CN116803029A

CN116803029A - Feedback information transmission method and device

Info

Publication number: CN116803029A
Application number: CN202180089774.4A
Authority: CN
Inventors: 高飞; 焦淑蓉; 孙宇佳; 花梦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2023-09-22
Also published as: WO2022151099A1

Abstract

The embodiment of the application provides a feedback information transmission method and device, relates to the field of communication, and can improve decoding success rate and spectrum utilization rate. The method comprises the following steps: the terminal equipment receives a PDSCH from the network equipment; the terminal equipment sends feedback information to the network equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information; wherein, the first information is related to an average value of LDPC decoding iteration times corresponding to the first CB; or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, wherein the first adjustment amount comprises an SNR adjustment amount, an SINR adjustment amount, a CQI adjustment amount or an MCS adjustment amount; the first adjustment amount is determined based on the first information. The embodiment of the application is applied to 5G.

Description

Feedback information transmission method and device

Technical Field

The present application relates to the field of communications, and in particular, to a feedback information transmission method and apparatus.

Background

Currently, a New Radio (NR) system uses an adaptive modulation and coding (adaptive modulation and coding, AMC) scheme in a long term evolution (long term evolution, LTE) system. The core of the AMC scheme is a modulation and coding scheme (modulation coding scheme, MCS) selection scheme based on channel quality indication (channel quality indicator, CQI), i.e., adjusting the MCS according to the CQI. CQI feedback in practical systems is inaccurate and lagging due to CQI errors such as errors in CQI calculation, feedback errors, time-varying nature of the channel, and time delay between the moment of CQI calculation and the moment of MCS application. To combat CQI errors, the success rate of the first transmission (first transmission) may be stabilized based on outer loop link adaptation (outer loop link adaptation, OLLA), reducing the performance penalty caused by CQI errors. As shown in fig. 1, the main principle of OLLA is: and performing CQI adjustment according to the HARQ feedback result of the first transmission of the data packet of each User Equipment (UE). The HARQ feedback result includes Acknowledgement (ACK)/negative acknowledgement (negative acknowledge, NACK), among others. If the feedback of the first transmission is ACK, OLLA offset (offset) may be raised and SINR used to determine CQI is raised slightly, thereby raising MCS at the next transmission. Conversely, if the feedback of the first transmission is NACK, OLLA offset may be reduced and the SINR used to determine CQI is slightly reduced, thereby reducing the MCS at the next transmission. The OLLA offset reflects the estimation of the wireless channel environment between the current base station and the UE, i.e. the estimation result after the UE receives the measurement pilot frequency. A bias delta may be used between the base station and 1 UE _OLLA The initial value of the bias is set to delta _init . The delta can be updated when the base station receives the feedback of the first transmission of one HARQ process sent by the UE _OLLA . For example, when the base station receives the feedback of the first transmission of the UE as ACK, the delta can be reduced _OLLA Value, delta _OLLA ＝Δ _OLLA -Δ _ACK The method comprises the steps of carrying out a first treatment on the surface of the If the base station receives the feedback of the first transmission of the UE as NACK, delta can be increased _OLLA Value, delta _OLLA ＝Δ _OLLA +Δ _NACK . Wherein delta is _ACK Delta is the same as the adjustment amount of OLLA corresponding to ACK _NACK For the OLLA adjustment amount, delta corresponding to NACK _ACK And delta _NACK The relationship between the following is shown as follows:

wherein BLER is the target block error rate. Assuming that the target block error rate of the downlink transmission in NR is 10%, Δ _ACK And delta _NACK Is delta in relation to _NACK ＝9·Δ _ACK 。

However, in a scenario requiring high latency and reliability, such as an ultra-reliable and low-latency communication (URLLC) scenario, the OLLA framework is not suitable enough, resulting in low decoding success rate and spectrum utilization.

Disclosure of Invention

The embodiment of the application provides a feedback information transmission method and a feedback information transmission device, which can improve the decoding success rate and the frequency spectrum utilization rate.

In a first aspect, an embodiment of the present application provides a feedback information transmission method, including: the terminal device receives a downlink physical shared channel (physical downlink shared channel, PDSCH) from the network device; the terminal equipment sends feedback information to the network equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information; wherein the first information is related to an average value of a number of decoding iterations of a low density parity check code (low density parity check code, LDPC) corresponding to a first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used to indicate a first adjustment, the first adjustment including a signal-to-noise ratio (signal noise ratio, SNR) adjustment, a signal-to-interference-and-noise ratio (signal to interference noise ratio, SINR) adjustment, a channel quality indication (channel quality indication, CQI) adjustment, or a modulation and coding scheme (modulation coding scheme, MCS) adjustment; the first adjustment amount is determined based on the first information.

Based on the method provided by the embodiment of the application, after the terminal equipment receives the PDSCH, the terminal equipment can send the indication information to the network equipment, and it should be understood that the content of the first indication can reflect the allowance of PDSCH decoding, and OLLA adjustment can be performed according to the allowance of PDSCH decoding. The content indicated by the second information may directly reflect an adjustment amount (e.g., SNR adjustment amount, SINR adjustment amount, CQI adjustment amount, or MCS adjustment amount) related to OLLA adjustment. In this way, different indication information is fed back to the network equipment, so that the network equipment is facilitated to perform OLLA adjustment, accurately track channels or interference and update proper MCS, and the decoding success rate and the spectrum utilization rate of new transmission and retransmission can be improved.

In one possible implementation, the first CB includes all CBs in one Transport Block (TB), or a CB in one TB that decodes correctly, or a CB in one TB that decodes incorrectly; the first CB includes all CBs in a Code Block Group (CBG), or a CB in a CBG that decodes correctly, or a CB in a CBG that decodes incorrectly. That is, the terminal device may feedback the indication information with TB as granularity, or may feedback the indication information with CBG as granularity. The network device can perform OLLA adjustment according to the indication information, accurately track the channel or the interference and update the proper MCS, and can improve the decoding success rate and the spectrum utilization rate of the new transmission and the retransmission.

In one possible implementation manner, the first information is used for indicating an average value of the LDPC decoding iteration numbers corresponding to all CBs in one TB, or a first normalization value determined according to the average value and a preset LDPC decoding iteration number; or the first information is used for indicating the maximum value in the LDPC decoding iteration number corresponding to the CB with correct decoding in one TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration number; or the first information is used for indicating the number of the correct coded CBs in one TB, or a third normalization value determined according to the number of the correct coded CBs and the number of all CBs in one TB; or the first information is used for indicating the number of the decoding-error CBs in one TB, or a fourth normalized value determined according to the number of the decoding-error CBs and the number of all CBs in one TB. That is, the terminal device may feedback the first information with TB as granularity, and the content of the first indication may reflect the remaining amount of PDSCH decoding, so that the network device may perform OLLA adjustment according to the remaining amount of PDSCH decoding.

In one possible implementation manner, the feedback information further includes third information, where the third information includes acknowledgement ACK or negative acknowledgement NACK, and when the third information includes ACK, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, and any one of the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, a second normalized value, the number of CBs that are decoded correctly in one TB, a third normalized value, the number of CBs that are decoded incorrectly in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount. That is, when the third information is different, the same or different first information or second information may be fed back, so that the network device performs OLLA adjustment according to the first information or the second information, accurately tracks the channel or the interference, updates the appropriate MCS, and can improve the decoding success rate and the spectrum utilization rate of the new transmission and the retransmission.

In one possible implementation, the indication information is encoded independently of the third information; and the indication information and the third information are transmitted on the same physical uplink control channel (physical uplink control channel, PUCCH), or the indication information and the third information are transmitted on different PUCCHs. In this way, the instruction information and the third information can be analyzed separately.

In one possible implementation, the indication information is jointly encoded with the third information, the indication information and the third information being transmitted on the same PUCCH. In this way, the indication information and the third information can be resolved jointly.

In a possible implementation manner, in a case where the terminal device is not configured with the code block group CBG, the first information is used to indicate any one of an average value, a first normalized value, a maximum value or a second normalized value of LDPC decoding iteration numbers corresponding to all CBs in one TB and corresponding to the CB that is decoded correctly. I.e. in case the terminal device is not configured with CBG, the first information may be fed back with TB as granularity.

In a possible implementation manner, the terminal device is not configured with a CBG, and when the third information includes an ACK, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, and any one of the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, a second normalized value, the number of CBs that are decoded correctly in one TB, a third normalized value, the number of CBs that are decoded incorrectly in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount. Namely, when the terminal device is not configured with the CBG and the feedback information includes the third information, the same or different first information or second information can be fed back when the third information is different, so that the network device can perform OLLA adjustment according to the first information or the second information, accurately track the channel or the interference, update the appropriate MCS, and improve the decoding success rate and the spectrum utilization rate of the new transmission and the retransmission.

In one possible implementation manner, in a case where the terminal device configures the CBG, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a normalized value corresponding to the average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, or a normalized value corresponding to the maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG. I.e. in case the terminal device configures the CBG, the first information may be fed back with CBG as granularity.

In a possible implementation manner, in a case that the terminal device configures the CBG, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, or a second normalized value; the second information is used to indicate the first adjustment amount. I.e. in case the terminal device configures CBG, the first information may be fed back with TB as granularity.

In one possible implementation manner, the terminal device configures a CBG, and when the third information includes an ACK, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, and any one of the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that decode correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are correctly decoded in one TB, a second normalized value, the number of CBs that are correctly decoded in one TB, a third normalized value, the number of CBs that are incorrectly decoded in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount. Namely, when the terminal equipment configures the CBG and the feedback information includes the third information, the same or different first information or second information can be fed back when the third information is different, so that the network equipment can perform OLLA adjustment according to the first information or the second information, accurately track the channel or the interference, update the proper MCS, and improve the decoding success rate and the spectrum utilization rate of the new transmission and the retransmission.

In one possible implementation, the terminal device receives fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level. The fourth information may be higher layer signaling, i.e. the granularity of the first information or the second information may be indicated to the terminal device by the higher layer signaling.

In one possible implementation, the method further includes: the terminal equipment reports the capability parameter, and the capability parameter is used for indicating the terminal equipment to support feedback of the first information or the second information. In this way, the network device may determine whether to configure the feedback first information or the second information for the terminal device according to the capabilities of the terminal device.

