WO2017167004A1

WO2017167004A1 - Feedback method for performing clear channel assessment, device, and computer storage medium

Info

Publication number: WO2017167004A1
Application number: PCT/CN2017/076511
Authority: WO
Inventors: 苟伟; 赵亚军; 彭佛才; 李新彩
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-31
Filing date: 2017-03-13
Publication date: 2017-10-05
Also published as: CN107295677A; CN107295677B

Abstract

The disclosure provides a feedback method for performing a clear channel assessment (CCA), a device, and a computer storage medium. The feedback method comprises: when user equipment (UE) is scheduled to transmit, at an n^th subframe on an unlicensed carrier, uplink data, performing, prior to transmitting the uplink data, a CCA detection, wherein n is a natural number; and feeding back to a base station a detection result of the CCA detection.

Description

Feedback method and device for performing idle channel evaluation, computer storage medium

Technical field

The present disclosure relates to the field of communications, and in particular to a feedback method and apparatus for performing idle channel assessment, and a computer storage medium.

Background technique

In the related art, the communication network of Long Term Evolution (LTE) is deployed in the licensed carrier. With the development of LTE, some companies have proposed to study the deployment of LTE in unlicensed carriers. The subject of the company, for example, Qualcomm in the United States believes that with the rapid growth of data services, in the near future, authorized carriers will not be able to withstand the huge amount of data brought by rapid business growth. Considering that LTE is deployed in an unlicensed carrier to share the data traffic in the authorized carrier, the data volume pressure brought by the service growth can be solved. At the same time, the unlicensed carrier has the following characteristics: on the one hand, since the unlicensed carrier does not need to be purchased, or the carrier resource is zero cost, the unlicensed carrier is free or low-cost; on the other hand, since the individual and the enterprise can participate in the deployment, the device The quotient equipment is also available, so the admission requirements of the unlicensed carrier are low; in addition, the unlicensed carrier is shared, and some sharing can be considered when multiple different systems are operating at the same time or when different operators of the same system operate. The way resources are used to improve carrier efficiency.

In summary, although LTE deployment has obvious advantages in unlicensed carriers, there are still problems in the process of deployment; among them, there are many wireless access technologies (cross-communication standards, difficult collaboration, and diverse network topologies) ) and many wireless access sites (large number of users, difficult collaboration, centralized management overhead). Due to the large number of wireless access technologies, there will be various wireless systems in the unlicensed carrier, which are difficult to coordinate with each other and have serious interference. Therefore, for LTE deployed in unlicensed carriers, there is still a need to support the regulation of unlicensed carriers. Most countries require systems to be non-compliant. When deploying in an authorized carrier, you need to support the mechanism of listening first. By listening to the mechanism first, it is possible to avoid interference caused by the simultaneous use of unlicensed carriers between adjacent systems. And the competition back-off mechanism is further introduced, that is, the neighboring system sites (generally the neighboring transmission nodes of the same system) can avoid the interference caused by the neighboring transmission nodes of the same system simultaneously using the unlicensed carriers through the contention back-off mechanism. In addition, the regulations stipulate that the device that uses the unlicensed carrier (including the base station and the user equipment (User Equipment, UE for short)) needs to perform the mechanism of listening before and after the transmission. (Clear Channel Assessment, referred to as CCA), also known as (Listen Before Talk, LBT for short), when the channel is idle, the device can use the unlicensed carrier channel for data transmission.

Hybrid Automatic Repeat ReQuest (HARQ) is a combination of Forward Error Correction (FEC) and Automatic Repeat-ReQuest (ARQ). Hybrid automatic repeat request, that is, hybrid ARQ (Hybird ARQ). The basic principles of HARQ are as follows:

The FEC technique is used at the receiving end to correct the part of all errors that can be corrected.

It is judged by error detection that the wrong packet cannot be corrected.

Discard the uncorrectable packets and request the sender to resend the same packet.

In the LTE system, HARQ is supported and one of the most important features of the LTE system improves the reliability of data transmission. However, in an unlicensed carrier or a licensed Assisted Access (LAA) system (LAA system, that is, a system in which LTE is deployed on an unlicensed carrier, or a system in which an unlicensed carrier uses LTE technology) , HARQ faces new problems.

In the LAA system, during uplink transmission, the UE needs to perform CCA detection channel idle before the UE actually performs transmission after the scheduled transmission. When the channel is idle, the UE can complete the corresponding data transmission according to the previous scheduling. However, if the UE fails to perform CCA, the base station does not know whether the UE sends the corresponding uplink data according to the previous scheduling. When you are born in the process of retransmission, the following effects may occur. First, the number of times the UE actually retransmits is lower than the number of expected retransmissions specified by the standard, which ultimately leads to a decrease in the performance of HARQ retransmission. Second, when HARQ merges, invalid data may be merged, affecting the performance of HARQ merge.

In view of the above problems in the related art, no effective solution has been found yet.

Public content

Embodiments of the present disclosure provide a feedback method and apparatus for performing idle channel estimation, and a computer storage medium to at least solve the problem that the related art is degraded in the LAA system due to CCA failure.

