Wireless communication method and communication device

Abstract

The present application provides a wireless communication method and a communication apparatus. The wireless communication method includes a terminal device transmitting first information on a first carrier to a network device, the first information is for determining channel information on the first carrier, the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or a spectral efficiency on the first carrier. The terminal device receives second information from the network device, the second information is for scheduling transmission resources on a second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes an MCS and / or a spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the channel information on the first carrier. According to the communication method, a multi-carrier transmission rate can be increased and a spectral utilization efficiency can be improved, so that a system transmission performance can be improved.

Description

Technical Field

[0001] This application claims the benefit of Chinese Patent Application No. 202111040607.9, titled "WIRELESS COMMUNICATION METHOD AND COMMUNICATION APPARATUS", filed with the State Intellectual Property Office of China on September 6, 2021, the entire content of which is incorporated herein by reference.

[0002] Embodiments of this application relate to the field of communications, and more specifically, to wireless communication methods and communication apparatuses.

Background Art

[0003] With the demand for increasing network capacity, the use of frequency division duplex (FDD) spectrum resources is particularly important. Currently, in order to implement FDD carrier aggregation, support a higher transmission bandwidth, and increase the spectrum usage of user equipment (UE), carrier aggregation (CA) technology has been introduced.

[0004] However, when a UE needs to communicate a large amount of data, channel measurement usually needs to be performed on multiple activated carriers. Before the channel measurement results are obtained, the channel information on the aforementioned carriers is unknown. As a result, the transmission rate of multi-carriers decreases. Furthermore, the system transmission performance is affected. Therefore, how to increase the multi-carrier transmission rate and improve the system transmission performance is an urgent problem to be solved.

Summary of the Invention

[0005] This application provides a wireless communication method and a communication apparatus, which increase the multi-carrier transmission rate and improve the system transmission performance.

Means for Solving the Problems

[0006] According to a first aspect, a wireless communication method is provided. The method may be implemented by a terminal device or may be implemented by a chip or circuit used in the terminal device. This is not limited in the present application. For ease of explanation, hereinafter, an example in which the method is implemented by a terminal device will be used for description.

[0007] The method includes that the terminal device transmits first information to a network device on a first carrier, where the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier. The terminal device receives second information from the network device, where the second information is for scheduling transmission resources on a second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the channel information on the first carrier.

[0008] According to the solution provided in the present application, the MCS and / or spectral efficiency on another carrier (for example, the second carrier) for which channel information is not fed back is obtained based on the MCS and / or spectral efficiency on the first carrier. In other words, the transmission resources on the second carrier can be scheduled without performing time / frequency synchronization and channel measurement on the second carrier. According to this method, the spectral utilization efficiency can be improved, the transmission rate before channel information is fed back on another carrier can be improved, as a result, the system transmission delay is reduced and the system transmission performance is improved.

[0009] Note that the channel information regarding the first carrier and the channel information regarding the second carrier are real-time shared channel information. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. The real-time channel information is current and instantaneous channel information. The channel information may change rapidly over time, for example, channel quality indication (CQI), MCS, spectral efficiency, and optimal beam direction.

[0010] In this embodiment, a plurality of carriers (for example, the first carrier and the second carrier) may belong to a plurality of cells, that is, carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0011] The second information indicates that the terminal device can carry a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0012] For example, the terminal device receiving the second information from the network device can be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0013] For example, the second information may be DCI. When the DCI is carried on the first carrier, the terminal device needs to receive the DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor the DCI can be reduced. Optionally, when the DCI is carried on the second carrier, the terminal device needs to receive the DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0014] Optionally, the technical solution in this application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0015] In relation to the first aspect, in some embodiments of the first aspect, the terminal device transmits third information to the network device, the third information indicates first association information, the first association information indicates channel difference information between the first carrier and the second carrier, and the channel information on the second carrier is determined based on the first association information and the first information.

[0016] In this embodiment, the network device further determines the channel information regarding the second carrier by using the first information (channel information regarding the first carrier) in combination with the third information (channel difference information between the first carrier and the second carrier), and as a result, the accuracy of the channel information regarding the second carrier can be guaranteed.

[0017] The first association information may include a path loss difference between a first carrier and a second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship, etc.

[0018] For example, when the reference signal received power (RSRP) on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0019] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0020] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1 (including V - 2 and V + 1), and as a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCS V0 to V on the second carrier. The terminal device can, based on the received channel information (for example, MCS is U) on the first carrier and the MCS correspondence relationship, obtain the channel information (for example, MCS is V) on the second carrier. 27 corresponding. The terminal device can, based on the received channel information (for example, MCS is U) on the first carrier and the MCS correspondence relationship, obtain the channel information (for example, MCS is V) on the second carrier.U can be determined).

[0021] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0022] According to a second aspect, a wireless communication method is provided. The method may be implemented by a terminal device, or may be implemented by a chip or circuit used in the terminal device. This is not limited in this application. For ease of explanation, hereinafter, an example in which the method is implemented by a terminal device will be used for explanation.

[0023] The method includes: The terminal device receives channel information on a first carrier and second association information from a network device, the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, and the second association information indicates channel difference information between the first carrier and a second carrier. The terminal device determines channel information on the second carrier based on the channel information on the first carrier and the second association information, and the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier.

[0024] According to the solution provided in this application, the MCS and / or spectral efficiency on another carrier (e.g., the second carrier) for which channel information is not fed back are obtained based on the MCS and / or spectral efficiency on the first carrier. In other words, without performing time / frequency synchronization and channel measurement on the second carrier, the transmission resources on the second carrier can be scheduled. According to this method, the spectral utilization efficiency can be improved, the transmission rate before channel information is fed back on another carrier can be improved, as a result, the system transmission delay is reduced and the system transmission performance is improved.

[0025] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity and can be channel information shared by two carriers, including path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. Channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0026] In this embodiment, a plurality of carriers (e.g., the first carrier and the second carrier) may belong to a plurality of cells, i.e., carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0027] The second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0028] For example, the terminal device receiving the second information from the network device may be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0029] For example, the second information may be DCI. When the DCI is carried on the first carrier, the terminal device needs to receive the DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor the DCI can be reduced. Optionally, when the DCI is carried on the second carrier, the terminal device needs to receive the DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0030] Optionally, the technical solution in this application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0031] Referring to the second aspect, in some embodiments of the second aspect, the terminal device receives the second information from the network device, and the second information is for scheduling transmission resources on the second carrier. The terminal device communicates with the network device by using the transmission resources on the second carrier based on the second information and the channel information on the second carrier.

[0032] In relation to the second aspect, in some embodiments of the second aspect, the terminal device transmits first information on a first carrier to the network device, and the first information is for determining channel information on the first carrier.

[0033] In relation to the second aspect, in some embodiments of the second aspect, the terminal device transmits third information to the network device, the third information indicates first association information, the first association information is for determining second association information, and the first association information indicates unupdated channel difference information between the first carrier and the second carrier.

[0034] In this embodiment, the second association information is updated based on the first association information. It can be understood that the second association information is determined by the network device based on the current system resource allocation situation and has better compatibility and flexibility.

[0035] The first association information may include a path loss difference, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship between the first carrier and the second carrier.

[0036] For example, when the reference signal received power (RSRP) on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, the channel information on the second carrier can be determined to include MCS W and / or spectral efficiency W.

[0037] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is such that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0038] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1, and as a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U ) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0039] Note that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0040] In relation to the first aspect or the second aspect, in some embodiments, the first association information or the second association information includes one or more of the following information, namely, the propagation path loss difference, the antenna efficiency difference, the optimal beam difference, the MCS correspondence relationship, and the spectral efficiency correspondence relationship.

[0041] In relation to the first aspect or the second aspect, in some embodiments, the value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) satisfies, where Δ is the propagation path loss difference between the second carrier and the first carrier, and Z is the spectral efficiency corresponding to the index U of the real - time MCS on the first carrier.

[0042] For example, the spectral efficiency on the second carrier can alternatively be any value within 0.6W to 1.2W. Therefore, the value range of the index of the real - time MCS on the second carrier may be [V - 2, V + 1], where V corresponds to the real - time spectral efficiency W.

[0043] Optionally, the value range of the spectral efficiency on the second carrier is, for example, [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0044] It should be noted that the value range of the spectral efficiency on the second carrier is only an example for illustration and should not constitute any limitation to the technical solution in this application.

[0045] In relation to the first aspect or the second aspect, in some embodiments, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10log 10 ((2 W - 1) / (2 Z - 1)) satisfies, where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier.

[0046] In relation to the first aspect or the second aspect, in some embodiments, the first information includes one or more of the following information, namely, the reference signal received power (RSRP) on the first carrier, the reference signal received quality (RSRQ) on the first carrier, the channel quality indicator (CQI) on the first carrier, the sounding reference signal (SRS) on the first carrier, the acknowledgement (ACK) or negative acknowledgement (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information on the first carrier.

[0047] By way of example and not limitation, the network device can send the fourth information to the terminal device.

[0048] Therefore, the terminal device receives the fourth indication information from the network device.

[0049] The fourth information is for scheduling the transmission resources on both the first carrier and the second carrier.

[0050] For example, the fourth information indicates the channel information regarding the first carrier and the second carrier. That is, the terminal device communicates the resources on the first carrier and the second carrier based on the fourth information.

[0051] Optionally, the fourth information includes channel information on the first carrier. For example, after determining the channel information on the first carrier based on the first information, the network device refers to the first association information between multiple carriers to determine updated second association information, and transmits the second association information to the terminal device. Then, when transmitting the fourth information for scheduling the transmission resources on the first carrier and the second carrier, the network device can transmit the channel information on the first carrier to the terminal device. The terminal device obtains the channel information on the second carrier from the second association information based on the channel information on the first carrier, and communicates resources on both the first carrier and the second carrier.

[0052] In this embodiment, various scheduling requirements for communication can be implemented, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission rate before the channel information is fed back on the second carrier can be improved, and as a result, the system transmission performance can be improved.

[0053] According to a third aspect, a wireless communication method is provided. The method may be implemented by a network device, or may be implemented by a chip or circuit used in the network device. This is not limited in this application. For ease of explanation, hereinafter, an example where the method is implemented by a network device is used for description.

[0054] The method includes steps in which a network device receives first information from a terminal device on a first carrier, where the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier. The network device transmits second information to the terminal device, where the second information is for scheduling transmission resources on a second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the channel information on the first carrier.

[0055] According to the solution provided in the present application, the MCS and / or spectral efficiency on another carrier (for example, the second carrier) for which channel information is not fed back is obtained based on the MCS and / or spectral efficiency on the first carrier. In other words, the transmission resources on the second carrier can be scheduled without performing time / frequency synchronization and channel measurement on the second carrier. According to this method, the spectral utilization efficiency can be improved, the transmission rate before channel information is fed back on another carrier can be improved, as a result, the system transmission delay is reduced, and the system transmission performance is improved.

[0056] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity and can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0057] In this embodiment, a plurality of carriers (e.g., a first carrier and a second carrier) may belong to a plurality of cells, i.e., carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0058] The second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier. For example, the terminal device receiving the second information from the network device can be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0059] For example, the second information can be DCI. When DCI is carried on the first carrier, the terminal device needs to receive DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor DCI can be reduced. Optionally, when DCI is carried on the second carrier, the terminal device needs to receive DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0060] Optionally, the technical solution in the present application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0061] In relation to the third aspect, in some embodiments of the third aspect, the network device determines channel information on the first carrier based on the first information. The network device determines channel information on the second carrier based on the channel information on the first carrier.

[0062] In this embodiment, the network device sequentially determines the channel information on the first carrier and the channel information on the second carrier, and then schedules the transmission resources on the first carrier and / or the transmission resources on the second carrier.

[0063] In relation to the third aspect, in some embodiments of the third aspect, the network device receives third information from the terminal device, the third information indicates first association information, and the first association information indicates channel difference information between the first carrier and the second carrier. The network device determines the channel information on the second carrier based on the first association information and the first information.

[0064] In this embodiment, the network device further determines channel information regarding a second carrier by using first information (channel information regarding a first carrier) in combination with third information (channel difference information between the first carrier and the second carrier), and as a result, the accuracy of the channel information regarding the second carrier can be guaranteed.

[0065] The first association information may include a path loss difference between the first carrier and the second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship.

[0066] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0067] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is such that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0068] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U ) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0069] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0070] According to a fourth aspect, a wireless communication method is provided. The method may be implemented by a network device, or may be implemented by a chip or a circuit used in the network device. This is not limited in this application. For the sake of easy explanation, hereinafter, an example in which the method is implemented by a network device is used for description.

[0071] The method is that a network device transmits channel information on a first carrier and second association information to a terminal device, where the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, the second association information indicates channel difference information between the first carrier and a second carrier, the channel information on the first carrier and the second association information are for determining channel information on the second carrier, and the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier.

[0072] According to the solution provided in the present application, the MCS and / or spectral efficiency on another carrier (for example, the second carrier) for which channel information is not fed back is obtained based on the MCS and / or spectral efficiency on the first carrier. In other words, without performing time / frequency synchronization and channel measurement on the second carrier, the transmission resources on the second carrier can be scheduled. According to this method, the spectral utilization efficiency can be improved, the transmission rate before channel information is fed back on another carrier can be improved, as a result, the system transmission delay is reduced and the system transmission performance is improved.

[0073] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity and can be channel information shared by two carriers, including path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0074] In this embodiment, a plurality of carriers (e.g., a first carrier and a second carrier) may belong to a plurality of cells, i.e., carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0075] The second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0076] For example, the terminal device receiving the second information from the network device may be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0077] For example, the second information may be DCI. When DCI is carried on the first carrier, the terminal device needs to receive DCI on the first carrier. In this embodiment, the overhead of monitoring DCI by the terminal device can be reduced. Optionally, when DCI is carried on the second carrier, the terminal device needs to receive DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0078] Optionally, the technical solution in the present application is also applicable to scheduling both Carrier 1 and Carrier 2. That is, the UE communicates resources on both Carrier 1 and Carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0079] In relation to the fourth aspect, in some embodiments of the fourth aspect, the network device transmits second information to the terminal device, and the second information is for scheduling transmission resources on the second carrier.

[0080] In relation to the fourth aspect, in some embodiments of the fourth aspect, the network device receives first information from the terminal device on the first carrier. The network device determines channel information on the first carrier based on the first information.

[0081] In relation to the fourth aspect, in some embodiments of the fourth aspect, the network device receives third information from the terminal device, the third information indicates first association information, and the first association information indicates unupdated channel difference information between the first carrier and the second carrier. The network device determines second association information based on the first association information.

[0082] In this embodiment, the second association information is updated based on the first association information. It can be understood that the second association information is determined by the network device based on the current system resource allocation situation and has better compatibility and flexibility.

[0083] The first association information may include a path loss difference between the first carrier and the second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship, etc.

[0084] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0085] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0086] For example, the path loss difference in the first association relationship is Δ dB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U in this case) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0087] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0088] In relation to the third aspect or the fourth aspect, in some embodiments, the first association information or the second association information includes one or more of the following information, namely, propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectral efficiency correspondence relationship.

[0089] In relation to the third aspect or the fourth aspect, in some embodiments, the value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) satisfies the condition, where Δ is the propagation path loss difference between the second carrier and the first carrier, and Z is the spectral efficiency corresponding to the index U of the real-time MCS on the first carrier.

[0090] For example, the spectral efficiency on the second carrier can alternatively be any value within the range of 0.6W to 1.2W. Therefore, the value range of the index of the real-time MCS on the second carrier may be [V - 2, V + 1], where V corresponds to the real-time spectral efficiency W.

[0091] Optionally, the value range of the spectral efficiency on the second carrier is [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0092] It should be noted that the value range of the spectral efficiency on the second carrier is only an example for illustration and should not constitute any limitation to the technical solution in this application.

[0093] In relation to the third aspect or the fourth aspect, in some embodiments, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10 log 10 ((2 W - 1) / (2 Z - 1)) satisfies, where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier.

[0094] Regarding the third or fourth aspect, in some embodiments, the first information includes one or more of the following information, namely, the reference signal received power (RSRP) of the first carrier, the reference signal received quality (RSRQ) of the first carrier, the channel quality indicator (CQI) of the first carrier, the sounding reference signal (SRS) of the first carrier, the acknowledgement (ACK) or negative acknowledgement (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information of the first carrier.

[0095] By way of example and not limitation, the network device can send the fourth information to the terminal device.

[0096] Therefore, the terminal device receives the fourth indication information from the network device.

[0097] The fourth information is for scheduling transmission resources on both the first carrier and the second carrier.

[0098] For example, the fourth information indicates channel information regarding the first carrier and the second carrier. That is, the terminal device communicates resources on the first carrier and the second carrier based on the fourth information.

[0099] Optionally, the fourth information includes channel information on the first carrier. For example, after determining the channel information on the first carrier based on the first information, the network device refers to the first association information between a plurality of carriers to determine updated second association information, and transmits the second association information to the terminal device. Then, when transmitting the fourth information for scheduling the transmission resources on the first carrier and the second carrier, the network device can transmit the channel information on the first carrier to the terminal device. The terminal device obtains the channel information on the second carrier from the second association information based on the channel information on the first carrier, and communicates resources on both the first carrier and the second carrier.

[0100] In this embodiment, various scheduling requirements for communication can be implemented, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission speed before the channel information on the second carrier is fed back can be improved, and as a result, the system transmission performance can be improved.

[0101] According to a fifth aspect, a wireless communication device is provided. The wireless communication device is a transceiver unit used by a terminal device to transmit first information to a network device on a first carrier. The first information is for determining channel information on the first carrier. The channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier. The second information is used by the terminal device to receive from the network device. The second information is for scheduling transmission resources on a second carrier. The second information indicates channel information on the second carrier. The channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier. The channel information on the second carrier is determined based on the channel information on the first carrier, and includes a transceiver unit.

[0102] Note that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. Channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0103] In this embodiment, a plurality of carriers (for example, the first carrier and the second carrier) may belong to a plurality of cells, that is, carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0104] The second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and the terminal device can receive downlink data or transmit uplink data on the corresponding second carrier.

[0105] For example, the terminal device receiving the second information from the network device may be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0106] For example, the second information may be DCI. When the DCI is carried on the first carrier, the terminal device needs to receive the DCI on the first carrier. In this embodiment, the overhead for monitoring the DCI by the terminal device can be reduced. Optionally, when the DCI is carried on the second carrier, the terminal device needs to receive the DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0107] Optionally, the technical solution in the present application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0108] In connection with the fifth aspect, in some embodiments of the fifth aspect, the transceiver unit is further used by the terminal device to send third information to the network device, the third information indicates first association information, the first association information indicates channel difference information between the first carrier and the second carrier, and the channel information on the second carrier is determined based on the first association information and the first information.

[0109] In this embodiment, the network device further determines the channel information regarding the second carrier by using the first information (channel information regarding the first carrier) in combination with the third information (channel difference information between the first carrier and the second carrier), and as a result, the accuracy of the channel information regarding the second carrier can be guaranteed.

[0110] The first association information may include a path loss difference between a first carrier and a second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship, etc.

[0111] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0112] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0113] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U on the second carrier) based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0114] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0115] According to a sixth aspect, a wireless communication device is provided. The wireless communication device is a transceiver unit used by a terminal device to receive channel information of a first carrier and second association information from a network device. The channel information of the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency of the first carrier, and the second association information indicates channel difference information between the first carrier and a second carrier. The wireless communication device further includes a processing unit used by the terminal device to determine channel information of the second carrier based on the channel information of the first carrier and the second association information. The channel information of the second carrier includes the MCS and / or spectral efficiency of the second carrier.

