Reference signaling design and configuration

Abstract

Methods, systems, and apparatuses for digital wireless communication are disclosed, and more specifically, techniques for triggering the transmission of feedback channel state information. In one exemplary aspect, a method for wireless communication is disclosed. The method includes receiving a first message from a wireless communication node by a terminal. The method also includes performing a measurement of the channel state by the terminal. The method further includes the wireless communication node sending a feedback message including information about the channel state, based on the terminal determining that the first message includes an indication for feeding back the measurement of the channel state.

Description

Technical Field

[0001] This patent document generally relates to wireless communication. Background Technology

[0002] Mobile communication technology is propelling the world towards an increasingly connected and networked society. The rapid growth and technological advancements in mobile communications have led to greater demands for capacity and connectivity. Other factors, such as energy consumption, equipment cost, spectrum efficiency, and latency, are also important for meeting the needs of various communication scenarios. Various technologies are being discussed, including new methods for providing higher quality of service. Summary of the Invention

[0003] This document discloses methods, systems, and devices related to digital wireless communication, and more specifically, discloses transmission-related techniques for triggering feedback channel state information.

[0004] In one exemplary aspect, a method for wireless communication is disclosed. The method includes: receiving a first message from a wireless communication node by a terminal. The method further includes: performing a measurement of a channel state by the terminal. The method further includes: sending a feedback message to the wireless communication node based on at least one indication that determines the first message includes feedback of the measurement of the channel state, the feedback message including information about the channel state.

[0005] In another exemplary aspect, a method for wireless communication is disclosed. The method includes: a wireless communication node sending a first message to a terminal, the first message including an indication to instruct the terminal to send a feedback message to the wireless communication node. The method further includes: the wireless communication node receiving a feedback message from the terminal in response to the transmission of the first message, the feedback message including information about channel status.

[0006] In another exemplary aspect, a wireless communication device is disclosed, including a processor. The processor is configured to perform the methods described herein.

[0007] In yet another exemplary aspect, the various techniques described herein can be implemented as processor-executable code and stored on a computer-readable program medium.

[0008] Some embodiments may preferably implement the following technical solutions, which are written in the clause format.

[0009] 1. A technical solution for wireless communication, comprising: receiving a first message from a wireless communication node by a terminal; performing a measurement of channel state by the terminal; and sending a feedback message to the wireless communication node based on determining that the first message includes at least one indication for feeding back the measurement of channel state, the feedback message including information about the channel state.

[0010] 2. According to the technical solution described in Article 1, the information concerning the channel state includes a first type of channel state information, which is measured based on Channel State Information Reference Signal (CSI-RS) resources.

[0011] 3. According to the technical solution described in Clause 1, the indication in the first message for feeding back information related to the channel state includes at least one of the following items: a Channel State Information (CSI) request field, a Cyclic Redundancy Check (CRC) scrambled with a first Radio Network Temporary Identifier (RNTI), a Physical Uplink Control Channel (PUCCH) resource indicator field, a new data indicator field, a redundancy version field, and a priority indicator field.

[0012] 4. The technical solution according to Clause 1, wherein the information concerning the channel state includes a second type of channel state information, which is measured based on any one of the following items: Physical Downlink Shared Channel (PDSCH), Periodic Channel State Information Reference Signal (CSI-RS) resources, and Semi-Persistent Channel State Information Reference Signal (CSI-RS) resources.

[0013] 5. According to the technical solution described in Clause 1, the indication in the first message for feeding back information about the channel state includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state of triggering the first type of channel state information, and a field in the first message indicating the state of triggering the second type of channel state information.

[0014] 6. The technical solution according to Clause 1, wherein the first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space, a second downlink control information (DCI) for scheduling or activating uplink transmission identified in a user equipment (UE)-specific search space, and a third downlink control information (DCI) identified in a group common search space.

[0015] 7. The technical solution according to any one of clauses 1, 2 and 4 further includes: the terminal determining whether the first message includes an indication for triggering a first type of channel state information or a second type of channel state information.

[0016] 8. The technical solution according to Clause 1, wherein the indication for feeding back information about the channel state includes the decoding result of the downlink transmission, the decoding result indicating whether information about the channel state is included in the feedback message.

[0017] 9. The technical solution according to Clause 8, wherein the decoding result is identified by the terminal and the decoding result indicates non-acknowledgment (NACK), which indicates that the decoding of the downlink transmission was unsuccessful, and wherein the downlink transmission is a transmission in the Physical Downlink Shared Channel (PDSCH) scheduled or activated by the first message.

[0018] 10. The technical solution according to Clause 1 further includes: the terminal determining that the first indication field of the first message includes a bit string having any bit read as a non-zero value, wherein the bit string having any bit read as a non-zero value in the first indication field indicates a first type of trigger state, wherein the indication of the first type of trigger state is used to trigger feedback of the first type of channel state information.

[0019] 11. The technical solution according to Clause 10 further includes: the terminal receiving a Radio Resource Control (RRC) message from the wireless communication node, wherein the first type of triggering state is configured by the wireless communication node through the Radio Resource Control (RRC) message.

[0020] 12. The technical solution according to Clause 1 further includes: if the terminal determines that the first indication field of the first message includes a bit string with any bit read as a non-zero value, wherein the first indication field has a bit string with any bit read as a non-zero value, then it indicates a second type of trigger state, wherein the indication of the second type of trigger state is used to trigger a second type of channel state information.

[0021] 13. The technical solution according to Clause 12 further includes: the terminal receiving a Radio Resource Control (RRC) message from the wireless communication node, wherein the second type of triggering state is configured by the wireless communication node through the Radio Resource Control (RRC) message.

[0022] 14. The technical solution according to Clause 1, wherein the indication for feeding back information about the channel state includes identifying the channel state information (CSI) measurement type, wherein the channel state information (CSI) measurement type includes at least one of the following: a first trigger indicating that a first type of channel state information (CSI) measurement will be performed, and a second trigger indicating that a second type of channel state information (CSI) measurement will be performed.

[0023] 15. According to the technical solution described in Clause 1, if a first type of trigger is identified in the first message, the terminal prepares a first format for information related to the channel state, the first format being included in the feedback message.

[0024] 16. According to the technical solution described in Article 1, if a second type of trigger is identified in the first message, the terminal prepares a second format for information about the channel state, wherein the second format is included in the feedback message.

[0025] 17. The technical solution according to Article 16, wherein the second format for channel state information (CSI) feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one sub-band of a first frequency domain range, a wideband channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the last value of a previously fed-out channel quality indicator (CQI) indicating the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the value in the first message indicating the first frequency domain range, and at least one difference between the channel quality indicator (CQI) of at least one sub-band and the wideband channel quality indicator (CQI) of the first frequency domain range.

[0026] 18. The technical solution according to Clause 16, wherein the first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via Radio Resource Control (RRC) signaling for downlink transmission scheduled by the first message, frequency resources for downlink transmission activated by the first message, and frequency resources for Physical Downlink Shared Channel (PDSCH) transmission in semi-persistent scheduling (SPS).