According to an aspect of an embodiment of the present disclosure, there is provided a feedback method for performing idle channel estimation, including: when a UE is scheduled to transmit uplink data in an nth subframe of an unlicensed carrier, before transmitting the uplink data, performing CCA detection, wherein the n is a natural number; and the detection result of the CCA detection is fed back to the base station.

In an embodiment of the present disclosure, the detection result includes one of the following: success, failure, and feeding back the detection result of the CCA detection to the base station, at least one of the following manners: when the CCA detection fails, the The detection result is sent to the base station through a Physical Uplink Control Channel (PUCCH), or the uplink control information is sent in the Physical Uplink Shared Channel (PUSCH). The information of the Control Information (referred to as UCI) is sent to the base station; when the CCA detection is successful, the detection result is sent to the base station through the PUCCH, or the detection result is sent to the base station through the resource of the UCI sent in the PUSCH; When the CCA detection succeeds or fails, the detection result is sent to the base station through the PUCCH, or the detection result is sent to the base station by using the resource for transmitting the UCI in the PUSCH.

In an embodiment of the present disclosure, when the CCA detection fails, the detection result is sent to the base station by using a PUCCH resource, including: sending the detection result by using PUCCH format 1. And sending the detection result to the base station by using the PUCCH resource, where the detection result is sent to the base station by using the PUCCH format 1; wherein the PUCCH format 1 includes At least one of the following: the same coding mode, time domain resource allocation mode, frequency domain resource allocation mode, code domain resource allocation mode, and mapping transmission mode as the PUCCH format 1.

In an embodiment of the present disclosure, when the CCA detection succeeds or fails, the detection result is sent to the base station by using the PUCCH resource, and the method includes: sending the detection result to the base station by using a PUCCH format 1a; wherein the PUCCH The format 1a includes at least one of the following: an encoding method identical to the PUCCH format 1a, a time domain resource allocation method, a frequency domain resource allocation method, a code domain resource allocation method, and a mapping transmission method.

In an embodiment of the present disclosure, the PUCCH format 1 or PUCCH is allocated to the detection result and the success acknowledgment/failure acknowledgment (ACK/NACK) or the scheduling request (Scheduling Request, SR for short) in a manner agreed by the base station and the UE. Resource index of format 1a

Or the physical downlink control channel (Physical Downlink Control Channel, hereinafter referred to as PDCCH) of the uplink grant information carried in the nk subframe or the control channel element (CCE, Control Channel Element) of the enhanced PDCCH in the manner agreed by the base station and the UE The CCE with the smallest index number is used to estimate the resource index in which the UE in the nth subframe feeds back the detection result.

Value;

For the resource index of the PUCCH format 1 or 1a, the k is the number of interval subframes of the uplink grant information transmission subframe and the corresponding uplink data transmission subframe.

In an embodiment of the present disclosure, the

Deriving the time domain, frequency domain, and code domain resources of the detection result by the UE according to the protocol LTE TS 36.211 vd00.

In an embodiment of the present disclosure, the feeding back the detection result of the CCA detection to the base station includes: a subframe corresponding to the nth subframe or a first subframe subsequent to a corresponding subframe in an authorized carrier The detection result of the CCA detection is fed back to the base station.

In an embodiment of the present disclosure, the subframe corresponding to the nth subframe in the authorized carrier When the downlink subframe is a subframe, the detection result of the CCA detection is fed back to the base station in the first uplink subframe after the subframe corresponding to the subframe in the nth subframe in a manner agreed by the base station and the UE, and Or, in the nth subframe, when the first subframe after the corresponding subframe in the authorized carrier is a downlink subframe, the corresponding subframe in the nth subframe is in the authorized carrier by a manner agreed by the base station and the UE. The detection result of the CCA detection is fed back to the base station in the first uplink subframe after the first subframe after the subframe.

In an embodiment of the present disclosure, the base station and the UE agree to feed back the detection result of the CCA detection to the first uplink subframe after n subframes or the second uplink subframe after n subframes. In the case of the base station, the detection result further includes the number of CCA failures or successes accumulated by the UE.

In an embodiment of the present disclosure, when the base station transmits the PDCCH or the enhanced PDCCH of the uplink grant information in the nkth subframe, the nth or n+th of the primary carrier in the UE is agreed by the base station and the UE. The detection result is fed back to the base station in one subframe, where the k is the number of interval subframes of the uplink grant information transmission subframe and the corresponding uplink data transmission subframe.

In an embodiment of the present disclosure, when the detection result is a failure, the UE may not send the nth subframe of the uplink data according to the uplink grant information, and the UE considers the retransmission to be invalid, and the number of times of retransmission Exclude the count from the actual number of retransmissions.

In an embodiment of the present disclosure, when the base station receives the CCA detection result corresponding to the nth subframe and fails, or the base station learns that the UE fails the CCA detection according to the CCA detection result fed back by the UE, the base station will The number of retransmissions is excluded from the actual retransmission count result.

In an embodiment of the present disclosure, when the base station receives the CCA detection result corresponding to the nth subframe and fails, or the base station learns that the UE fails to receive the CCA detection according to the CCA detection result fed back by the UE, the base station receives the CCA detection result. The signal abandons the HARQ combining of the uplink data.