[0116] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity and can be shared by two carriers, and includes path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0117] In this embodiment, a plurality of carriers (e.g., a first carrier and a second carrier) may belong to a plurality of cells, i.e., carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0118] The second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0119] For example, the terminal device receiving the second information from the network device may be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0120] For example, the second information may be DCI. When DCI is carried on the first carrier, the terminal device needs to receive DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor DCI can be reduced. Optionally, when DCI is carried on the second carrier, the terminal device needs to receive DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0121] Optionally, the technical solution in the present application is also applicable to scheduling both Carrier 1 and Carrier 2. That is, the UE communicates resources on both Carrier 1 and Carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0122] In connection with the sixth aspect, in some embodiments of the sixth aspect, the transceiver unit is further used by the terminal device to receive second information from the network device, and the second information is for scheduling transmission resources on the second carrier, and based on the second information and the channel information on the second carrier, it is used by the terminal device to communicate with the network device by using the transmission resources on the second carrier.

[0123] In connection with the sixth aspect, in some embodiments of the sixth aspect, the transceiver unit is further used by the terminal device to transmit first information to the network device on the first carrier, and the first information is for determining channel information on the first carrier.

[0124] In connection with the sixth aspect, in some embodiments of the sixth aspect, the transceiver unit is further used by the terminal device to transmit third information to the network device, the third information indicates first association information, the first association information is for determining second association information, and the first association information indicates unupdated channel difference information between the first carrier and the second carrier.

[0125] In this embodiment, the second association information is updated based on the first association information. It can be understood that the second association information is determined by the network device based on the current system resource allocation situation, and has better compatibility and flexibility.

[0126] The first association information may include the path loss difference between the first carrier and the second carrier, the past MCS correspondence relationship, and / or the past spectrum efficiency correspondence relationship, etc.

[0127] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectrum efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectrum efficiency W.

[0128] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectrum efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectrum efficiency W.

[0129] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V on the second carrier.27 corresponds to. Based on the received channel information on the first carrier (for example, the MCS is U) and the MCS correspondence relationship, the terminal device can determine the channel information on the second carrier (for example, the MCS is V U is).

[0130] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control RRC signaling. This is not specifically limited in this application.

[0131] In relation to the fifth aspect or the sixth aspect, in some embodiments, at least one of the first association information or the second association information includes one or more of the following information, namely, propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectral efficiency correspondence relationship.

[0132] Referring to the fifth aspect or the sixth aspect, in some embodiments, the value range of the real-time spectral efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) satisfies, where Δ is the propagation path loss difference between the second carrier and the first carrier, and Z is the spectral efficiency corresponding to the index U of the real-time MCS on the first carrier.

[0133] For example, the spectral efficiency on the second carrier can alternatively be any value within 0.6W to 1.2W. Therefore, the value range of the index of the real-time MCS on the second carrier can also be [V - 2, V + 1], where V corresponds to the real-time spectral efficiency W.

[0134] Optionally, the value range of the spectral efficiency on the second carrier is [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0135] It should be noted that the value range of the spectral efficiency on the second carrier is only an example for explanation and should not constitute any limitation to the technical solution in this application.

[0136] In relation to the fifth or sixth aspect, in some embodiments, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10log 10 ((2 W - 1) / (2 Z - 1)) where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier.

[0137] In relation to the fifth or sixth aspect, in some embodiments, the first information includes one or more of the following information, namely, the reference signal received power (RSRP) of the first carrier, the reference signal received quality (RSRQ) of the first carrier, the channel quality indicator (CQI) of the first carrier, the sounding reference signal (SRS) of the first carrier, the acknowledgment (ACK) or negative acknowledgment (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information of the first carrier.

[0138] According to a seventh aspect, a wireless communication device is provided. The wireless communication device is a transceiver unit used by a network device to receive first information from a terminal device on a first carrier. The first information is for determining channel information on the first carrier. The channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier. The transceiver unit is further used by the network device to transmit second information to the terminal device. The second information is for scheduling transmission resources on a second carrier. The second information indicates channel information on the second carrier. The channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier. The channel information on the second carrier is determined based on the channel information on the first carrier. The wireless communication device includes the transceiver unit.

[0139] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the carrier granularity and can be shared by two carriers, including path loss, optimal beam direction, etc. Real-time channel information is the current and instantaneous channel information. The channel information may change rapidly over time, such as CQI, MCS, spectral efficiency, and optimal beam direction.

[0140] In this embodiment, multiple carriers (e.g., the first carrier and the second carrier) may belong to multiple cells, i.e., carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, multiple carriers may alternatively belong to the same cell. That is, one cell may include multiple bands and can be divided into multiple carriers.

[0141] The second information indicates that the terminal device carries the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier, and the terminal device can receive downlink data or transmit uplink data on the corresponding second carrier.

[0142] For example, the terminal device receiving the second information from the network device can be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0143] For example, the second information can be DCI. When the DCI is carried on the first carrier, the terminal device needs to receive the DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor the DCI can be reduced. Optionally, when the DCI is carried on the second carrier, the terminal device needs to receive the DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0144] Optionally, the technical solution in this application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0145] Referring to the seventh aspect, in some embodiments of the seventh aspect, the processing unit is used by the network device to determine channel information on a first carrier based on first information, and is used by the network device to determine channel information on a second carrier based on the channel information on the first carrier.

[0146] In this embodiment, the network device sequentially determines the channel information on the first carrier and the channel information on the second carrier, and then schedules the transmission resources on the first carrier and / or the transmission resources on the second carrier.

[0147] In connection with the seventh aspect, in some embodiments of the seventh aspect, the transceiver unit is further used by the network device to receive third information from the terminal device, the third information indicates first association information, the first association information indicates channel difference information between the first carrier and the second carrier, and the processing unit is used by the network device to determine channel information on the second carrier based on the first association information and the first information. In this embodiment, the network device further determines the channel information regarding the second carrier by using the first information (channel information regarding the first carrier) in combination with the third information (channel difference information between the first carrier and the second carrier), and as a result, the accuracy of the channel information regarding the second carrier can be guaranteed.

[0148] The first association information may include a path loss difference between the first carrier and the second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship, etc.

[0149] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0150] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0151] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U ) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0152] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0153] By way of example and not limitation, the network device can transmit fourth information to the terminal device.

[0154] Accordingly, the terminal device receives fourth indication information from the network device.

[0155] The fourth information is for scheduling transmission resources on both the first carrier and the second carrier.

[0156] For example, the fourth information indicates channel information regarding the first carrier and the second carrier. That is, the terminal device communicates resources on the first carrier and the second carrier based on the fourth information.

[0157] Optionally, the fourth information includes channel information on the first carrier. For example, after determining the channel information on the first carrier based on the first information, the network device refers to the first association information between a plurality of carriers to determine updated second association information, and transmits the second association information to the terminal device. Then, when transmitting the fourth information for scheduling transmission resources on the first carrier and the second carrier, the network device can transmit the channel information on the first carrier to the terminal device. The terminal device obtains the channel information on the second carrier from the second association information based on the channel information on the first carrier, and communicates resources on both the first carrier and the second carrier.

[0158] In this embodiment, various scheduling requirements for communication can be implemented, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission rate before the channel information on the second carrier is fed back can be improved, and as a result, the system transmission performance can be improved.

[0159] According to an eighth aspect, a wireless communication device is provided, the wireless communication device being a transceiver unit used by a network device to transmit channel information on a first carrier and second association information to a terminal device, the channel information on the first carrier including a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, the second association information indicating channel difference information between the first carrier and a second carrier, the channel information on the first carrier and the second association information being for determining channel information on the second carrier, the channel information on the second carrier including an MCS and / or spectral efficiency on the second carrier, the wireless communication device including the transceiver unit.

[0160] It should be noted that the channel information on the first carrier and the channel information on the second carrier are shared channel information. The shared channel information can be channel information at the granularity of a carrier and can be channel information shared by two carriers, including path loss, optimal beam direction, etc. Real-time channel information is current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0161] In this embodiment, a plurality of carriers (for example, a first carrier and a second carrier) may belong to a plurality of cells, that is, carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0162] The second information indicates that the terminal device carries the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier, and the terminal device can receive downlink data or transmit uplink data on the corresponding second carrier.

[0163] For example, the terminal device receiving the second information from the network device can be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0164] For example, the second information can be DCI. When DCI is carried on the first carrier, the terminal device needs to receive DCI on the first carrier. In this embodiment, the overhead of monitoring DCI by the terminal device can be reduced. Optionally, when DCI is carried on the second carrier, the terminal device needs to receive DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0165] Optionally, the technical solution in this application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and DCI is for scheduling transmission resources on the first carrier and the second carrier, and DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0166] Referring to the eighth aspect, in some embodiments of the eighth aspect, the transceiver unit is further used by the network device to transmit second information to the terminal device, and the second information is for scheduling transmission resources on a second carrier.

[0167] In connection with the eighth aspect, in some embodiments of the eighth aspect, the transceiver unit is further used by the network device to receive first information from the terminal device on a first carrier, and is used by the network device to determine channel information on the first carrier based on the first information.

[0168] In connection with the eighth aspect, in some embodiments of the eighth aspect, the transceiver unit is further used by the network device to receive third information from the terminal device, the third information indicates first association information, and the first association information indicates unupdated channel difference information between the first carrier and the second carrier. The processing unit is used by the network device to determine second association information based on the first association information.

[0169] In this embodiment, the second association information is updated based on the first association information. It can be understood that the second association information is determined by the network device based on the current system resource allocation situation and has better adaptability and flexibility.

[0170] The first association information may include a path loss difference, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship between the first carrier and the second carrier.

[0171] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0172] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is such that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0173] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCS V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U on the second carrier) based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0174] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control RRC signaling. This is not specifically limited in this application.

[0175] In relation to the seventh or eighth aspect, in some embodiments, at least one of the first association information or the second association information includes one or more of the following information, namely, propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectrum efficiency correspondence relationship.

[0176] Referring to the seventh or eighth aspect, in some embodiments, the value range of the real-time spectrum efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) satisfies, where Δ is the propagation path loss difference between the second carrier and the first carrier, and Z is the spectrum efficiency corresponding to the index U of the real-time MCS on the first carrier.

[0177] For example, the spectrum efficiency on the second carrier can alternatively be any value between 0.6W and 1.2W. Therefore, the value range of the index of the real-time MCS on the second carrier may be [V - 2, V + 1], where V corresponds to the real-time spectrum efficiency W.

[0178] Optionally, the value range of the spectrum efficiency on the second carrier is, for example, [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0179] It should be noted that the value range of the spectrum efficiency on the second carrier is only an example for illustration and should not constitute any limitation to the technical solution in this application.

[0180] In relation to the seventh or eighth aspect, in some embodiments, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10log 10 ((2 W - 1) / (2 Z - 1)) which is satisfied, where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier.

[0181] Regarding the seventh or eighth aspect, in some embodiments, the first information includes one or more of the following information, namely, the reference signal received power (RSRP) of the first carrier, the reference signal received quality (RSRQ) of the first carrier, the channel quality indicator (CQI) of the first carrier, the sounding reference signal (SRS) of the first carrier, the acknowledgment (ACK) or negative acknowledgment (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information of the first carrier.

[0182] By way of example and not limitation, the network device can transmit the fourth information to the terminal device.

[0183] Accordingly, the terminal device receives the fourth indication information from the network device.

[0184] The fourth information is for scheduling transmission resources on both the first carrier and the second carrier.

[0185] For example, the fourth information indicates channel information regarding the first carrier and the second carrier. That is, the terminal device communicates resources on the first carrier and the second carrier based on the fourth information.

[0186] Optionally, the fourth information includes channel information on the first carrier. For example, after determining the channel information on the first carrier based on the first information, the network device refers to the first association information between a plurality of carriers to determine updated second association information, and transmits the second association information to the terminal device. Next, when transmitting the fourth information for scheduling the transmission resources on the first carrier and the second carrier, the network device can transmit the channel information on the first carrier to the terminal device. The terminal device obtains the channel information on the second carrier from the second association information based on the channel information on the first carrier, and communicates resources on both the first carrier and the second carrier.

[0187] In this embodiment, various scheduling requirements for communication can be implemented, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission rate before the channel information is fed back on the second carrier can be improved, and as a result, the system transmission performance can be improved.

[0188] According to a ninth aspect, a terminal device is provided, and the terminal device includes a processor. Optionally, the terminal device further includes a memory. The processor is configured to control a transceiver to transmit and receive signals. The memory is configured to store a computer program. The processor is configured to call the computer program from the memory and execute the computer program to enable the terminal device to implement the method according to any one of the first aspect or the possible embodiments of the first aspect, or to enable the terminal device to implement the method according to any one of the second aspect or the possible embodiments of the second aspect.

[0189] Optionally, there is one or more processors and one or more memories.

[0190] Optionally, the memory may be integrated with the processor, or the memory and the processor may be separately arranged.

[0191] Optionally, the terminal device further includes a transceiver. Specifically, the transceiver may be a transmitter and a receiver.

[0192] According to a tenth aspect, a network device is provided. The network device includes a processor. Optionally, the network device further includes a memory. The processor is configured to control a transceiver to transmit and receive signals. The memory is configured to store a computer program. The processor is configured to call the computer program from the memory and execute the computer program to enable the network device to implement a method according to any one of the third aspect or possible embodiments of the third aspect, or to enable the network device to implement a method according to any one of the fourth aspect or possible embodiments of the fourth aspect.

[0193] Optionally, there is one or more processors and one or more memories.

[0194] Optionally, the memory may be integrated with the processor, or the memory and the processor may be separately arranged.

[0195] Optionally, the network device further includes a transceiver. Specifically, the transceiver may be a transmitter and a receiver.

[0196] According to the 11th aspect, a communication device is provided, which includes a module or unit configured to implement the method according to any one of the 1st aspect or the possible embodiments of the 1st aspect, a module or unit configured to implement the method according to any one of the 2nd aspect or the possible embodiments of the 2nd aspect, a module or unit configured to implement the method according to any one of the 3rd aspect or the possible embodiments of the 3rd aspect, or a module or unit configured to implement the method according to any one of the 4th aspect or the possible embodiments of the 4th aspect.

[0197] According to the 12th aspect, a communication system is provided, which includes a terminal device configured to implement the method according to any one of the 1st aspect or the possible embodiments of the 1st aspect, or configured to implement the method according to any one of the 2nd aspect or the possible embodiments of the 2nd aspect, and a network device configured to implement the method according to any one of the 3rd aspect or the possible embodiments of the 3rd aspect, or configured to implement the method according to any one of the 4th aspect or the possible embodiments of the 4th aspect.

[0198] According to the 13th aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program or code. When the computer program or code is executed on a computer, the computer is enabled to implement the method according to any one of the 1st aspect or the possible embodiments of the 1st aspect, the method according to any one of the 2nd aspect or the possible embodiments of the 2nd aspect, the method according to any one of the 3rd aspect or the possible embodiments of the 3rd aspect, and the method according to any one of the 4th aspect or the possible embodiments of the 4th aspect.

[0199] According to a 14th aspect, a chip is provided, the chip including at least one processor. The at least one processor is coupled to a memory. The memory is configured to store a computer program. The processor is configured to call the computer program from the memory and execute the computer program to enable a terminal device in which the chip system is installed to implement a method according to any one of the 1st aspect or possible embodiments of the 1st aspect, or to enable a terminal device in which the chip system is installed to implement a method according to any one of the 2nd aspect or possible embodiments of the 2nd aspect, or to enable a network device in which the chip system is installed to implement a method according to any one of the 3rd aspect or possible embodiments of the 3rd aspect, or to enable a network device in which the chip system is installed to implement a method according to any one of the 4th aspect or possible embodiments of the 4th aspect.

[0200] The chip may include an output circuit or interface configured to transmit information or data, and an input circuit or interface configured to receive information or data.

[0201] According to a 15th aspect, a computer program product is provided. The computer program product includes computer program code. When the computer program code is executed by a terminal device, the terminal device is enabled to implement a method according to any one of the 1st aspect or possible embodiments of the 1st aspect, or the terminal device is enabled to implement a method according to any one of the 2nd aspect or possible embodiments of the 2nd aspect. Additionally, when the computer program code is executed by a network device, the network device is enabled to implement a method according to any one of the 3rd aspect or possible embodiments of the 3rd aspect, or the network device is enabled to implement a method according to any one of the 4th aspect or possible embodiments of the 4th aspect.

[0202] According to the solution in the embodiment of the present application, a wireless communication method and a communication device are provided. The terminal device explicitly or implicitly transmits auxiliary information to the network device on a first carrier, and the network device is based on the obtained auxiliary information, or refers to the difference between the multi-carrier shared channel information or the multi-carrier history information, to estimate the channel information on a second carrier in order to schedule the terminal device to communicate resources on the second carrier. In this method, the MCS on another carrier where the channel information is not fed back is obtained based on the MCS on the carrier, the transmission efficiency before the channel related information is fed back on another carrier is improved, and the system transmission performance is improved.

Brief Description of the Drawings

[0203]

Figure 1

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Embodiments for Carrying Out the Invention

[0204] Hereinafter, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0205] The technical solutions in the embodiments of the present application may be applied to various communication systems, such as long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunication systems (UMTS), worldwide interoperability for microwave access (WIMAX) communication systems, future fifth-generation 5G systems, or new radio (NR) systems, or may be extended to similar wireless communication systems such as wireless-fidelity (WIFI) and cellular systems related to the 3rd generation partnership project (3GPP (registered trademark)).

[0206] Generally, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technologies, mobile communication systems support traditional communication and, for example, device to device (D2D) communication, machine to machine (M2M) communication, machine type communication (MTC), vehicle to everything (V2X) communication, for example, vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) communication, and vehicle to network (V2N) communication, long term evolution-vehicle (LTE-V), Internet of Things (IoT), industrial Internet, and long term evolution-machine (LTE-M).

[0207] It should be understood that the technical solutions in the embodiments of this application can be further applied to various communication systems based on non-orthogonal multiple access technology, for example, sparse code multiple access (SCMA) systems. Of course, SCMA may also have another name in the communication field. Furthermore, the technical solutions in the embodiments of this application can be applied to multi-carrier transmission systems using non-orthogonal multiple access technology, for example, orthogonal frequency division multiplexing (OFDM) systems using non-orthogonal multiple access technology, filter bank multi-carrier (FBMC) systems, generalized frequency division multiplexing (GFDM) systems, or filtered-OFDM (F-OFDM) systems.

[0208] To facilitate the understanding of the technical solution in this application, FIG. 1 is a schematic diagram of a communication system 100 used in one embodiment of this application. As shown in FIG. 1, the communication system may include at least one network device, for example, network device 101. The communication system may further include at least one terminal device, for example, terminal devices 102 to 107. The terminal devices 102 to 107 may be movable or fixed. The network device 101 can communicate with one or more of the terminal devices 102 to 107 via a wireless link. That is, the network device can send signals to the terminal device, and the terminal device can also send signals to the network device. For example, each network device may provide communication coverage in a specific geographical area and communicate with terminal devices located within the coverage area. For example, the network device may send configuration information to the terminal device, and the terminal device may send uplink data to the network device based on the configuration information. In another example, the network device may send downlink data to the terminal device. Therefore, the communication system consists of the network device 101 and the terminal devices 102 to 107 in FIG. 1.

[0209] Optionally, the terminal devices may alternatively communicate directly with each other. For example, the direct communication between terminal devices may be implemented using technologies such as D2D technology. As shown in FIG. 1, direct communication can be implemented using D2D technology between terminal device 105 and terminal device 106, and between terminal device 105 and terminal device 107. Terminal device 106 and terminal device 107 can communicate with terminal device 105 separately or simultaneously.

[0210] Alternatively, the terminal devices 105-107 may communicate with the network device 101 separately. In one aspect, direct communication with the network device 101 may be performed. For example, the terminal devices 105 and 106 in the figure may communicate directly with the network device 101. Also, indirect communication with the network device 101 may be performed. For example, the terminal device 107 in the figure communicates with the network device 101 via the terminal device 105.