In one possible implementation manner, when the terminal device is configured to feed back the first information and the terminal device is configured to CBG transmission, the terminal device performs TB-level data transmission; or when the terminal equipment is configured to feed back the first information, the terminal equipment is not configured to CBG transmission. I.e. the feedback first information and the CBG transmission are not co-existing or have different priorities.

In a second aspect, an embodiment of the present application provides a feedback information transmission method, including: the network equipment sends a downlink physical shared channel PDSCH to the terminal equipment; the network equipment receives feedback information from the terminal equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information; wherein, the first information is related to the average value of the decoding iteration times of the low density parity check code (LDPC) corresponding to the first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.

Based on the method provided by the embodiment of the application, after the network device sends the PDSCH, the network device may receive the indication information from the terminal device, and it should be understood that the content of the first indication may reflect the remaining amount of PDSCH decoding, and may perform OLLA adjustment according to the remaining amount of PDSCH decoding. The content indicated by the second information may directly reflect an adjustment amount (e.g., SNR adjustment amount, SINR adjustment amount, CQI adjustment amount, or MCS adjustment amount) related to OLLA adjustment. Therefore, the network equipment can perform OLLA adjustment according to the indication information, accurately track the channel or the interference and update the proper MCS, and can improve the decoding success rate and the spectrum utilization rate of the new transmission and the retransmission.

In one possible implementation, the first CB includes all CBs in one TB, or a CB in one TB that decodes correctly, or a CB in one TB that decodes incorrectly; the first CB includes all CBs in one CBG, or a CB in one CBG that decodes correctly, or a CB in one CBG that decodes incorrectly.

In one possible implementation manner, the first information is used for indicating an average value of the LDPC decoding iteration numbers corresponding to all CBs in one TB, or a first normalization value determined according to the average value and a preset LDPC decoding iteration number; or the first information is used for indicating the maximum value in the LDPC decoding iteration number corresponding to the CB with correct decoding in one TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration number; or the first information is used for indicating the number of the correct coded CBs in one TB, or a third normalization value determined according to the number of the correct coded CBs and the number of all CBs in one TB; or the first information is used for indicating the number of the CBs with decoding errors in one TB, or a fourth normalization value determined according to the number of the CBs with decoding errors and the number of all CBs in one TB.

In one possible implementation manner, the feedback information further includes third information, where the third information includes acknowledgement ACK or negative acknowledgement NACK, and when the third information includes ACK, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, and any one of the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, a second normalized value, the number of CBs that are decoded correctly in one TB, a third normalized value, the number of CBs that are decoded incorrectly in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount.

In one possible implementation, the indication information is encoded independently of the third information; and the indication information and the third information are transmitted on the same physical uplink control channel PUCCH, or the indication information and the third information are transmitted on different PUCCHs.

In one possible implementation, the indication information is jointly encoded with the third information, the indication information and the third information being transmitted on the same PUCCH.

In a possible implementation manner, in a case where the terminal device is not configured with the code block group CBG, the first information is used to indicate any one of an average value, a first normalized value, a maximum value or a second normalized value of LDPC decoding iteration numbers corresponding to all CBs in one TB and corresponding to the CB that is decoded correctly.

In one possible implementation, the terminal device is not configured with a CBG.

In one possible implementation manner, in a case where the terminal device configures the CBG, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a normalized value corresponding to the average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, or a normalized value corresponding to the maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG.

In a possible implementation manner, in a case that the terminal device configures the CBG, the first information is used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, or a second normalized value; the second information is used to indicate the first adjustment amount.

In one possible implementation, the CBG is configured at the terminal device.

In one possible implementation, the network device sends fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level.

In one possible implementation, the method further includes: the network device receives a capability parameter from the terminal device, where the capability parameter is used to instruct the terminal device to support feedback of the first information or the second information.

In a third aspect, an embodiment of the present application provides a communication apparatus, which may be a terminal device, including: a receiving unit, configured to receive a downlink physical shared channel PDSCH from a network device; the sending unit is used for sending feedback information to the network equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information; wherein, the first information is related to the average value of the decoding iteration times of the low density parity check code (LDPC) corresponding to the first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.

In one possible implementation manner, the first information is used for indicating an average value of the LDPC decoding iteration numbers corresponding to all CBs in one TB, or a first normalization value determined according to the average value and a preset LDPC decoding iteration number; or the first information is used for indicating the maximum value in the LDPC decoding iteration number corresponding to the CB with correct decoding in one TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration number; or the first information is used for indicating the number of the correct coded CBs in one TB, or a third normalization value determined according to the number of the correct coded CBs and the number of all CBs in one TB; or the first information is used for indicating the number of the decoding-error CBs in one TB, or a fourth normalized value determined according to the number of the decoding-error CBs and the number of all CBs in one TB.

In one possible implementation, the CBG is configured at the terminal device.

In a possible implementation manner, the receiving unit is further configured to receive fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level.

In one possible implementation manner, the sending unit is further configured to report a capability parameter, where the capability parameter is used to instruct the terminal device to support feedback of the first information or the second information.

In one possible implementation manner, when the terminal device is configured to feed back the first information and the terminal device is configured to CBG transmission, the terminal device performs TB-level data transmission; or when the terminal equipment is configured to feed back the first information, the terminal equipment is not configured to CBG transmission.

In a fourth aspect, an embodiment of the present application provides a communication apparatus, which may be a network device, including: a transmitting unit, configured to transmit a downlink physical shared channel PDSCH to a terminal device; the receiving unit is used for receiving feedback information from the terminal equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information; wherein, the first information is related to the average value of the decoding iteration times of the low density parity check code (LDPC) corresponding to the first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.

In one possible implementation, the CBG is configured at the terminal device.

In a possible implementation manner, the sending unit is further configured to send fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level.

In a possible implementation manner, the receiving unit is further configured to receive, by the network device, a capability parameter from the terminal device, where the capability parameter is used to indicate that the terminal device supports feedback of the first information or the second information.

In a fifth aspect, an embodiment of the present application further provides a communication apparatus, where the communication apparatus may be a terminal device or a chip. The communication device comprises a processor, configured to implement any one of the feedback information transmission methods provided in the first aspect. The communication device may also include a memory for storing program instructions and data, which may be a memory integrated within the communication device or an off-chip memory disposed external to the communication device. The memory is coupled to the processor, and the processor may invoke and execute program instructions stored in the memory for implementing any of the feedback information transfer methods provided in the first aspect. The communication apparatus may also include a communication interface for the communication apparatus to communicate with other devices (e.g., network devices).

In a sixth aspect, the embodiment of the present application further provides a communication apparatus, where the communication apparatus may be a network device or a chip. The communication device comprises a processor for implementing any one of the feedback information transmission methods provided in the second aspect. The communication device may also include a memory for storing program instructions and data, which may be a memory integrated within the communication device or an off-chip memory disposed external to the communication device. The memory is coupled to the processor, and the processor may invoke and execute program instructions stored in the memory for implementing any of the feedback information transfer methods provided in the second aspect above. The communication apparatus may further comprise a communication interface for the communication apparatus to communicate with other devices (e.g. terminal devices).

In a seventh aspect, an embodiment of the present application provides a computer readable storage medium, including instructions which, when run on a computer, cause the computer to perform any one of the feedback information transmission methods provided in the first aspect or the second aspect.

In an eighth aspect, an embodiment of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform any one of the feedback information transmission methods provided in the first or second aspects above.

In a ninth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, where the processor is configured to implement any one of the feedback information transmission methods provided in the first aspect or the second aspect. The chip system may be formed of a chip or may include a chip and other discrete devices.

In a tenth aspect, an embodiment of the present application provides a communication system including the communication apparatus in the third aspect and the communication apparatus in the fourth aspect.

Drawings

Fig. 1 is a feedback diagram of an MCS adjustment according to the prior art;

fig. 2 is a schematic structural diagram of a TB according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a CBG according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a system architecture according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 7 is a schematic diagram of signal interaction according to an embodiment of the present application;

fig. 8 is a schematic diagram of a bit field corresponding to third information and indication information provided in an embodiment of the present application;

FIG. 9 is a schematic diagram of still another signal interaction provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a resource related to first information according to an embodiment of the present application;

FIG. 11 is a schematic diagram of another resource related to first information according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of still another terminal device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of still another network device according to an embodiment of the present application.

Detailed Description

For clarity and conciseness in the description of the embodiments below, a brief introduction to related concepts or technologies is first given:

(1) URLLC: URLLC is the fifth generation (5 ^th generation, 5G) one of three typical services of a mobile communication system. The main application scene comprises: unmanned, telemedicine, etc., these application scenarios place more stringent demands on reliability and time delay. Specific requirements of URLLC traffic include: the data transmission reliability reaches 99.999%, the transmission delay is lower than 1ms, and the instruction overhead is reduced as much as possible under the condition of meeting the requirements of high reliability and low delay. Among the three typical services of 5G include enhanced mobile broadband (enhanced Mobile broadband, emmbb), mass machine type communication (massive Machine Type communication, mMTC) and URLLC.

(2) TB transmission: the uplink and downlink data sharing channels may be data transmission in a basic unit of TB. Since NR systems need to support significantly larger TB sizes than LTE, as shown in fig. 2, each TB may be divided into CBs according to rules predefined by the standard protocol, each with a respective CRC. CRCs may be used to introduce certain redundancy information to ensure that the transmitted information has certain error detection or correction capabilities. In general, when all CBs within a TB pass their respective CRC checks, i.e., all CBs decode correctly, the TB can also pass its own CRC check, i.e., the TB decodes correctly. The HARQ feedback corresponding to this TB by the UE may be ACK at this time; if one or more CBs within a TB cannot pass the respective CRC check, i.e., at least one CB decoding error, the TB cannot pass the own CRC check, i.e., the TB decoding error. At this time the UE may NACK for the HARQ feedback corresponding to this TB. For example, the size of the data packet in the R16 URLLC typical application scenario may be obtained by referring to the system simulation assumption table in the annex a.2 section in TR38.824, and the number of CBs corresponding to the size of the data packet in each application scenario may be obtained by defining the size of the CBs through the NR protocol.