According to another aspect of an embodiment of the present disclosure, there is provided a feedback apparatus for performing idle channel estimation, comprising: a detecting module configured to transmit in an nth subframe in which an UE is scheduled to be in an unlicensed carrier When the uplink data is sent, the CCA detection is performed before the uplink data is sent, where the n is a natural number, and the feedback module is configured to feed back the detection result of the CCA detection to the base station.

In an embodiment of the present disclosure, the detection result includes one of the following: success, failure, and the feedback module includes: a first feedback unit configured to send the detection result to the base station through the PUCCH when the CCA detection fails Or, the detection result is sent to the base station by using the resource for transmitting the UCI in the PUSCH, and the second feedback unit is configured to send the detection result to the base station by using the PUCCH when the CCA detection is successful, or The detection result is sent to the base station by using the resource for transmitting the UCI in the PUSCH, and the third feedback unit is configured to send the detection result to the base station through the PUCCH when the CCA detection succeeds or fails, or pass the detection result to the PUSCH. The resource in which the UCI is transmitted is sent to the base station.

According to another aspect of an embodiment of the present disclosure, there is provided a computer storage medium storing a computer program configured to perform the above-described feedback method of performing idle channel estimation.

When the uplink data is sent by the UE in the nth subframe, the CCA detection is performed before the uplink data is sent, and the detection result of the CCA detection is fed back to the base station by using the technical solution in the embodiment of the present disclosure. The problem that the related art is degraded due to the failure of the CCA in the LAA system is solved, so that the base station can clearly know whether the scheduled UE sends the corresponding uplink data in the corresponding subframe, so that the base station can clear the current time. Whether the received data is valid data, so that the base station can avoid the use of the received data, and the invalid data is prevented from participating in the HARQ merging during the retransmission, and the actual number of HARQ retransmissions is not affected by the CCA detection failure, thereby improving. The effect of data transmission efficiency.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present disclosure, which is a part of the present disclosure, and the description of the present disclosure and the description thereof are not intended to limit the disclosure. In the drawing:

1 is a flowchart of a feedback method of performing idle channel estimation, in accordance with an embodiment of the present disclosure;

2 is a structural block diagram of a feedback device performing idle channel estimation according to an embodiment of the present disclosure;

3 is an optional structural block diagram of a feedback device that performs idle channel estimation, in accordance with an embodiment of the present disclosure;

4 is a schematic diagram of feedback of detection results according to Embodiment 1 of the present disclosure;

5 is a schematic diagram of feedback of detection results based on a TDD mode according to Embodiment 3 of the present disclosure;

6 is a basic processing flow of a base station side according to an alternative embodiment of the present disclosure;

FIG. 7 is a flow diagram of a UE-side basic process according to an alternative embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a feedback method for performing idle channel estimation is provided. FIG. 1 is a flowchart of a method for performing feedback of idle channel estimation according to an embodiment of the present disclosure. As shown in FIG. 1, the flow includes the following steps:

Step S102: When the UE is scheduled to send uplink data in the nth subframe of the unlicensed carrier, perform CCA detection before sending the uplink data, where n is a natural number;

In step S104, the detection result of the CCA detection is fed back to the base station.

Through the above steps, when the UE is scheduled to send the uplink data in the nth subframe, before the uplink data is sent, the CCA detection is performed, and the detection result of the CCA detection is fed back to the base station, and the related technology is solved in the LAA system. The CCA failure causes the terminal to retransmit the performance degradation problem, so that the base station can clearly know whether the scheduled UE sends the corresponding uplink data in the corresponding subframe, so that the base station can clear whether the data received this time is valid data, Facilitating the use of the received data by the base station, the invalid data is prevented from participating in the HARQ merging during the retransmission, and the actual number of HARQ retransmissions is not affected by the CCA detection failure, thereby achieving the effect of improving the data transmission efficiency.

In this implementation, the nth subframe, that is, the subframe n, corresponding to the first subframe after the nth subframe described below, that is, the subframe n+1, and so on.

Optionally, feeding back the detection result of the CCA detection to the base station includes at least the following methods:

Mode 1, when the UE is scheduled to transmit uplink data in the subframe n, the UE performs CCA detection before the uplink data transmission, and if the CCA detection fails (ie, the UE cannot use the unlicensed carrier to transmit data), the UE performs the CCA detection result. Send to the base station. If the CCA detection is successful (ie, the UE can use the unlicensed carrier to transmit data), the UE does not send the CCA detection result information to the base station. When the base station does not receive the CCA detection result feedback information of the UE in the corresponding subframe, the base station considers that the UE CCA detection is successful, and the corresponding uplink data has been sent. If the base station receives the CCA detection result sent by the UE as a failure, the base station considers that the UE does not send the corresponding uplink data.