[0211] It should be understood that FIG. 1 shows a communication link between one network device, a plurality of terminal devices, and a communication device. Optionally, the communication system 100 may include a plurality of network devices, and the coverage of each network device may include a different number of terminal devices, for example, more or fewer terminal devices. This is not specifically limited in this application.

[0212] A plurality of antennas may be configured for the aforementioned communication devices, for example, the network device 101 and the terminal devices 102-107 in FIG. 1. The plurality of antennas may include at least one transmission antenna for transmitting signals and at least one reception antenna for receiving signals. In addition, the communication device further includes a transmitter chain and a receiver chain. Those skilled in the art can understand that the transmitter chain and the receiver chain may each include a plurality of components related to signal transmission and reception (for example, a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or an antenna). Therefore, the network device and the terminal device can communicate with each other by using multi-antenna technology.

[0213] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity. This is not specifically limited in this application.

[0214] It should be further understood that FIG. 1 is only a simplified schematic diagram of an example for ease of understanding. The communication system 100 may further include another network device or another terminal device not shown in FIG. 1.

[0215] It should be noted that the embodiments of the present application use signal transmission as the background and are applicable to the same type of network scenario, heterogeneous network scenario, low-frequency scenario (sub 6G), high-frequency scenario (above 6G), terahertz, optical communication, frequency division duplex (FDD) system, time division duplex (TDD) system, and non-terrestrial networks (NTN), such as satellite communication. In addition, the transmission point is not limited in the present application, and coordinated multi-point transmission between macro base stations, between micro base stations, and between macro base stations and micro base stations can be implemented. In addition, the embodiments of the present application are applicable to communication between a base station and a terminal, communication between terminals, and communication between base stations, and are further applicable to a centralized unit (CU) or distributed unit (DU) architecture, a CP / UP split architecture, and the like.

[0216] Embodiments of the present application can be applied to the beam-based multi-carrier communication system shown in FIG. 1, for example, an NR system. The system includes uplink (from the terminal device to the network device) and downlink (from the access network device to the terminal device) communications in the communication system. According to the Long-Term Evolution LTE / NR protocol, uplink communication includes the transmission of uplink physical channels and uplink signals, and downlink communication includes the transmission of downlink physical channels and downlink signals. The uplink physical channels include a random access channel (PRACH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), etc. The uplink signals include a sounding reference signal (SRS), a PUCCH de-modulation reference signal (PUCCH-DMRS), a PUSCH de-modulation reference signal (PUSCH-DMRS), a phase noise tracking reference signal (PTRS), an uplink positioning signal, etc. The downlink physical channels include a physical broadcast channel (PBCH), a downlink control channel PDCCH, a downlink data channel PDSCH, etc.Downlink signals include the primary synchronization signal (PSS), secondary synchronization signal (SSS), PDCCH de-modulation reference signal (PDCCH-DMRS), PDSCH de-modulation reference signal (PDSCH-DMRS), phase tracking reference signal (PTRS), channel status information reference signal (CSI-RS), cell reference signal (CRS), time / frequency tracking reference signal (TRS), positioning reference signal (RS), etc. This is not specifically limited in this application.

[0217] It should be understood that the technical solutions provided in this application are mainly applicable to 5G NR multi-carrier systems and may also be further applicable to other or future communication systems, such as the 6th generation mobile communication system. This is not limited in this application.

[0218] In the embodiments of the present application, the terminal device may be referred to as a user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, user device, software terminal, etc., and includes various handheld devices, in-vehicle devices, wearable devices, or computing devices having a wireless communication function, or other processing devices connected to a wireless modem. The terminal may be a mobile station (MS), subscriber unit, cellular phone, smart phone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem, handset, laptop computer, machine type communication (MTC) terminal, etc.

[0219] The terminal device in the embodiments of this application may alternatively be a mobile phone, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handy terminal, a notebook computer, a cordless phone, a wireless local loop (WLL) station, a terminal device in a future 5G network, a terminal device in a future evolved public land mobile network (PLMN), etc.

[0220] In addition, the terminal device may alternatively be a terminal device in an internet of things (IoT) system. The IoT is an important component of future information technology development. The main technical feature of the IoT is to connect things to a network by using communication technology to implement a smart network for human-machine interconnection and thing-thing interconnection. It should be understood that the specific form of the terminal device is not limited in this application.

[0221] In addition, the terminal device may further include sensors such as an intelligent printer, a train detector, and a gas station. The main functions include collecting data (which is a function of some terminal devices), receiving control information and downlink data of the network device, emitting electromagnetic waves, and transmitting uplink data to the network device.

[0222] In an embodiment of the present application, the network device may be a device disposed in a wireless access network and providing a wireless communication function to the terminal device, and may be a device configured to communicate with the terminal device or a chip of the device. The network device includes, but is not limited to, a radio network controller (RNC), a base station controller (BSC), a home base station (for example, home evolved nodeB, or home node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity system, a wireless relay node, a wireless backhaul node, a transmission point (TP), a transmission and reception point (TRP), etc., and may be a gNB or a transmission point TRP or TP in a 5G NR system, or one or a group (including a plurality of antenna panels) of antenna panels of a base station in a 5G system, or the gNB or the transmission point may be, for example, a network node composed of a baseband unit BBU or a distributed unit (DU).

[0223] The network device in the embodiment of the present application may include various forms of macro base stations, micro base stations (also referred to as small cells), relay stations, access points, etc., and may be a base transceiver station (BTS) in a global system for mobile communications (GSM) system or a code division multiple access (CDMA) system, may be a Node B (NB) in a wideband code division multiple access (WCDMA) system, may be an evolved Node B (eNB or eNodeB) in an LTE system, or may be a radio controller in a cloud radio access network (CRAN) scenario. Alternatively, the network device may be a relay station, an access point, a wearable device, an in-vehicle device, a network device in a future 5G network, a network device in a future evolved public land mobile network (PLMN) network, etc.

[0224] In some network deployments, a network device may include a centralized unit (CU) and a distributed unit (DU). The network device may further include a radio unit (RU) and an active antenna unit (AAU). The CU implements some functions of the network device. For example, the CU is responsible for processing non-real-time protocols and services and implements the functions of the radio resource control (RRC) layer and the packet data convergence protocol (PDCP) layer. The DU implements some functions of the network device. For example, the DU plays a role in processing physical layer protocols and real-time services and implements the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing, and functions related to active antennas. Information in the RRC layer is ultimately changed from or to information in the PHY layer. Therefore, in this architecture, upper layer signaling (e.g., RRC layer signaling) may also be considered to be transmitted by the DU or by the DU and the AAU. It can be understood that the network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU may be classified as a network device within the radio access network (RAN), or the CU may be classified as a network device within the core network (CN). This is not limited in this specification.

[0225] The network device provides services to cells. The terminal device communicates with a cell by using the transmission resources (e.g., frequency domain resources or spectrum resources) allocated by the network device. The cell may belong to a macro base station (e.g., macro eNB or macro gNB), or may belong to a base station corresponding to a small cell. The small cells in this specification may include metro cells, micro cells, pico cells, femto cells, etc. These small cells are characterized by small coverage and low transmission power, and are applicable to the provision of high-speed data transmission services.

[0226] Alternatively, the network device may be a positioning service center, e.g., an evolved serving mobile location center (E-SMLC) or a location management function (LMF). The positioning service center is for the measurement information and location information of mobile phone network devices and terminal devices. The positioning service center is further responsible for performing location resolution on the measurement results of the terminal device to determine the location of the terminal device. The information exchange between the terminal device and the positioning service center can be implemented by using the LTE positioning protocol or the NR positioning protocol. The interaction between the network device and the positioning center is implemented by using the LTE positioning protocol A (LPPa) or the NR positioning protocol A (NRPPa).

[0227] In an embodiment of the present application, the network device and the terminal device each include a radio resource control (RRC) signaling exchange module, a media access control (MAC) signaling exchange module, and a physical (PHY) signaling exchange module. The RRC signaling exchange module can be a module used by the network device and the terminal device to transmit and receive RRC signaling. The MAC signaling exchange module can be a module used by the network device and the terminal device to transmit and receive media access control control element (MAC CE) signaling. The PHY layer signaling and data exchange module can be a module used by the network device and the terminal device to transmit and receive uplink control signaling or downlink control signaling, and uplink data or downlink data.

[0228] Currently, compared with the C-band, the low and mid-frequency FDD spectrum can provide better coverage. Therefore, with the demand for increasing network capacity, frequency division duplex (FDD) spectrum resources are widely used.

[0229] However, the FDD spectrum currently owned by operators is quite discrete. For example, through statistics, it is found that the available spectrum information of 63 operators in the range of 1.4 to 2.6 GHz is scattered. The bandwidth of 95% of single carriers is 30 MHz or less, and 93% of operators own at least two FDD carriers.

[0230] Although these FDD carriers are discrete, when these discrete spectra are combined, their aggregation bandwidth is very high. Through comparison between the aggregation bandwidth of FDD carriers and the bandwidth of C-band TDD carriers, it can be observed that the aggregated FDD carriers can provide a downlink bandwidth similar to that of the C-band TDD carriers' downlink bandwidth and an uplink bandwidth that is 2.4 times that of the C-band TDD carriers.

[0231] Therefore, in order to implement FDD carrier aggregation, support higher transmission bandwidth, increase the spectrum usage of user equipment UE, and improve the user experience, carrier aggregation CA technology is introduced.

[0232] It should be understood that carrier aggregation is to aggregate two or more component carriers (CCs) together to support higher transmission bandwidth. The carrier on which the terminal device performs random access is called the primary carrier component (PCC). The cell corresponding to the primary carrier component is the primary cell (PCell). The primary cell maintains the radio resource control RRC connection to the terminal device. The primary cell may include one downlink carrier and one uplink carrier. Carriers other than the primary carrier component are called secondary carrier components (SCCs). The cell corresponding to the secondary carrier component is the secondary cell (SCell), which is for providing additional radio resources. There is no RRC communication between the SCell and the terminal device. The secondary cell may include one downlink carrier. Note that the PCell is determined when the connection is established. The SCell is added, modified, or released by using the RRC connection reconfiguration message after the initial security activation procedure.

[0233] Actually, each component carrier corresponds to one independent cell. One component carrier can usually correspond to one cell. The aggregated cells are classified into PCell and SCell. The terminal device performs functions such as basic RRC communication and radio link management (RLM) in the PCell, and the SCell is mainly for increasing the transmission bandwidth of the terminal device.

[0234] In the embodiments of the present application, the meanings of carrier and component carrier can be understood as the same. The CA function can support the aggregation of continuous or discontinuous carriers. In order to efficiently use fragmented spectrum, carrier aggregation specifically supports the aggregation of component carriers with the same or different bandwidths, the aggregation of adjacent or non-adjacent component carriers in the same band, and the aggregation of component carriers in different bands, that is, the aggregation of different component carriers. In other words, the carrier aggregation scenario can be classified into three types, namely, in-band continuous carrier aggregation, in-band discontinuous carrier aggregation, and inter-band discontinuous carrier aggregation.

[0235] In addition, in the present application, a method in which one cell includes a plurality of uplink carriers and / or a plurality of downlink carriers can be further used to support a higher transmission bandwidth. In this case, the one-to-one correspondence between the cell and the carrier is lost. That is, one cell may include a plurality of bands or may be divided into a plurality of carriers. In other words, a plurality of carriers belong to the same cell. In the embodiments of the present application, one cell may include one carrier or may include a plurality of carriers. This is not specifically limited in the present application. The technical solution is described based on the carriers in the embodiments of the present application.

[0236] To save the energy of the terminal device, currently, after a plurality of SCell are configured for the terminal device, the SCell is not always in an activated state, but in a deactivated state. The terminal device activates the SCell only when there is big data to be communicated.

[0237] The common SCell activation process in multi-carrier aggregation may include the following: First, the network device sends a media access control control element (MAC-CE) for activating the SCell to the terminal device. Then, the terminal device sends a hybrid automatic repeat request (HARQ). In addition, the terminal device starts waiting for the first synchronization signal block (SSB) in the SCell to perform time-frequency synchronization. After time-frequency synchronization, the terminal device waits for the CSI-RS to perform channel measurement. Finally, the terminal device sends a channel state information reference signal report (CSI-RS report) to the network device. That is, the SCell activation procedure is completed. The delay of the SCell activation process usually requires at least 30 ms.

[0238] When the SCell activation step is simplified, the delay can be reduced to at least 10 ms. Compared with the above-mentioned common activation process, the main difference is that the terminal device does not need to wait for the SSB in the SCell to perform time-frequency synchronization, and the network device directly sends a temporary reference signal (temporary RS) to the terminal device for time-frequency synchronization.

[0239] In addition, in order to save the energy of the terminal device, on a single carrier in NR, the transmission bandwidth of the terminal device can change dynamically based on bandwidth part (BWP) switching.

[0240] For example, the network device configures two BWP configurations for the terminal device on a single carrier having a bandwidth of 100 MHz. The bandwidth of one BWP configuration is 100 MHz, and the bandwidth of the other BWP configuration is 20 MHz. When the data to be communicated is small, the terminal device may use the BWP configuration with a bandwidth of 20 MHz. When it is necessary to communicate big data, the network device sends downlink control information DCI to the terminal device, and the DCI indicates to the terminal device to perform a handover to use the BWP configuration with a bandwidth of 100 MHz. The delay of the handover process in this embodiment is about 1 - 2 ms.

[0241] It can be found that the delay of BWP switching on a single carrier in NR is smaller than the delay of SCell activation in multi - carrier CA. The reason is that the prerequisite for using the spectrum on a single carrier based on BWP is that different frequencies of the single carrier share the same time - frequency synchronization and channel information. Therefore, there is no need to perform synchronization and channel measurement again. On the contrary, due to the shared channel information difference between multiple carriers, it is necessary to perform time - frequency synchronization and channel information measurement again.

[0242] In conclusion, compared with the method in which a single carrier in NR uses spectrum based on BWP, the CA-based SCell activation and deactivation methods have longer delays, which causes lower multi-carrier spectrum utilization efficiency. In addition, for different carriers, time-frequency synchronization can be implemented through sharing and calibration of clock sources, but the shared channel information cannot be exactly the same due to the propagation path loss difference and antenna efficiency difference between different frequencies. Furthermore, the system transmission performance is affected.

[0243] In other words, when spectrum resources are used with low latency, there is currently no solution to the problem that shared channel information is different on multiple carriers. Therefore, how to efficiently use spectrum with low latency and improve system transmission performance is an urgent problem to be solved.

[0244] In view of this, the present application provides a wireless communication method and apparatus. The terminal device explicitly or implicitly transmits auxiliary information to the network device on a first carrier. The network device estimates the channel information on a second carrier based on the auxiliary information on the first carrier. Alternatively, the network device transmits updated second association information to the terminal device based on the auxiliary information on the first carrier and the first association information between a plurality of carriers reported by the terminal device, and the terminal device determines the channel information on the second carrier. According to this method, the spectrum utilization efficiency can be improved, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission speed before the channel information is fed back on the second carrier can be improved, and as a result, the system transmission performance can be improved.

[0245] To facilitate the understanding of the embodiments of the present application, the following points are described.

[0246] In the embodiments of the present application, unless otherwise specified or there is no logical contradiction, the terms and / or descriptions between different embodiments are consistent and may be cross-referenced to each other. The technical features in different embodiments may be combined based on their internal logical relationships to form new embodiments.

[0247] In the present application, "at least one" refers to one or more, and "a plurality" refers to two or more. And / or describes the association relationship between related objects and indicates that three relationships may exist. For example, A and / or B can represent the following cases, that is, the case where only A exists, the case where both A and B exist, and the case where only B exists. A and B can be singular or plural. In the description of the present application, the character " / " usually indicates an "or" relationship between related objects. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of singular items or plural items. For example, at least one of a, b, and c can indicate a, b, c, a and b, a and c, b and c, or a, b, and c. Each of a, b, and c can be singular or plural.

[0248] In the embodiments of the present application, "first", "second", and various numbers are merely for distinction to facilitate the description and are not for limiting the scope of the embodiments of the present application. For example, they are for distinguishing different indication information.

[0249] In the embodiments of the present application, the definitions in the protocol can be implemented by pre-storing the corresponding code or the corresponding table in a device (e.g., a terminal device or a network device), or in another manner capable of indicating related information. The specific embodiments thereof are not limited in the present application. The "protocol" in the embodiments of the present application can be a standard protocol in the communication field, and can include, for example, the LTE protocol, the NR protocol, and related protocols applicable to future communication systems. This is not limited in the present application.

[0250] In the embodiments of the present application, descriptions such as "when" and "in a case" all mean that a device (e.g., a terminal device or a network device) performs corresponding processing in an objective situation, and do not limit time. The device (e.g., a terminal device or a network device) does not need to execute a decision action during implementation and does not mean any other limitation.

[0251] In the embodiments of the present application, "indicating" can include "directly indicating" and "indirectly indicating". When an indication information is described as indicating A, the indication information may directly indicate A or indirectly indicate A, but it does not necessarily mean that the indication information carries A.

[0252] The indication method in the embodiments of the present application should be understood to cover various methods that can enable the party to be indicated to know the information to be indicated. The information to be indicated may be transmitted as a whole, or may be divided into a plurality of sub-informations for separate transmission. In addition, the transmission period and / or transmission opportunity of the sub-information may be the same or different. The specific transmission method is not limited in the present application. The transmission period and / or transmission opportunity of the sub-information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting device by transmitting configuration information to the receiving-end device. The configuration information may be, for example, but not limited to, one or at least two combinations of radio resource control signaling, media access control MAC layer signaling, and physical PHY layer signaling. The radio resource control signaling includes RRC signaling, the MAC layer signaling includes MAC CE, and the physical PHY layer signaling includes downlink control information DCI, etc.

[0253] In the embodiments of the present application, "wireless communication" may be abbreviated as "communication" for short. Communication may be further described as "data transmission", "information transmission", "data processing", etc. Transmission includes "transmission" and "reception". This is not specifically limited in the present application.

[0254] To better understand the technical solutions, some terms in the present application will be briefly described below.

[0255] 1. A carrier refers to a segment of adjacent spectrum and can be an uplink carrier, a downlink carrier, or a flexible carrier. A flexible carrier is both an uplink carrier and a downlink carrier. The UE can communicate uplink information on the uplink carrier and downlink information on the downlink carrier.

[0256] 2. A band refers to a segment of a continuous spectrum and can be divided into multiple carriers.

[0257] 3. A cell refers to a logical entity. Each cell has a cell ID. Broadcast information configured for a cell is usually carried on a downlink carrier within the cell. A cell may include a downlink carrier and / or an uplink carrier. A UE can access a cell, communicate uplink information on an uplink carrier in the cell, and / or communicate downlink information on a downlink carrier in the cell.

[0258] 4. Shared channel information is channel information that can be shared by two carriers, such as path loss and optimal beam direction. In an embodiment of the present application, the shared channel information is channel information that can be shared and is at the granularity of a carrier.

[0259] 5. Real-time channel information is current and instantaneous channel information. Channel information may change rapidly over time, such as CQI, MCS, spectral efficiency, and optimal beam direction. CQI is an index number of channel information fed back by a UE to a base station, and MCS is an index number of coding and modulation information used when the base station schedules the UE to communicate PDSCH or PUSCH. There is a correspondence relationship between the index number in the CQI / MCS table and the spectral efficiency.

[0260] 6. Historical channel information is previously recorded channel information and includes MCS and spectral efficiency.

[0261] 7. Propagation path loss difference is the path loss difference between different bands. Path loss refers to the decrease in power density that occurs when an electromagnetic wave propagates through space. Path loss can be caused by many factors, such as free space loss, as well as losses and absorptions due to refraction, diffraction, and reflection.