(3) CBG transmission: in NR systems, when the data transmission rate is relatively large, the size of each TB may be large. Once this TB is decoded in error, the entire TB retransmission is caused. Since the TB may be divided into a plurality of Code Blocks (CBs) before encoding, some CBs may be decoded correctly and some CBs may be decoded incorrectly at the receiving end, and retransmission of the entire TB is not advisable, resulting in lower resource utilization. Therefore, ACK/NAK feedback can be performed for each CB, so that if a certain TB fails to decode, the terminal only needs to retransmit the CB with transmission error, and does not need to retransmit the entire TB. Although the feedback based on CB reduces the redundant information of retransmission and can improve the resource utilization rate, a plurality of uplink ACK/NAK needs to be fed back, so that the overhead of uplink signaling is very large, and the resource waste is also caused. To solve this problem, a compromise between TB-based feedback and CB-based feedback was introduced in the NR: as shown in fig. 3, a plurality of CBs in the TB may be grouped, and the grouped CBs may be referred to as a (code block group, CBG). A corresponding ACK/NACK may be fed back for each CBG and retransmitted based on the CBG. To ensure backward compatibility, CBG transmissions are configurable, only users configured with CBG-based transmissions may retransmit based on CBG. It should be noted that even though ACK/NACK feedback is performed for CBG, only TB and CB will carry their own corresponding CRC, UE knows only if CB and TB are decoded correctly by decoding, and CBG does not carry CRC. When CBs within a CBG are all correct, the CBG is considered to be correctly decoded or correctly received, and the HARQ feedback corresponding to the CBG is ACK. Otherwise, when at least one CBG has a CB error, the CBG is considered as a decoding error or a receiving error, and the HARQ feedback corresponding to the CBG is NACK, and retransmission is required.

The base station may configure the UE with TB-based transmission or CBG-based transmission through higher layer signaling, and specific higher layer signaling may refer to codeblockgrouptansision in PDSCH-Config of section 6.3.2 in the communication standard protocol TS 38.331. For example, the base station may inform the UE that CBG transmission is enabled through codeblockgrouptanssion, otherwise equivalent to enabling TB transmission. It should be noted that when the base station does not configure and enable the higher layer parameter codeBlockGroupTransmsision for one UE, the UE may perform CBG-based transmission, i.e. 1 TB contains at least 1 CBG, and the UE may determine the number of maximum CBGs contained in 1 TB by the higher layer parameter maxCodeBlockGroupsPerTransportBlock and generate one bit of HARQ-ACK information for each CBG; when the base station does not configure and enable the higher layer parameter codeBlockGroupTransmsision for one UE, the UE may make a TB-based transmission, i.e. the UE generates one bit of HARQ-ACK information for each TB.

(4) AMC technology: the AMC technology is widely used in wireless transmission systems, and adapts to the changing wireless channel quality by adaptively adjusting the MCS used by the communication system, thereby improving the reliability of wireless transmission and the system throughput. Specifically, the technology can measure the quality of a wireless channel by monitoring the SINR of the wireless channel, predict the channel quality at the future moment according to the measurement result, and finally, select a proper MCS by searching a preset SINR threshold table based on the prediction result.

(5) OLLA: OLLA may be used to adjust the predicted SINR. Due to imperfections in the actual system and time-varying characteristics of the wireless channel, there is an unavoidable error between the predicted SINR and the actual corresponding SINR. In order to reduce the influence of the prediction error of the SINR on the system performance and improve the robustness of the whole system, the prediction SINR can be adjusted through the OLLA. For example, an initial SINR adjustment (also referred to as OLLA initial value) may be set first, and then convergence adjustment may be performed in small steps until the initial block error rate (initial block error rate, IBLER) of the user meets the IBLER target value. To reach the IBLER target value, OLLA adjustment needs to make up for two part errors, one part is the difference between the measured SINR (or SINR threshold) at the current time and the actual demodulation decoding SINR, called the measured error; another part is SINR fluctuations due to time variations of the radio channel, etc. The amount of error that needs to be accounted for is often different under different wireless environments or channel conditions.

However, the existing OLLA initial value adopts a fixed initial value, and cannot reflect all the situations of the wireless environment. The improper selection of OLLA initial value will directly result in the time required for OLLA to adjust to the convergence state becoming long, thereby affecting the performance of the system. In particular, for packet traffic in mobile broadband (mobile broad band, MBB) traffic, the transmission time of the data traffic is short, and there is insufficient data for OLLA adjustment convergence. Therefore, in the whole transmission process of the packet service, due to the deviation of the OLLA adjustment amount, the performance of the AMC is greatly reduced.

Moreover, the existing OLLA technology cannot work normally in a URLLC scene, including the following reasons: (1) The target BLER of URLLC is typically very low, typically at 10 ^-5 Left and right. According to delta _ACK And delta _NACK The relation between the delta and delta is known in the URLLC scene _NACK ＝99999·Δ _ACK . Once NACK occurs (i.e. the UE feeds back NACK), the downward adjustment of MCS is very large, and then performing OLLA adjustment back to the original MCS through ACK (i.e. the UE feeds back ACK) requires many transmission iterative adjustments, which means that the average MCS will be very low most of the time, resulting in low spectral efficiency. In other words, compared with the OLLA adjustment amount delta corresponding to NACK _NACK OLLA adjustment amount delta corresponding to ACK _ACK Very small, the ability to track channel or interference variations has been lost. (2) The probability of NACK triggering OLLA adjustment in URLLC is very low, especially for the scene where low latency requirements avoid retransmission, there is not enough NACK to converge OLLA. In this scenario, the base station can only perform OLLA adjustment according to the ACK fed back by the UE, however, in the prior art, the base station does not carry additional information, and can only perform adjustment according to the adjustment amount delta corresponding to the fixed ACK _ACK And (5) performing MCS adjustment. (3) Considering low latency transmission of URLLC, the data transmission failure requires retransmission to increase overall latency, and according to analysis discussion of companies, one retransmission can be tolerated at most This retransmission is critical and the base station must ensure that the UE is able to decode successfully. In one possible design, OLLA or CQI or MCS may be significantly reduced so that the transmission code rate becomes extremely low. Although this can guarantee that the UE successfully receives the retransmission information with a high probability, excessive resources allocated to the UE may be caused by excessive adjustment, resulting in extremely low spectrum efficiency, and thus affecting the transmission of other UEs.

The application provides a feedback information transmission method, after a terminal device receives a TB from a network device, the terminal device can send feedback information to the network device, wherein the feedback information comprises first information, and the first information is used for indicating the average value of LDPC decoding iteration times corresponding to all CBs in the TB, or a first normalization value (the normalization value can also be called as normalization quantization value) determined according to the average value and a preset LDPC decoding iteration time; or, the first information is used for indicating the maximum value in the LDPC decoding iteration number corresponding to the CB with correct decoding in the TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration number; or the first information is used for indicating the number of the CBs which are correctly decoded in the TB, or a third normalization value which is determined according to the number of the CBs which are correctly decoded and the number of all CBs in the TB; or, the first information is used for indicating the number of the CBs with decoding errors in the TB, or a fourth normalization value determined according to the number of the CBs with decoding errors and the number of all CBs in the TB; or, the first information is used to indicate an adjustment amount of OLLA. It should be understood that the content indicated by the first information may reflect the remaining amount of PDSCH decoding, and feed back different first information to the network device, so as to help the network device to perform OLLA adjustment according to the decoding condition of the UE, accurately track the channel or interference, update the appropriate MCS, and help to improve the decoding success rate of new transmission and retransmission and improve the spectrum utilization.

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (univeRMal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, 5G mobile communication system or New Radio (NR), etc., the 5G mobile communication system of the present application includes a non-stand alone Networking (NSA) 5G mobile communication system and/or a stand alone networking (SA) 5G mobile communication system. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system. The communication system may also be a future evolution public land mobile network (public land mobile network, PLMN) network, a device-to-device (D2D) network, a machine-to-machine (machine to machine, M2M) network, an internet of things (internet of things, ioT) network, or other network.

As shown in fig. 4 (a), the communication system provided by the embodiment of the present application includes a network device 110 and a terminal device 120, where point-to-point transmission can be performed between the network device 110 and the terminal device 120. As shown in (b) of fig. 4, the communication system includes a network device 110, a terminal device 120, a relay node 140, and a relay node 150, and the network device 110 communicates with the terminal device 120 through multi-hop relay nodes (e.g., the relay node 140 and the relay node 150). As shown in (c) of fig. 4, the communication system includes a network device 110, a terminal device 120, and a network device 130. Network device 110, terminal device 120, and network device 130 may be in a dual link/dual connection (dual connectivity, DC) or coordinated multipoint transmission (coordinated multipoint transmission/reception, coMP) scenario. The network device 110 may be a network device when the terminal device 120 is initially accessed, responsible for RRC communication with the terminal device 120, and the network device 130 is added at the time of RRC reconfiguration to provide additional radio resources. The terminal device 120 configured with CA is connected to the network device 110 and the network device 130, and the link between the network device 110 and the terminal device 120 may be referred to as a first link, and the link between the network device 130 and the terminal device 120 may be referred to as a second link. As shown in (d) of fig. 4, the communication system includes a network device 110, a terminal device 120, a relay node 140, and a relay node 150, and the network device 110 and the terminal device 120 communicate through different relay nodes (e.g., the relay node 140 or the relay node 150).

It should be noted that fig. 4 is an example of a scenario of a communication system to which an embodiment of the present application is applied, and does not impose limitation on a network architecture applicable to the present application. For example, the number of network devices and terminal devices included in the communication system may also be other numbers. Moreover, the present application is not limited to uplink, downlink, access link, backhaul (backhaul) link, sidelink (sidelink), etc. transmissions.

The terminal device related to the embodiment of the application can also be called a terminal, can be a device with a wireless receiving and transmitting function, and can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal device may be a UE, wherein the UE comprises a handheld device, an in-vehicle device, a wearable device, or a computing device with wireless communication capabilities. The UE may be a mobile phone (mobile phone), a tablet computer, or a computer with a wireless transceiver function, for example. The terminal device may also be a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned, a wireless terminal in telemedicine, a wireless terminal in smart grid, a wireless terminal in smart city, a wireless terminal in smart home, etc. In the embodiment of the present application, the device for implementing the function of the terminal may be the terminal; or may be a device, such as a chip system, capable of supporting the terminal to perform the function, which may be installed in the terminal. In the embodiment of the application, the chip system can be composed of chips, and can also comprise chips and other discrete devices. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the terminal is the terminal, and the terminal is the UE, which is taken as an example, to describe the technical solution provided in the embodiment of the present application.