[0027] 19. The technical solution according to Clause 1, wherein determining that the first message includes an indication for providing feedback information about the channel state includes identifying one or more fields in the first message for triggering feedback messages for one or more groups of terminals.

[0028] 20. The technical solution according to Clause 1 further includes: receiving an offset from the wireless communication node by the terminal, the offset indicating a first field to be read in the first message, or indicating that reading begins from a first start bit in one or more fields in the first message.

[0029] 21. The technical solution according to Clause 8, wherein the indication for feeding back information about the channel state includes the decoding result of the downlink transmission after the first repetition.

[0030] 22. The technical solution according to Clause 21, wherein the first repetition count includes at least one of the following: a value equal to 1, a total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling.

[0031] 23. A technical solution for wireless communication, comprising: a wireless communication node sending a first message to a terminal, the first message including at least one indication for instructing the terminal to send a feedback message to the wireless communication node; and in response to the sending of the first message, the wireless communication node receiving a feedback message from the terminal, the feedback message including information about channel status.

[0032] 24. The technical solution according to Clause 23, wherein the information concerning the channel state includes a first type of channel state information, which is measured based on Channel State Information Reference Signal (CSI-RS) resources.

[0033] 25. The technical solution according to Clause 23, wherein the indication in the first message for instructing the terminal to send a feedback message to the wireless communication node includes any one of the following items: a Channel State Information (CSI) request field, a Cyclic Redundancy Check (CRC) scrambled with a first Radio Network Temporary Identifier (RNTI), a Physical Uplink Control Channel (PUCCH) resource indicator field, a new data indicator field, a redundancy version field, and a priority indicator field.

[0034] 26. The technical solution according to Clause 23, wherein the information concerning the channel state includes a second type of channel state information, which is measured based on any one of the following: Physical Downlink Shared Channel (PDSCH), Periodic Channel State Information Reference Signal (CSI-RS) resources, and Semi-Persistent Channel State Information Reference Signal (CSI-RS) resources.

[0035] 27. The technical solution according to Clause 23, wherein the indication in the first message for feeding back information about the channel state includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state of triggering the first type of channel state information, and a field in the first message indicating the state of triggering the second type of channel state information.

[0036] 28. The technical solution according to Clause 23, wherein the first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space, a second downlink control information (DCI) for scheduling or activating uplink transmission identified in a user equipment (UE)-specific search space, and a third downlink control information (DCI) identified in a group common search space.

[0037] 29. The technical solution according to Clause 23, wherein the indication for feeding back information about the channel state includes the decoding result of the downlink transmission, the decoding result indicating whether information about the channel state is included in the feedback message.

[0038] 30. The technical solution according to Clause 29, wherein the decoding result is identified by the terminal and the decoding result indicates non-acknowledgment (NACK), indicating that the decoding of the downlink transmission was unsuccessful, and wherein the downlink transmission is a transmission in the Physical Downlink Shared Channel (PDSCH) scheduled or activated by the first message.

[0039] 31. According to the technical solution described in Clause 23, if the first indication field of the first message includes a bit string having any bit read as a non-zero value, then the indication of the first type of trigger state is used to trigger the feedback of the first type of channel state information.

[0040] 32. The technical solution according to Clause 31 further includes: the wireless communication node sending a Radio Resource Control (RRC) message to the terminal, wherein the first type of triggering state is configured by the wireless communication node through the Radio Resource Control (RRC) message.

[0041] 33. According to the technical solution described in Clause 23, if the first indication field of the first message includes a bit string having any bit read as a non-zero value, then the indication of the second type of trigger state indicates the second type of trigger state, wherein the indication of the second type of trigger state triggers the feedback of the second type of channel state information.

[0042] 34. The technical solution according to Clause 33 further includes: the wireless communication node sending a Radio Resource Control (RRC) message to the terminal, wherein the second type of triggering state is configured by the wireless communication node through the Radio Resource Control (RRC) message.

[0043] 35. The technical solution according to Article 23, wherein the indication for instructing the terminal to send a feedback message to the wireless communication node includes a channel state information (CSI) measurement type, wherein the channel state information (CSI) measurement type includes at least one of the following: a first type trigger indicating that a first type of channel state information (CSI) measurement will be performed, and a second type trigger indicating that a second type of channel state information (CSI) measurement will be performed.

[0044] 36. The technical solution according to Clause 23, wherein if a first type of trigger is identified in the first message, the terminal is configured to prepare a first format for information about the channel state, wherein the first format is included in the feedback message.

[0045] 37. The technical solution according to Clause 23, wherein if a second type of trigger is identified in the first message, the terminal prepares a second format for information about the channel state, wherein the second format is included in the feedback message.

[0046] 38. The technical solution according to Article 37, wherein the second format for channel state information (CSI) feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one sub-band of a first frequency domain range, a wideband channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the last value of a previously fed-out channel quality indicator (CQI) indicating the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the value in the first message indicating the first frequency domain range, and at least one difference between the channel quality indicator (CQI) of at least one sub-band and the wideband channel quality indicator (CQI) of the first frequency domain range.

[0047] 39. The technical solution according to Clause 37, wherein the first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via Radio Resource Control (RRC) signaling for downlink transmission scheduled by the first message, frequency resources for downlink transmission activated by the first message, and frequency resources for Physical Downlink Shared Channel (PDSCH) transmission in semi-persistent scheduling (SPS).

[0048] 40. The technical solution according to Clause 23 further includes: the wireless communication node sending an offset to the terminal, the offset indicating a first field to be read in one or more fields in the first message, or indicating that reading starts from a first start bit in one or more fields in the first message.

[0049] 41. The technical solution according to Clause 29, wherein the indication for feeding back information about the channel state includes the decoding result of the downlink transmission after the first repetition.

[0050] 42. The technical solution according to Clause 41, wherein the first repetition count includes at least one of the following: a value equal to 1, a total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling.

[0051] 43. An apparatus for wireless communication, comprising a processor configured to perform any one of the technical solutions described in any one of clauses 1 to 42.

[0052] 44. A non-transitory computer-readable medium having code stored thereon, which, when executed by a processor, causes the processor to perform the technical solutions described in any one of clauses 1 to 42.

[0053] Details of one or more embodiments are set forth in the appended annex, drawings, and the following description. Other features will be apparent from the specification, drawings, and claims. Attached Figure Description

[0054] Figure 1 This is a block diagram of an example signaling procedure used to trigger feedback information.

[0055] Figure 2 This is a block diagram of an example method for triggering the transmission of feedback channel state information.

[0056] Figure 3 An example of a wireless communication system is shown, which can apply techniques according to one or more embodiments of the present technology.

[0057] Figure 4 It is a block diagram representing a part of a hardware platform. Detailed Implementation

[0058] The development of next-generation wireless communication—5G New Radio (NR)—is part of the continuous evolution of mobile broadband to meet the ever-increasing network demands. NR will offer greater throughput to allow more users to connect simultaneously. Other aspects such as power consumption, equipment cost, spectrum efficiency, and latency are also important for meeting the needs of various communication scenarios.