[0262] 8. The antenna efficiency difference is the difference in antenna efficiency between different bands. Antenna efficiency is the ratio of the radiated power of the antenna to the input power of the antenna, and includes transmission efficiency and reception efficiency. Transmission efficiency is the electrical efficiency of converting the radio frequency power received by the antenna into radiated power by the antenna. Reception efficiency is the radio wave power blocked by the antenna.

[0263] 9. The optimal beam difference is the difference in the optimal beam between different bands. A beam is a specific combination of dipole elements in an antenna array and is for implementing the transmission or reception of a directional signal. The optimal beam indicates the beam that maximizes the transmission or reception energy. Since the behavior of electromagnetic waves propagating in space, such as refraction, diffraction, and reflection, is related to the band, the optimal beams in different bands can be different.

[0264] Figure 2 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. Specific embodiment steps include the following steps.

[0265] S210: The terminal device transmits first information to the network device on a first carrier.

[0266] Therefore, the network device receives the first information from the terminal device.

[0267] The first information is for determining channel information on the first carrier, and the channel information on the first carrier includes the modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier.

[0268] Note that the channel information regarding the first carrier is the shared channel information regarding the first carrier. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. The real-time channel information is the current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0269] In this embodiment, a plurality of carriers (for example, the first carrier and the second carrier) may belong to a plurality of cells, that is, carrier aggregation cells. For example, one cell may correspond to one uplink carrier and one downlink carrier, or one cell may correspond to one flexible carrier. Optionally, a plurality of carriers may alternatively belong to the same cell. That is, one cell may include a plurality of bands and can be divided into a plurality of carriers.

[0270] For example, the first information includes one or more of the following information, that is, the reference signal received power (RSRP) on the first carrier, the reference signal received quality (RSRQ) on the first carrier, the channel quality indicator (CQI) on the first carrier, the sounding reference signal (SRS) on the first carrier, the acknowledgement (ACK) or negative acknowledgement (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information on the first carrier.

[0271] In a possible embodiment, the terminal device sends third information to the network device, where the third information indicates first association information, and the first association information indicates channel difference information between a first carrier and a second carrier. In this case, the channel information on the second carrier is determined based on the first association information and the first information. In this embodiment, the network device further determines the channel information regarding the second carrier by using the first information (channel information regarding the first carrier) in combination with the third information (channel difference information between the first carrier and the second carrier), and as a result, the accuracy of the channel information regarding the second carrier can be guaranteed.

[0272] The first association information may include a path loss difference between the first carrier and the second carrier, a past MCS correspondence relationship, and / or a past spectral efficiency correspondence relationship, etc.

[0273] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0274] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is such that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0275] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U ) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0276] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0277] In the foregoing possible embodiments, at least one of the first association information and the second association information may include one or more of the following information, that is, propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectrum efficiency correspondence relationship.

[0278] S220: The network device transmits the second information to the terminal device.

[0279] Therefore, the terminal device receives the second information from the network device.

[0280] The second information is for scheduling transmission resources on the second carrier. The second information includes indication information of channel information on the second carrier. The channel information on the second carrier includes the MCS and / or spectrum efficiency on the second carrier. The channel information on the second carrier is determined based on the channel information on the first carrier.

[0281] Note that the channel information regarding the second carrier is the shared channel information regarding the second carrier. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. The real-time channel information is the current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0282] In this embodiment, the second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0283] For example, the terminal device receiving the second information from the network device can be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in this application.

[0284] For example, the second information can be DCI. When DCI is carried on the first carrier, the terminal device needs to receive DCI on the first carrier. In this embodiment, the overhead of monitoring DCI by the terminal device can be reduced. Optionally, when DCI is carried on the second carrier, the terminal device needs to receive DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0285] Optionally, the technical solution in the present application is also applicable to scheduling both Carrier 1 and Carrier 2. That is, the UE communicates resources on both Carrier 1 and Carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0286] In a possible embodiment, before the network device sends the second information to the terminal device, the network device needs to determine the channel information on the second carrier based on the channel information on the first carrier. For example, the network device determines the channel information on the first carrier based on the first information. The network device determines the channel information on the second carrier based on the channel information on the first carrier.

[0287] The channel information on the second carrier includes the MCS and / or spectral efficiency on the second carrier.

[0288] For example, when the MCS index on the first carrier is U, the value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) satisfies, where Δ is the propagation path loss difference between the second carrier and the first carrier, Z is the spectral efficiency corresponding to the MCS index U on the first carrier, and the value range of the MCS index on the second carrier is [V - 2, V + 1], where V corresponds to the spectral efficiency W.

[0289] For example, the spectral efficiency on the second carrier can alternatively be any value within 0.6W to 1.2W.

[0290] Optionally, the value range of the spectral efficiency on the second carrier is, for example, [0.8W, 1.1W], [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0291] It should be noted that the value range of the spectral efficiency on the second carrier is only an example for explanation and should not constitute any limitation to the technical solution in this application.

[0292] For example, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10log 10 ((2 W - 1) / (2 Z - 1)) is satisfied.

[0293] In another possible embodiment, the network device can send the fourth information to the terminal device.

[0294] Therefore, the terminal device receives the fourth instruction information from the network device.

[0295] The fourth information is for scheduling the transmission resources on both carrier 1 and carrier 2.

[0296] For example, the fourth information indicates the channel information regarding the first carrier and the second carrier. That is, the terminal device communicates with the resources on the first carrier and the second carrier based on the fourth information.

[0297] Optionally, the fourth information includes channel information on the first carrier. For example, after determining the channel information on the first carrier based on the first information, the network device refers to the first association information between multiple carriers to determine updated second association information, and sends the second association information to the terminal device. Then, when sending the fourth information for scheduling the transmission resources on the first carrier and the second carrier, the network device can send the channel information on the first carrier to the terminal device. The terminal device obtains the channel information on the second carrier from the second association information based on the channel information on the first carrier, and communicates resources on both the first carrier and the second carrier.

[0298] In this embodiment, various scheduling requirements for communication can be implemented, the channel information on the second carrier can be obtained based on the channel information on the first carrier, the transmission rate before the channel information is fed back on the second carrier can be improved, and as a result, the system transmission performance can be improved.

[0299] In conclusion, the network device obtains the MCS and / or spectral efficiency on another carrier (for example, the second carrier) on which the channel information is not fed back based on the MCS and / or spectral efficiency on the first carrier. As a result, the MCS on another carrier on which the channel information is not fed back is obtained based on the MCS on the carrier, the transmission efficiency before the channel-related information is fed back on another carrier is improved, and the system transmission performance is improved.

[0300] Figure 3 is a schematic flowchart of a wireless communication method 300 according to an embodiment of the present application. The differences between method 300 and method 200 are as follows: In this embodiment, the network device updates the association information between a plurality of carriers reported by the terminal device, and transmits the updated association information between the plurality of carriers to the terminal device. The terminal device determines the channel information on the second carrier based on the updated association information in combination with the channel information on the first carrier in order to schedule the transmission resources on the second carrier. Specific embodiment steps include the following steps.

[0301] S310: The network device transmits the channel information on the first carrier and the second association information to the terminal device.

[0302] Therefore, the terminal device receives the channel information on the first carrier and the second association information from the network device.

[0303] In this embodiment of the present application, the network device and the terminal device each include a radio resource control (RRC) signaling exchange module, a media access control (MAC) signaling exchange module, and a physical (PHY) signaling exchange module. The RRC signaling exchange module can be a module used by the network device and the terminal device to transmit and receive RRC signaling. The MAC signaling exchange module can be a module used by the network device and the terminal device to transmit and receive media access control control element (MAC CE) signaling. The PHY layer signaling and data exchange module can be a module used by the network device and the terminal device to transmit and receive uplink control signaling or downlink control signaling, as well as uplink and downlink data or downlink data.

[0304] For example, the channel information on the first carrier and the second association information can be carried by using RRC signaling. This is not specifically limited in this application.

[0305] Optionally, the network device determines the channel information on the first carrier and the second association information.

[0306] The channel information on the first carrier includes the modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, and the second association information indicates the channel difference information between the first carrier and the second carrier.

[0307] It should be noted that the channel information regarding the first carrier is the shared channel information regarding the first carrier. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. The real-time channel information is the current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectral efficiency, and optimal beam direction.

[0308] In this embodiment, multiple carriers (for example, the first carrier and the second carrier) may belong to multiple cells, that is, carrier aggregation cells. For example, one cell corresponds to one uplink carrier and one downlink carrier, or one cell corresponds to one flexible carrier. Optionally, multiple carriers may alternatively belong to the same cell. That is, one cell includes multiple bands and can be divided into multiple carriers.

[0309] In a possible embodiment, the terminal device transmits the first information to the network device on the first carrier.

[0310] Therefore, the network device receives the first information from the terminal device.

[0311] The first information is for determining channel information on a first carrier.

[0312] For example, the first information includes one or more of the following information, namely, the reference signal received power (RSRP) on the first carrier, the reference signal received quality (RSRQ) on the first carrier, the channel quality indicator (CQI) on the first carrier, the sounding reference signal (SRS) on the first carrier, the acknowledgement (ACK) or negative acknowledgement (NACK) information of the communication device on the first carrier, and the information indicating whether the communication device has successfully demodulated the information on the first carrier.

[0313] In another possible embodiment, the terminal device transmits third information to the network device.

[0314] Therefore, the network device receives the third information from the terminal device.

[0315] The third information indicates first association information, and the first association information is for determining second association information. The first association information indicates the unupdated channel difference information between the first carrier and the second carrier.

[0316] In this embodiment, the second association information is updated based on the first association information. It can be understood that the second association information is determined by the network device based on the current system resource allocation situation and has better compatibility and flexibility.

[0317] For example, when the RSRP on the first carrier is X dBm and the RSRP on the second carrier is Y dBm, the path loss difference between the carriers is Δ = Y - X. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0318] For example, the historical MCS correspondence relationship between the first carrier and the second carrier is that when the MCS used on the first carrier is U1, the MCS used on the second carrier is V1, or when the MCS used on the first carrier is U2, the MCS used on the second carrier is V2. In this case, referring to the case where the channel information on the first carrier is MCS V and / or spectral efficiency V, it can also be determined that the channel information on the second carrier includes MCS W and / or spectral efficiency W.

[0319] For example, the path loss difference in the first association relationship is ΔdB. Referring to the case where each MCS on the first carrier is U, the network device further learns that the MCS on the second carrier is close to V, for example, from V - 2 to V + 1. As a result, the MCS correspondence relationship between the first carrier and the second carrier can be determined. The expression form of the MCS correspondence relationship may be presented by using a table. For example, all MCSs 0 to 27 on the first carrier correspond to MCSs V0 to V 27 on the second carrier. The terminal device can determine the channel information (for example, the MCS is V U ) on the second carrier based on the received channel information (for example, the MCS is U) on the first carrier and the MCS correspondence relationship.

[0320] It should be noted that the MCS correspondence relationship in this embodiment can be carried by using radio resource control (RRC) signaling. This is not specifically limited in this application.

[0321] In the foregoing possible embodiments, at least one of the first association information or the second association information includes one or more of the following information, namely, propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectrum efficiency correspondence relationship.

[0322] For example, the propagation path loss difference Δ between the first carrier and the second carrier is Δ = 10log 10 ((2 W - 1) / (2 Z - 1)) where W is the spectrum efficiency corresponding to the MCS index V on the second carrier, and Z is the spectrum efficiency corresponding to the MCS index U on the first carrier.

[0323] S320: The terminal device determines the channel information on the second carrier based on the channel information on the first carrier and the second association information.

[0324] The channel information on the second carrier includes the MCS and / or spectrum efficiency on the second carrier.

[0325] It should be noted that the channel information regarding the second carrier is the shared channel information regarding the second carrier. The shared channel information can be channel information at the carrier granularity, can be channel information shared by two carriers, and includes path loss, optimal beam direction, etc. The real-time channel information is the current and instantaneous channel information. The channel information may change rapidly over time, for example, CQI, MCS, spectrum efficiency, and optimal beam direction.

[0326] For example, the value range of the spectrum efficiency on the second carrier is [0.8W, 1.1W], where W is W = log2(1 + 10 Δ / 10 (2 Z - 1)) is satisfied, where Δ is the propagation path loss difference between the second carrier and the first carrier, Z is the spectral efficiency corresponding to the MCS index U on the first carrier, the value range of the MCS index on the second carrier is [V - 2, V + 1], and V corresponds to the spectral efficiency W.

[0327] For example, the spectral efficiency on the second carrier can alternatively be any value between 0.6W and 1.2W.

[0328] Optionally, the value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], [0.7W, 1.2W], [0.6W, 1.0W], etc.

[0329] It should be noted that the value range of the spectral efficiency on the second carrier is only an example for explanation and should not constitute any limitation to the technical solution in this application.

[0330] In a possible embodiment, the network device transmits the second information to the terminal device.

[0331] Therefore, the terminal device receives the second information from the network device and communicates with the network device by using the transmission resources on the second carrier based on the second information and the channel information on the second carrier.

[0332] The second information is for scheduling the transmission resources on the second carrier.

[0333] In this embodiment, the second information indicates that the terminal device can carry the downlink data channel PDSCH or the uplink data channel PUSCH on the second carrier and can receive downlink data or transmit uplink data on the corresponding second carrier.

[0334] For example, the terminal device receiving the second information from the network device may be the terminal device receiving the second information on the first carrier, the terminal device receiving the second information on the second carrier, or the terminal device receiving the second information on another carrier. This is not specifically limited in the present application.

[0335] For example, the second information may be DCI. When the DCI is carried on the first carrier, the terminal device needs to receive the DCI on the first carrier. In this embodiment, the overhead for the terminal device to monitor the DCI can be reduced. Optionally, when the DCI is carried on the second carrier, the terminal device needs to receive the DCI on the second carrier, and as a result, the resource occupancy of the first carrier can be reduced.

[0336] Optionally, the technical solution in the present application is also applicable to scheduling both carrier 1 and carrier 2. That is, the UE communicates resources on both carrier 1 and carrier 2. For example, the terminal device receives downlink control information DCI from the network device on the first carrier, and the DCI is for scheduling transmission resources on the first carrier and the second carrier, and the DCI indicates channel information on the first carrier and the second carrier. In this embodiment, cross-carrier scheduling may be performed on the transmission resources on the second carrier based on the channel information on the first carrier.

[0337] In a possible embodiment, the network device can send the fourth information to the terminal device.

[0338] Therefore, the terminal device receives the fourth instruction information from the network device.

[0339] The fourth information is for scheduling transmission resources on both carrier 1 and carrier 2.

[0340] For example, the fourth information includes channel information on the first carrier and channel information on the second carrier.

[0341] Optionally, the fourth information includes channel information on the first carrier.

[0342] In conclusion, the network device updates the association relationship between the first carrier and the second carrier, and sends the updated association relationship to the terminal device. As a result, the terminal device can further determine the channel information on the second carrier based on the channel information on the first carrier and the updated association relationship between the carriers in order to schedule the transmission resources on the second carrier. The MCS on another carrier for which channel information is not fed back is obtained based on the MCS on the carrier, the transmission efficiency before the channel related information is fed back on another carrier is improved, and the system transmission performance is improved.

[0343] To facilitate the understanding of the embodiments of the present application, hereinafter, a base station and a UE are used as examples for explaining the technical solutions provided in the present application.

[0344] FIG. 4 is a schematic flowchart of a wireless communication method 400 according to an embodiment of the present application. In this embodiment, the base station explicitly or implicitly obtains the shared channel information difference between a plurality of carriers, and estimates the modulation and coding scheme (MCS) on the carrier for which channel information is not fed back based on the auxiliary information on the carrier for which channel information is fed back, and performs resource scheduling. The specific implementation steps include the following steps.

[0345] S410: The UE sends auxiliary information #1 to the base station.

[0346] Therefore, the base station receives the auxiliary information #1 from the UE.

[0347] The auxiliary information #1 explicitly or implicitly indicates the shared channel information difference between a plurality of carriers (for example, carrier 1 and carrier 2).

[0348] In this embodiment of the present application, the shared channel information difference between a plurality of carriers may include the propagation path loss difference and the antenna efficiency difference between different frequencies.

[0349] The following provides some implementations of the explicit or implicit indication of the auxiliary information #1, specifically including the following:

[0350] Method 1 (explicit): The auxiliary information #1 is the shared channel information difference between a plurality of carriers of the UE. Specifically, the UE transmits the shared channel information difference between a plurality of carriers to the base station. Two carriers of the UE are used as an example. Carrier 1 is used as a reference (for example, 0 dB), and it is assumed that the difference between carrier 2 and carrier 1 is ΔdB. In this case, the auxiliary information #1 is ΔdB, and the base station may directly determine based on the auxiliary information #1 that the shared channel information difference between carrier 1 and carrier 2 is ΔdB.

[0351] Method 2 (implicit): This embodiment is for obtaining the shared channel information difference in the downlink. That is, the base station transmits a request message to the UE, and the CSI-RS report that is on a plurality of carriers and fed back by the UE to the base station includes the reference signal received power (RSRP) or the reference signal received quality (RSRQ) of the CSI-RS. The unit of RSRP is dBm, and the unit of RSRQ is dB.

[0352] Two carriers of the UE are used as an example. The auxiliary information #1 indicates that the RSRP of carrier 1 is X dBm and the RSRP of carrier 2 is Y dBm. In this case, the base station may indirectly determine based on the auxiliary information #1 that the shared channel information difference between carrier 1 and carrier 2 is Δ = Y - X.

[0353] Method 3 (Implicit): This embodiment is for obtaining the shared channel information difference in the downlink. That is, the base station transmits a request message to the UE. The CSI-RS report that is on multiple carriers and fed back by the UE to the base station includes the channel quality indication (CQI) of the CSI-RS. Two carriers of the UE are used as an example. The auxiliary information #1 indicates that the CQI of carrier 1 is a and the CQI of carrier 2 is b. In this case, the base station may separately determine according to the standard protocol that the spectral efficiency corresponding to carrier 1 is α and the spectral efficiency corresponding to carrier 2 is β. Further, in this embodiment, the shared channel information difference between carrier 1 and carrier 2 is Δ = 10log 10 ((2 β -1) / (2 α -1)).

[0354] Method 4 (Implicit): This embodiment may be for obtaining the shared channel information difference in the uplink or downlink. The UE separately transmits sounding reference signals (SRS) to the base station on multiple carriers. Two carriers of the UE are used as an example. The auxiliary information #1 indicates that the RSRP of the SRS on carrier 1 is x dBm and the RSRP of the SRS on carrier 2 is y dBm. In this case, the base station further performs measurements based on the auxiliary information #1 and may indirectly determine that the shared channel information difference between carrier 1 and carrier 2 in the uplink or downlink is Δ = y - x by using the correlation).

[0355] It should be noted that the foregoing possible embodiments are only examples for explanation and should not constitute any limitation to the technical solutions in this application.

[0356] S420: The UE performs transmission on carrier 1 and transmits the auxiliary information #2 related to carrier 1 to the base station.

[0357] Therefore, the base station receives the auxiliary information #2 from the UE.

[0358] The auxiliary information #2 is for CSI-RS, and may include one or more of the RSRP or RSRQ of CSI-RS included in the CSI-RS report for carrier 1, the CQI of CSI-RS included in the CSI-RS report for carrier 1, the sounding reference signal (SRS) for carrier 1, the feedback positive acknowledgment (ACK) or negative acknowledgment (NACK) information, and the information indicating whether the uplink data of the UE is successfully demodulated.

[0359] S430: The base station determines the real-time (current) MCS on carrier 1 based on the auxiliary information #2.

[0360] Some embodiments for determining the real-time (current) MCS on carrier 1 based on the auxiliary information #2 fed back by the UE in step S420 are provided, including the following:

[0361] Method 1: This method is for obtaining the downlink MCS on carrier 1. The base station determines the real-time (current) MCS on carrier 1 based on the RSRP or RSRQ of CSI-RS included in the CSI-RS report on carrier 1 and fed back by the UE.