The network device or the relay node according to the embodiment of the present application includes an access network device, for example, a Base Station (BS), which may be a device deployed in a radio access network and capable of performing wireless communication with a terminal. Among them, the base station may have various forms such as macro base station, micro base station, relay station, access point, etc. For example, the base station involved in the embodiment of the present application may be a base station in 5G or an Evolved Node B (eNB) in LTE, where the base station in 5G may also be referred to as a transmission receiving point (transmission reception point, TRP) or a 5G base station (Next-Generation Node B, gNB). In the embodiment of the present application, the device for implementing the function of the network device may be a network device; or may be a device, such as a system-on-a-chip, capable of supporting the network device to perform this function, which may be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is a network device, and the network device is a base station as an example, which describes the technical solution provided in the embodiment of the present application.

The technical scheme provided by the embodiment of the application can be applied to wireless communication among communication equipment. The wireless communication between the communication devices may include: wireless communication between a network device and a terminal, wireless communication between a network device and a network device, and wireless communication between a terminal and a terminal. In the embodiments of the present application, the term "wireless communication" may also be simply referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission" or "transmission". Wireless communication can be performed between communication devices by using air interface resources. The communication device may include a network device, which may also be referred to as a base station device, and a terminal device. The air interface resources may include at least one of time domain resources, frequency domain resources, code resources, and space resources.

The terminal device or the network device in fig. 4 according to the embodiment of the present application may be implemented by one device, or may be a functional module in one device, which is not limited in particular. It will be appreciated that the above described functionality may be either a network element in a hardware device, or a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform), or a system on a chip. In the embodiment of the application, the chip system can be formed by a chip, and can also comprise the chip and other discrete devices.

For example, the means for implementing the functions of the terminal device provided by the embodiment of the present application may be implemented by the apparatus 500 in fig. 5. Fig. 5 is a schematic diagram of a hardware structure of an apparatus 500 according to an embodiment of the present application. The apparatus 500 includes at least one processor 501 configured to implement the functions of the terminal device provided in the embodiment of the present application. A bus 502 and at least one communication interface 504 may also be included in the apparatus 500. Memory 503 may also be included in apparatus 500.

In an embodiment of the application, the processor may be a central processing unit (central processing unit, CPU), a general purpose processor, a network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD). The processor may also be any other device having processing functionality, such as an application-specific integrated circuit (ASIC), a field-programmable gate array (field programmable gate array, FPGA) or other programmable logic device, a transistor logic device, a hardware component, a software module, or any combination thereof.

Bus 502 may be used to transfer information between the components described above.

A communication interface 504 for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc. Communication interface 504 may be an interface, circuit, transceiver, or other device capable of communicating, without limitation of the application. The communication interface 504 may be coupled with the processor 501. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other forms for information interaction between the devices, units, or modules.

In embodiments of the application, the memory may be, but is not limited to, read-only memory (ROM) or other type of static storage device that may store static information and instructions, random access memory (random access memory, RAM) or other type of dynamic storage device that may store information and instructions, but may also be electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate or coupled to the processor, such as through bus 502. The memory may also be integrated with the processor.

The memory 503 is configured to store program instructions and may be controlled by the processor 501 to perform a feedback information transmission method according to the following embodiments of the present application. The processor 501 is configured to invoke and execute instructions stored in the memory 503, thereby implementing a feedback information transmission method provided in the following embodiments of the present application.

Alternatively, the computer-executable instructions in the embodiments of the present application may be referred to as application program codes, which are not particularly limited in the embodiments of the present application.

Optionally, a memory 503 may be included in the processor 501.

In a particular implementation, as one embodiment, processor 501 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 5.

In a particular implementation, the apparatus 500 may include multiple processors, such as the processor 501 and the processor 507 in fig. 5, as one embodiment. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In a specific implementation, as an embodiment, the apparatus 500 may further include an output device 505 and an input device 506. An output device 505 is coupled to the processor 501 and may display information in a variety of ways. For example, the output device 505 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like. The input device 506 is coupled to the processor 501 and can receive user input in a variety of ways. For example, the input device 506 may be a touch screen device or a sensing device, etc.

The apparatus 500 may be a general purpose device or a special purpose device. In a specific implementation, the terminal device 500 may be an in-vehicle terminal or a traffic device with a built-in computer (processor) or a device having a similar structure as in fig. 5. Embodiments of the present application are not limited in the type of apparatus 500.

For example, the apparatus for implementing the functions of the network device provided by the embodiment of the present application may be implemented by the apparatus 600 in fig. 6. Fig. 6 is a schematic diagram of a hardware structure of an apparatus 600 according to an embodiment of the present application. The apparatus 600 includes at least one processor 601, which is configured to implement the functions of the terminal device provided by the embodiment of the present application. The apparatus 600 may further include a bus 602 and at least one communication interface 604. Memory 603 may also be included in apparatus 600.

Bus 602 may be used to transfer information between the components described above.

A communication interface 604 for communicating with other devices or communication networks, such as ethernet, RAN, WLAN, etc. The communication interface 604 may be an interface, circuit, transceiver, or other device capable of communication, and the application is not limited. A communication interface 604 may be coupled to the processor 601.

The memory 603 is configured to store program instructions and may be controlled to be executed by the processor 601, thereby implementing a feedback information transmission method according to the following embodiments of the present application. For example, the processor 601 is configured to invoke and execute instructions stored in the memory 603, thereby implementing a feedback information transmission method provided in the following embodiments of the present application.

Optionally, a memory 603 may be included in the processor 601.

In a particular implementation, the processor 601 may include one or more CPUs, such as CPU0 and CPU1 of FIG. 6, as an embodiment.

In a particular implementation, the apparatus 600 may include multiple processors, such as the processor 601 and the processor 605 in FIG. 6, as one embodiment. Each of these processors may be a single-core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The apparatus 600 may be a general purpose device or a special purpose device. In a specific implementation, the apparatus 600 may be a vehicle-mounted terminal or a traffic device with a built-in computer (processor) or a device with a similar structure as in fig. 6. Embodiments of the present application are not limited in the type of apparatus 600.

In the embodiment of the application, the terminal equipment or the network equipment comprises a hardware layer, an operating system layer running on the hardware layer and an application layer running on the operating system layer. The hardware layer includes hardware such as a CPU, a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided by the embodiment of the present application, as long as the communication can be performed by the method provided according to the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, and for example, the execution body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

Furthermore, various aspects or features of the application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, or magnetic strips, etc.), optical disks (e.g., CD, digital versatile disk (digital versatile disc, DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card, stick, key drive, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided by the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided by the embodiments of the present application is applicable to similar technical problems.

In the description of the present application, "/" means or, unless otherwise indicated, for example, A/B may represent A or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Also, in the description of the application, unless otherwise indicated, "at least one" means one or more. "plurality" means two or more than two. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

It should be noted that in the embodiments of the present application, "of", "corresponding" and "corresponding" may be mixed in some cases, and signaling and messages may be mixed in some cases, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized.

The names of messages between network elements or the names of parameters in the messages in the following embodiments of the present application are only an example, and may be other names in specific implementations, which are not limited in particular by the embodiments of the present application.

For easy understanding, the feedback information transmission method provided by the embodiment of the application is specifically described below with reference to the accompanying drawings.

As shown in fig. 7, an embodiment of the present application provides a feedback information transmission method, including:

701. the network device transmits PDSCH to the terminal device.

Wherein, the PDSCH may carry TBs. The PDSCH may be scheduled by the network device by transmitting downlink control information (downlink control information, DCI) to the terminal device (e.g., UE) before the PDSCH is transmitted by the network device. The DCI may be carried in a physical downlink control channel (physical downlink control channel, PDCCH), and the DCI may be used to indicate relevant scheduling information such as time-frequency resources of the TBs.

702. The terminal device receives PDSCH from the network device.

Wherein, the PDSCH carries the TB. The terminal device may decode the PDSCH to determine whether the TB was received correctly.

703. And the terminal equipment sends feedback information to the network equipment.

The feedback information comprises indication information, and the indication information comprises first information or second information. Wherein, the first information is related to an average value of LDPC decoding iteration times corresponding to the first CB; or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, wherein the first adjustment amount comprises an SNR adjustment amount, an SINR adjustment amount, a CQI adjustment amount or an MCS adjustment amount; the first adjustment amount is determined based on the first information.

The first CB may include all CBs in one TB, or a CB in one TB that decodes correctly, or a CB in one TB that decodes incorrectly. Alternatively, the first CB may include all CBs in one CBG, or a CB in one CBG that decodes correctly, or a CB in one CBG that decodes incorrectly.

By way of example, the content indicated by the first information may include the following:

(one), the first information may be used to indicate an average value of LDPC decoding iterations corresponding to all CBs in one TB, or a first normalized value corresponding to the average value.

The LDPC generally adopts iterative decoding, and the higher iteration times can realize better system performance. Different iteration numbers reflect different decoding margins (decoding margin). The low PDSCH decoding margin indicates that the magnitude of the MCS to be adjusted is relatively small, and since the UE is able to decode the correct margin low, the rate of the code is greatly increased as much as possible without increasing the MCS. The high PDSCH decoding margin indicates that the MCS needs to be adjusted to a larger extent, and since the UE can decode the correct margin to a larger extent, the rate of the code can be increased by properly increasing some MCSs, thereby improving the transmission efficiency. The medium PDSCH coding margin is between the two. For example, assuming that the maximum number of times of LDPC decoding is 20, 15 or more iterations can correctly indicate that the PDSCH decoding margin is relatively low, and about 5 or more iterations can correctly indicate that the PDSCH decoding margin is relatively high. Therefore, based on the iteration times, the base station can determine the decoding condition of the UE, and the base station can adjust OLLA according to the decoding condition of the UE, accurately track the channel or the interference and update the proper MCS, thereby being beneficial to improving the decoding success rate of new transmission and retransmission and improving the spectrum utilization rate.