Mode 2: When the UE is scheduled to send uplink data in the subframe n, the UE performs CCA detection before the uplink data transmission. If the CCA detection is successful, the UE sends the CCA detection result to the base station. If the CCA detection fails, the UE does not send the CCA detection result information to the base station. When the base station does not receive the CCA detection result feedback information of the UE in the corresponding subframe, the base station considers that the UE CCA detection fails, and does not send the corresponding uplink data.

Mode 3: When the UE is scheduled to transmit uplink data in the subframe n, the UE performs CCA detection before the uplink data transmission, and the UE sends the CCA detection result to the base station. The test results include: successful detection and failure of detection. If the base station receives the CCA detection result sent by the UE as the detection success, the base station considers that the UE CCA detection is successful, and the UE has sent the corresponding uplink data. If the base station receives the CCA detection result sent by the UE as the detection failure, the base station considers that the UE CCA detection fails, and considers that the UE does not send the corresponding uplink data.

In this embodiment, the detection result may be, but is not limited to, detection success, detection failure. In Specifically, when the foregoing detection result is sent to the base station, the method may be sent to the base station by using the PUCCH, or the detection result may be sent to the base station by using the resource for transmitting the UCI in the PUSCH.

Optionally, in the mode 1, the base station and the UE agree to feed back the CCA failure by using the uplink PUCCH format 1, or the base station and the UE in the mode 2 agree to feed back the CCA by using the uplink PUCCH format 1. In mode 3, the base station and the UE agree to feed back the result of the CCA detection by using the uplink PUCCH format 1a.

In an optional embodiment manner according to this embodiment, the base station sends a PUCCH format 1 or a format 1a for the UE to determine a resource index different from other UEs or different ACK/NACKs.

among them

According to the CCE minimum index of the corresponding scheduling information (that is, the PDCCH that sends the uplink grant information), the specific estimation is consistent with the existing LTE protocol. Where p ∈ [p ₀ , p ₁ ], p represents the antenna port, including ports 0 and 1.

The mapping to port p is PUCCH format 1a. among them,

n _CCE indicates the minimum CCE index in the corresponding PDCCH,

Configured for high level signals. Or, the base station determines different UEs by different minimum CCE indexes of DCIs configured for different UEs.

Different, wherein the base station and the UE determine the corresponding according to the minimum CCE index of the scheduled DCI information.

In an embodiment of the present disclosure, the base station and the UE are configured according to

The rules for calculating the corresponding receiving and transmitting resources are the same as those of the LTE protocol 36.211 vd00.

In an optional embodiment manner of the present embodiment, the UE sends the feedback information in the manners 1, 2, and 3 in the subframe corresponding to the subframe n or the first subframe after the corresponding subframe in the authorized carrier. .

In an optional embodiment manner of the present embodiment, when the subframe n is the corresponding subframe in the authorized carrier or the first subframe after the corresponding subframe is the downlink subframe, the base station and the UE agree to extend to the first The uplink subframes are fed back. Especially in the scenario where the primary carrier is Time Division Duplexing (TDD), the TDD scenario will be described below. When the delay occurs, the base station and the UE agree that the UE that is fed back in mode 1 or mode 2 is the accumulated CCA. The number of failures or successes. When the base station sends the PDCCH of the uplink grant information in the subframe nk, the base station and the UE agree that the UE is in the subframe n or n+1, and transmits the CCA detection before the UE sends the uplink data in the subframe n in the primary carrier. Happening.

In an alternative embodiment manner of the present embodiment, when the UE determines that the data of the subframe n cannot be transmitted because the corresponding CCA detection fails, the UE considers that the retransmission is invalid, and the UE does not The number of retransmissions is calculated within the actual number of retransmissions. Or, when the base station learns that the data of the UE in the subframe n is not transmitted because the corresponding CCA detection fails, the base station considers that the retransmission is invalid, and the base station and the UE do not calculate the number of retransmissions in the actual required weight. Within the number of passes.

In an alternative embodiment manner according to the present embodiment, when the base station learns that the data of the UE in the subframe n is not transmitted, the base station does not perform HARQ combining on the received signal because the corresponding CCA detection fails.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, portions of the technical solutions of the present disclosure that contribute substantially or to the prior art may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present disclosure.

A feedback device for performing the evaluation of the idle channel is also provided in the embodiment, and the device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

2 is a structural block diagram of a feedback apparatus that performs idle channel estimation according to an embodiment of the present disclosure. As shown in FIG. 2, the apparatus includes:

The detecting module 20 is configured to perform CCA detection, where n is a natural number, before sending the uplink data, when the UE is scheduled to send uplink data in the nth subframe of the unlicensed carrier;

The feedback module 22 is configured to feed back the detection result of the CCA detection to the base station.

FIG. 3 is an optional structural block diagram of a feedback apparatus for performing idle channel estimation according to an embodiment of the present disclosure. As shown in FIG. 3, the apparatus includes, in addition to all the modules shown in FIG. 2, the feedback module 22 further includes:

The first feedback unit 30 is configured to send the detection result to the base station through the PUCCH when the CCA detection fails, or send the detection result to the base station by using the resource for transmitting the UCI in the PUSCH;

The second feedback unit 32 is configured to send the detection result to the base station through the PUCCH when the CCA detection is successful, or send the detection result to the base station by using the resource for transmitting the UCI in the PUSCH;

The third feedback unit 34 is configured to send the detection result to the base station through the PUCCH when the CCA detection succeeds or fails, or send the detection result to the base station by using the resource for transmitting the UCI in the PUSCH.