[0059] Many networks require low latency and high reliability in providing wireless communication (e.g., Ultra Reliable Low Latency Communications (URLLC)). In many cases, the terminal (or "user equipment" (UE)) can feed back accurate and timely channel state information to the base station, enabling the base station to perform appropriate link adaptation tasks to ensure that wireless communication meets the requirements of low latency and high reliability.

[0060] In some cases, feedback of aperiodic channel state information can only be triggered by the physical downlink control channel (PDCCH) carrying uplink (UL) grants. Feedback can also be performed on the physical uplink shared channel (PUSCH) scheduled by the UL grant. In these cases, if no UL data needs to be transmitted, the base station must transmit a PDCCH carrying the UL grant to trigger aperiodic channel state feedback. This can lead to PDCCH congestion.

[0061] Therefore, in many cases, it has been proposed that a PDCCH carrying a downlink (DL) license can be used to trigger aperiodic channel state information feedback, and that the DL license can simultaneously schedule the PDSCH. This can trigger aperiodic channel state information feedback. This may occur when the base station needs to schedule the PDSCH and the terminal needs to provide channel state information. In some embodiments, when the base station needs to schedule the PDSCH and requests the terminal to provide channel state information, the DL license can be used to trigger aperiodic channel state information feedback.

[0062] In many cases, some schemes propose that after the terminal decodes the PDSCH transport block (TB) and the result is unsuccessful decoding (i.e., the HARQ-ACK feedback is NACK), the terminal can trigger feedback of aperiodic channel state information, so that the feedback aperiodic channel state information can be applied to the retransmission link adaptation of the PDSCH TB.

[0063] After decoding the PDSCH, the terminal can generate an ACK (acknowledgment) or NACK (non-acknowledgment) for that PDSCH in the HARQ-ACK feedback, and the terminal can carry the HARQ-ACK feedback on the PUCCH and send it back to the base station. For PUCCHs that include HARQ-ACK feedback from multiple PDSCHs, NR can introduce a semi-static HARQ-ACK codebook and a dynamic HARQ-ACK codebook. In some instances, HARQ-ACK feedback can be sent in a specific slot, where the slot is indicated by K1 in the last DCI. The HARQ-ACK feedback can be carried in the PUCCH resource, where the PUCCH resource is indicated by PRI in the last DCI, the offset between the slot of the DCI and the slot of the PUCCH is indicated by K1, and the PUCCH resource index is indicated by PRI.

[0064] For the dynamic HARQ (Hybrid Automatic Repeat-reQuest) codebook method, the base station can carry HARQ-ACK feedback for multiple PDSCHs in a time slot indicated by K1 and PRI in the last DCI. This can be transmitted on PUCCH resources, where K1 can indicate the offset between the time slot of the DCI and the time slot of the PUCCH, and PRI can indicate the PUCCH resource index.

[0065] Triggering aperiodic channel state information (A-CSI) feedback through DL licensing and PDSCH TB decoding results may present specific problems. For example, using the method of this invention, A-CSI feedback can be triggered quickly by the base station independently or with terminal assistance, enabling the base station to obtain updated channel state information as soon as possible for better link adaptation.

[0066] System Overview

[0067] This embodiment relates to triggering a terminal to provide channel state information feedback. Specifically, this embodiment provides a method for triggering accurate and timely channel state information feedback.

[0068] Example 1

[0069] The first scenario may involve how to trigger A-CSI feedback using two trigger types. The terminal is predefined by the system or semi-statically configured by the base station via RRC signaling, as described herein. RRC signaling can support at least one of the two types of A-CSI measurement feedback.

[0070] Type I A-CSI feedback is measured using aperiodic CSI-RS resources, periodic CSI-RS resources, or semi-persistent CSI-RS resources, and the Type I A-CSI feedback is fed back to the base station based on the measurement results. The base station can trigger aperiodic CSI-RS resources simultaneously with triggering Type I A-CSI feedback.

[0071] Figure 1 This is a block diagram of an example signaling procedure 100 used to trigger feedback information. (Example...) Figure 1 As shown, base station 112 (or "wireless communication node") may send a DL grant message 102 (or simply "first message") to terminal 110. The DL grant message 102 may include an indication to trigger the terminal (or "user equipment (UE)") to send feedback information. UE 110 may perform channel state measurement 104 to derive channel measurement information of the channel. For example, this may include deriving A-CSI.

[0072] In some instances, the UE can be triggered to perform channel state measurements in response to the receipt of a DL grant message. In other instances, the UE can perform channel state measurements independently of the receipt of a DL grant message.

[0073] UE 110 can send feedback message 106 to base station 112. Feedback message 106 may include channel state measurements (e.g., A-CSI feedback information).

[0074] In some embodiments, the terminal may determine whether to trigger Type I A-CSI feedback based on the DL permission instruction. If periodic CSI-RS resources or semi-persistent CSI-RS resources are available for CSI measurement, the base station may not trigger aperiodic CSI-RS resources when triggering Type I A-CSI feedback. If no periodic or semi-persistent CSI-RS resources are available for CSI measurement, the base station may trigger aperiodic CSI-RS resources.

[0075] Based on PDSCH, periodic CSI-RS resources, or semi-persistent CSI-RS resources, the second type of A-CSI feedback is measured, and the second type of A-CSI feedback is fed back to the base station according to the measurement results. The base station may not trigger aperiodic CSI-RS resources when triggering the second type of A-CSI feedback.

[0076] The terminal can determine whether to trigger Type II A-CSI feedback based on the DL license instruction and / or the PDSCH decoding result, where the PDSCH is scheduled or activated by the DL license. If the DL license triggers Type II A-CSI feedback, and the terminal decodes the DL-licensed or activated PDSCH as NACK, i.e., the decoding result is unsuccessful, then Type II A-CSI feedback can be triggered.

[0077] Specifically, if periodic CSI-RS resources or semi-persistent CSI-RS resources are used to measure CSI, the terminal can measure CSI based on the periodic CSI-RS resources or semi-persistent CSI-RS resources and provide this information to the base station as Type II Feedback A-CSI. Alternatively, the base station can obtain Type II Feedback A-CSI via PDSCH. Specifically, this PDSCH can be a DL-licensed PDSCH that triggers Type II A-CSI or an active PDSCH.

[0078] The base station can dynamically indicate whether to trigger A-CSI feedback in the DL permission, and can specifically trigger either Type I A-CSI feedback or Type II A-CSI feedback.

[0079] In Method 1, only the CSI request field can be added to the DL license. If the CSI request field includes a bit field where every bit is "0", it can indicate that A-CSI feedback should not be triggered. If the CSI request field includes a bit field where every bit is not "0", it can indicate that A-CSI feedback should be triggered, and whether it is a Type I or Type II A-CSI feedback can be triggered based on the trigger status value indicated by the CSI request field.

[0080] The trigger state value can be within a first range, corresponding to triggering a first type of A-CSI feedback. The trigger state value can be within a second range, corresponding to triggering a second type of A-CSI feedback. The trigger states in the first and second ranges can be semi-statically configured to the terminal by the base station via RRC signaling. For example, the base station can configure an A-CSI type indicator field in the trigger state configuration via RRC signaling, and the A-CSI type indicator field can indicate that the trigger state can trigger either a first type of A-CSI feedback or a second type of A-CSI feedback.