In one possible scenario, an iteration number may be preset in consideration of cost, complexity, etc., and once the actual iteration number exceeds the preset iteration number, iterative decoding is stopped. Due to each ofThe manufacturer has different specific implementations, so the number of the implemented LDPC decoding iterations is different. Therefore, each vendor's terminal may not be able to provide valid information to report an LDPC decoding iteration number, and thus may consider reporting a normalized value (e.g., a first normalized value). First normalized value r _K Can be defined as the average value of the actual LDPC decoding iteration times corresponding to all CBs in the TBAnd preset iteration times K _default Ratio of (2), i.eIn this way, the effect of different vendors on implementation can be eliminated.

The terminal device may directly report an average value of the LDPC decoding iteration numbers corresponding to all CBs in the TB, or a first normalization value corresponding to the average value. In one possible case, since the first normalized value has a large number of values, direct reporting may cause a large overhead, so that the interval [0,1] of the first normalized value may be quantized, and a bit field (bit field) or a bit state (codebook) corresponding to the corresponding interval may be reported.

For example, the communication protocol may be predefined to beThe result of (a) is quantized into four bins, and the mapping relationship between different bit fields or bit states and quantization bins can be as shown in table 1. When the UE decodes a TB, it is assumed that the TB includes 10 CBs, if the average LDPC decoding iteration number of the 10 CBsThe preset iteration number is K _default =15, availableAccording to the mapping relation, the corresponding bit field or bit state is known to be "01", and the UE can report "01". This example is one possible implementation and the bit field may be not limited to just 2 bits, but more. The quantization interval may be divided according to other ratios instead of the equal division, and the present application is not limited thereto.

TABLE 1

The average value of the LDPC decoding iteration number is calculated for CBs included in 1 TB. Each CB of the 1 TBs corresponds to an LDPC iteration value. The average value may be a statistical average of all CBs within one TB, or may be a statistical average of CBs decoded correctly within one TB. The statistics will not be generally performed on CBs with decoding errors in one TB, because the UE will try to decode each CB, i.e. reach a preset number of iterations, and consider the CB decoding error if the CB still fails the CRC check. Therefore, the number of LDPC decoding iterations corresponding to each erroneous CB is generally equal to the preset number of LDPC decoding iterations.

For example, assume that 1 TB includes 8 CBs, 6 out of the 8 CBs being decoded correctly and 2 out of the 8 CBs being decoded incorrectly. LDPC decoding iteration times corresponding to CB with correct decoding respectivelyMay be different, e.g. may be respectivelyLDPC decoding iteration number corresponding to CB of decoding errorEqual to a preset number of iterations, assumingIf the statistics of the average value of the LDPC decoding iteration number is performed for all CBs in the TB, thenThen "11" in table 2 corresponds. If the average value of LDPC decoding iteration times corresponding to CB for correctly decoding all the MTB is counted, thenThen "10" in the table is corresponded.

And (II) the first information is used for indicating the maximum value in the LDPC decoding iteration times corresponding to the CB with correct decoding in one TB or the second normalization value corresponding to the maximum value.

It is understood that the number of LDPC decoding iterations corresponding to different CBs in one TB may be different. In the embodiment of the application, the LDPC decoding iteration number corresponding to CB refers to the actual LDPC decoding iteration number corresponding to CB. The CB with the largest iteration number reflects the worst decoding condition of the CB and the largest number of needed decoding iterations. The UE reports this information to the gNB, which tells the gNB whether the current TB is decoded correctly, but the effort to decode correctly is "relaxed", or "medium", or "very difficult", corresponding to whether the channel environment is good, or bad. After the gNB obtains the information, future OLLA adjustment or MCS adjustment may be measured. In the prior art, after the gcb determines that the UE feeds back the ACK, the MCS can only be adjusted according to a fixed step size, but all CB iteration times may be already close to or reach a preset value at this time, and if the MCS is raised, the next TB decoding failure is likely to be caused.

The terminal device may directly report the maximum value of the LDPC decoding iteration number corresponding to the CB with correct decoding in the TB, or a normalized value (e.g., a second normalized value) corresponding to the maximum value.

Exemplary, assuming that 1 TB contains T CBs, the actual LDPC decoding iteration number corresponding to the ith CB is K _actual，i Presetting the iteration number K _default The second normalized value ri of the actual LDPC decoding iteration number corresponding to the ith CB may be defined as the actual LDPC decoding iteration number K _actual，i And preset iteration times K _default Ratio of (r), i.e. r _i ＝K _actual，i /K _default . The actual LDPC decoding iteration number corresponding to all correctly decoded CBs in the TB can be expressed asWherein the maximum number of LDPC decoding iterations A second normalization value corresponding to the maximum valueFor example, assuming that 1 TB includes 8 CBs, all of the 8 CBs are correctly decoded, but the LDPC decoding iterations corresponding to the correctly decoded CBs are not the same, assuming thatIf the maximum value of the actual LDPC decoding iteration number corresponding to CB with correct decoding in TB is 12, the second normalization value corresponding to the maximum valueThe UE can report directlyTo the gNB.

In one possible design, since the second normalized value has a larger value, directly reporting the second normalized value causes a larger overhead, so that the interval [0,1 ] covered by the second normalized value can be covered ]And quantizing, and reporting the bit domain or bit state corresponding to the corresponding interval. For example, the communication protocol predefining may be toThe quantization is four intervals, and the mapping relationship between the bit domain or bit state and the quantization interval can be as shown in table 2. When (when)When given, the UE may report "11" to the gNB. This example is one possible implementation, and the bit field is not limited to 2 bits, but may be more bits. The quantization interval may be divided according to other ratios instead of the equal division, and the present application is not limited thereto.

TABLE 2

And thirdly, the first information is used for indicating the number of the correct coded CBs in one TB or a third normalized value corresponding to the number of the correct coded CBs.

Since the TB and the CB carry the corresponding CRC, the UE can clearly know which CB in the TB is decoded correctly in the decoding process, so that the proportion of the CB decoded correctly in the TB can be obtained. Thus, if 1 TB is decoded in error, the base station receives NACK fed back by the UE, the base station may obtain the proportion of CB in TB with correct decoding, and may know whether the erroneous TB is unable to pass CRC check due to a small number (e.g., 1) of CB decoding errors, or the TB is unable to pass CRC check due to a large number (e.g., all) of CB decoding errors, so as to know whether the channel environment where the UE is located is medium or bad, and the adjustment of OLLA or CQI or MCS may take compensation of corresponding magnitude, so as to avoid the problems of low resource utilization and low spectrum efficiency caused by excessive adjustment.

It will be appreciated that when the UE decodes 1 TB correctly, all CBs contained within that TB are also decoded correctly. This is because if there are 1 or more CBs with errors, the probability that this TB decodes correctly is extremely low. Therefore, when the TB is decoded correctly, the maximum value of the actual LDPC decoding iteration numbers corresponding to all CBs included in the TB, or the second normalized value corresponding to the maximum value, may be reported. When the TB is in error decoding, the maximum value in the actual LDPC decoding iteration times corresponding to all correct decoding CBs in all CBs contained in the TB or the second normalization value corresponding to the maximum value can be reported.

The terminal device may directly report the number of CBs with correct decoding in the TB, or a third normalized value corresponding to the number of CBs with correct decoding.

For example, assuming that 1 TB contains T CBs, the number of correctly decoded CBs is n _ACK Decoding the correct CB corresponding third normalized value p _ACK Can be defined as the number n of correctly decoded CBs _ACK The ratio to the number T of CBs contained in said TB, i.e. p _ACK ＝n _ACK and/T. For example, 1 TB may include 10 CBs, 2 CBs are decoded correctly, 8 CBs are decoded in error, the TB cannot pass CRC check, the decoding error, and the UE may feed back NACK. At this time, the proportion of correctly decoded CBs in the TB is For the TB, the UE may report p directly _ACK Give gnb=0.2.

Or the terminal device may report the bit state or the bit field corresponding to the third normalized value corresponding to the number of CBs with correct decoding. Because the third normalized value has more value, the direct report of the third normalized value is considered to cause larger expenditure, so the intervals [0,1 ] covered by the third normalized value can be covered]And quantizing, and only reporting the bit domain or bit state corresponding to the corresponding interval. For example, the communication protocol may predefine that the third normalized value p will be _ACK The result of (a) is quantized into four intervals, and the mapping relationship between the bit domain or bit state and the quantization interval can be as shown in table 3. When p is _ACK When given =0.2, the UE may report "00" to the gNB. This example is one possible implementation, and the bit field is not limited to 2 bits, but may be more bits. The quantization interval may be divided according to other ratios instead of the equal division, and the present application is not limited thereto.

TABLE 3 Table 3

Bit field or bit state	Quantization interval of p < ACK ]
00	0≤p _ACK ＜0.25
01	0.25≤p _ACK ＜0.5
10	0.5≤p _ACK ＜0.75
11	p _ACK ≥0.75

And fourth, the first information is used for indicating the number of the decoding error CBs in one TB or a fourth normalization value corresponding to the number of the decoding error CBs.

The fourth case is similar to the third case, so that the reporting manner is also similar, and will not be repeated here.

In the four cases (one), (two), (three) and (four), the content indicated by the first information may reflect the remaining amount of PDSCH decoding (i.e., the decoding situation of the UE), and feedback different first information to the network device, so as to facilitate the network device to perform OLLA adjustment according to the decoding situation of the UE, accurately track the channel or interference, update the appropriate MCS, and facilitate the improvement of the decoding success rate of new transmission and retransmission and the improvement of the spectrum utilization.

The second information may be used to indicate a first adjustment amount, which may include an SNR adjustment amount, an SINR adjustment amount, a CQI adjustment amount, or an MCS adjustment amount. The first adjustment amount may also be referred to as an adjustment amount of OLLA. The first adjustment amount may be determined based on the first information. For example, after determining different normalization values based on the case (one), (two), (three) or (four), the terminal device may further determine a first adjustment amount (SNR adjustment amount, SINR adjustment amount, CQI adjustment amount or MCS adjustment amount) corresponding to the different normalization values. Wherein, the SNR adjustment amount, SINR adjustment amount, CQI adjustment amount, or MCS adjustment amount may be determined by simulation or test of different normalized values.