[0362] Method 2: This method is for obtaining the downlink MCS on carrier 1. The CSI-RS report on carrier 1 and fed back by the UE includes the CQI of CSI-RS, and the real-time (current) MCS on carrier 1 is determined.

[0363] Method 3: This method may be for obtaining the uplink or downlink MCS on carrier 1. The base station obtains the uplink or downlink (using the correlation) channel information on carrier 1 through the measurement based on the SRS transmitted by the UE on carrier 1, and thereby determines the real-time (current) MCS on carrier 1.

[0364] Method 4: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the ACK or NACK information fed back by the UE.

[0365] Method 5: This method is for obtaining the uplink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 according to whether the uplink data of the UE is successfully demodulated.

[0366] S440: The base station determines the real-time MCS on Carrier 2 and the real-time spectral efficiency on Carrier 2 based on the MCS on Carrier 1 and the shared channel information difference between multiple carriers.

[0367] It should be noted that in this embodiment, when the UE does not feedback the auxiliary information regarding Carrier 2 (for example, that of CSI-RS, including RSRP, RSRQ, or CQI included in the CSI-RS report regarding Carrier 2, and SRS transmitted on Carrier 2), the UE performs transmission on Carrier 1 and transmits the auxiliary information regarding Carrier 1. As a result, the MCS most suitable for Carrier 2 is further estimated, and the real-time spectral efficiency on Carrier 2 is calculated.

[0368] For example, assuming that when the real-time MCS index determined based on step S430 on Carrier 1 is U and the base station determines that the spectral efficiency corresponding to the real-time MCS U on Carrier 1 is Z according to the standard protocol, the base station can calculate the real-time spectral efficiency on Carrier 2 based on the real-time MCS on Carrier 1, and the spectral efficiency is W = log2(1 + 10 Δ / 10 (2 Z-1)). Therefore, the base station can determine, according to the standard protocol, that the real-time MCS corresponding to the real-time spectral efficiency W on Carrier 2 is V and is on Carrier 2.

[0369] Optionally, the real-time MCS on Carrier 2 is close to V, for example, from V-2 to V+1.

[0370] Optionally, the spectral efficiency corresponding to the real-time MCS V on Carrier 2 is close to W, for example, 0.8W~1.1W.

[0371] S450: The base station transmits DCI#1 to the UE.

[0372] Therefore, the UE receives DCI#1 from the base station.

[0373] DCI#1 indicates handover and the spectrum used (Carrier 1 + Carrier 2). That is, the UE can perform transmission on both Carrier 1 and Carrier 2.

[0374] It should be noted that step S420 indicates that the UE performs transmission on Carrier 1, and the base station can determine the real-time MCS and spectral efficiency on Carrier 2 after steps S430 and S440 are performed. Step S450 indicates that the UE can perform transmission on both Carrier 1 and Carrier 2. That is, DCI#1 indicates that the UE can be handed over from Carrier 1 to Carrier 1 + Carrier 2.

[0375] It should be understood that in this embodiment, normal communication can be performed without feedback of the channel information on Carrier 2, the transmission efficiency on Carrier 2 can be improved, the delay of the transmission performed by using Carrier 2 can be reduced, and the ratio of high-bandwidth transmission can be increased.

[0376] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE may perform transmission only on carrier 2.

[0377] Specific embodiments where DCI #1 indicates the handover and the spectrum (carrier 1 + carrier 2) to be used may include the following:

[0378] For example, DCI #1 includes a field indicating the index of the carrier, and the field indicates to the UE to activate the carrier. That is, the UE can perform transmission on the carrier. For example, the index of carrier 2 is 2, the value of the field in DCI #1 is 2, indicating that the UE can perform transmission on carrier 2. Since the UE has performed transmission on carrier 1, the UE can, in this case, perform transmission on both carrier 1 and carrier 2.

[0379] For example, DCI #1 includes a field indicating the index of the carrier, and the field indicates that the UE activates the carrier and is handed over to the carrier. The UE can perform transmission on the carrier, but cannot perform transmission on the original activated carrier. For example, the index of carrier 2 is 2, the value of the field in DCI #1 is 2, indicating that the UE can perform transmission only on carrier 2 and cannot perform transmission on carrier 1.

[0380] For example, DCI#1 includes a field indicating a bitmap on the activated carrier. Each carrier corresponds to a single bit of 0 or 1 in the bitmap, and the bit indicates whether the corresponding carrier is activated. For example, carrier 1 corresponds to the first bit, and carrier 2 corresponds to the second bit. The value of the field in DCI#1 is 11..., indicating that the UE can perform transmission on both carrier 1 and carrier 2. Alternatively, the value of the field in DCI#1 is 01..., indicating that the UE can perform transmission only on carrier 2 and cannot perform transmission on carrier 1.

[0381] For example, DCI#1 includes a field indicating the index of the BWP on the carrier, and this field indicates activating the BWP on the carrier. The UE can perform transmission in the BWP on the carrier. For example, the BWPs on all carriers are uniformly numbered, the index of the BWP on carrier 2 is 2, the value of the field in DCI#1 is 2, indicating that the UE can perform transmission in the BWP on carrier 2. In another example, the index of the BWP consists of two parts, the index of the carrier and the index of the BWP on the carrier. The index of carrier 2 is 2, the index of the BWP is 1, the value of the field in DCI#1 is [2,1], indicating that the UE can perform transmission in the BWP on carrier 2. Since the UE has performed transmission on carrier 1, the UE can, in this case, perform transmission on both carrier 1 and carrier 2.

[0382] For example, DCI#1 includes a field indicating the index of the BWP on the carrier, and the field indicates switching the active BWP to the BWP. That is, the UE can perform transmission in the BWP on the carrier, but cannot perform transmission in the original active BWP. For example, the BWPs on all carriers are uniformly numbered, the index of the BWP on carrier 2 is 2, the value of the field in DCI#1 is 2, indicating that the UE can perform transmission only in the BWP on carrier 2 and cannot perform transmission on carrier 1. In another example, the index of the BWP consists of two parts, the index of the carrier and the index of the BWP on the carrier. The index of carrier 2 is 2, the index of the BWP is 1, the value of the field in DCI#1 is [2,1], indicating that the UE can perform transmission only within the BWP on carrier 2 and cannot perform transmission on carrier 1.

[0383] For example, DCI#1 includes a field indicating a bitmap for the activated carriers. Each BWP on each carrier corresponds to a single bit of 0 or 1 in the bitmap, and the bit indicates whether the corresponding BWP on the corresponding carrier is activated. For example, BWP a on carrier 1 corresponds to the first bit, BWP b on carrier 1 corresponds to the second bit, BWP c on carrier 2 corresponds to the third bit, BWP d on carrier 2 corresponds to the fourth bit, and BWP e on carrier 3 may further correspond to the fifth bit. This is not limited in this specification. The value of the field in DCI#1 is 1010..., indicating that the UE can perform transmission on both BWP a on carrier 1 and BWP c on carrier 2. Alternatively, the value of the field in DCI#1 is 0010..., indicating that the UE can perform transmission only on BWP c on carrier 2 and cannot perform transmission on carrier 1. The above are merely examples for illustration and should not constitute any limitation to the technical solution in this application.

[0384] For example, DCI#1 includes a field indicating active BWP information on each carrier, and the active BWP information is sequentially arranged. When a BWP is activated on a carrier, the active BWP information on the carrier is the sequence number of the BWP on the carrier, and only one BWP is activated simultaneously on one carrier. When the BWP is not activated on the carrier, the active BWP information on the carrier is a preset value. For example, there are BWP a and BWP b on carrier 1, and the sequence numbers of BWP a and BWP b on the carrier are 1 and 2, there are BWP c and BWP d on carrier 2, and the sequence numbers of BWP c and BWP d on the carrier are 1 and 2. The value of the field in DCI#1 is 11..., indicating that the UE can perform transmission on both BWP a on carrier 1 and BWP c on carrier 2. Alternatively, the value of the field in DCI#1 is 21..., indicating that the UE can perform transmission on both BWP b on carrier 1 and BWP c on carrier 2. Alternatively, the value of the field in DCI#1 is 01..., indicating that the UE can only perform transmission on BWP c on carrier 2 and cannot perform transmission on carrier 1. Alternatively, the value of the field in DCI#1 is 02..., indicating that the UE can only perform transmission on BWP d on carrier 2 and cannot perform transmission on carrier 1. The above is only an example for explanation and should not constitute any limitation to the technical solution in this application.

[0385] It should be understood that DCI#1 may also be used to deactivate a carrier or a BWP. For the sake of brevity, the details will not be described again in this specification.

[0386] S460: The base station transmits DCI#2 to the UE.

[0387] Therefore, the terminal receives DCI#2 from the base station.

[0388] DCI #2 schedules the UE to perform transmissions on both Carrier 1 and Carrier 2 to implement carrier aggregation, thereby improving transmission efficiency. That is, the UE can perform transmissions on both Carrier 1 and Carrier 2.

[0389] In addition, DCI #2 includes real-time MCS and / or real-time spectral efficiency on Carrier 1 and Carrier 2.

[0390] In this embodiment, it should be understood that scheduling a carrier for transmission means that the PDSCH or PUSCH is carried on the carrier and the UE receives downlink data or transmits uplink data on the corresponding carrier.

[0391] In one embodiment, when the base station indicates to the UE to use the MCS with index U on Carrier 1, the real-time MCS with index V obtained in step S440 is used on Carrier 2.

[0392] In another embodiment, the base station indicates to the UE to use the same MCS on both Carrier 1 and Carrier 2. For example, the index of the same MCS ranges from index U (real-time MCS on Carrier 1) to index V (real-time MCS obtained in step S540).

[0393] In this embodiment, it should be noted that when the UE does not feedback auxiliary information related to Carrier 2 (for example, that of CSI-RS, including RSRP, RSRQ, or CQI included in the CSI-RS report for Carrier 2, and SRS transmitted on Carrier 2), the base station indicates to the UE to schedule spectral resources on both Carrier 1 and Carrier 2.

[0394] For example, DCI#1 in step S450 and DCI#2 in step S460 may be used as a whole, that is, transmitted and received by using the same DCI. That is, the DCI indicates the handover and the spectrum to be used, and further indicates that the UE is scheduled to perform transmission on both carrier 1 and carrier 2, and is for that purpose.

[0395] Optionally, DCI#1 may not be transmitted. That is, the base station only needs to transmit DCI#2 to the UE. DCI#2 indicates that the UE needs to perform transmission on both carrier 1 and carrier 2. This embodiment implies that the UE can perform transmission on carrier 2. Therefore, DCI#1 may alternatively not be transmitted. This is not specifically limited in this application.

[0396] By way of example and not limitation, the real-time MCS (index is V) on carrier 2 and the spectral efficiency W = log2(1 + 10 Δ / 10 (2 Z -1)) determined by the base station in step S440 may be transmitted to the UE before step S460. In this case, in step S460, DCI#2 transmitted by the base station may only include the real-time (current) MCS on carrier 1 and / or the real-time spectral efficiency on carrier 1. In other words, if the base station transmits the real-time MCS on multiple carriers to the UE before indicating to the UE to schedule the spectral resources, DCI#2 may only include the real-time (current) MCS on carrier 1 during the final resource scheduling. Conversely, the real-time (current) MCS on the scheduled carrier needs to be transmitted to the UE together during the final resource scheduling. In the two embodiments, the transmission delay on carrier 2 can be reduced and the spectral utilization efficiency can be improved. This is not specifically limited in this application.

[0397] As a conclusion, the base station can obtain the MCS on another carrier (for example, Carrier 2) where channel information is not fed back, based on the MCS on one of the carriers (for example, Carrier 1), by obtaining the shared channel information difference of UEs on different carriers (for example, the path loss difference between Carrier 1 and Carrier 2). According to this method, the delay of the transmission implemented by using another carrier can be shortened, the ratio of high-bandwidth transmission can be increased, the transmission efficiency before the channel-related information is fed back on another carrier can be improved, and the system transmission performance can be improved. In addition, since the shared channel information on different frequencies is not completely the same, the problem that the channel information on another carrier where the channel information is not fed back is unknown is solved.

[0398] FIG. 5 is a schematic flowchart of a wireless communication method 500 according to an embodiment of the present application. The difference between method 500 and method 400 is as follows: In this embodiment, the base station transmits the MCS correspondence relationship between a plurality of carriers, which is determined based on the shared channel information difference between the plurality of carriers, to the UE. As a result, the signaling overhead during subsequent resource scheduling can be reduced. The specific embodiment steps include the following steps.

[0399] S510: The UE transmits auxiliary information #A to the base station.

[0400] Therefore, the base station receives the auxiliary information #A from the UE.

[0401] The auxiliary information #A explicitly or implicitly indicates the shared channel information difference between a plurality of carriers (for example, Carrier 1 and Carrier 2).

[0402] In this embodiment of the present application, the shared channel information difference between a plurality of carriers may include the propagation path loss difference and the antenna efficiency difference between different frequencies.

[0403] The following provides some embodiments of the explicit or implicit indication of the auxiliary information #A, specifically including the following:

[0404] Method 1 (Explicit): The auxiliary information #A is the shared channel information difference between multiple carriers of the UE. Specifically, the UE transmits the shared channel information difference between multiple carriers to the base station. Two carriers of the UE are used as an example. Carrier 1 is used as a reference (e.g., 0 dB), and it is assumed that the difference between Carrier 2 and Carrier 1 is ΔdB. In this case, the auxiliary information #A is ΔdB, and the base station may directly determine based on the auxiliary information #A that the shared channel information difference between Carrier 1 and Carrier 2 is ΔdB.

[0405] Method 2 (Implicit): This embodiment is for obtaining the shared channel information difference in the downlink. That is, the base station transmits a request message to the UE, and the CSI-RS report that is on multiple carriers and fed back by the UE to the base station includes the RSRP or RSRQ of the CSI-RS. Two carriers of the UE are used as an example. The auxiliary information #A indicates that the RSRP on Carrier 1 is X dBm and the RSRP on Carrier 2 is Y dBm. In this case, the base station may indirectly determine based on the auxiliary information #A that the shared channel information difference between Carrier 1 and Carrier 2 is Δ = Y - X.

[0406] Method 3 (Implicit): This embodiment is for obtaining the shared channel information difference in the downlink. That is, the base station transmits a request message to the UE. The CSI-RS report, which is on multiple carriers and fed back by the UE to the base station, includes the channel quality indication (CQI) of the CSI-RS. Two carriers of the UE are used as an example. The auxiliary information #A indicates that the CQI of carrier 1 is a and the CQI of carrier 2 is b. In this case, the base station may separately determine according to the standard protocol that the spectral efficiency corresponding to carrier 1 is α and the spectral efficiency corresponding to carrier 2 is β. Further, in this embodiment, the shared channel information difference between carrier 1 and carrier 2 is Δ = 10log 10 ((2 β -1) / (2 α -1)).

[0407] Method 4 (Implicit): This embodiment may be for obtaining the shared channel information difference in the uplink or downlink. The UE separately transmits sounding reference signals (SRS) to the base station on multiple carriers. Two carriers of the UE are used as an example. The auxiliary information #A indicates that the RSRP of the SRS on carrier 1 is x dBm and the RSRP of the SRS on carrier 2 is y dBm. In this case, the base station further performs measurements based on the auxiliary information #A and may indirectly determine that the shared channel information difference between carrier 1 and carrier 2 in the uplink or downlink is Δ = y - x using the correlation.

[0408] It should be noted that the foregoing possible embodiments are only examples for explanation and should not constitute any limitation to the technical solutions in this application.

[0409] S520: The base station determines the MCS correspondence relationship between multiple carriers (for example, carrier 1 and carrier 2) based on the shared channel information difference between the multiple carriers (for example, carrier 1 and carrier 2).

[0410] For example, when the index of the real-time MCS on carrier 1 is U, the base station determines that the real-time MCS on carrier 2 is close to V, for example, between V - 2 and V + 1, or the base station determines that the spectral efficiency corresponding to the real-time MCS V on carrier 2 is close to W, for example, between 0.8W and 1.1W.

[0411] First, the shared channel information difference obtained by the base station in step S510 is ΔdB. That is, the difference between carrier 2 and carrier 1 is ΔdB. Next, the base station may determine, according to the standard protocol, that the spectral efficiency corresponding to the real-time MCS U on carrier 1 is Z. In this case, the base station determines that the real-time spectral efficiency W on carrier 2 satisfies W = log2(1 + 10 Δ / 10 (2 Z - 1)). In addition, according to the standard protocol, it can be determined that the real-time spectral efficiency W on carrier 2 corresponds to the real-time MCS V.

[0412] In this embodiment, the MCS is the index number of the coding and modulation information used when the base station schedules the UE to communicate PDSCH or PUSCH. The MCS correspondence relationship may be carried by using RRC signaling, and the expression form of the MCS correspondence relationship may be a table. For example, there is a one-to-one correspondence between all MCSs 0 to 27 on carrier 1 and MCSs V0 to V 27 on carrier 2.

[0413] That is, MCSMapping::=SEQUENCE(SIZE(27))OF INTEGER(0..27).

[0414] S530: The base station transmits the MCS correspondence relationship between a plurality of carriers (for example, carrier 1 and carrier 2) to the UE.

[0415] Therefore, the UE receives from the base station the MCS correspondence relationship between a plurality of carriers (for example, Carrier 1 and Carrier 2).

[0416] S540: The UE performs transmission on Carrier 1 and transmits auxiliary information #B related to Carrier 1 to the base station.

[0417] Therefore, the base station receives auxiliary information #B from the UE.

[0418] The auxiliary information #B is of CSI-RS and may include one or more of the RSRP or RSRQ of CSI-RS included in the CSI-RS report related to Carrier 1, the CQI of CSI-RS included in the CSI-RS report related to Carrier 1, the sounding reference signal (SRS) related to Carrier 1, the feedback positive acknowledgment (ACK) or negative acknowledgment (NACK) information, and the information indicating whether the uplink data of the UE is successfully demodulated.

[0419] S550: The base station determines the real-time (current) MCS on Carrier 1 based on the auxiliary information #B.

[0420] Based on the auxiliary information #B fed back by the UE in step S540, some embodiments for determining the real-time (current) MCS on Carrier 1 are provided, including the following:

[0421] Method 1: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the RSRP or RSRQ of CSI-RS included in the CSI-RS report on Carrier 1 and fed back by the UE.

[0422] Method 2: This method is for obtaining the downlink MCS on Carrier 1. The CSI-RS report that is on Carrier 1 and feedback by the UE includes the CQI of the CSI-RS, and the real-time (current) MCS on Carrier 1 is determined.

[0423] Method 3: This method can be for obtaining the uplink or downlink MCS on Carrier 1. The base station obtains the uplink or downlink (using the correlation) channel information on Carrier 1 through measurements based on the SRS transmitted by the UE on Carrier 1, thereby determining the real-time (current) MCS on Carrier 1.

[0424] Method 4: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the ACK or NACK information feedback by the UE.

[0425] Method 5: This method is for obtaining the uplink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 according to whether the uplink data of the UE is successfully demodulated.

[0426] S560: The base station transmits DCI#A to the UE.

[0427] Therefore, the UE receives DCI#A from the base station.

[0428] DCI#A indicates the handover and the spectrum used (Carrier 1 + Carrier 2). That is, the UE can perform transmission on both Carrier 1 and Carrier 2.

[0429] In this embodiment, normal communication can be carried out without feedback of channel information on carrier 2, the transmission efficiency on carrier 2 can be improved, the delay of the transmission carried out by using carrier 2 can be reduced, and it should be understood that the ratio of high-bandwidth transmission can be increased.

[0430] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE may perform transmission only on carrier 2.