[0081] In Method 2, the DL license includes a CSI request field and a triggering type indication, which can be either 1 or 2 bits. If the CSI request field consists of a string of bits where every bit is "0", it indicates that no A-CSI feedback will be triggered. If the CSI request field consists of a string of bits with non-"0" bits, it indicates that A-CSI feedback will be triggered. The triggering type indication can be used to determine which type of A-CSI feedback will be used for triggering.

[0082] In method 3, the DL license includes a CSI request field and a second type A-CSI trigger indication, which can be 1 or 2 bits. The CSI request field can be used to indicate whether a first type A-CSI feedback is triggered based on the trigger status value. The second type A-CSI trigger indication can indicate whether a second type A-CSI feedback is triggered. For example, if the value of the second type A-CSI trigger indication is "0", it means that no second type trigger is triggered; if the value of the second type A-CSI trigger indication is "1", it means that a second type trigger is triggered, and therefore the second type feedback should be sent by the terminal.

[0083] In method 4, only the CSI request field can be added to the DL license. If the CSI request includes a bit string where all bits are equal to "0", it can indicate that a Type I A-CSI feedback is not triggered and a Type II A-CSI feedback is triggered. If the CQI request includes a bit string with "0" bits that are not "0", it can trigger a Type I A-CSI feedback without triggering a Type II A-CSI feedback.

[0084] Different A-CSI report formats can be predefined by the system or semi-statically configured by the base station through RRC signaling, and different A-CSI report formats can include different channel state information corresponding to the first type of A-CSI feedback and the second type of A-CSI feedback.

[0085] The second type of A-CSI feedback may include any of the following: a channel quality indicator (CQI) for at least one subband of a first frequency domain range, a wideband CQI for the first frequency domain range, at least one difference between the CQI of at least one subband and the last value of the CQI indicating previous feedback in the first frequency domain range, at least one difference between the CQI of at least one subband and the value in the first message indicating the first frequency domain range, and at least one difference between the CQI of at least one subband and the wideband CQI of the first frequency domain range.

[0086] The first frequency range may include any of the following: frequency domain resources occupied by PDSCHs scheduled or activated by a DL license that triggers Type II A-CSI, frequency domain resources predefined by the system or semi-statically configured by the base station, and frequency domain resources of SPS-PDSCHs that can be activated by a DL license or other DL licenses.

[0087] Example 2

[0088] Example embodiment 2 may involve how to trigger A-CSI feedback using a specific RNTI. The system may predefine the RNTI, or the base station may semi-statically configure the RNTI, which may be referred to as the first RNTI.

[0089] When the UE receives a DL grant or UL grant in a DCI with a CRC scrambled by the first RNTI, the UE can trigger an A-CSI feedback, which is then sent in the PUCCH or PUSCH. When the UE receives a DL grant or UL grant in a DCI with a CRC scrambled by another RNTI, no A-CSI feedback may be triggered.

[0090] Example 3

[0091] Example 3 may involve how to use a specific PRI to trigger A-CSI feedback.

[0092] PUCCH resources can be divided into first PUCCH resources and second PUCCH resources. The system predefines or the base station semi-statically configures some PUCCH resources as first PUCCH resources, and the system predefines or the base station semi-statically configures some other PUCCH resources as second PUCCH resources.

[0093] After receiving a DL grant, the terminal can read the PUCCH resource indicator field in the DL grant. If the PUCCH resource indicated by this field is the first PUCCH resource, the terminal can instruct the DL grant to trigger A-CSI feedback. If the PUCCH resource indicated by this field is the second PUCCH resource, the terminal can instruct the DL grant not to trigger A-CSI feedback.

[0094] If the terminal confirms that the DL permission triggers A-CSI feedback through the PUCCH Resource Indication field, the terminal can send A-CSI feedback on the PUCCH resource indicated by the PUCCH Resource Indication field. Specifically, the terminal can multiplex A-CSI and HARQACK on the PUCCH resource and send the feedback to the base station.

[0095] If the base station configures the terminal to feed back HARQ-ACK based on a HARQ-ACK codebook, the terminal can send A-CSI on the PUCCH resource indicated by the PUCCH resource indicator field of the last DCI.

[0096] The HARQ-ACK codebook may include one or more HARQ-ACKs for one or more PDSCH transmissions, where the last DCI is the DL grant that schedules or activates the last PDSCH transmission. If the terminal confirms via the PUCCH resource indicator field that the DL grant did not trigger A-CSI feedback, the terminal may send HARQ-ACK feedback only on the PUCCH resource indicated by the PUCCH resource indicator field. Here, the DL grant may be the last DCI or a DCI received by the terminal before the last DCI.

[0097] Example 4

[0098] Example embodiment 4 may relate to how to use fields in a DL license to trigger A-CSI feedback. After receiving a DL license for scheduling PDSCH, the terminal can determine whether the base station has triggered A-CSI feedback based on the system's predefined or semi-static configuration of the base station and the values ​​of one or more of the following fields in the DL license. Examples of the aforementioned fields in the DL license may include: a New data indicator field in the DL license, a Redundancy version field in the DL license, or a Priority indicator field in the DL license.

[0099] Specifically, the terminal can determine whether the current DL permission should trigger A-CSI feedback based on the indication that the current DL permission triggers A-CSI feedback according to the NDI field (triggered by whether the NDI field is inverted). Specifically, if the NDI field is not inverted, it indicates that the current DL permission should trigger A-CSI feedback. If the RV field indicates a specific value, it means that the current DL permission can trigger A-CSI feedback; this specific value is predefined by the system or configured by the base station to the terminal via RRC signaling.

[0100] If the priority indicator field indicates a specific value, it can indicate that the current DL permission can trigger A-CSI feedback. This specific value can be predefined by the system or configured by the base station to the terminal via RRC signaling. Specifically, if the priority indicator field indicates high priority, it can indicate that the current DL permission triggers A-CSI feedback. If the terminal determines that the DL permission triggers A-CSI feedback in the above manner, the terminal can provide A-CSI feedback on the PUCCH or PUSCH.

[0101] Example 5

[0102] Example embodiment 5 may involve how to use a group-common PDCCH to trigger A-CSI feedback. The base station can use the group-common PDCCH DCI to instruct the terminal to trigger A-CSI feedback. Specifically, the indication to trigger A-CSI feedback is transmitted using one of DCI formats 2_0, 2_1, 2_2, 2_3, or 2_4, which can be predefined by the system, or a new DCI format can be predefined to indicate the triggering of A-CSI feedback.

[0103] In the group common PDCCH DCI that triggers A-CSI feedback, multiple A-CSI trigger fields can be included, and each A-CSI trigger field can indicate the A-CSI trigger for a specific user or user group. For each user or user group, the field offset or bit offset can be semi-statically configured by the base station via RRC signaling. The field offset indicates which field the user or user group reads. The bit offset indicates which bit the user or user group reads from.