For example, after determining the first normalization value based on the case (one), the terminal device may further determine a first adjustment amount corresponding to the first normalization value. That is, the communication protocol may provide for the UE to determine a first adjustment (e.g., CQI) based on a first normalized value corresponding to an average of LDPC decoding iterations corresponding to all CBs in the TBAdjustment amount). For example, the communication protocol may specify that the UE may report 4 CQI adjustment amounts (each CQI adjustment amount may be represented by 2 bits of information). May be predefined according to UE own implementation or protocolThe result of (a) is quantized into four intervals, and the mapping relationship between different bit fields or bit states and quantization intervals may be as shown in the table, or the four intervals may be non-equally divided intervals different from table 1. The mapping relationship between different bit fields or bit states and CQI adjustment amounts may be as shown in table 4. The mapping relation between the CQI adjustment amount and the different quantization intervals may be as shown in table 5 or table 6. Wherein, table 5 may belong to UE implementation, or may be a table predefined by a protocol, and table 4 or table 6 may be a mapping relation predefined by the protocol. After the UE decodes the received TB, it is assumed that this TB includes 10 CBs if the average LDPC decoding iteration number of these 10 CBs The preset iteration number is K _default =15, availableThe UE may report the second information ("01") by knowing that the corresponding bit field or bit state is "01" from tables 1 and 4. Alternatively, the UE may report the second information ("01") if the UE knows that the corresponding bit field or bit state is "01" from tables 4 and 5. Alternatively, the UE may report the second information ("01") if the UE knows that the corresponding bit field or bit state is "01" according to the mapping relation of table 6.

TABLE 4 Table 4

Bit field or bit state	CQI adjustment quantity (dB)
00	0
01	2
10	4
11	6

TABLE 5

TABLE 6

In some embodiments, after determining the second normalization value based on the case (ii), the terminal device may further determine the first adjustment amount corresponding to the second normalization value. Or after determining the third normalized value based on the case (iii), the first adjustment amount corresponding to the third normalized value may be further determined. Or after determining the fourth normalized value based on the case (fourth), the first adjustment amount corresponding to the fourth normalized value may be further determined. The process may refer to a process of determining the first adjustment amount based on the first normalization value, which is not described herein.

Optionally, the content indicated by the first information may further include: an average value of the LDPC decoding iteration times corresponding to all CBs in one CBG, or a normalization value (fifth normalization value) determined according to the average value and a preset LDPC decoding iteration time; or, the first information is used for indicating the maximum value in the LDPC decoding iteration number corresponding to the CB with correct decoding in one CBG, or a normalization value (sixth normalization value) determined according to the maximum value and the preset LDPC decoding iteration number; or, the first information is used for indicating the number of CBs decoded correctly in one CBG, or a normalized value (seventh normalized value) determined according to the number of CBs decoded correctly and the number of all CBs in one CBG; alternatively, the first information is used to indicate the number of CBs in a decoding error in one CBG, or a normalized value (eighth normalized value) determined from the number of CBs in the decoding error and the number of all CBs in one CBG. The algorithms of the fifth normalization value to the eighth normalization value may refer to the first normalization value to the fourth normalization value, and only the granularity is different, which is not described herein.

In one possible design, the feedback information further includes third information including an ACK or NACK. When decoding of a TB fails, the UE needs to feed back NACK for the TB in order for the base station to retransmit the TB. And feeding back indication information on the basis of feeding back NACK, wherein the indication information can assist the gNB in performing OLLA adjustment, and the OLLA adjustment comprises SNR adjustment, SINR adjustment, CQI adjustment or MCS adjustment, thereby being beneficial to successful retransmission of the TB. When one TB is successfully decoded, the UE needs to feed back an ACK for this TB so that the base station can continue to transmit the next TB. And feeding back indication information on the basis of feeding back ACK, wherein the indication information can assist the gNB in performing OLLA adjustment, and the OLLA adjustment comprises SNR adjustment, SINR adjustment, CQI adjustment or MCS adjustment, so that the success of the next TB new transmission is facilitated.

The relation of the first information and the third information includes the following features.

a) In the case where the contents of the third information are different, that is, when the third information includes ACK or NACK, respectively, the same indication information (first information or second information) may be associated, or different indication information may be associated, respectively.

When the third information includes ACK, the first information may be used to indicate an average value of LDPC decoding iterations corresponding to all CBs in one TB, any one of the first normalized value, a maximum value of LDPC decoding iterations corresponding to CBs in one TB that are decoded correctly, or the second normalized value; the second information is used to indicate the first adjustment amount.

When the third information includes NACK, the first information may be used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are correctly decoded in one TB, a second normalized value, the number of CBs that are correctly decoded in one TB, a third normalized value, the number of CBs that are incorrectly decoded in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount.

It can be seen that when the third information includes an ACK, the first information is generally free of any one of the number of CBs indicating correct decoding in one TB, the third normalized value, the number of CBs indicating incorrect decoding in one TB, or the fourth normalized value, because: when one TB is correct, all CBs are correctly decoded, at the moment, the number of the CBs which are correctly decoded is the number of all CBs included by the TB, the third normalized value is 1, the number of the CBs which are incorrectly decoded is 0, the fourth normalized value is 0, feedback of the values is not significant, and the adjustment assistance of the base station is not great.

And when the third information includes NACK, the first information may indicate any one of the number of CBs decoded correctly in one TB, the third normalized value, the number of CBs decoded incorrectly in one TB, or the fourth normalized value. The feedback of the number or proportion of the CBs that can be correctly decoded in the TB with one decoding error (i.e. the third normalization value), or the number or proportion of the CBs that can be incorrectly decoded (i.e. the fourth normalization value) can tell the gNB the current allowance of the UE for PDSCH decoding, so that the channel environment where the UE is located can be known, and the gNB can be assisted in OLLA adjustment.

For example, when 1 TB is decoded in error, the erroneous TB may be that the entire TB cannot pass the CRC check only because of the 1 CB decoding error, or that the TB cannot pass the CRC check because of a large number of CBs or all CBs that are decoded incorrectly, the base station may know whether the channel environment in which the UE is located is moderate or bad based on the number of CBs decoded correctly in the TB, the third normalized value, the number of CBs decoded incorrectly in the TB, or the fourth normalized value, and compensate the adjustment of OLLA or CQI or MCS by a corresponding magnitude, so as to avoid the problems of low resource utilization and too low spectrum efficiency caused by excessive adjustment.

In one possible design, the indication information and the third information may be indicated jointly by a plurality of bits, and different bit states may indicate different first information and third information.

In some embodiments, the number of bit states corresponding to the ACK and the number of bit states corresponding to the NACK may be different. In one possible implementation, for example, in the URLLC scenario, the BLER is 10 "5, the probability of the terminal device feeding back the NACK is very low in the highly reliable transmission, in most cases the terminal device feeds back the ACK, and the OLLA adjustment is mainly performed in the feedback ACK scenario, so that the indication information (the first information or the second information) associated with the ACK may be finer than the NACK, and thus the number of bit states corresponding to the ACK may be greater than the number of bit states corresponding to the NACK. In another possible case, PDSCH decoding margin information carried by the UE when feeding back NACK needs to help the retransmission scheduling of the gNB very much, so as to ensure that the gNB can consider both frequency efficiency and BLER. The indication information associated with NACK may be finer, so that the number of bit states corresponding to NACK may be greater than the number of bit states corresponding to ACK.

The following description will take an example of a case where the number of bit states corresponding to NACK is greater than ACK. As shown in table 7, the last state "111" of the 8 bit states may be Reserved (Reserved) for future feature extension use. Of the remaining 7 bit states, 3 bit states such as "000", "001", "010" correspond to ACK, and 4 bit states such as "011", "100", "101", "110" correspond to NACK, i.e., the number of bit states corresponding to ACK and the number of bit states corresponding to NACK may be different. And, the indication information (e.g., first information) corresponding to the ACK may be a second normalized value. The first information corresponding to NACK may be a third normalized value.

TABLE 7

The third information and the indication information may be encoded independently. As shown in fig. 8, the third information (ACK or NACK) may be represented by 1 bit, and the latter 2 bits may represent indication information. The indication information (for example, the first information) may be valued with reference to the bit information shown in tables 1 to 3. The value of the indication information (e.g., the second information) may refer to bit information shown in table 4 or table 6. Of course, the bit field representing the indication information may not be limited to 2 bits, and may include 3 bits, 4 bits, and the like, for example. The position of the bit field indicating the instruction information is not limited to the position after ACK/NACK, and the present application is not particularly limited.

When the indication information is encoded independently of the third information, the indication information and the third information may be transmitted on the same PUCCH or the indication information and the third information may be transmitted on different PUCCHs.

As shown in fig. 9, after receiving a PDCCH for scheduling TBs (DCI is included in the PDCCH) and a PDSCH for transmitting TBs from a network device, the terminal device may perform PDSCH decoding and then feed back indication information (e.g., first information), third information, and/or CSI to the network device. For example, as shown in fig. 10, the first information and the third information may be fed back on the same PUCCH, i.e., the UE may transmit the first information and the third information on the same PUCCH. As shown in fig. 11, the first information and the third information may be fed back on different PUCCHs, for example, on PUCCH2 and PUCCH1, respectively. Alternatively, the first information may be triggered to be reported on another PUCCH (e.g. PUCCH 2) by third information on one PUCCH (e.g. PUCCH 1).

Alternatively, the indication information and the third information may be jointly encoded, that is, the third information and the indication information may be jointly indicated by a plurality of bits, and different bit states may indicate different indication information (e.g., the first information) and the third information. Illustratively, like the bit information of Table 6, one bit field or bit state indicates both the ACK and the new reporting amount. For example, the UE feeds back "110", it indicates that the TB fails to decode, where the number of CBs decoded correctly accounts for more than 75% of the total number of CBs in the TB.

When the indication information and the third information are coded jointly, the indication information and the third information are transmitted on the same PUCCH.

The manner in which the indication information is encoded independently or jointly with the third information and fed back after encoding may be referred to as soft-ACK or soft-NACK, where "soft" means other information (e.g., indication information) than ACK or NACK.

In this way, the flexibility of network scheduling can be further improved through the design of the multiplexing mode and the association mode of the indication information and the third information.