It should be noted that the first feedback unit 30, the second feedback unit 32, and the third feedback unit 34 may be simultaneously disposed in the feedback module 22, or one or more of them may be disposed in the feedback module 22.

Detailed and detailed description will be made below in conjunction with alternative embodiments in accordance with the present disclosure:

Includes the following options:

Solution 1: When the UE is scheduled to be transmitted in the unlicensed carrier, the UE feeds back the information detected by the CCA before the scheduled data, including: the CCA fails, or the CCA succeeds. Specifically, the feedback is performed through the PUCCH, including: using ACK/NACK to perform the above feedback, and the authorized carrier or the Unlicensed carrier.

Solution 2: The UE feeds back the information of the CCA failure before the scheduled data transmission. When the base station receives the information, it considers that the retransmitted data is not transmitted, and the base station will not receive the received data. Perform HARQ merging.

Solution 3: The UE feeds back the CCA failure information before the scheduled data transmission, and the base station and the UE stipulate that the number of retransmissions due to the CCA failure is removed from the configured number of UE retransmissions, so that the actual retransmission times satisfy the configuration. Requirements. For example, the number of retransmissions configured is not counted.

Example 1

Corresponding to 1, a method for reporting a feedback CCA detection situation of the UE and the base station is described. FIG. 4 is a schematic diagram of feedback of detection results according to Embodiment 1 of the present disclosure. As shown in FIG. 4, the detection result is fed back in the nth uplink subframe.

When the base station and the UE agree to feed back the CCA detection situation, specifically, the corresponding feedback is performed when the CCA detection fails. Then the PUCCH format 1 in the existing LTE system is used. The existing PUCCH format 1 is used for transmitting an SR, and the base station determines whether there is an SR request for transmission only by means of energy detection.

If PUCCH format 1 is used to send CCA detection failure, then the UE sends a corresponding feedback signal when the CCA detection fails. The feedback signal here is the same as the SR request, but the transmitted code resources are different (including the transmitted time-frequency domain resources). And so on, obtaining a code resource for transmitting PUCCH format 1 according to the UE-specific RRC message. Preferably, for the case of CCA detection, the sending period of the SR request is 1 ms or 2 ms, which is convenient for the UE to have available SR resources.

For example, for a UE scheduled to be in an unlicensed carrier, the corresponding SR request period is configured to be 1 ms, and the corresponding SR request resource is sent through a dedicated RRC message. Then, when the UE fails to detect the corresponding CCA in the subframe n, the CSA detection failure is sent using the SR request resource. When the base station detects the SR request signal on the SR resource corresponding to the subframe n authorized carrier, it indicates that the UE fails to detect the CCA in the subframe n.

Obviously, this method is suitable for the case where the unlicensed carrier does not support the real SR request, or the case where the UE does not allow the SR request to be sent in the unlicensed carrier. If the unlicensed carrier supports sending the SR request, it will cause the actual SR request to conflict with the CCA detection failure.

In order to avoid this latter situation. The optimization scheme is given below:

The base station adds the resource configuration information that is sent to the CCA detection failure information in the UE-specific RRC message, so that the resource configuration information of the actual SR request and the resource of the CCA detection failure information are separately configured, so that the SR request and the CCA detection failure information are the same. Sending in a sub-frame is also easy to distinguish due to different code resources.

Also, the subframe period of the resource of the CCA detection failure information may be configured to be 1 ms or 2 ms. That is, the subframe period of the SR request and the subframe period of the resource of the CCA detection failure information are respectively configured.

The corresponding UE feedback CCA detection success information may also be applicable.

Example 2

Corresponding to Mode 3, a method for reporting a feedback CCA detection condition of the UE and the base station is described.

When the base station and the UE agree to feed back the CCA detection situation, specifically, the UE feeds back 1 when the CCA detection fails, and the UE feeds back 0 when the CCA detection is successful. The opposite is also possible. 1 or 0 uses the encoding and transmission method of PUCCH format 1a. This kind of feedback can correspond to the PUCCH format 1a in the existing LTE system. Currently, the format 1a is used to feedback whether the UE correctly receives the downlink data.

The base station and the UE stipulate that the UE scheduled by the base station in the unlicensed carrier is configured with feedback resources for feeding back CCA detection failure/success information in the subframe n of the authorized carrier corresponding to the corresponding uplink subframe n. When the UE performs CCA detection before the corresponding uplink subframe transmits data according to the scheduling of the base station, if the channel detection fails/success, the UE sends a CCA detection failure or success information to the base station in the corresponding subframe of the authorized carrier.

The coding and resource determination of the CCA detection failure or success information is performed in accordance with 5.4 of the LTE protocol 36.211 vd00.

The section 5.4 requires a parameter in the process of resource determination.