[0104] Example 6

[0105] Example 6 may involve how to trigger A-CSI feedback using DL grant and NACK. The base station can configure the terminal via RRC signaling to perform repeated transmissions of PDSCH with a repetition factor of K. Specifically, for a PDSCH scheduled by a DL grant or a PDSCH of an SPS activated by a DL grant, the PDSCH may be transmitted K times consecutively over one or more time units, which can be a time slot, a sub-time slot, or several OFDM symbols.

[0106] Whether or not A-CSI feedback is triggered is based on the decoding result of PDSCH transmission, and the base station can configure the repetition factor of PDSCH transmission to K. After receiving the first number of repetitions, if the decoding result is unsuccessful, that is, the feedback of PDSCH transmission is NACK, then A-CSI feedback is triggered. The determination of the first value can be predefined by the base station or indicated by DCI, or configured by the base station through MAC CE, or configured by the base station through RRC signaling.

[0107] Method 1 may include the terminal determining whether to trigger A-CSI feedback based on the first transmission in K repeated transmissions. Specifically, the terminal may receive the first transmission in K repeated transmissions and determine that the decoding result is NACK, thereby triggering A-CSI feedback, and the terminal may send A-CSI feedback.

[0108] After receiving all transmissions through K repeated transmissions, the terminal can determine whether to trigger A-CSI feedback based on the final decoding result. Specifically, if the terminal determines that the final decoding result after N repeated transmissions is NACK, the terminal can consider A-CSI to have been triggered. The terminal can then perform A-CSI feedback.

[0109] The base station can instruct the terminal via RRC signaling, MAC CE, or DCI to determine whether to trigger A-CSI feedback based on the decoding result after the first m repeated transmissions. m is any integer between 1 and K. Specifically, if the terminal determines that the decoding result after m repeated transmissions is NACK, the terminal can determine that A-CSI feedback has been triggered, and the terminal can perform A-CSI feedback.

[0110] Specifically, if some of the K repeated transmissions are not received, the terminal can determine that A-CSI feedback has been triggered, and the terminal can choose not to receive the remaining repeated transmissions.

[0111] Therefore, if the terminal determines whether to trigger A-CSI feedback based on the first transmission in K repeated transmissions, the terminal can consider the time unit in which the first transmission was received or the time unit in which the DL permission was received as the time unit in which A-CSI feedback was triggered. This time unit may include a time slot, a sub-time slot, or an OFDM symbol. If the time unit is an OFDM symbol, it may specifically refer to the end symbol of the terminal receiving the first transmission or the end symbol of the terminal receiving the DL permission.

[0112] If the terminal determines whether to trigger A-CSI feedback based on all transmissions in the K repeated transmissions, the terminal can determine that the time unit in which the Kth transmission is received, or the time unit in which the DL permission is received, is the time unit in which A-CSI feedback is triggered. This time unit can be a time slot, a sub-time slot, or an OFDM symbol. If the time unit is an OFDM symbol, it can specifically refer to the end symbol of the terminal receiving the first transmission or the end symbol of the terminal receiving the DL permission.

[0113] If the terminal determines whether to trigger A-CSI feedback based on the first m transmissions out of K repeated transmissions, the terminal can determine that the time unit in which the m-th transmission is received, or the time unit in which the DL permission is received, is the time unit in which A-CSI feedback is triggered. This time unit may include a time slot, a sub-time slot, or an OFDM symbol. If the time unit is an OFDM symbol, it may specifically refer to the end symbol of the terminal receiving the first transmission or the end symbol of the terminal receiving the DL permission.

[0114] Figure 2 This is a block diagram of an example method 200 for triggering the transmission of feedback channel state information. The method may include receiving a first message from a wireless communication node (block 202). The first message may include a DL permission message, such as a reference... Figure 1 The described DL license message 102.

[0115] The method may also include performing measurements related to the channel state (block 204). This may include performing A-CSI feedback measurements as described herein. The measurements related to the channel state may be performed before or in response to the transmission of the first message.

[0116] The method may further include a terminal sending a feedback message to a wireless communication node, based on determining that a first message includes an indication for feeding back measurements related to the channel state (block 206). This feedback message may include A-CSI measurement feedback information fed back to a base station.

[0117] In some embodiments, the information about the channel state includes a first type of channel state information based on Channel State Information Reference Signal (CSI-RS) resource measurements.

[0118] In some embodiments, the indication in the first message for feeding back information about the channel state includes any one of the following: a channel state information (CSI) request field, a cyclic redundancy check (CRC) scrambled with a first Radio Network Temporary Identifier (RNTI), a physical uplink control channel (PUCCH) resource indicator field, a new data indicator field, a redundancy version field, and a priority indicator field.

[0119] In some embodiments, information about the channel state includes a second type of channel state information feedback, which is based on any one of the following measurements: physical downlink shared channel (PDSCH), periodic channel state information reference signal (CSI-RS) resources, and semi-persistent CSI-RS resources.

[0120] In some embodiments, the indication in the first message for providing information about the channel state includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state of information that triggers a first type of channel state, and a field in the first message indicating the state of information that triggers a second type of channel state.

[0121] In some embodiments, the first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space, a second DCI for scheduling or activating uplink transmission identified in a UE-specific search space, and a third DCI identified in a group common search space.

[0122] In some embodiments, the method includes a terminal determining whether a first message includes an indication for triggering either a first type of channel state information or a second type of channel state information.

[0123] In some embodiments, the indication for feeding back information about the channel state includes the decoding result of the downlink transmission, which indicates whether information about the channel state is included in the feedback message.

[0124] In some embodiments, the decoding result determined by the terminal indicates a negative acknowledgement (NACK), which indicates that the decoding of the downlink transmission was unsuccessful, and wherein the downlink transmission is a transmission scheduled or activated in a PDSCH by the first message.

[0125] In some embodiments, the method includes determining by the terminal that a first indication field of a first message includes a bit string having bits read as non-zero values, wherein the first indication field having a bit string having bits read as non-zero values ​​indicates a first type of trigger state, wherein the indication of the first type of trigger state is used to trigger feedback of a first type of channel state information.

[0126] In some embodiments, the method includes a terminal receiving a Radio Resource Control (RRC) message from a wireless communication node, wherein a first type of triggering state is configured by the wireless communication node via the RRC message.

[0127] In some embodiments, the method includes the terminal determining that a first indication field of a first message includes a bit string having any bits read as non-zero values, wherein the first indication field having a bit string having any bits read as non-zero values ​​indicates a second type of trigger state, wherein the indication of the second type of trigger state is used to trigger feedback of second type of channel state information.

[0128] In some embodiments, the method includes the terminal receiving an RRC message from a wireless communication node, wherein the second type of trigger state is configured by the wireless communication node via the RRC message.

[0129] In some embodiments, the indication of feedback information about the channel state includes identifying the CSI measurement type, wherein the CSI measurement type includes at least one of the following: a first trigger indicating that a first type of CSI measurement will be performed, and a second trigger indicating that a second type of CSI measurement will be performed.

[0130] In some embodiments, if a first type of trigger is identified in the first message, the terminal prepares a first format for information about the channel state, which is included in the feedback message.

[0131] In some embodiments, if a second type of trigger is identified in the first message, the terminal prepares a second format for information about the channel state, wherein the second format is included in the feedback message.

