received in the first time unit and the first carrier unit, and the DCI schedules the downlink signal. The DCI includes a bitmap comprising N bits, wherein the i-th bit of the N bits indicates whether the terminal receives a downlink signal on the i-th carrier unit of the N carrier units within the first time unit, where 0 ≤ i ≤ N-1; or The DCI includes second information, which instructs the terminal to receive a downlink signal on the j-th carrier unit (excluding the first carrier unit) out of N carrier units within the first time unit, where 0 ≤ j ≤ N-2; or The DCI includes third information, which indicates that the first carrier unit is the kth carrier unit received by the terminal within the first time unit, where 0 ≤ k ≤ X-1.

7. The method according to any one of claims 1-6, characterized in that, The X carrier units correspond to at least two subcarrier intervals, including a first subcarrier interval and a second subcarrier interval. The first subcarrier interval is smaller than the second subcarrier interval. One time unit of the carrier unit corresponding to the first subcarrier interval corresponds to the time units of H carrier units corresponding to the second subcarrier interval. The carrier unit corresponding to the first subcarrier interval belongs to the X carrier units corresponding to the first time unit among the time units of the H carrier units corresponding to the second subcarrier interval, or the carrier unit corresponding to the first subcarrier interval belongs to the X carrier units corresponding to the last time unit among the time units of the H carrier units corresponding to the second subcarrier interval.

8. The method according to any one of claims 1-7, characterized in that, The candidate PDSCH positions may be the same or different within each time unit.

9. The method according to any one of claims 1-8, characterized in that, One of the L candidate PDSCH positions corresponds to at least one HARQ information bit.

10. A communication method, characterized in that, The method includes: Based on the number of carrier units X of the terminal in a time unit, determine the positions of L candidate physical downlink shared channels (PDSCH) on the first resource set. The first resource set includes M time units and N carrier units, where X, L, M, and N are all positive integers, and X ≤ N. Send PDSCH at the L candidate PDSCH positions; Receive a hybrid automatic repeater (HARQ) codebook, which includes Y HARQ information bits. The HARQ information bits are used to indicate whether the PDSCH was successfully received, where Y is a positive integer and Y≥L.

11. The method as described in claim 10, characterized in that, X carrier units are carrier units used to receive downlink signals. The X carrier units are carrier units among the N carrier units, which are configured by the network device.

12. The method as described in claim 10 or 11, characterized in that, The method further includes: Receive first information, the first information indicating a maximum number W of carrier units within a time unit, X ≤ W, and / or, the first information indicating at least one set of downlink carrier units, the number of downlink carrier units in the at least one set of downlink carrier units being less than or equal to W, X being determined based on the at least one set of downlink carrier units; wherein, the first information is terminal capability information; and / or Send a second message indicating X and / or at least one set of downlink carrier units, wherein the sum of the number of different downlink carrier units in the at least one set of downlink carrier units is X, or the number of downlink carrier units in the at least one set of downlink carrier units is less than or equal to X.

13. The method according to any one of claims 10-12, characterized in that, The step of determining L candidate PDSCH positions on the first resource set based on the number X of carrier units in a time unit of the terminal includes: Determine the candidate PDSCH positions within the X carrier units of the time unit with the smallest index among the M time units. Then, determine the candidate PDSCH positions on the X carrier units corresponding to each of the M time units in ascending order of their indices, thereby obtaining the L candidate PDSCH positions.

14. The method according to any one of claims 10-13, characterized in that, The X carrier units are the X carrier units with the most candidate PDSCH positions among the N carrier units, and X≤N.

15. The method according to any one of claims 10-14, characterized in that, The method further includes: Downlink Control Information (DCI) is transmitted within the first time unit and the first carrier unit, and the DCI schedules the downlink signal. The DCI includes a bitmap comprising N bits, wherein the i-th bit of the N bits indicates whether the terminal receives a downlink signal on the i-th carrier unit of the N carrier units within the first time unit, where 0 ≤ i ≤ N-1; or The DCI includes second information, which instructs the terminal to receive a downlink signal on the j-th carrier unit (excluding the first carrier unit) out of N carrier units within the first time unit, where 0 ≤ j ≤ N-2; or The DCI includes third information, which indicates that the first carrier unit is the kth carrier unit received by the terminal within the first time unit, where 0 ≤ k ≤ X-1.