The parameter is calculated according to the CCE minimum index of the corresponding scheduling information (that is, the PDCCH that sends the uplink grant information), and the specific estimation is consistent with the existing LTE protocol. Where p ∈ [p ₀ , p ₁ ], p represents the antenna port, including ports 0 and 1.

The mapping to port p is PUCCH format 1a. among them,

n _CCE indicates the minimum CCE index in the corresponding PDCCH,

Configured for high level signals. For details, refer to section 10.1.2.1 of the 36.213vd00 protocol.

The base station and the UE calculate resources of the received and transmitted CCA failure/success information according to the manner agreed above.

In order to avoid collision with the actual ACK/NACK feedback, the base station needs to configure the actual ACK/NACK physical resource or code resource different from the CCA detection failure/successful physical resource or code resource. Specifically, the minimum index value of the CCE when the respective PDCCH is transmitted may be different.

In this embodiment, the resources (including the time domain, the frequency domain, and the code resource) used for the CCA detection result transmission may also be allocated to the UE by using the high layer signaling, for example, using the RRC message dedicated by the UE.

Example 3

Based on Embodiments 1 and 2, when the primary carrier or the licensed carrier is in the TDD mode, FIG. 5 is a schematic diagram of the detection result feedback based on the TDD mode according to Embodiment 3 of the present disclosure, as shown in FIG. 5, in the (n+1)th uplink subframe. Feedback test results. At this time, the subframe corresponding to the subframe n (the subframe in which the uplink data is transmitted and the CCA is sent before the transmission) in the primary carrier may be the downlink, and the UE cannot send the CCA detection result, and the subframe needs to be extended in the primary carrier. The first uplink subframe can send the CCA detection result, which may cause the problem of missed feedback timing.

If the delay occurs, the base station needs to reserve resources according to the manner in the subframe n in the first uplink subframe after the UE, and the UE still reports the resources reported according to the CCA detection result in the subframe n. The source transmits the CCA detection result in the first uplink subframe after the said.

If the delay occurs, preferably, the base station and the UE need to agree on the maximum delay time, and if the maximum delay time is exceeded, the feedback is no longer performed.

If the delay occurs, preferably, the base station and the UE agree that the UE feeds back the CCA detection result to the CCA detection feedback result of multiple times. The base station and the UE agree that the first CCA detection result is transmitted in the first uplink subframe after the same resource in the subframe n, and the second CCA detection result is used after the first CCA detection result. Immediate resources, and so on.

If the delay occurs, preferably, the number of times the base station and the UE are scheduled to feedback the cumulative CCA detection failure or success.

For the case where the primary carrier is in the TDD mode, the base station preferably calculates, in advance, when the UE scheduling the unlicensed carrier transmits the uplink data, the subframe in which the scheduled UE transmits the uplink data in the unlicensed carrier corresponds to the uplink subframe of the primary carrier. Because the uplink and downlink subframe configuration of the TDD mode is fixed, and the LAA carrier is aligned with the primary carrier subframe, the interval between the transmission of the uplink grant information (the information of the scheduled UE) and the transmission of the uplink data is fixed or configurable, so The base station can easily determine the subframe in which the uplink grant information is sent. After the interval is k subframes, whether the subframe in which the corresponding uplink data is transmitted is the uplink subframe in the primary carrier.

Example 4

After the base station receives the CCA detection result that is sent by the UE, the base station processes the following manner. FIG. 6 is a flowchart of the base station side processing according to an alternative embodiment of the present disclosure.

S601, in the subframe n-k, send the uplink grant information for the LAA carrier to the UE through the PDCCH (or ePDCCH) of the primary carrier or the LAA carrier;

S602. Receive a CCA detection result reported by the UE.

S603. Receive uplink data that the UE may send according to the uplink authorization information.

S604. Determine, according to the CCA detection result, a subsequent process (including whether to retransmit, whether the received data is valid, whether the actual number of retransmissions is counted, and whether it is merged with the previously received data).

The LAA carrier (unlicensed carrier) and the authorized carrier operate in a carrier aggregation manner, and the subframes are aligned.

The base station transmits the uplink grant information in the subframe nk (k is a positive integer) through the primary carrier (the authorized carrier) or the PDCCH of the LAA carrier (or the enhanced PDCCH, ie, the ePDCCH, the same below), and the subframe n of the unlicensed carrier is scheduled by the UE. In the uplink data transmission. The base station receives the possible uplink data in the subframe n of the unlicensed carrier, and receives the CCA detection result before transmitting the uplink data in the subframe n for the unlicensed carrier reported by the UE in the subframe corresponding to the primary carrier.

When the base station receives the failure to send the uplink data in the subframe n for the unlicensed carrier, the base station considers that the CCA detection result is a failure (the CCA detection result is that the channel is not idle), the base station considers that the UE is not in the subframe n. The scheduled data is sent. The base station can discard the received uplink data. It is considered that this retransmission is invalid and is not counted as the actual number of retransmissions. The base station also does not perform HARQ combining on the received uplink data with the previously received uplink data.

When the base station receives the CCA detection result reported by the UE as successful (the CCA detection result is the channel idle), the base station considers that the UE sends the uplink data according to the uplink grant information. It is considered that the received uplink data is valid data, and the current retransmission is included in the actual number of retransmissions.