[0132] In some embodiments, the second format for CSI feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one subband of a first frequency domain range, a wideband CQI for the first frequency domain range, at least one difference between the CQI of at least one subband and the last value of the CQI indicating previous feedback in the first frequency domain range, at least one difference between the CQI of at least one subband and the value in the first message indicating the first frequency domain range, and at least one difference between the CQI of at least one subband and the wideband CQI of the first frequency domain range.

[0133] In some embodiments, the first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via RRC signaling for downlink transmissions scheduled by the first message, frequency resources for downlink transmissions activated by the first message, and frequency resources for physical downlink shared channel (PDSCH) transmissions in semi-persistent scheduling (SPS).

[0134] In some embodiments, determining that the first message includes an indication for providing feedback information about the channel state includes identifying one or more fields in the first message for triggering feedback messages for one or more groups of terminals.

[0135] In some embodiments, the method includes receiving an offset from a wireless communication node by a terminal, the offset indicating a first field to be read in one or more fields of a first message, or indicating that reading begins from a first start bit in one or more fields of a first message.

[0136] In some embodiments, the indication of feedback information about the channel state includes the decoding result of the downlink transmission after a first repetition.

[0137] In some embodiments, the first number of repetitions includes at least one of the following: a value equal to 1, a total number of repetitions configured by the wireless communication node via RRC signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via RRC signaling.

[0138] In another example embodiment, a method for wireless communication includes: sending a first message from a wireless communication node to a terminal, the first message including at least one indication for instructing the terminal to send a feedback message to the wireless communication node; and receiving a feedback message from the terminal by the wireless communication node in response to the sending of the first message, the feedback message including information about channel status.

[0139] In some embodiments, information about the channel state includes a first type of channel state information based on Channel State Information Reference Signal (CSI-RS) resource measurements.

[0140] In some embodiments, the indication in the first message for instructing the terminal to send a feedback message to the wireless communication node includes any one of the following items: a Channel State Information (CSI) request field, a Cyclic Redundancy Check (CRC) scrambled with a first Radio Network Temporary Identifier (RNTI), a Physical Uplink Control Channel (PUCCH) resource indicator field, a new data indicator field, a redundancy version field, and a priority indicator field.

[0141] In some embodiments, information about the channel state includes a second type of channel state information feedback, which is based on any one of the measurements of the Physical Downlink Shared Channel (PDSCH), the Periodic Channel State Information Reference Signal (CSI-RS) resource, and the Semi-Persistent CSI-RS resource.

[0142] In some embodiments, the indication in the first message for providing information about the channel state includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state that triggers a first type of channel state information, and a field in the first message indicating the state that triggers a second type of channel state information.

[0143] In some embodiments, the first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space, a second DCI for scheduling or activating uplink transmission identified in a UE-specific search space, and a third DCI identified in a group common search space.

[0144] In some embodiments, the indication for feeding back information about the channel state includes the decoding result of the downlink transmission, which indicates whether information about the channel state is included in the feedback message.

[0145] In some embodiments, the decoding result determined by the terminal indicates a non-acknowledgment (NACK), which indicates that the decoding of the downlink transmission was unsuccessful, and wherein the downlink transmission is a transmission scheduled or activated in a PDSCH by the first message.

[0146] In some embodiments, the first indication field of the first message includes a bit string with bits read as non-zero values, the bit string with bits read as non-zero values ​​indicating a first type of trigger state, wherein the indication of the first type of trigger state is used to trigger feedback of the first type of channel state information.

[0147] In some embodiments, the method includes sending a Radio Resource Control (RRC) message from a wireless communication node to a terminal, wherein a first type of triggering state is configured by the wireless communication node via the RRC message.

[0148] In some embodiments, the first indication field of the first message includes a bit string with bits read as non-zero values, the bit string with bits read as non-zero values ​​indicating a second type of trigger state, wherein the indication of the second type of trigger state is used to trigger feedback of second type of channel state information.

[0149] In some embodiments, the method includes sending an RRC message from a wireless communication node to a terminal, wherein a second type of triggering state is configured by the wireless communication node via the RRC message.

[0150] In some embodiments, the indication for instructing a terminal to send a feedback message to a wireless communication node includes a CSI measurement type, wherein the CSI measurement type includes at least one of the following: a first trigger indicating that a first type of CSI measurement will be performed, and a second trigger indicating that a second type of CSI measurement will be performed.

[0151] In some embodiments, if a first type of trigger is identified in a first message, the terminal is configured to prepare a first format for information about the channel state, wherein the first format is included in a feedback message.

[0152] In some embodiments, if a second type of trigger is identified in the first message, the terminal prepares a second format for information about the channel state, wherein the second format is included in the feedback message.

[0153] In some embodiments, the second format for CSI feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one subband of a first frequency domain range, a wideband CQI for the first frequency domain range, at least one difference between the CQI of at least one subband and the last value of the CQI indicating previous feedback in the first frequency domain range, at least one difference between the CQI of at least one subband and the value in the first message indicating the first frequency domain range, and at least one difference between the CQI of at least one subband and the wideband CQI of the first frequency domain range.

[0154] In some embodiments, the first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via RRC signaling for downlink transmissions scheduled by the first message, frequency resources for downlink transmissions activated by the first message, and frequency resources for physical downlink shared channel (PDSCH) transmissions in semi-persistent scheduling (SPS).

[0155] In some embodiments, the method includes sending an offset from a wireless communication node to a terminal, the offset indicating a first field to be read in one or more fields of a first message, or indicating that reading begins from a first start bit in one or more fields of a first message.

[0156] In some embodiments, the indication of feedback information about the channel state includes the decoding result of the downlink transmission after a first repetition.

[0157] In some embodiments, the first number of repetitions includes at least one of the following: a value equal to 1, a total number of repetitions configured by the wireless communication node via RRC signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via RRC signaling.

[0158] Example wireless system

[0159] Figure 3 An example of a wireless communication system is shown, which applies the technology according to one or more embodiments of the present invention. The wireless communication system 300 may include one or more base stations (BS) 305a, 305b, one or more wireless devices 310a, 310b, 310c, 310d, and a core network 325. Base stations 305a, 305b may provide wireless services to wireless devices 310a, 310b, 310c, and 310d in one or more wireless sectors. In some embodiments, base stations 305a, 305b include directional antennas for generating two or more directional beams to provide wireless coverage in different sectors.

[0160] The core network 325 can communicate with one or more base stations 305a and 305b. The core network 325 provides connectivity with other wireless and wired communication systems. The core network may include one or more service subscription databases to store information related to wireless devices 310a, 310b, 310c, and 310d that have subscribed to services. The first base station 305a can provide wireless services based on a first radio access technology, while the second base station 305b can provide wireless services based on a second radio access technology. Depending on the deployment scenario, base stations 305a and 305b can be located in the same location or can be installed separately in the field. Wireless devices 310a, 310b, 310c, and 310d can support multiple different wireless access technologies.

[0161] In some implementations, a wireless communication system may include multiple networks using different wireless technologies. Dual-mode or multi-mode wireless devices include two or more wireless technologies that can be used to connect to different wireless networks.