16. The method according to any one of claims 10-15, characterized in that, The X carrier units correspond to at least two subcarrier intervals, including a first subcarrier interval and a second subcarrier interval. The first subcarrier interval is smaller than the second subcarrier interval. One time unit of the carrier unit corresponding to the first subcarrier interval corresponds to the time units of H carrier units corresponding to the second subcarrier interval. The carrier unit corresponding to the first subcarrier interval belongs to the X carrier units corresponding to the first time unit among the time units of the H carrier units corresponding to the second subcarrier interval, or the carrier unit corresponding to the first subcarrier interval belongs to the X carrier units corresponding to the last time unit among the time units of the H carrier units corresponding to the second subcarrier interval.

17. The method according to any one of claims 10-16, characterized in that, The candidate PDSCH positions may be the same or different within each time unit.

18. The method according to any one of claims 10-17, characterized in that, One of the L candidate PDSCH positions corresponds to at least one HARQ information bit.

19. A communication method, characterized in that, The method includes: Receive downlink control information (DCI), the DCI indicating that a first downlink signal is received on a first time unit and a second carrier unit.

20. The method as described in claim 19, characterized in that, The receiving of DCI includes: The DCI is received in the first time unit and the first carrier unit, and the DCI also indicates that a second downlink signal is received in the first time unit and the first carrier unit.

21. A communication method, characterized in that, The method includes: Send downlink control information (DCI), which instructs the transmission of a first downlink signal on a first time unit and a second carrier unit.

22. The method as described in claim 21, characterized in that, The sending of DCI includes: The DCI is transmitted in the first time unit and the first carrier unit, and the DCI also indicates that a second downlink signal is received in the first time unit and the first carrier unit.

23. The method as described in claim 20 or 22, characterized in that, The first carrier unit and the second carrier unit belong to N carrier units, where N is a positive integer. The DCI includes a bit map, which includes N bits. The i-th bit in the N bits indicates whether the terminal receives a downlink signal on the i-th carrier unit in the N carrier units within the first time unit, where 0≤i≤N-1.

24. The method as described in claim 20 or 22, characterized in that, The first carrier unit and the second carrier unit belong to N carrier units, where N is a positive integer. The DCI includes second information, which indicates that the terminal receives a downlink signal on the j-th carrier unit (excluding the first carrier unit) among the N carrier units within the first time unit, where 0 ≤ j ≤ N-2.

25. The method according to any one of claims 19-22, characterized in that, The DCI includes third information, which indicates that the second carrier unit is the kth carrier unit received by the terminal in the first time unit, where 0≤k≤X-1, and X is the number of carrier units used by the terminal to receive downlink signals in a time unit.

26. A communication device, characterized in that, It includes units for implementing the method as described in any one of claims 1-9, or units for implementing the method as described in any one of claims 10-18, or units for implementing the method as described in any one of claims 19, 20, 23-25, or units for implementing the method as described in any one of claims 21-25.

27. A communication device, characterized in that, The device includes a processor, characterized in that the processor is configured such that when the communication device executes the computer program, it implements the method as claimed in any one of claims 1-9, or the method as claimed in any one of claims 10-18, or the method as claimed in any one of claims 19, 20, 23-25, or the method as claimed in any one of claims 21-25.

28. A computer-readable storage medium, characterized in that, The storage medium stores a computer program or instructions that, when executed, cause the method as described in any one of claims 1-9 to be implemented, or cause the method as described in any one of claims 10-18 to be implemented, or cause the method as described in any one of claims 19, 20, 23-25 ​​to be implemented, or cause the method as described in any one of claims 21-25 to be implemented.

29. A computer program product, characterized in that, The computer program product includes program instructions that, when executed, cause the method as described in any one of claims 1-9 to be implemented, or cause the method as described in any one of claims 10-18 to be implemented, or cause the method as described in any one of claims 19, 20, 23-25 ​​to be implemented, or cause the method as described in any one of claims 21-25 to be implemented.

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