For the different CCA result feedback modes described above, the processing situation of the base station is different. If the UE sends the CCA detection result only when the CCA fails, the base station receives the CCA detection result, and then considers that the UE cannot send the uplink data according to the uplink authorization information. If the base station does not receive the CCA detection failure information (because the UE CCA detection is successful and the CCA detection result is not sent, the base station does not receive the information), the base station considers that the UE sends the uplink data according to the uplink authorization information.

The processing principle is similar for the result that the UE only feeds back the CCA detection success, and details are not described herein again.

For the case that the UE not only feeds back the information that the CCA detection fails, but also feeds back the information that the CCA detects success, the base station directly judges according to the received feedback information.

Example 5

FIG. 7 is a flowchart of UE side processing for illustrating UE behavior in the present disclosure, according to an alternative embodiment of the present disclosure, as shown in FIG. 7 :

S701. Receive, in a subframe n-k, uplink grant information for a LAA carrier sent by a base station by using a PDCCH (or ePDCCH).

S702. Perform CCA detection before sending data in the subframe n according to the uplink grant information.

S703, reporting the detection result of the CCA detection;

S704. Determine, according to the CCA detection result, whether to continue to send uplink data in the subframe n according to the PDCCH.

The UE receives the PDCCH (or ePDCCH) in the subframe n-k of the primary carrier or the LAA carrier to obtain uplink grant information, and determines to send uplink data in the subframe n of the LAA carrier according to the uplink grant information.

The UE performs the CCA detection before the uplink data is sent in the subframe n of the LAA carrier. If the channel is idle, the UE sends the corresponding uplink data according to the uplink grant information, and the UE simultaneously sends the CCA detection result to the base station. 2, 3 different, the UE sends CCA detection results differently). If the channel is non-idle, the UE abandons the uplink data transmission in the subframe n, and the UE simultaneously sends the CCA detection result to the base station (the behavior of the CCA detection result of the UE is different according to the foregoing manners 1, 2, and 3), The UE considers that this scheduling or retransmission is invalid and does not count the actual number of retransmissions.

Example 6

As the number of LAA carriers simultaneously aggregated by the UE increases, for example, 4 LAA carriers are typical, currently, according to the LTE protocol, a maximum of 32 carrier aggregations are supported, if the LAA carriers are at most 31, and the carriers are in the same subframe. When the location is scheduled to send uplink data, then the UE needs to perform CCA on each carrier separately. How to simultaneously feed back the CCA detection result of each carrier? This embodiment gives a method.

Utilize the transmission mechanism of UCI in the existing LTE system, including different PUCCH formats Equations 1b, 2, 2a, 2b, 3 and subsequent possible addition of formats) and transmission mechanisms for transmitting UCI (uplink control information) through the PUSCH. It may be that multiple carriers are fed back in one PUCCH resource of the same carrier in the same subframe.

Taking the PUCCH format 2b as an example, it is assumed that the base station configures 21 LAA carrier aggregations for the UE, and at the same time, the uplink data is scheduled to be transmitted in the same subframe of each carrier. Then, the UE needs to perform CCA detection for 21 carriers and report the CCA detection result. At this time, the base station and the UE agree to use a certain PUCCH format to perform feedback of the CCA detection result, for example, format 2b. When the base station schedules the UE to send the uplink data in the subframe n, the base station needs to configure the corresponding resource in the subframe n of the primary carrier in the manner of allocating resources for the PUCCH format 2b in the current LTE system. The UE then performs CCA detection for 21 carriers, and the detection result of each LAA carrier ranks the corresponding CCA detection result according to an agreed order (for example, the serving cell index is small to large) (if 1 bit per carrier describes whether the CCA detection is successful) Forming a bit to be fed back. Then, according to the coding modulation, sequence selection, and resource calculation of the existing PUCCH format 2b, the corresponding feedback resources are acquired and transmitted. Note that the CCE index used at this time is the minimum CCE index of the PDCCH scheduled for this uplink.

The base station also calculates the resource used for reporting the current CCA detection result according to the CCE index, and then performs decoding and the like. At this time, the base station parses the bits of the format 2b according to the previously agreed CCA detection result.

For the case where multiple carriers feed back the CCA detection result in different resources of the same carrier in the same subframe, the foregoing modes 1, 2, and 3 can be used, and the ACK is fed back to different resources of the same carrier with the existing multiple carriers. The resource of /NACK is determined in the same way (Section 10.1.2.2 of 36.213vd00).

Example 7

The method of transmitting UCI by means of the existing PUSCH carries the CCA detection result. Specifically:

The base station and the UE stipulate that when the subframe nk sends the PDCCH scheduling UE to send the uplink data in the subframe n of the multiple unlicensed carriers, the UE needs to perform the CCA detection before the data is sent, and the result of the CCA detection needs to be reported to the base station. Preferably, it is reported in the authorized carrier subframe n.