[0162] Figure 4 This is a block diagram representing a portion of a hardware platform. Hardware platform 405, such as a network device, base station, or wireless device (or UE), may include processor electronics 410, such as a microprocessor implementing one or more technologies presented in this document. Hardware platform 405 may include transceiver electronics 415 for transmitting and / or receiving wired or wireless signals via one or more communication interfaces (e.g., antenna 420 or a wired interface). Hardware platform 405 may implement other communication interfaces using protocols defined for transmitting and receiving data. Hardware platform 405 may include one or more memories (not explicitly shown) configured to store information (e.g., data and / or instructions). In some embodiments, processor electronics 410 may include at least a portion of transceiver electronics 415. In some embodiments, at least some of the disclosed technologies, modules, or functions are implemented using hardware platform 405.

[0163] in conclusion

[0164] Based on the foregoing description, it should be understood that specific embodiments of the currently disclosed technology have been described for illustrative purposes, but various modifications may be made without departing from the scope of the invention. Therefore, the technology disclosed herein is not limited except for the appended claims.

[0165] The embodiments, modules, and functional operations disclosed in this document can be implemented in digital electronic circuits, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations thereof. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer-readable medium for execution by or control of the operation of a data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a combination of substances that implement machine-readable propagating signals, or a combination thereof. The term "data processing apparatus" includes all devices, apparatuses, and machines for processing data, including, for example, a programmable processor, a computer, or multiple processors or computers. In addition to hardware, the apparatus may include code that creates an execution environment for the computer program in question, for example, code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination thereof. Propagating signals are artificially generated signals, such as machine-generated electrical, optical, or electromagnetic signals, which are generated to encode information for transmission to a suitable receiver device.

[0166] Computer programs (also known as programs, software applications, scripts, or code) can be written in any programming language, including compiled or interpreted languages, and can be deployed in any form, including as standalone programs or as modules, components, subroutines, or other units suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored as a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), as a single file dedicated to the program in question, or as multiple co-located files (e.g., a file storing one or more modules, subroutines, or code sections). A computer program can be deployed to execute on a single computer, or on multiple computers located in one location or distributed across multiple locations and interconnected by a communication network.

[0167] The processes and logic flows described in this document can be executed by one or more programmable processors, which execute one or more computer programs to perform functions by manipulating input data and generating output. These processes and logic flows can also be executed by special-purpose logic circuitry, and the devices can be implemented as special-purpose logic circuitry, such as FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits).

[0168] Processors suitable for executing computer programs include, for example, general-purpose and special-purpose microprocessors, and any one or more processors of any type of digital computer. Typically, a processor receives instructions and data from read-only memory or random access memory, or both. The basic components of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Typically, a computer will also include one or more mass storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, or operatively coupled to one or more mass storage devices for storing data to receive data from or transfer data to them, or both. However, a computer does not need to have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, including, for example, semiconductor memory devices such as EPROM, EEPROM, and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD-ROMs and DVD-ROMs. The processor and memory may be supplemented by or incorporated into special-purpose logic circuitry.

[0169] While this patent document contains numerous details, these details should not be construed as limiting the scope of any invention or the scope that may be claimed, but rather as descriptions of features that may be specific to particular embodiments of a particular invention. Certain features described in the context of individual embodiments in this patent document may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although features may be described above as operating in certain combinations, and even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and the claimed combination may be for sub-combinations or variations thereof.

[0170] Similarly, although operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring such operations to be performed in the specific order shown or in a sequential order, or requiring all shown operations to achieve the desired result. Furthermore, the separation of various system components in the embodiments described in this patent document should not be construed as requiring such separation in all embodiments.

[0171] Only some implementation methods and examples are described, and other implementation methods, improvements and variations may be performed based on what is described and shown in this patent document.

Claims

1. A method for wireless communication, comprising: The terminal receives the first message from the wireless communication node; The terminal performs measurements related to the channel state; as well as The terminal, based on determining that the first message includes at least one indication, sends a feedback message to the wireless communication node, wherein the at least one indication is used to instruct the terminal to provide feedback on the measurement of the channel state performed according to a first trigger type or a second trigger type, and the feedback message includes information about the channel state; The information concerning channel state includes, but is not limited to, a first type of channel state information measured based on any one of aperiodic channel state information reference signal (CSI-RS) resources, periodic CSI-RS resources, or semi-persistent CSI-RS resources; or a second type of channel state information measured based on any one of physical downlink shared channel (PDSCH), periodic CSI-RS resources, or semi-persistent CSI-RS resources. Either the first type of channel state information or the second type of channel state information corresponds to the first trigger type or the second trigger type in the first message. Wherein, the at least one indication of the measurement of the channel state fed back according to the second trigger type includes the decoding result of the downlink transmission, the decoding result indicating whether the information about the channel state is included in the feedback message, wherein the decoding result is a negative acknowledgment (NACK) indicating that the downlink transmission decoding was unsuccessful, and wherein the downlink transmission is a transmission in the PDSCH scheduled or activated by the first message.

2. The method according to claim 1, wherein, The at least one indication in the first message includes at least one of the following items: a Channel State Information (CSI) Request field, a Cyclic Redundancy Check (CRC) scrambled by a first Radio Network Temporary Identifier (RNTI), a Physical Uplink Control Channel (PUCCH) Resource Indicator field, a New Data Indicator field, a Redundancy Version field, and a Priority Indicator field.

3. The method according to claim 1, wherein, The at least one indication in the first message includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state of triggering the first type of channel state information, and a field in the first message indicating the state of triggering the second type of channel state information.

4. The method according to claim 1, wherein, The first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space; a second downlink control information (DCI) for scheduling or activating uplink transmission identified in a user equipment (UE)-specific search space; and a third downlink control information (DCI) identified in a group common search space.

5. The method according to claim 1, further comprising: The terminal determines whether the first message includes an indication for triggering a first type of channel state information or a second type of channel state information.

6. The method according to claim 1, further comprising: If the terminal determines that the first indication field of the first message includes a bit string with any bit that is read as a non-zero value, and the first indication field contains a bit string with any bit that is read as a non-zero value, then it indicates a first trigger type, which is used to trigger feedback of a first type of channel state information.

7. The method according to claim 6, further comprising: The terminal receives a Radio Resource Control (RRC) message from the wireless communication node, wherein the first trigger type is configured by the wireless communication node via the RRC message.

8. The method according to claim 1, further comprising: If the terminal determines that the first indication field of the first message includes a bit string with any bits that are read as non-zero, and the first indication field has any bits that are read as non-zero, then it indicates a second trigger type, wherein the first indication field indicates the second trigger type, and the second trigger type is used to trigger a second type of channel state information.

9. The method according to claim 8, further comprising: The terminal receives a Radio Resource Control (RRC) message from the wireless communication node, wherein the second trigger type is configured by the wireless communication node through the RRC message.

10. The method according to claim 1, wherein, The at least one indication in the first message includes identifying a Channel State Information (CSI) measurement type, wherein the CSI measurement type includes at least one of the following: a first trigger type indicating that a first type of CSI measurement will be performed, and a second trigger type indicating that a second type of CSI measurement will be performed.