[0431] For a specific embodiment in which DCI#A indicates the spectrum (carrier 1 + carrier 2) for handover and use, refer to step S450. For the sake of brevity, the details will not be described again in this specification.

[0432] S570: The base station transmits DCI#B to the UE.

[0433] Therefore, the UE receives DCI#B from the base station.

[0434] DCI#B is for instructing and scheduling the UE to perform transmission on both carrier 1 and carrier 2 in order to implement carrier aggregation, thereby improving the transmission efficiency. That is, the UE can perform transmission on both carrier 1 and carrier 2.

[0435] In addition, DCI#B may include the real-time MCS on carrier 1 (i.e., the MCS index is U) and / or the real-time spectral efficiency Z on carrier 1. In step S530, the UE has obtained the real-time MCS correspondence between carrier 1 and carrier 2. Therefore, in step S570, the DCI#B transmitted by the base station may include the real-time MCS U on carrier 1. Therefore, after receiving DCI#B, the UE may determine that the real-time MCS on carrier 2 is V and the corresponding spectral efficiency is W. That is, V U can be obtained through a table lookup. In this case, the UE can perform resource scheduling on carriers 1 and 2.

[0436] In this embodiment, the signaling overhead, that is, the MCS in DCI#B, can be reduced.

[0437] For example, when the base station indicates to the UE to use the real-time MCS with index U on carrier 1 based on the MCS correspondence obtained in step S530, the index of the real-time MCS used by the UE on carrier 2 is V.

[0438] By way of example and not limitation, DCI#A in step S560 and DCI#B in step S570 may be used as a whole, that is, transmitted and received by using the same DCI. That is, the DCI indicates the handover and the spectrum to be used, and further indicates to schedule the UE to perform transmission on both carriers 1 and 2, and is for this purpose.

[0439] Optionally, DCI#A may not be transmitted. That is, the base station only needs to transmit DCI#B to the UE. DCI#B indicates that the UE needs to perform transmission on both carrier 1 and carrier 2. This embodiment implies that the UE can perform transmission on carrier 2. Therefore, DCI#A may alternatively not be transmitted. This is not specifically limited in this application.

[0440] Note that step S530 may not be performed. That is, the base station does not transmit the real-time MCS correspondence relationship and / or the real-time spectrum efficiency correspondence relationship between carrier 1 and carrier 2 to the UE. In this case, in step S570, DCI#B transmitted by the base station needs to include the real-time (current) MCS and / or spectrum efficiency on both carrier 1 and carrier 2. This method is merely an example for explanation and should not constitute any limitation to the technical solution in this application.

[0441] In conclusion, the base station can obtain the MCS on another carrier (for example, carrier 2) where channel information is not fed back based on the MCS on one of the carriers (for example, carrier 1) by obtaining the shared channel information difference of the UE on different carriers (for example, the path loss difference between carrier 1 and carrier 2). According to this method, the delay of transmission implemented by using another carrier can be shortened, the ratio of high-bandwidth transmission can be increased, the transmission efficiency before the channel-related information is fed back on another carrier can be improved, and the system transmission performance can be improved. In addition, the signaling overhead is reduced, and since the shared channel information on different frequencies is not exactly the same, the problem that the channel information on another carrier where the channel information is not fed back is unknown is solved.

[0442] FIG. 6 is a schematic flowchart of a wireless communication method 600 according to an embodiment of the present application. The difference between method 600 and method 400 is as follows: In this embodiment, the base station obtains the past MCS correspondence relationship between a plurality of carriers, and based on the auxiliary information on the carrier where the channel information is fed back, estimates the MCS on the carrier where the channel information is not fed back, and performs resource scheduling. The specific implementation steps include the following steps.

[0443] S610: The UE performs transmission on a plurality of carriers (for example, carrier 1 and carrier 2), and transmits auxiliary information #a related to carrier 1 and carrier 2 to the base station. Accordingly, the base station receives the auxiliary information #a from the UE.

[0444] The auxiliary information #a is of CSI-RS and may include one or more of RSRP or RSRQ included in the CSI-RS report related to carrier 1 and carrier 2, CQI included in the CSI-RS report related to carrier 1 and carrier 2, sounding reference signal (SRS) related to carrier 1 and carrier 2, fed-back positive acknowledgment (ACK) or negative acknowledgment (NACK) information, and information indicating whether the uplink data of the UE is successfully demodulated.

[0445] Optionally, the auxiliary information #a may be the shared channel information difference (for example, path loss difference or antenna efficiency difference) between carrier 1 and carrier 2.

[0446] S620: The base station determines the past real-time-MCS correspondence relationship between carrier 1 and carrier 2 based on the auxiliary information #a.

[0447] For example, when the index corresponding to the real-time MCS used on carrier 1 is U1, it is determined that the index corresponding to the real-time MCS used on carrier 2 is V1. When the real-time MCS used on carrier 1 corresponds to U2, the MCS used on carrier 2 is V2.

[0448] S630: The UE performs transmission on carrier 1 and transmits auxiliary information #b related to carrier 1 to the base station.

[0449] Therefore, the base station receives auxiliary information #b from the UE.

[0450] The auxiliary information #b is of CSI-RS and may include one or more of the RSRP or RSRQ of CSI-RS included in the CSI-RS report related to carrier 1, the CQI included in the CSI-RS report related to carrier 1, the sounding reference signal (SRS) related to carrier 1, the feedback positive acknowledgment (ACK) or negative acknowledgment (NACK) information, and the information indicating whether the uplink data of the UE is successfully demodulated.

[0451] S640: The base station determines the real-time (current) MCS on carrier 1 based on the auxiliary information #b.

[0452] Based on the auxiliary information #b fed back by the UE in step S630, some embodiments for determining the real-time (current) MCS on carrier 1 are provided, including the following:

[0453] Method 1: This method is for obtaining the downlink MCS on carrier 1. The base station determines the real-time (current) MCS on carrier 1 based on the RSRP or RSRQ of CSI-RS included in the CSI-RS report on carrier 1 and fed back by the UE.

[0454] Method 2: This method is for obtaining the downlink MCS on Carrier 1. The CSI-RS report that is on Carrier 1 and feedback by the UE includes the CQI of the CSI-RS, and the real-time (current) MCS on Carrier 1 is determined.

[0455] Method 3: This method can be for obtaining the uplink or downlink MCS on Carrier 1. The base station obtains the uplink or downlink (using the correlation) channel information on Carrier 1 through the measurement based on the SRS transmitted by the UE on Carrier 1, thereby determining the real-time (current) MCS on Carrier 1.

[0456] Method 4: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the ACK or NACK information feedback by the UE.

[0457] Method 5: This method is for obtaining the uplink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 according to whether the uplink data of the UE is successfully demodulated.

[0458] S650: The base station transmits DCI#a to the UE.

[0459] Therefore, the UE receives DCI#a from the base station.

[0460] DCI#a indicates the handover and the spectrum used (Carrier 1 + Carrier 2). That is, the UE can perform transmission on both Carrier 1 and Carrier 2.

[0461] In this embodiment, normal communication can be carried out without feedback of channel information on carrier 2, the transmission efficiency on carrier 2 can be improved, the delay of the transmission carried out by using carrier 2 can be reduced, and it should be understood that the ratio of high-bandwidth transmission can be increased.

[0462] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE may perform transmission only on carrier 2.

[0463] For a specific embodiment in which DCI#a indicates the spectrum (carrier 1 + carrier 2) for handover and use, refer to step S450. For the sake of brevity, the details will not be described again in this specification.

[0464] S660: The base station transmits DCI#b to the UE.

[0465] Therefore, the UE receives DCI#b from the base station.

[0466] DCI#b is for instructing and scheduling the UE to perform transmission on both carrier 1 and carrier 2 in order to implement carrier aggregation, thereby improving the transmission efficiency. That is, the UE can perform transmission on both carrier 1 and carrier 2.

[0467] In addition, DCI#2 includes the real-time MCS and / or real-time spectral efficiency on carrier 1 and carrier 2.

[0468] For example, assuming that the real-time MCS used on carrier 1 is U3, the index corresponding to the real-time MCS used on carrier 2 is V3. When U3 < U1, V3 < V1, and when U1 < U3 < U2, V1 < V3 < V2.

[0469] In this embodiment, it should be noted that when the UE does not feedback the auxiliary information related to carrier 2 (for example, that of CSI-RS, including RSRP, RSRQ, or CQI included in the CSI-RS report for carrier 2, and SRS transmitted on carrier 2), the base station indicates to the UE to schedule spectrum resources on both carrier 1 and carrier 2.

[0470] For example, DCI#a in step S650 and DCI#b in step S660 may be used as a whole, that is, transmitted and received by using the same DCI. That is, the DCI indicates the handover and the spectrum to be used, and further indicates scheduling the UE to perform transmission on both carrier 1 and carrier 2, and is for this purpose.

[0471] Optionally, DCI#a may not be transmitted. That is, the base station only needs to transmit DCI#b to the UE. DCI#b indicates that the UE needs to perform transmission on both carrier 1 and carrier 2. This embodiment implies that the UE can perform transmission on carrier 2. Therefore, DCI#a may alternatively not be transmitted. This is not specifically limited in this application.

[0472] By way of example rather than limitation, the real-time MCS correspondence relationship between carrier 1 and carrier 2 determined by the base station in step S620 may be transmitted to the UE before step S660. In this case, in step S660, DCI#b transmitted by the base station may include only the real-time (current) MCS on carrier 1 and / or the real-time spectral efficiency on carrier 1. In other words, if the base station transmits the real-time MCS on a plurality of carriers to the UE before indicating to the UE to schedule spectral resources, DCI#b may include only the real-time (current) MCS on carrier 1 during the final resource scheduling. Conversely, the real-time (current) MCS on the scheduled carrier needs to be transmitted to the UE together during the final resource scheduling. In the two embodiments, the transmission delay on carrier 2 can be reduced and the spectral usage efficiency can be improved. This is not specifically limited in the present application.

[0473] In conclusion, the base station can obtain the MCS on another carrier (for example, carrier 2) for which channel information is not fed back based on the MCS on one of the carriers (for example, carrier 1) by obtaining the shared channel information difference of the UE on different carriers (for example, the path loss difference between carrier 1 and carrier 2). According to this method, the delay of the transmission implemented by using another carrier can be shortened, the ratio of high-bandwidth transmission can be increased, the transmission efficiency before the channel-related information is fed back on another carrier can be improved, and the system transmission performance can be improved. In addition, since the shared channel information on different frequencies is not completely the same, the problem that the channel information on another carrier for which the channel information is not fed back is unknown is solved.

[0474] FIG. 7 is a schematic flowchart of a wireless communication method 700 according to an embodiment of the present application. The differences between method 700 and method 400 are as follows: In this embodiment, the base station directly estimates the MCS on the carrier on which the channel information is not fed back based on the MCS on the carrier on which the channel information is fed back, and performs resource scheduling. Specific embodiment steps include the following steps.

[0475] S710: The UE performs transmission on carrier 1 and transmits auxiliary information related to carrier 1 to the base station.

[0476] Therefore, the base station receives the auxiliary information from the UE.

[0477] The auxiliary information may be of CSI-RS and include one or more of RSRP or RSRQ included in the CSI-RS report related to carrier 1, CQI included in the CSI-RS report related to carrier 1, sounding reference signal (SRS) related to carrier 1, feedback positive acknowledgment (ACK) or negative acknowledgment (NACK) information, and information indicating whether the uplink data of the UE is successfully demodulated.

[0478] [[ID=1?]] S720: The base station determines the real-time (current) MCS on carrier 1 based on the auxiliary information.

[0479] For example, it is assumed that the index corresponding to the real-time (current) MCS on carrier 1 determined by the base station is U.

[0480] Based on the auxiliary information fed back by the UE in step S710, the following partial embodiments for determining the real-time (current) MCS on carrier 1 are provided, including the following:

[0481] Method 1: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the RSRP or RSRQ of the CSI-RS included in the CSI-RS report on Carrier 1 and fed back by the UE.

[0482] Method 2: This method is for obtaining the downlink MCS on Carrier 1. The CSI-RS report on Carrier 1 and fed back by the UE includes the CQI of the CSI-RS, and the real-time (current) MCS on Carrier 1 is determined.

[0483] Method 3: This method can be for obtaining the uplink or downlink MCS on Carrier 1. The base station obtains the uplink or downlink (using the correlation) channel information on Carrier 1 through the measurements based on the SRS transmitted by the UE on Carrier 1, and thereby determines the real-time (current) MCS on Carrier 1.

[0484] Method 4: This method is for obtaining the downlink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 based on the ACK or NACK information fed back by the UE.

[0485] Method 5: This method is for obtaining the uplink MCS on Carrier 1. The base station determines the real-time (current) MCS on Carrier 1 according to whether the uplink data of the UE is demodulated normally.

[0486] S730: The base station estimates the real-time (current) MCS on Carrier 2 based on the real-time (current) MCS on Carrier 1.

[0487] For example, when the index corresponding to the real-time MCS used on carrier 1 is U, the base station estimates that the index V corresponding to the real-time MCS used on carrier 2 is close to U, for example, from U - 2 to U + 2. That is, V ∈ (U - 2, U + 2).

[0488] Optionally, when the spectral efficiency Z on carrier 1 is lower than the spectral efficiency W on carrier 2, the base station estimates that the index V corresponding to the real-time (current) MCS used on carrier 2 is from U - 2 to U.

[0489] Optionally, when the spectral efficiency Z on carrier 1 is higher than the spectral efficiency W on carrier 2, the base station estimates that the index V corresponding to the real-time (current) MCS used on carrier 2 is from U to U + 2.

[0490] Note that in this embodiment, the index U of the real-time MCS on carrier 1 corresponds to the spectral efficiency Z, and the index V of the real-time MCS on carrier 2 corresponds to the spectral efficiency W.

[0491] S740: The base station transmits DCI#α to the UE.

[0492] Therefore, the UE receives DCI#α from the base station.

[0493] DCI#α indicates handover and the spectrum used (carrier 1 + carrier 2). That is, the UE can perform transmission on both carrier 1 and carrier 2.

[0494] It should be understood that in this embodiment, normal communication can be carried out without feedback of channel information on carrier 2, the transmission efficiency on carrier 2 can be improved, the delay of the transmission carried out by using carrier 2 can be reduced, and the ratio of high-bandwidth transmission can be increased.

[0495] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE may perform transmission only on carrier 2.

[0496] For a specific embodiment where DCI #α indicates the spectrum (carrier 1 + carrier 2) for handover and use, refer to step S450. For the sake of brevity, the details are not described again herein.

[0497] S750: The base station transmits DCI #β to the UE.

[0498] Accordingly, the UE receives DCI #β from the base station.

[0499] DCI #β is for indicating that the UE is scheduled to perform transmission on both carrier 1 and carrier 2 in order to implement carrier aggregation, thereby improving the transmission efficiency. That is, the UE can perform transmission on both carrier 1 and carrier 2.

[0500] In a possible embodiment, DCI #β includes the real-time MCS and / or real-time spectral efficiency on carrier 1 and carrier 2. For details, refer to the real-time MCS used on carrier 1 and carrier 2 and provided in step S730. The details are not described again herein.

[0501] It should be understood that this method is implemented when the UE does not feedback the channel information on carrier 2 to the base station and the UE does not know the real-time (current) MCS on carrier 2 in advance.

[0502] In another possible embodiment, DCI #β may include the real-time MCS and / or the real-time spectral efficiency on carrier 1. In this case, the base station needs to send the real-time MCS correspondence relationship between carrier 1 and carrier 2 to the UE before step S750.

[0503] For example, when the index corresponding to the real-time MCS in DCI #β that is on carrier 1 and received by the UE is U, the index V corresponding to the real-time MCS for scheduling the resources on carrier 2 is close to U, for example, from U - 2 to U + 2. If the spectral efficiency Z in DCI #β that is on carrier 1 and received by the UE is lower than the spectral efficiency W in DCI #β that is on carrier 2 and received by the UE, the base station estimates that the index V corresponding to the real-time (current) MCS used on carrier 2 is from U to U + 2. If the spectral efficiency Z in DCI #β that is on carrier 1 and received by the UE is lower than the spectral efficiency W in DCI #β that is on carrier 2 and received by the UE, the base station estimates that the index V corresponding to the real-time (current) MCS used on carrier 2 is from U to U + 2. The foregoing embodiments are merely examples for illustration and should not constitute any limitation to the technical solutions in this application.

[0504] By way of non-limiting example, DCI #α in step S740 and DCI #β in step S750 may be used as a whole, that is, transmitted and received by using the same DCI. That is, the DCI indicates the handover and the spectrum to be used, and further indicates that the UE is scheduled to perform transmission on both carrier 1 and carrier 2, and is for this purpose.

[0505] Optionally, DCI#α may not be transmitted. That is, the base station only needs to transmit DCI#β to the UE. DCI#β indicates that the UE needs to perform transmission on both carrier 1 and carrier 2. This embodiment implies that the UE can perform transmission on carrier 2. Therefore, DCI#α may alternatively not be transmitted. This is not specifically limited in this application.

[0506] In conclusion, the base station can obtain the MCS on another carrier (e.g., carrier 2) where channel information is not fed back based on the MCS on one of the carriers (e.g., carrier 1) by obtaining the shared channel information difference of the UE on different carriers (e.g., the path loss difference between carrier 1 and carrier 2). According to this method, the delay of the transmission implemented by using another carrier can be shortened, the ratio of high-bandwidth transmission can be increased, the transmission efficiency before the channel-related information is fed back on another carrier can be improved, and the system transmission performance can be improved. In addition, since the shared channel information on different frequencies is not completely the same, the problem that the channel information on another carrier where the channel information is not fed back is unknown is solved.

[0507] FIG. 8 is a schematic flowchart of a wireless communication method 800 according to an embodiment of the present application. The difference between method 800 and method 400 is as follows: In this embodiment, the base station explicitly or implicitly obtains the optimal beam difference between multiple carriers, and estimates the optimal beam on the carrier where the channel information is not fed back based on the optimal beam information on the carrier where the channel information is fed back, and performs resource scheduling. The specific implementation steps include the following steps.

[0508] S810: The UE transmits the auxiliary information #a to the base station. Therefore, the base station receives the auxiliary information #a from the UE.

[0509] The auxiliary information #a explicitly or implicitly indicates the optimal beam difference between a plurality of carriers (for example, carrier 1 and carrier 2).

[0510] The following provides some embodiments of the explicit or implicit indication of the auxiliary information #a, which specifically includes the following:

[0511] Method 1: The auxiliary information #a is the optimal beam correspondence relationship between different carriers of the UE, and the base station explicitly obtains the optimal beam correspondence relationship.

[0512] Method 2: The auxiliary information #a is the optimal beams separately used by the UE on carrier 1 and carrier 2, and the base station implicitly obtains the optimal beam correspondence relationship.

[0513] For example, the optimal beam correspondence relationship may include the following:

[0514] (1) Carrier 1 and carrier 2 share the same optimal beam.

[0515] (2) When the optimal beam A1 is used on carrier 1, the optimal beams B1, B2, and B3 are used on carrier 2. When the optimal beam A2 is used on carrier 1, the optimal beams B4, B5, and B6 are used on carrier 2.

[0516] In other words, the optimal beam used on carrier 2 may be the same as the optimal beam used on carrier 1, or the optimal beam used on carrier 2 may be different from the optimal beam used on carrier 1, and the number of optimal beams on carrier 2 is 1 or more. This is not specifically limited in this application.

[0517] It should be noted that the above-provided embodiments are only examples for explanation and should not constitute any limitation to the technical solutions in this application.

[0518] S820: The UE performs transmission on carrier 1 and transmits auxiliary information #b related to carrier 1 to the base station.

[0519] Therefore, the base station receives auxiliary information #b from the UE.