In some embodiments, in a case where the terminal device is not configured with CBG (or is not configured with CBG transmission), i.e. in a case where the network device is not configured with or is not capable of CBG transmission (Not configured code-block-group (CBG) based transmission), the terminal device performs TB-level data transmission, i.e. sends feedback information in a TB granularity, i.e. performs third information (HARQ-ACK information) feedback and indication information feedback in a TB granularity (at this time, HARQ-ACK information feedback and indication information feedback may be bundled, and feedback granularity of both are the same). At this time, the first information may be used to indicate any one of an average value, a first normalized value, a maximum value or a second normalized value of the LDPC decoding iteration numbers corresponding to all CBs in one TB and corresponding to CBs decoded correctly in one TB; the second information is used to indicate the first adjustment amount.

In some embodiments, when the third information includes ACK, the first information is used to indicate an average value of LDPC decoding iterations corresponding to all CBs in one TB, any one of the first normalized value, a maximum value of LDPC decoding iterations corresponding to CBs that are decoded correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, a second normalized value, the number of CBs that are decoded correctly in one TB, a third normalized value, the number of CBs that are decoded incorrectly in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount.

In some embodiments, in the case of a terminal device configuring CBGs, the terminal device may make statistics and feedback based on each CBG in the TB. I.e. the terminal device may send feedback information with CBG granularity. For example, assuming that there are N CBGs within 1 TB, the UE may make statistics for the N CBGs and feedback N sets/pieces of feedback information. The first information may be used to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a normalized value corresponding to an average value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a normalized value corresponding to a maximum value of LDPC decoding iteration numbers corresponding to all CBs in one CBG, a number of CBs decoding correctly in one CBG, a normalized value determined according to a number of CBs decoding correctly and a number of CBs in one CBG, a number of CBs decoding incorrectly in one CBG, or a normalized value determined according to a number of CBs decoding incorrectly and a number of CBs in one CBG; the second information is used to indicate the first adjustment amount.

It will be appreciated that in case the terminal device configures CBG, HARQ feedback may be CBG based, i.e. the terminal device may count for N CBGs and feedback N sets/pieces of third information. Wherein the third information may be ACK or NACK. The terminal device may feed back an ACK for all CBGs in the TB. For example, an ACK may be fed back for all CBGs in a TB, or a NACK may be fed back for all CBGs in a TB, or an ACK may be fed back for part of CBGs in a TB, and a NACK may be fed back for part of CBGs.

In some embodiments, in the case that the terminal device configures the CBG, the first information may be used to indicate an average value of LDPC decoding iterations corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iterations corresponding to CBs that are correctly decoded in one TB, or a second normalized value; the second information may be used to indicate the first adjustment amount. I.e. the terminal device may feed back the first information or the second information with TB granularity. For 1 TB, the UE feeds back 1 set/piece of first information or second information.

In some embodiments, in the case of the terminal device configuring the CBG, when the third information includes an ACK, the first information is used to indicate an average value of LDPC decoding iterations corresponding to all CBs in one TB, any one of the first normalized value, a maximum value of LDPC decoding iterations corresponding to CBs that are decoded correctly in one TB, or the second normalized value; the second information is used for indicating the first adjustment amount; when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in one TB, a first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in one TB, a second normalized value, the number of CBs that are decoded correctly in one TB, a third normalized value, the number of CBs that are decoded incorrectly in one TB, or a fourth normalized value; the second information is used to indicate the first adjustment amount. For 1 TB, the UE feeds back 1 set/piece of first information or second information.

In some embodiments, the CBG transmission configuration may not coexist with the reporting of the first information, including the following two implementations. In one implementation, when the terminal device is configured to feed back the first information and the terminal device is configured to perform CBG transmission, the terminal device performs TB-level data transmission, and the terminal device may generate one HARQ-ACK information bit for each TB, i.e., HARQ feedback is based on the TB granularity. It is also understood that the priority of the feedback first information is higher than the priority of the CBG transmission. In another implementation, when the terminal device supports feedback of the first information, the terminal device does not configure CBG transmission. I.e. when the network device configures the terminal device to feed back the first information (the network device configures the terminal device to feed back the first information, which means that the terminal device needs to feed back the first information), CBG transmission is not configured for the terminal device, and the terminal device performs TB-level data transmission (i.e. If a UE is not provided PDSCH-codeblockgrouptransmsision, the UE generates one HARQ-ACK information bit per transport block). The design of the judging mechanism aiming at the scene that the CBG transmission configuration and the first information can not coexist can effectively ensure the effectiveness of the first information and the improvement of the system performance.

Optionally, when a network device (e.g., base station/gNB) configures and enables higher layer parameters (e.g., codeBlockGroupTransmsision) for a terminal device (e.g., UE), the UE may perform CBG-based transmission (i.e., send feedback information with CBG as granularity). For example, suppose that 1 TB contains N CBGs. The base station may configure granularity of the UE feedback first information through the fourth information. Suppose the fourth information is a higher layer parameter (e.g., may be an RRC parameter, pdschDecodingMessage ENUMERATED { CBG, TB }). In a possible implementation method, the base station may explicitly instruct the UE to send feedback information according to the TB granularity. In this case, the UE feeds back one feedback information corresponding to each TB. In another possible implementation method, the base station explicitly instructs the UE to perform the first information feedback with CBG as granularity. In this case, the UE needs to feed back the third information (HARQ-ACK information) corresponding to the N CBGs, and also needs to feed back the indication information (first information or second information) corresponding to the N CBGs, i.e., the N first information or second information.

In yet another possible implementation, the base station may instruct the UE to feedback the granularity of the first information through a higher layer parameter (RRC parameter), for example, the higher layer parameter may be PdschDecodingMessage enable { CBG }, and when the higher layer parameter is configured to be enabled, the UE transmits the feedback information with CBG as granularity. When the base station does not configure the higher layer parameters, the UE defaults to send feedback information with TB as granularity.

The specific feedback method is jointly designed by combining the CBG transmission scene and different feedback scenes of ACK or NACK, so that the UE can feed back corresponding first information according to the configuration condition of the base station on the CBG transmission and the decoding condition (correct decoding or incorrect decoding) of the received TB. The method is beneficial to optimizing the reporting mode of the first information aiming at different scenes, and further improves the effectiveness and the system performance of the first information.

Optionally, the terminal device may report a capability parameter to the network device, where the capability parameter is used to instruct the terminal device to support feedback of the first information or the second information. The network device may configure whether the UE feeds back the first information or the second information through RRC parameters.

704. The network device receives feedback information from the terminal device.

The feedback information may refer to the related description in step 703, which is not described herein.

Based on the method provided by the embodiment of the application, after the terminal equipment receives the PDSCH, the terminal equipment can send the indication information to the network equipment, and it should be understood that the content of the first indication can reflect the allowance of PDSCH decoding, and OLLA adjustment can be performed according to the allowance of PDSCH decoding. The content indicated by the second information may directly reflect an adjustment amount (e.g., SNR adjustment amount, SINR adjustment amount, CQI adjustment amount, or MCS adjustment amount) related to OLLA adjustment. In this way, different indication information is fed back to the network equipment, which is helpful for the network equipment to perform OLLA adjustment, accurately track the channel or interference and update the proper MCS, and can improve the decoding success rate and the spectrum utilization rate of new transmission and retransmission.

In the embodiments of the present application, the method provided in the embodiments of the present application is described in terms of the terminal device, the network device, and the interaction between the terminal device and the network device, respectively. In order to implement the functions in the method provided by the embodiment of the present application, the terminal device and the network device may include hardware structures and/or software modules, and implement the functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Some of the functions described above are performed in a hardware configuration, a software module, or a combination of hardware and software modules, depending on the specific application of the solution and design constraints.

Fig. 12 shows a possible structural schematic diagram of the apparatus 12 involved in the above embodiment in the case of dividing the respective functional modules with the respective functions, which may be a terminal device including: a receiving unit 1201 and a transmitting unit 1202. In the embodiment of the present application, a receiving unit 1201 is configured to receive a downlink physical shared channel PDSCH from a network device; a sending unit 1202, configured to send feedback information to a network device, where the feedback information includes indication information, and the indication information includes first information or second information; wherein, the first information is related to the average value of the decoding iteration times of the low density parity check code (LDPC) corresponding to the first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.

In the method embodiment shown in fig. 7, the receiving unit 1201 is configured to support the terminal device to perform the procedure 702 in fig. 7. The sending unit 1202 is configured to support the terminal device to perform the process 703 in fig. 7. All relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

Fig. 13 shows a possible structural schematic diagram of the apparatus 13 involved in the above embodiment, in the case of dividing the respective functional modules with the respective functions, which may be a network device including: a transmitting unit 1301 and a receiving unit 1302. In the embodiment of the present application, a transmitting unit 1301 is configured to transmit a downlink physical shared channel PDSCH to a terminal device; a receiving unit 1302, configured to receive feedback information from a terminal device, where the feedback information includes indication information, and the indication information includes first information or second information; wherein, the first information is related to the average value of the decoding iteration times of the low density parity check code (LDPC) corresponding to the first Code Block (CB); or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of first CBs; the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.

In the method embodiment shown in fig. 7, the transmitting unit 1301 is configured to support the terminal device to perform the procedure 701 in fig. 7. The receiving unit 1302 is configured to support the terminal device to perform the process 704 in fig. 7. All relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

For example, the terminal device or the network device in the above-described respective apparatus embodiments and the terminal device or the network device in the method embodiments may correspond completely, the respective steps are performed by respective modules or units, for example, the communication module (transceiver) may perform steps of transmitting and/or receiving in the method embodiments, and other steps than transmitting and receiving may be performed by a processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. The transmitting unit and the receiving unit can form a transmitting and receiving unit, the transmitter and the receiver can form a transceiver, and the transmitting and receiving functions are realized together; the processor may be one or more.

The functions of the terminal device or the network device may be implemented by a chip, and the processing unit may be implemented by hardware or software, and when implemented by hardware, the processing unit may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processing unit may be a general-purpose processor, implemented by reading software code stored in a memory unit, which may be integrated in the processor or located outside the processor, and independently present.

The terminal device or the network device in the above-mentioned respective apparatus embodiments and the terminal device or the network device in the method embodiments correspond completely, the respective steps are performed by respective modules or units, for example, the transmitting module (transmitter) performs the steps of transmitting in the method embodiments, the receiving module (receiver) performs the steps of receiving in the method embodiments, and other steps than transmitting and receiving may be performed by the processing module (processor). Reference may be made to corresponding method embodiments for the function of a particular module. The transmitting module and the receiving module can form a transmitting-receiving module, the transmitter and the receiver can form a transceiver, and the transmitting-receiving function is realized together; the processor may be one or more.