11. The method according to claim 1, wherein, If a first trigger type is identified in the first message, the terminal prepares a first format for the information about the channel state, and the first format is included in the feedback message.

12. The method according to claim 1, wherein, If a second trigger type is identified in the first message, the terminal prepares a second format for the information about the channel state, wherein the second format is included in the feedback message.

13. The method according to claim 12, wherein, The second format for channel state information (CSI) feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one sub-band of a first frequency domain range, a wideband channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the last value of the channel quality indicator (CQI) indicating the previously fed-out channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the value in the first message indicating the first frequency domain range, and at least one difference between the channel quality indicator (CQI) of at least one sub-band and the wideband channel quality indicator (CQI) for the first frequency domain range.

14. The method according to claim 13, wherein, The first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via Radio Resource Control (RRC) signaling for downlink transmissions scheduled or activated by the first message, and frequency resources for Physical Downlink Shared Channel (PDSCH) transmissions for Semi-Persistent Scheduling (SPS).

15. The method according to claim 1, wherein, Determining that the first message includes the at least one indication includes: identifying one or more fields in the first message for triggering the feedback message for one or more groups of terminals.

16. The method according to claim 1, further comprising: The terminal receives an offset from the wireless communication node, the offset indicating the first field to be read in one or more fields of the first message, or indicating that reading should begin from a first start bit in one or more fields of the first message.

17. The method according to claim 1, wherein, The at least one indication includes the decoding result of the downlink transmission after the first repetition.

18. The method according to claim 17, wherein, The first number of repetitions includes at least one of the following: a value equal to 1, the total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via RRC signaling.

19. A method for wireless communication, comprising: A terminal is configured by a wireless communication node via one of a first trigger type or a second trigger type for feeding back channel state information. Configuring the terminal via the second trigger type includes: configuring the terminal to feed back the channel state information based on a negative acknowledgment (NACK) of a downlink transmission decoding result, the NACK indicating that the downlink transmission decoding was unsuccessful. The downlink transmission is a transmission in a Physical Downlink Shared Channel (PDSCH) scheduled or activated by a first message, the first message including at least one indication for instructing the terminal to feed back measurements related to the channel state, the measurements being performed according to one of the first trigger type or the second trigger type configured for the terminal. The first message is sent from the wireless communication node to the terminal; and The wireless communication node receives a feedback message from the terminal based on the first message, the feedback message including information about the channel state; The information concerning channel state includes, but is not limited to, a first type of channel state information measured based on any one of aperiodic channel state information reference signal (CSI-RS) resources, periodic CSI-RS resources, or semi-persistent CSI-RS resources; or a second type of channel state information measured based on any one of physical downlink shared channel (PDSCH), periodic CSI-RS resources, or semi-persistent CSI-RS resources. Either the first type of channel state information or the second type of channel state information corresponds to the first trigger type or the second trigger type in the first message.

20. The method according to claim 19, wherein, The at least one indication in the first message includes any one of the following items: Channel State Information (CSI) Request field, Cyclic Redundancy Check (CRC) scrambled by the first Radio Network Temporary Identifier (RNTI), Physical Uplink Control Channel (PUCCH) Resource Indicator field, New Data Indicator field, Redundancy Version field, and Priority Indicator field.

21. The method according to claim 19, wherein, The at least one indication in the first message includes any one of the following: a field in the first message indicating the trigger type, a field in the first message indicating the state of triggering the first type of channel state information, and a field in the first message indicating the state of triggering the second type of channel state information.

22. The method according to claim 19, wherein, The first message includes at least one of the following: a first downlink control information (DCI) for scheduling or activating downlink transmission identified in a user equipment (UE)-specific search space; a second downlink control information (DCI) for scheduling or activating uplink transmission identified in a user equipment (UE)-specific search space; and a third downlink control information (DCI) identified in a group common search space.

23. The method according to claim 19, wherein, If the first indication field of the first message includes a bit string with any bits that are read as non-zero, then the first indication field indicates the first trigger type, wherein the first trigger type is used to trigger feedback of the first type of channel state information.

24. The method of claim 19, further comprising: The wireless communication node sends a Radio Resource Control (RRC) message to the terminal, wherein the first trigger type is configured by the wireless communication node through the RRC message.

25. The method according to claim 19, wherein, If the first indication field of the first message includes a bit string with any bits that read as non-zero, then the second trigger type is indicated, wherein the first indication field indicates the second trigger type, which is used to trigger feedback of the second type of channel state information.

26. The method of claim 25, further comprising: The wireless communication node sends a Radio Resource Control (RRC) message to the terminal, wherein the second trigger type is configured by the wireless communication node through the RRC message.

27. The method of claim 19, wherein the at least one indication in the first message includes a Channel State Information (CSI) measurement type, wherein the CSI measurement type includes at least one of the following: a first trigger type indicating that a first type of CSI measurement of a first type is to be performed, and a second trigger type indicating that a second type of CSI measurement of a second type is to be performed.

28. The method according to claim 19, wherein, If a first trigger type is identified in the first message, the terminal is configured to prepare a first format for the information about the channel state, wherein the first format is included in the feedback message.

29. The method according to claim 19, wherein, If a second trigger type is identified in the first message, the terminal prepares a second format for the information about the channel state, wherein the second format is included in the feedback message.

30. The method according to claim 29, wherein, The second format for channel state information (CSI) feedback includes at least one of the following items: a channel quality indicator (CQI) for at least one sub-band of a first frequency domain range, a wideband channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the last value of the channel quality indicator (CQI) indicating the previously fed-out channel quality indicator (CQI) for the first frequency domain range, at least one difference between the channel quality indicator (CQI) of at least one sub-band and the value in the first message indicating the first frequency domain range, and at least one difference between the channel quality indicator (CQI) of at least one sub-band and the wideband channel quality indicator (CQI) for the first frequency domain range.

31. The method according to claim 30, wherein, The first frequency domain range is determined by at least one of the following: predefined frequency resources configured by the wireless communication node via Radio Resource Control (RRC) signaling for downlink transmissions scheduled by the first message, frequency resources for downlink transmissions activated by the first message, and frequency resources for Physical Downlink Shared Channel (PDSCH) transmissions in Semi-Persistent Scheduling (SPS).

32. The method of claim 19, further comprising: The wireless communication node sends an offset to the terminal, the offset indicating the first field to be read in one or more fields in the first message, or indicating that reading should begin from the first start bit in one or more fields in the first message.

33. The method according to claim 19, wherein, The at least one indication in the first message includes the decoding result of the downlink transmission after the first repetition.

34. The method according to claim 33, wherein, The first number of repetitions includes at least one of the following: a value equal to 1, a total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling, and a value ranging from 1 to the total number of repetitions configured by the wireless communication node via Radio Resource Control (RRC) signaling.

35. An apparatus for wireless communication, comprising a processor configured to perform the method according to any one of claims 1 to 34.

36. A non-transitory computer-readable medium having code stored thereon, which, when executed by a processor, causes the processor to perform the method according to any one of claims 1 to 34.

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