[0520] The auxiliary information #b may include the RSRP or RSRQ of the CSI-RS included in the CSI-RS report regarding a plurality of beams on carrier 1, the CQI of the CSI-RS included in the CSI-RS report regarding a plurality of beams on carrier 1, and the sounding reference signal (SRS) regarding a plurality of beams on carrier 1.

[0521] Optionally, the auxiliary information #b may include the real-time optimal beam on carrier 1.

[0522] S830: The base station determines the real-time (current) optimal beam on carrier 1 based on the auxiliary information #b.

[0523] Based on the auxiliary information #b fed back by the UE in step S820, the following partial embodiments for determining the real-time (current) optimal beam on carrier 1 are provided, including the following:

[0524] Method 1: The base station determines the real-time (current) optimal beam on carrier 1, that is, the beam corresponding to the highest RSRP or the highest RSRQ, based on the RSRP or RSRQ of the CSI-RS included in the CSI-RS report regarding a plurality of beams on carrier 1 and fed back by the UE.

[0525] Method 2: The base station determines the real-time (current) optimal beam on carrier 1, that is, the beam corresponding to the maximum CQI value, based on the CQI which is of the CSI-RS, included in the CSI-RS report regarding a plurality of beams on carrier 1 and fed back by the UE.

[0526] Method 3: The UE transmits SRS on multiple beams on Carrier 1, and the base station determines the real-time (current) optimal beam on Carrier 1 based on the SRS, for example, the beam corresponding to the maximum RSRP or RSRQ of the SRS.

[0527] S840: The base station determines one or more optimal beams on Carrier 2 based on the optimal beam on Carrier 1 and the optimal beam difference between multiple carriers.

[0528] Note that in this embodiment, when the UE does not feedback the auxiliary information regarding Carrier 2 (for example, that of CSI-RS, RSRP, RSRQ, or CQI included in the CSI-RS report regarding Carrier 2, and SRS transmitted on Carrier 2), the UE performs transmission on Carrier 1 and transmits the auxiliary information regarding Carrier 1, as a result, the optimal beam most suitable for Carrier 2 is further estimated.

[0529] First, the optimal beam correspondence relationship is that Carrier 1 and Carrier 2 share the same optimal beam.

[0530] For example, when the real-time optimal beam on Carrier 1 is Beam 1, the real-time optimal beam on Carrier 2 is also Beam 1. When the real-time optimal beam on Carrier 1 is Beam 2, the real-time optimal beam on Carrier 2 is also Beam 2.

[0531] Second, when the optimal beam correspondence relationship is such that when the optimal beam A1 is used on Carrier 1, the optimal beams B1, B2, and B3 can be used on Carrier 2, or when the optimal beam A2 is used on Carrier 1, the optimal beams B4, B5, and B6 can be used on Carrier 2.

[0532] For example, when the real-time optimal beam on carrier 1 is beam A1, the real-time optimal beam on carrier 2 is one of beams B1, B2, and B3. When the real-time optimal beam on carrier 1 is beam A2, the real-time optimal beam on carrier 2 is one of beams B4, B5, and B6.

[0533] S850: The base station transmits DCI#Aa to the UE.

[0534] Therefore, the UE receives DCI#Aa from the base station.

[0535] DCI#Aa indicates handover and the spectrum used (carrier 1 + carrier 2). That is, the UE can perform transmission on both carrier 1 and carrier 2.

[0536] Note that step S820 indicates that the UE performs transmission on carrier 1, and the base station can determine the real-time optimal beam on carrier 2 after steps S830 and S840 are performed. Step S850 indicates that the UE can perform transmission on both carrier 1 and carrier 2. That is, DCI#Aa indicates that the UE can be handed over from carrier 1 to carrier 1 + carrier 2.

[0537] It should be understood that in this embodiment, normal communication can be performed without feedback of channel information on carrier 2, the transmission efficiency on carrier 2 can be improved, the delay of the transmission performed by using carrier 2 can be reduced, and the ratio of high-bandwidth transmission can be increased.

[0538] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE can perform transmission only on carrier 2.

[0539] For a specific embodiment showing the spectrum (Carrier 1 + Carrier 2) in which DCI#Aa is handed over and used, please refer to step S450. For the sake of brevity, the details will not be described again in this specification.

[0540] S860: The base station performs transmission and measurement by using the optimal beams on Carrier 1 and Carrier 2.

[0541] The optimal beam on Carrier 2 is one or more of the real-time optimal beams obtained in step S840.

[0542] In this step, before the UE feeds back the channel-related information on Carrier 2, the base station estimates the real-time optimal beam on Carrier 2 by using the real-time optimal beam on Carrier 1 and the optimal beam difference between carriers, and performs resource scheduling and transmission.

[0543] In one embodiment, when the real-time optimal beam used by the base station on Carrier 1 is Beam A1, the real-time optimal beam used on Carrier 2 is one or more of Beams B1, B2, and B3. When the real-time optimal beam used by the base station on Carrier 1 is Beam A2, the real-time optimal beam used on Carrier 2 is one of Beams B4, B5, and B6.

[0544] In another embodiment, the base station uses the same optimal beam on Carrier 1 and Carrier 2. For example, when the real-time optimal beam used by the base station on Carrier 1 is Beam 1, the real-time optimal beam used on Carrier 2 is also Beam 1. When the real-time optimal beam used by the base station on Carrier 1 is Beam 2, the real-time optimal beam used on Carrier 2 is also Beam 2.

[0545] The foregoing possible embodiments are merely examples for explanation and should not constitute any limitation to the technical solutions in this application.

[0546] In conclusion, the base station estimates the optimal beam (or optimal beam range) on another carrier where channel information is not fed back based on the optimal beam on the carrier where channel information is fed back by obtaining the optimal beam difference of UEs on different carriers. This improves the transmission efficiency before channel-related information is fed back on another carrier, reduces the delay of the transmission implemented by using another carrier, increases the proportion of high-bandwidth transmission, and solves the problem that the channel information on another carrier where channel information is not fed back is unknown.

[0547] FIG. 9 is a schematic flowchart of a wireless communication method 900 according to an embodiment of this application. The difference between method 900 and method 400 is as follows: In this embodiment, the UE reports an identifier indicating whether the UE is moving, and the base station determines whether the UE needs to re-scan for the optimal beam according to whether the UE is moving. The specific embodiment steps include the following steps.

[0548] S910: The UE performs transmission on the optimal beams on both carrier 1 and carrier 2, and transmits the auxiliary information related to carrier 1 and carrier 2.

[0549] The auxiliary information may include the RSRP or RSRQ of the CSI-RS included in the CSI-RS report regarding a plurality of beams on carrier 1 and carrier 2, the CQI of the CSI-RS included in the CSI-RS report regarding a plurality of beams on carrier 1 and carrier 2, and the sounding reference signal (SRS) regarding a plurality of beams on carrier 1 and carrier 2.

[0550] Optionally, the auxiliary information is the optimal beam correspondence relationship of the UE on carrier 1 and carrier 2, or the auxiliary information is the real-time (current) optimal beam separately used by the UE on carrier 1 and carrier 2.

[0551] S920: The base station determines the real-time (current) optimal beam on carrier 2 based on the auxiliary information regarding carrier 2.

[0552] Based on the auxiliary information fed back by the UE in step S910, some embodiments are provided for determining the real-time (current) optimal beam on carrier 1, including the following:

[0553] Method 1: The base station determines the real-time (current) optimal beam on carrier 1 and carrier 2, that is, the beam corresponding to the highest RSRP or the highest RSRQ, based on the RSRP or RSRQ of CSI-RS included in the CSI-RS report for multiple beams on carrier 1 and carrier 2 and fed back by the UE.

[0554] Method 2: The base station determines the real-time (current) optimal beam on carrier 1 and carrier 2, that is, the beam corresponding to the maximum CQI value, based on the CQI included in the CSI-RS report for multiple beams on carrier 1 and carrier 2 and fed back by the UE, which is for CSI-RS.

[0555] Method 3: The UE transmits SRS on multiple beams on carrier 1 and carrier 2, and the base station determines the real-time (current) optimal beam on carrier 1 and carrier 2 based on the SRS, for example, the beam corresponding to the maximum RSRP or RSRQ of the SRS.

[0556] S930: The UE transmits an identifier indicating whether the UE has moved to the base station.

[0557] Therefore, the base station receives from the UE an identifier indicating whether the UE has moved.

[0558] It should be noted that the prerequisite for implementing this step is that the UE does not perform transmission on carrier 2 and no longer transmits auxiliary information on carrier 2 to the base station. In other words, in this case, the UE performs transmission on carrier 1, and the UE transmits auxiliary information to the base station on carrier 1.

[0559] Therefore, if the UE continues to schedule the spectrum resources on carrier 2, the UE needs to report an identifier indicating whether the UE has moved in order to determine whether the optimal beam on carrier 2 needs to be re-scanned.

[0560] S940: The base station determines whether the UE needs to re-scan the optimal beam on carrier 2 based on the identifier reported by the UE and indicating whether the UE has moved.

[0561] S950: The base station transmits information to the UE to indicate whether the UE needs to re-scan the optimal beam on carrier 2.

[0562] For example, according to the foregoing steps S930 to S950, if the UE reports an identifier indicating that the UE has not moved, the base station determines that the UE does not need to re-scan the optimal beam on carrier 2 and indicates it. That is, the UE may continue to use the optimal beam on carrier 2 in step S910 for transmission. If the UE reports an identifier indicating that the UE has moved, the base station determines that the UE needs to re-scan the optimal beam on carrier 2 and indicates it. That is, in subsequent resource scheduling, the UE needs to perform transmission by using the optimal beam scanned on carrier 2.

[0563] S960: The base station transmits DCI to the UE, and the DCI indicates handover and the spectrum to be used (Carrier 1 + Carrier 2). That is, the UE can perform transmission on both Carrier 1 and Carrier 2.

[0564] For example, the base station determines whether the UE needs to re-scan the optimal beam based on the identifier reported by the UE in step S920 and indicating whether the UE has moved.

[0565] Note that step S930 indicates that the UE performs transmission on Carrier 1, and after steps S940 and S950 are performed, the base station can determine whether the UE needs to re-scan the optimal beam on Carrier 2. Step S960 indicates that the UE can perform transmission on both Carrier 1 and Carrier 2. That is, the DCI indicates that the UE can be handed over from Carrier 1 to Carrier 1 + Carrier 2. The optimal beam on Carrier 1 remains unchanged, and in step S930, the information indicating whether the optimal beam on Carrier 2 changes depends on whether the UE moves.

[0566] It should be understood that in this embodiment, normal communication can be performed without real-time feedback of channel information on Carrier 2, the transmission efficiency on Carrier 2 can be improved, the delay of the transmission implemented by using Carrier 2 can be reduced, and the ratio of high-bandwidth transmission can be increased.

[0567] Optionally, this embodiment may alternatively be for indicating a UE to be handed over from carrier 1 to carrier 2. That is, the UE may perform transmission only on carrier 2. If the UE does not move in step S930, in step S910, the optimal beam on carrier 2 does not change and remains the optimal transmission beam on carrier 2. If the UE moves in step S930, the optimal beam on carrier 2 changes. That is, the UE scans the real-time (current) optimal beam re-determined on carrier 2 for resource scheduling.

[0568] S970: The base station performs transmission and measurement by using the optimal beams on carrier 1 and carrier 2.

[0569] The optimal beam on carrier 2 is the real-time optimal beam determined after step S950.

[0570] In one embodiment, when the UE performs transmission on carrier 1 and the UE does not move, the optimal beam on carrier 2 does not change. That is, the base station performs transmission and measurement on the original optimal beam on carrier 2.

[0571] In another embodiment, when the UE performs transmission on carrier 1 and the UE moves, the optimal beam on carrier 2 changes. That is, the base station performs transmission and measurement on the optimal beam that is on carrier 2 and is determined after the UE performs re-scanning.

[0572] The foregoing possible embodiments are merely examples for explanation and should not constitute any limitation to the technical solutions in this application.

[0573] As a conclusion, the base station obtains an identifier indicating whether the UE has moved, reduces the number of times the UE re-scans for the optimal beam, thereby reducing the delay in obtaining the optimal beam by the UE on another carrier, and increasing the ratio of high-bandwidth transmission. In addition, the problem that the channel information on another carrier for which channel information is not fed back is unknown is solved.

[0574] It should be noted that when the UE communicates big data, multiple carriers need to be activated and channel measurements need to be performed. Before the channel measurement results are obtained, the channel information regarding the carrier is unknown. As a result, the transmission rate of multi-carriers decreases. Furthermore, the system transmission performance is affected. Therefore, in a multi-carrier application scenario, to better solve this problem and implement the wireless communication methods in FIGS. 2 to 9, before performing wireless communication with the base station, the UE first needs to complete the initial access process. In other words, when interacting with the base station, the UE is in the radio resource control connected state RRC_CONNECTED.

[0575] In the embodiments of the present application, it should be understood that the pre-defined signal type is transmitted by using one of a plurality of downlink carriers. The pre-defined signal type includes a synchronization signal block (SSB) and remaining minimum system information (RMSI). RMSI may also be referred to as system information block 1 (SIB1). SIB1 includes information about a plurality of uplink carriers and / or information about a plurality of downlink carriers. The information about the downlink carrier includes one or more of a carrier frequency, a carrier identifier (e.g., an index), the position of control resource set 0 (CORESET 0), a subcarrier spacing (SCS) available for the carrier, and the start position and bandwidth of a resource block (RB) available corresponding to the subcarrier spacing. CORESET 0 is common control resource block 0. The information about the uplink carrier includes one or more of a carrier frequency, a carrier identifier (e.g., an index), a subcarrier spacing available for the carrier, the start position and bandwidth of a resource block RB available corresponding to the subcarrier spacing, and a random access channel (RACH) resource. The plurality of carriers in SIB1 may belong to one cell or may belong to a plurality of cells. This is not specifically limited in the present application.

[0576] To ensure that the technical solutions in the present application are more complete and clearer, in the following, in possible embodiments such as an embodiment in which control resource set 0 (CORESET 0) is configured on one or more downlink carriers of a UE and RACH resources are configured on one or more uplink carriers of the UE, the process by which the UE completes initial access in a multi-carrier scenario will be described separately.

[0577] FIG. 10 is a schematic diagram of an example of a method for performing initial access by a UE. In this embodiment, control resource set 0 (CORESET 0) is configured on only one downlink carrier of the UE, and RACH resources are configured on one or more uplink carriers of the UE. The method 1000 of a specific embodiment includes the following steps.

[0578] S1010: The UE transmits a preamble to the base station on the RACH resource on the first uplink carrier, and the sequence of the preamble or the RB position of the RACH resource can be bound to the uplink carrier predicted by the UE to be used in the radio resource control RRC connected state.

[0579] Optionally, before performing step S1010, the UE needs to determine the first uplink carrier.

[0580] The first uplink carrier is an uplink carrier randomly selected from one or more uplink carriers on which the RACH resources are configured.

[0581] S1020: The UE monitors DCI on the first downlink carrier.

[0582] The DCI is for scheduling a random access response (RAR), and control resource set 0 (CORESET 0) is configured on the first downlink carrier. The RAR indicates whether the preamble transmitted by the UE in step S1010 is normally received by the base station. In addition, the RAR indicates an uplink resource for transmitting the random access message 3 (Msg 3).

[0583] S1030: The UE transmits Msg 3 to the base station on the third uplink carrier by using the uplink resource in the RAR.

[0584] That is, the UE transmits Msg 3 to the base station on the third uplink carrier based on the permission of the RAR, the indicated resources, and the indicated format.

[0585] Therefore, the base station receives Msg 3 from the UE on the third uplink carrier.

[0586] In a possible embodiment, the RAR received by the UE in step S1020 can carry indication information, and the indication information indicates that the uplink carrier for communicating Msg 3 is the third uplink carrier. The third uplink carrier may be the same as or different from the first uplink carrier, or the third uplink carrier may be the same as or different from the uplink carrier predicted by the UE to be used in the RRC connected state. This is not specifically limited in this application.

[0587] In another possible embodiment, the RAR received by the UE in step S1020 does not have to carry indication information, and the third uplink carrier is determined based on a predefined method. For example, the first uplink carrier is the third uplink carrier, the uplink carrier within the same band as the downlink carrier of CORESET 0 is the third uplink carrier, or the uplink carrier predicted by the UE to be used in the RRC connected state is the third uplink carrier.

[0588] Optionally, the base station transmits signaling to the UE on the first downlink carrier indicating that the initial access has been completed.

[0589] Therefore, the UE receives the signaling indicating that the initial access has been completed from the base station on the first downlink carrier and enters the RRC connected state.

[0590] In this case, the signaling indicating that the initial access has been completed includes the indication information of the uplink carrier and downlink carrier on which the UE operates. Alternatively, the uplink carrier and downlink carrier on which the UE operates are determined based on a protocol predefined manner. For example, the downlink carrier on which the UE operates is the downlink carrier on which CORESET 0 is configured, i.e., the first downlink carrier. For example, if the preamble sequence or the RB position of the RACH resource is bound to the uplink carrier predicted by the UE when used in the RRC connected state, the uplink carrier on which the UE operates is the bound uplink carrier. Alternatively, the uplink carrier on which the UE operates is the uplink carrier on which the UE transmits the preamble, i.e., the first uplink carrier. Alternatively, the uplink carrier on which the UE operates is the uplink carrier on which the UE transmits Msg 3, i.e., the third uplink carrier.

[0591] In this embodiment, load balancing of the UE on different uplink carriers can be enabled, the access delay of the UE can be reduced, and the network flexibility can be improved. In the case of the non-competitive random access process, the base station can also select the random access resources on any uplink carrier and may transmit the random access resources to the UE.

[0592] FIG. 11 is a schematic diagram of another example of a method for the UE to perform initial access. In this embodiment, the control resource set 0 (CORESET 0) is set for a plurality of downlink carriers of the UE, and the RACH resources are set for one or more uplink carriers of the UE. The method 1100 of a specific embodiment includes the following steps.

[0593] S1110: The UE transmits a preamble to the base station on the RACH resources on the second uplink carrier.

[0594] The preamble sequence or the RB location of the RACH resource may be bound to the uplink carrier predicted by the UE to be used in the Radio Resource Control (RRC) connected state, or may be bound to the downlink carrier predicted by the UE to be used in the RRC connected state.

[0595] Optionally, before performing step S1110, the UE needs to determine a second uplink carrier.

[0596] The second uplink carrier is an uplink carrier randomly selected from one or more uplink carriers on which the RACH resource is configured.

[0597] S1120: The UE monitors DCI on the downlink carrier.

[0598] The DCI is for scheduling the Random Access Response (RAR), and the RAR is communicated on the second downlink carrier.

[0599] Optionally, the UE monitors DCI for scheduling the RAR on multiple downlink carriers on which CORESET 0 is configured.

[0600] Optionally, if the preamble sequence or the RB position of the RACH resource is bound to the downlink carrier predicted by the UE to be used in the RRC connected state, the UE monitors DCI for scheduling the RAR on CORESET 0 on the bound downlink carrier.

[0601] The RAR indicates whether the preamble transmitted by the UE in step S1110 was successfully received by the base station. In addition, the RAR indicates the uplink resources for transmitting the Random Access Message 3 (Msg 3).

[0602] S1130: The UE transmits Msg 3 to the base station on the fourth uplink carrier by using the uplink resources in the RAR.

[0603] That is, the UE transmits Msg 3 to the base station on the fourth uplink carrier based on the RAR grant, the indicated resources, and the indicated format.

[0604] Therefore, the base station receives Msg 3 from the UE on the fourth uplink carrier.

[0605] In a possible embodiment, the RAR received by the UE in step S1120 can carry indication information, and the indication information indicates that the uplink carrier for communicating Msg 3 is the fourth uplink carrier. The fourth uplink carrier may be the same as or different from the second uplink carrier, or the fourth uplink carrier may be the same as or different from the uplink carrier predicted by the UE to be used in the RRC connected state. This is not specifically limited in this application.