The division of the modules or units in the embodiments of the present application is schematically only one logic function division, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist separately and physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. Illustratively, in an embodiment of the present application, the receiving unit and the transmitting unit may be integrated into the transceiving unit.

The method provided by the embodiment of the application can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer 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 instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., solid state disk (solid state drives, SSD)), etc.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims and the equivalents thereof, the present application is also intended to include such modifications and variations.

Claims

A feedback information transmission method, comprising:

the terminal equipment receives a downlink physical shared channel PDSCH from the network equipment;

the terminal equipment sends feedback information to the network equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information;

wherein, the first information is related to the average value of the LDPC decoding iteration times corresponding to the first code block CB; or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of the first CBs;

the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.
The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first CB comprises all CBs in one transmission block TB, or a CB with correct decoding in one TB, or a CB with incorrect decoding in one TB; or alternatively

The first CB includes all CBs in one code block group CBG, or a CB in one CBG that decodes correctly, or a CB in one CBG that decodes incorrectly.
A method according to claim 1 or 2, characterized in that,

the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in one TB, or a first normalization value determined according to the average value and a preset LDPC decoding iteration time; or alternatively

The first information is used for indicating the maximum value of LDPC decoding iteration times corresponding to CB with correct decoding in one TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration times; or alternatively

The first information is used for indicating the number of the correct coded CBs in one TB, or a third normalization value determined according to the number of the correct coded CBs and the number of all CBs in one TB; or alternatively

The first information is used for indicating the number of the decoding error CBs in one TB or a fourth normalization value determined according to the number of the decoding error CBs and the number of all CBs in one TB.
The method of claim 3, wherein the feedback information further comprises third information, the third information comprising an acknowledgement ACK or a negative acknowledgement NACK,

when the third information includes ACK, the first information is configured to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in the one TB, and the first normalized value, a maximum value of the LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in the one TB, or any one of the second normalized values; the second information is used for indicating the first adjustment amount;

when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in the one TB, the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are correctly decoded in the one TB, the second normalized value, the number of CBs that are correctly decoded in the one TB, the third normalized value, the number of CBs that are incorrectly decoded in the one TB, or the fourth normalized value; the second information is used to indicate the first adjustment amount.
The method of claim 4, wherein the step of determining the position of the first electrode is performed,

The indication information and the third information are independently encoded; and the indication information and the third information are transmitted on the same Physical Uplink Control Channel (PUCCH), or the indication information and the third information are transmitted on different PUCCHs.
The method of claim 4, wherein the step of determining the position of the first electrode is performed,

the indication information is jointly encoded with the third information, and the indication information and the third information are transmitted on the same PUCCH.
The method according to any one of claims 3 to 6, wherein,

and under the condition that the terminal equipment is not configured with CBG, the first information is used for indicating any one of an average value of LDPC decoding iteration times corresponding to all CBs in the one TB, the first normalization value, a maximum value of LDPC decoding iteration times corresponding to the CBs with correct decoding in the one TB or the second normalization value.
The method of claim 4, wherein the step of determining the position of the first electrode is performed,

the terminal device is not configured with a CBG.
The method according to any one of claims 1 to 6, wherein,

and under the condition that the terminal equipment configures the CBG, the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in one CBG, a normalized value corresponding to the average value of LDPC decoding iteration times corresponding to all CBs in one CBG, a maximum value of LDPC decoding iteration times corresponding to all CBs in one CBG or a normalized value corresponding to the maximum value of LDPC decoding iteration times corresponding to all CBs in one CBG.
The method according to any one of claims 3 to 6, wherein,

under the condition that the terminal equipment configures CBG, the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in the one TB, the first normalization value, a maximum value of LDPC decoding iteration times corresponding to the CBs with correct decoding in the one TB or the second normalization value; the second information is used to indicate the first adjustment amount.
The method of claim 4, wherein the step of determining the position of the first electrode is performed,

and configuring CBG at the terminal equipment.
The method according to claim 9 or 10, wherein,

the terminal device receives fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level.
The method according to any one of claims 1-12, further comprising:

and the terminal equipment reports a capability parameter, wherein the capability parameter is used for indicating the terminal equipment to support feedback of the first information or the second information.
The method according to any one of claims 1 to 6, wherein,

When the terminal equipment is configured to feed back the first information and the terminal equipment is configured to perform CBG transmission, the terminal equipment performs TB-level data transmission; or alternatively

And when the terminal equipment is configured to feed back the first information, the terminal equipment is not configured to CBG transmission.
A feedback information transmission method, comprising:

the network equipment sends a downlink physical shared channel PDSCH to the terminal equipment;

the network equipment receives feedback information from the terminal equipment, wherein the feedback information comprises indication information, and the indication information comprises first information or second information;

wherein, the first information is related to the average value of the low density parity check code LDPC decoding iteration number corresponding to the first code block CB; or, the first information is related to the maximum value of the LDPC decoding iteration times corresponding to the first CB; alternatively, the first information is related to the number of the first CBs;

the second information is used for indicating a first adjustment amount, and the first adjustment amount comprises a signal-to-noise ratio (SNR) adjustment amount, a signal-to-interference-and-noise ratio (SINR) adjustment amount, a Channel Quality Indication (CQI) adjustment amount or a modulation and coding Mode (MCS) adjustment amount; the first adjustment amount is determined based on the first information.
The method of claim 15, wherein the step of determining the position of the probe is performed,

the first CB comprises all CBs in one transmission block TB, or a CB with correct decoding in one TB, or a CB with incorrect decoding in one TB; or alternatively

The first CB includes all CBs in one code block group CBG, or a CB in one CBG that decodes correctly, or a CB in one CBG that decodes incorrectly.
The method according to claim 15 or 16, wherein,

the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in one TB, or a first normalization value determined according to the average value and a preset LDPC decoding iteration time; or alternatively

The first information is used for indicating the maximum value of LDPC decoding iteration times corresponding to CB with correct decoding in one TB, or a second normalization value determined according to the maximum value and the preset LDPC decoding iteration times; or alternatively

The first information is used for indicating the number of the correct coded CBs in one TB, or a third normalization value determined according to the number of the correct coded CBs and the number of all CBs in one TB; or alternatively

The first information is used for indicating the number of the decoding error CBs in one TB or a fourth normalization value determined according to the number of the decoding error CBs and the number of all CBs in one TB.
The method of claim 17, wherein the feedback information further comprises third information, the third information comprising an acknowledgement ACK or a negative acknowledgement NACK,

when the third information includes ACK, the first information is configured to indicate an average value of LDPC decoding iteration numbers corresponding to all CBs in the one TB, and the first normalized value, a maximum value of the LDPC decoding iteration numbers corresponding to CBs that are decoded correctly in the one TB, or any one of the second normalized values; the second information is used for indicating the first adjustment amount;

when the third information includes NACK, the first information is used to indicate any one of an average value of LDPC decoding iteration numbers corresponding to all CBs in the one TB, the first normalized value, a maximum value of LDPC decoding iteration numbers corresponding to CBs that are correctly decoded in the one TB, the second normalized value, the number of CBs that are correctly decoded in the one TB, the third normalized value, the number of CBs that are incorrectly decoded in the one TB, or the fourth normalized value; the second information is used to indicate the first adjustment amount.
The method of claim 18, wherein the step of providing the first information comprises,

The indication information and the third information are independently encoded; and the indication information and the third information are transmitted on the same Physical Uplink Control Channel (PUCCH), or the indication information and the third information are transmitted on different PUCCHs.
The method of claim 18, wherein the step of providing the first information comprises,

the indication information is jointly encoded with the third information, and the indication information and the third information are transmitted on the same PUCCH.
The method according to any one of claims 17 to 20, wherein,

and under the condition that the terminal equipment is not configured with CBG, the first information is used for indicating any one of an average value of LDPC decoding iteration times corresponding to all CBs in the one TB, the first normalization value, a maximum value of LDPC decoding iteration times corresponding to the CBs with correct decoding in the one TB or the second normalization value.
The method of claim 18, wherein the step of providing the first information comprises,

the terminal device is not configured with a CBG.
The method according to any one of claims 15-20, wherein,

and under the condition that the terminal equipment configures the CBG, the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in one CBG, a normalized value corresponding to the average value of LDPC decoding iteration times corresponding to all CBs in one CBG, a maximum value of LDPC decoding iteration times corresponding to all CBs in one CBG or a normalized value corresponding to the maximum value of LDPC decoding iteration times corresponding to all CBs in one CBG.
The method according to any one of claims 17 to 20, wherein,

under the condition that the terminal equipment configures CBG, the first information is used for indicating an average value of LDPC decoding iteration times corresponding to all CBs in the one TB, the first normalization value, a maximum value of LDPC decoding iteration times corresponding to the CBs with correct decoding in the one TB or the second normalization value; the second information is used to indicate the first adjustment amount.
The method of claim 18, wherein the step of providing the first information comprises,

and configuring CBG at the terminal equipment.
The method according to claim 23 or 24, wherein,

the network device sends fourth information, where the fourth information is used to instruct the terminal device to feed back granularity of the first information or the second information, and the granularity may be a TB level or a CBG level.
The method according to any one of claims 15-26, further comprising:

the network device receives a capability parameter from the terminal device, where the capability parameter is used to indicate that the terminal device supports feedback of the first information or the second information.
A communication device comprising means for performing the feedback information transmission method of any of claims 1-14 or claims 15-27.
A communication device comprising a processor coupled to a memory;

the memory is configured to store computer-executable instructions that, when executed by the communication device, cause the communication device to perform the feedback information transfer method of any of claims 1-14 or claims 15-27.
A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the feedback information transfer method of any of claims 1-14 or claims 15-27.
A system on a chip comprising a processor coupled to a memory, the processor executing computer-executable instructions stored in the memory to implement the feedback information transfer method of any of claims 1-14 or claims 15-27.
A communication system is characterized by comprising a terminal device and a network device,

the terminal device is configured to perform the feedback information transmission method according to any one of claims 1-14, and the network device is configured to perform the feedback information transmission method according to any one of claims 15-27.