[0606] In another possible embodiment, the RAR received by the UE in step S1120 does not have to carry indication information, and the fourth uplink carrier is determined based on a protocol pre - defined method. For example, the second uplink carrier is the fourth uplink carrier, the uplink carrier in the same band as the downlink carrier for receiving the RAR is the fourth uplink carrier, or the uplink carrier predicted by the UE to be used in the RRC connected state is the fourth uplink carrier.

[0607] Optionally, the base station transmits signaling to the UE on the downlink carrier indicating that the initial access has been completed.

[0608] Therefore, the UE receives signaling indicating that the initial access has been completed from the base station on the downlink carrier and enters the RRC connected state.

[0609] The downlink carrier is the same as the downlink carrier used by the base station to transmit the RAR in step S1120, i.e., the second downlink carrier.

[0610] In this case, the signaling indicating that the initial access has been completed includes the indication information of the uplink carrier and the downlink carrier on which the UE operates. Alternatively, the uplink carrier and the downlink carrier on which the UE operates are determined based on a protocol predefined method. For example, the downlink carrier on which the UE operates is the downlink carrier on which the base station transmits the RAR, i.e., the second downlink carrier. Alternatively, if the preamble sequence or the RB position of the RACH resource is bound to the downlink carrier predicted by the UE to be used in the RRC connected state, the downlink carrier on which the UE operates is the bound downlink carrier. For example, if the preamble sequence or the RB position of the RACH resource is bound to the uplink carrier predicted by the UE to be used in the RRC connected state, the uplink carrier on which the UE operates is the bound uplink carrier. Alternatively, the uplink carrier on which the UE operates is the uplink carrier on which the UE transmits the preamble, i.e., the second uplink carrier. Alternatively, the uplink carrier on which the UE operates is the uplink carrier on which the UE transmits Msg3, i.e., the fourth uplink carrier.

[0611] In this embodiment, load balancing of the UE on different uplink and downlink carriers can be enabled, the access delay of the UE can be reduced, and network flexibility can be improved. In the case of the non-competitive random access process, the base station can also select random access resources on any uplink or downlink carrier and transmit the random access resources to the UE.

[0612] In conclusion, after completing the initial access, the UE performs wireless communication with the base station. The base station obtains the path loss difference of the UE between different carriers, and based on the channel information on the carrier, the channel information on another carrier where the channel information is not fed back can be obtained, and the transmission efficiency before the channel-related information is fed back on another carrier is improved, and as a result, the system transmission performance can be improved.

[0613] In the above, with reference to FIGS. 1 to 11, the embodiments of the wireless communication method in the present application have been described in detail. Hereinafter, with reference to FIGS. 12 and 13, the embodiments on the wireless communication device side in the present application will be described in detail. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, for the parts not described in detail, please refer to the above-described method embodiments.

[0614] FIG. 12 is a schematic block diagram of a wireless communication device according to an embodiment of the present application. As shown in FIG. 12, the wireless communication device 1000 may include a processing unit 1100 and a transceiver unit 1200.

[0615] Optionally, the wireless communication device 1000 may correspond to the terminal device in the above-described method embodiments, and for example, may be a terminal device or a component (for example, a circuit, a chip, or a chip system) configured in the terminal device.

[0616] It should be understood that the wireless communication device 1000 can correspond to the terminal device in the method 200, method 300, method 400, method 500, method 600, method 700, method 800, method 900, method 1000, and method 1100 according to the embodiments of the present application. The wireless communication device 1000 may include a unit configured to implement the method performed by the terminal device in the method 200 of FIG. 2, the method 300 of FIG. 3, the method 400 of FIG. 4, the method 500 of FIG. 5, the method 600 of FIG. 6, the method 700 of FIG. 7, the method 800 of FIG. 8, the method 900 of FIG. 9, the method 1000 of FIG. 10, or the method 1100 of FIG. 11. In addition, the unit in the wireless communication device 1000, as well as the other operations and / or functions described above, are separate for implementing the corresponding procedures in the method 200 in FIG. 2, the method 300 in FIG. 3, the method 400 in FIG. 4, the method 500 in FIG. 5, the method 600 in FIG. 6, the method 700 in FIG. 7, the method 800 in FIG. 8, the method 900 in FIG. 9, the method 1000 in FIG. 10, or the method 1100 in FIG. 11.

[0617] For example, the transceiver unit 1200 is used by the terminal device to transmit first information to the network device on a first carrier, where the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes the modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier.

[0618] The transceiver unit 1200 is further used by the terminal device to receive second information from the network device, where the second information is for scheduling transmission resources on a second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes the MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the channel information on the first carrier.

[0619] For example, the transceiver unit 1200 is further used by the terminal device to receive channel information on a first carrier and second association information from a network device, the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, and the second association information indicates channel difference information between the first carrier and the second carrier.

[0620] The processing unit 1100 is used by the terminal device to determine channel information on a second carrier based on the channel information on the first carrier and the second association information, and the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier.

[0621] When the wireless communication device 1000 is a terminal device, the transceiver unit 1200 in the wireless communication device 1000 may be implemented by using a transceiver, for example, may correspond to the transceiver 2020 in the wireless communication device 2000 shown in FIG. 13, and it should be further understood that the processing unit 1100 in the wireless communication device 1000 may be implemented by using at least one processor, for example, may correspond to the processor 2010 in the wireless communication device 2000 shown in FIG. 13.

[0622] When the wireless communication device 1000 is a chip or chip system configured in a terminal device, the transceiver unit 1200 in the wireless communication device 1000 may be implemented by using an input / output interface, a circuit, etc., and it should be further understood that the processing unit 1100 in the wireless communication device 1000 may be implemented by using a processor, a microprocessor, an integrated circuit, etc. integrated on the chip or chip system.

[0623] Optionally, the wireless communication device 1000 may correspond to the network device in the embodiment of the foregoing method, and may be, for example, a network device or a component configured within the network device (such as a circuit, a chip, or a chip system).

[0624] It should be understood that the wireless communication device 1000 may correspond to the network device in the methods 200, 300, 400, 500, 600, 700, 800, 900, 1000, and 1100 according to the embodiments of the present application. The wireless communication device 1000 may include a unit configured to implement the method implemented by the network device in the method 200 of FIG. 2, the method 300 of FIG. 3, the method 400 of FIG. 4, the method 500 of FIG. 5, the method 600 of FIG. 6, the method 700 of FIG. 7, the method 800 of FIG. 8, the method 900 of FIG. 9, the method 1000 of FIG. 10, or the method 1100 of FIG. 11. In addition, the unit in the wireless communication device 1000, as well as the other operations and / or functions described above, are separate for implementing the corresponding procedures in the method 200 of FIG. 2, the method 300 of FIG. 3, the method 400 of FIG. 4, the method 500 of FIG. 5, the method 600 of FIG. 6, the method 700 of FIG. 7, the method 800 of FIG. 8, the method 900 of FIG. 9, the method 1000 of FIG. 10, or the method 1100 of FIG. 11.

[0625] For example, the transceiver unit 1200 is used by the network device to receive first information from the terminal device on a first carrier, the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier.

[0626] The transceiver unit 1200 is further used by the network device to send the second information to the terminal device, and the second information is for scheduling transmission resources on a second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes the MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the channel information on the first carrier.

[0627] For example, the transceiver unit 1200 is used by the network device to send the channel information on the first carrier and the second association information to the terminal device, the channel information on the first carrier includes the modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier, the second association information indicates the channel difference information between the first carrier and the second carrier, the channel information on the first carrier and the second association information are for determining the channel information on the second carrier, and the channel information on the second carrier includes the MCS and / or spectral efficiency on the second carrier.

[0628] When the wireless communication device 1000 is a network device, the transceiver unit 1200 in the wireless communication device 1000 may be implemented by using a transceiver, for example, may correspond to the transceiver 2020 in the wireless communication device 2000 shown in FIG. 13, and it should be further understood that the processing unit 1100 in the wireless communication device 1000 may be implemented by using at least one processor, for example, may correspond to the processor 2010 in the wireless communication device 2000 shown in FIG. 13.

[0629] When the wireless communication device 1000 is a chip or chip system configured within a network device, the transceiver unit 1200 within the wireless communication device 1000 may be implemented by using an input / output interface, a circuit, etc., and it should be further understood that the processing unit 1100 within the wireless communication device 1000 may be implemented by using a processor, a microprocessor, an IC, etc. integrated on the chip or chip system.

[0630] FIG. 13 is another schematic block diagram of a wireless communication device 2000 according to an embodiment of the present application. As shown in FIG. 13, the wireless communication device 2000 includes a processor 2010, a transceiver 2020, and a memory 2030. The processor 2010, the transceiver 2020, and the memory 2030 communicate with each other via an internal connection path. The memory 2030 is configured to store instructions. The processor 2010 is configured to execute the instructions stored in the memory 2030 to control the transceiver 2020 to transmit signals and / or receive signals.

[0631] It should be understood that the wireless communication device 2000 may correspond to the network device or the terminal device in the embodiment of the foregoing method, and may be configured to perform the steps and / or procedures implemented by the network device or the terminal device in the embodiment of the foregoing method. Optionally, the memory 2030 includes a read-only memory and a random access memory, and can provide instructions and data to the processor. A part of the memory may further include a non-volatile random access memory. The memory 2030 may be an independent device or may be integrated with the processor 2010. The processor 2010 may be configured to execute the instructions stored in the memory 2030. When the processor 2010 executes the instructions stored in the memory, the processor 2010 is configured to perform the steps and / or procedures corresponding to the network device or the terminal device in the embodiment of the foregoing method.

[0632] Optionally, the wireless communication device 2000 is the terminal device in the foregoing embodiment.

[0633] Optionally, the wireless communication device 2000 is the network device in the foregoing embodiment.

[0634] The transceiver 2020 may include a transmitter and a receiver. The transceiver 2020 may further include an antenna, and there may be one or more antennas. The processor 2010, the memory 2030, and the transceiver 2020 may be components integrated on different chips. For example, the processor 2010 and the memory 2030 may be integrated on a baseband chip, and the transceiver 2020 may be integrated on a radio frequency chip. Alternatively, the processor 2010, the memory 2030, and the transceiver 2020 may be components integrated on the same chip. This is not limited in the present application.

[0635] Optionally, the wireless communication device 2000 is a component configured within a terminal device, such as a circuit, a chip, or a chip system.

[0636] Optionally, the wireless communication device 2000 is a component configured within a network device, such as a circuit, a chip, or a chip system.

[0637] Alternatively, the transceiver 2020 may be a communication interface such as an input / output interface or a circuit. The transceiver 2020, the processor 2010, and the memory 2030 may be integrated on the same chip, for example, integrated on a baseband chip.

[0638] It should be understood that the processor in the embodiments of this application may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general-purpose processor may be a microprocessor, any conventional processor, etc.

[0639] It should be further understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include a volatile memory and a non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM) used as an external cache. By way of example and not limitation, many forms of RAM may be used, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory in the systems and methods herein is intended to include any of these and other suitable types of memory, but is not limited thereto.

[0640] The method steps in the embodiments of the present application may be implemented in a hardware manner or may be implemented in a manner of executing software instructions by a processor. The software instructions can consist of corresponding software modules. The software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium well known in the art. For example, the storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may alternatively be a component of the processor. The processor and the storage medium may be disposed in an ASIC. In addition, the ASIC can be disposed within a network device or a terminal device. Of course, the processor and the storage medium may alternatively exist as individual components within the network device or the terminal device.

[0641] All or part of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement an embodiment, all or part of the embodiment may be implemented in the form of a computer program product. The computer program product includes one or more computer programs and instructions. When the computer program or instructions are loaded and executed on a computer, all or part of the procedures or functions in the embodiments of the present application are executed. The computer may be a general-purpose computer, a dedicated computer, a computer network, a network device, a user device, or another programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions may be transmitted wired or wirelessly from a website, a computer, a server, or a data center to another website, a computer, a server, or a data center. The computer-readable storage medium may be any usable medium accessible by a computer or a data storage device such as a server or a data center that integrates one or more usable media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape, an optical medium, such as a digital video disc, or a semiconductor medium, such as a solid state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium or may include two types of media, a volatile storage medium and a non-volatile storage medium.

[0642] It should be understood that the foregoing embodiments may be independent solutions or may be combined based on internal logic. These solutions fall within the protection scope of this application. The terminal device and / or network device may implement some or all of the steps in the embodiments. These steps or operations are merely examples. In this application, other operations or variations of various operations may be further implemented. In addition, the steps may be implemented in different sequences presented in the embodiments, and it is not necessary to implement all the operations in the embodiments of this application.

[0643] It can be understood that the numbers in the embodiments of this application are used only for easy distinction for the purpose of explanation and are not intended to limit the scope of the embodiments of this application. The sequence numbers of the foregoing processes do not mean the execution sequence. The execution order of the process should be determined based on the functions and internal logic of the process and should not constitute any limitation to the process embodiments of this application.

[0644] As used herein, terms such as "component", "module", and "system" refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. As shown by using a figure, both a computing device and an application running on the computing device can be components. One or more components can exist within a process and / or an execution thread, and a component can be located on one computer and / or can be distributed between two or more computers. In addition, these components can be executed by various computer-readable media storing various data structures. A component can communicate by using a local process and / or a remote process and, for example, based on a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, a distributed system, and / or data over a network such as the Internet interacting with other systems).

[0645] One of ordinary skill in the art may recognize that, in combination with the examples described in the embodiments disclosed herein, unit and algorithm steps can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether a function is implemented by hardware or software depends upon the particular application example of the technical solution and design constraints. One of ordinary skill in the art may implement the described functions for each particular application example using different methods, but such implementations should not be regarded as exceeding the scope of this application.

[0646] For the sake of convenience and concise description, for the detailed operation processes of the aforementioned systems, apparatuses, and units, those skilled in the art can clearly understand by referring to the corresponding processes in the embodiments of the aforementioned methods. Details will not be described again in this specification.

[0647] In some embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the embodiments of the aforementioned apparatuses are merely examples. For example, the division into units is merely a logical function division, and other divisions during actual implementation may be possible. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the mutual connection, direct connection, or communication connection shown or discussed can be implemented by using some interfaces. The indirect connection or communication connection between apparatuses or units may be implemented in electrical, mechanical, or other forms.

[0648] The units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units. They may be arranged at one location, or may be distributed over multiple network units. Some or all of the units can be selected based on the actual requirements for achieving the objectives of the solutions in the embodiments.

[0649] In addition, the functional units in the embodiments of this application may be integrated into one processing unit, each of the units may physically exist alone, or two or more units may be integrated into one unit.

[0650] When the function is implemented in the form of a software functional unit and sold or used as an independent product, the function can be stored in a computer-readable storage medium. Based on such an understanding, essentially the technical solution in the present application, the part contributing to the prior art, or a part of the technical solution can be implemented in the form of a software product. The computer software product is stored in a storage medium and includes some instructions for instructing a computer device (which may be a personal computer, a server, a network device, etc.) to execute all or part of the steps of the method in the embodiments of the present application. The aforementioned storage medium includes any medium that can store program codes, such as flash memory, removable hard disk, read-only memory (ROM), random access memory (RAM), disk, or optical disk.

[0651] The foregoing description is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any modification or substitution that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Description of Reference Signs

[0652] 1,2 carrier 100 wireless communication system 101 network device 102, 103, 104, 105, 106, 107 terminal device 200, 300, 400, 500, 600, 700, 800, 900 method 1000 wireless communication method, wireless communication device 1100 wireless communication method, processing unit 1200 transceiver unit 2000 wireless communication device 2010 processor 2020 transceiver 2030 memory

Claims

1. A wireless communication method executed by a communication device, comprising: transmitting third information to a network device, wherein the third information indicates first association information, and the first association information indicates channel difference information between a first carrier and a second carrier; transmitting first information to the network device on the first carrier, wherein the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier; receiving second information from the network device, wherein the second information is for scheduling transmission resources on the second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the first association information and the channel information on the first carrier; A method comprising the above steps.

2. The first association information includes one or more of the following information, namely: propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence relationship, and spectral efficiency correspondence relationship The method according to claim 1.

3. The value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], where W satisfies W = log 2 (1 + 10 Δ／10 (2 Z - 1)) and Δ is the propagation path loss difference between the second carrier and the first carrier, Z is the spectral efficiency corresponding to the MCS index U on the first carrier, and the value range of the MCS index corresponding to the spectral efficiency on the second carrier is [V - 2, V + 1]. The method according to claim 1 or 2.

4. The propagation path loss difference Δ between the first carrier and the second carrier satisfies Δ=10log 10 ((2 W -1) / (2 Z -1)) where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier. The method according to claim 3.

5. The first information includes the following information, namely: The reference signal received power (RSRP) of the first carrier, the reference signal received quality (RSRQ) of the first carrier, the channel quality indication (CQI) of the first carrier, the sounding reference signal (SRS) of the first carrier, the acknowledgment (ACK) or negative acknowledgment (NACK) information of the communication device of the first carrier, and information indicating whether the communication device has successfully demodulated the information of the first carrier The method according to claim 1 or 2, comprising one or more of the above. **Claim 6** A wireless communication method executed by a communication device, comprising: Receiving third information from a terminal device, where the third information indicates first association information, and the first association information indicates channel difference information between a first carrier and a second carrier; Receiving first information from the terminal device on the first carrier, where the first information is for determining channel information on the first carrier, and the channel information on the first carrier includes a modulation and coding scheme (MCS) and / or spectral efficiency on the first carrier; Transmitting second information to the terminal device, where the second information is for scheduling transmission resources on the second carrier, the second information indicates channel information on the second carrier, the channel information on the second carrier includes an MCS and / or spectral efficiency on the second carrier, and the channel information on the second carrier is determined based on the first association information and the channel information on the first carrier; A method comprising the above steps. **Claim 7** Determining the channel information of the first carrier based on the first information; Determining the channel information of the second carrier based on the first association information and the channel information of the first carrier The method according to claim 6, further comprising the above steps. **Claim 8** The first association information includes one or more of the following information, namely: Propagation path loss difference, antenna efficiency difference, optimal beam difference, MCS correspondence, and spectral efficiency correspondence The method according to claim 6 or 7, comprising one or more of the above. **Claim 9** The value range of the spectral efficiency on the second carrier is [0.8W, 1.1W], where W satisfies W = log 2 (1 + 10 Δ／10 (2 Z - 1)) , Δ is the propagation path loss difference between the second carrier and the first carrier, Z is the spectral efficiency corresponding to the index U of the real-time MCS on the first carrier, and the value range of the MCS index corresponding to the spectral efficiency on the second carrier is [V - 2, V + 1]. The method according to claim 6 or 7.

10. The propagation path loss difference Δ between the first carrier and the second carrier satisfies Δ=10log 10 ((2 W -1) / (2 Z -1)) , where W is the spectral efficiency corresponding to the MCS index V on the second carrier, and Z is the spectral efficiency corresponding to the MCS index U on the first carrier. The method according to claim 9.

11. The first information includes the following information, that is, the reference signal received power (RSRP) of the first carrier, the reference signal received quality (RSRQ) of the first carrier, the channel quality indication (CQI) of the first carrier, the sounding reference signal (SRS) of the first carrier, the acknowledgement (ACK) or negative acknowledgement (NACK) information of the communication device for the first carrier, and the information indicating whether the communication device has successfully demodulated the information of the first carrier The method according to claim 6 or 7, including one or more of the above.

12. A communication device comprising means for implementing the method according to claim 1 or 2.

13. A communication device comprising means for implementing the method according to claim 6 or 7.

14. A computer-readable storage medium storing a computer program, which, when executed by a communication device, enables the communication device to implement the method according to claim 1 or 2.

15. A computer-readable storage medium storing a computer program, which, when executed by a communication device, enables the communication device to implement the method according to claim 6 or 7.

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