The base station and the UE stipulate that the resource for reporting the CCA detection result of the subframe n is determined by the manner in which the UCI is transmitted by the existing PUSCH (that is, the resource allocation mode when the UCI is transmitted using the existing PUSCH (see section 5.2.4 of 36.212 vd00). , allocate resources for CCA test results feedback). The process of determining the resource at this time is determined using the CCE of the PDCCH in the subframe n-k (the selection and usage of the specific CCE is the same as the existing protocol). The base station receives the CCA detection result fed back by the UE on the resource according to the foregoing rules, and parses the bit according to the CCA detection result.

The present application mainly utilizes the existing PUCCH or PUSCH as the mechanism for UCI transmission, and redefines the meaning of the bits therein as the CCA detection result, thereby transmitting the CCA detection result information to the base station, and the remaining resources are allocated, encoded, and transmitted, and the existing mechanism is used. . In the foregoing multiple embodiments, when determining the resources that are fed back by the CCA detection result, the CCEs of the PDCCH of the uplink grant information of the uplink scheduling are combined with the parameters of the high-layer signaling notification, and the determining manner is the same as the existing protocol. .

Embodiments 1 to 7 can also be said to transmit a new information, that is, the CCA detection result of the UE, using the existing PUCCH format (or the PUSCH transmitting the UCI). The information may be mixed with the information in the existing PUCCH format (UCI in the PUSCH) (when the hybrid transmission is performed, those bits in the information to be transmitted in advance need to be the result of the CCA detection), or the independent PUCCH resources may be separately allocated for transmission. The latter is preferred.

Example 8

The problem to be solved by this embodiment is different from the first seven embodiments, but the principle is the same as the above embodiment. This embodiment provides feedback information about whether the UE sends data under semi-persistent scheduling.

The problem solved in the eighth embodiment: In the LTE system, there is currently a semi-persistent scheduling (SMS), for example, the base station sends an uplink grant. After the information, the uplink authorization information is valid for a long time (before the base station does not send the termination information), and the UE sends the uplink data in the corresponding subframe according to the uplink authorization information, but the UE sometimes arrives when the corresponding uplink subframe arrives. The UE happens to have no data to send. At this time, the LTE approach is that the UE sends some padded data (invalid data) to ensure the persistence of semi-persistent scheduling. If the UE does not send data, it may be terminated by semi-persistent scheduling. However, this method is not conducive to the power saving of the UE, and brings interference to the neighboring cell. If the transmission interval of the semi-persistent scheduling is further narrowed, the problem will be more serious. In addition, similar problems may exist for the enhanced dynamic scheduling. For example, in the case of dynamic scheduling, when the UE uses the resources to compete for resources to transmit uplink data, there are also cases where the UE competes for resources but no data is transmitted. Therefore, the solution of the present application can also solve the indication that there is no data transmission during dynamic scheduling.

In order to overcome the above problem, the present application provides a UE reporting information, which is used to describe that the UE does not need to send data at this time (subsequent still needs to continue to send). After receiving the information, the base station does not terminate the semi-persistent scheduling of the UE.

The specific embodiment of this embodiment is:

When the UE is in semi-persistent scheduling (the uplink grant information has been received before, and is valid for a long period of time), when the UE does not need to send uplink data in the corresponding transmission subframe (or timing), the UE gives feedback to the base station. Report information 1. The information 1 indicates that the UE does not have corresponding uplink data transmission at this time. If the UE has data transmission in the corresponding subframe, the UE may also send indication information that the UE sends the data (the principle is the same as the transmission information 1, and the information 1 is taken as an example below).

The base station and the UE stipulate that the corresponding subframe in the carrier corresponding to the semi-static data (or the primary carrier to which the base station and the UE agree to transmit the semi-static data) are scheduled to send the semi-static data. A resource that feeds back the above information 1 for a UE, including a time domain, a frequency domain, or a code resource. The difference between the information 1 and other information is distinguished by the above resources. For the specific resource configuration mode, the resource allocation mode of the PUCCH format of the UE in the existing LTE (including the PUSCH resource allocation mode for transmitting the UCI) may be adopted. Including the allocation of time domain, frequency domain or code sub-resources. The coding mode and the mapping mode (including the coding mode and the mapping mode of transmitting UCI through the PUSCH) are also adopted in the same manner as the PUCCH format of the UE in the existing LTE.

Preferably, the information 1 includes 1-bit information, and is preferably carried in a manner corresponding to the PUCCH format 1a, including allocating a time-frequency domain and a code-domain resource. At this time, the base station and the UE agree to allocate resources for transmitting the information 1, and then the information 1 The encoding is performed according to the encoding, mapping, and scrambling methods of the format 1a, and then transmitted on the resources allocated by the information 1 (so that the encoding, mapping, and scrambling methods of the information 1 need not be redesigned).

In this embodiment, it can also be said that a new information, that is, information 1, is transmitted using the existing PUCCH format (or PUSCH transmitting UCI). It can be mixed and transmitted with information in the existing PUCCH format (UCI in PUSCH) (when the hybrid transmission is used, those bits in the information to be transmitted are required to be agreed in advance as information 1), and independent PUCCH resources (PUSCH resources, including time) can also be allocated. Domains, frequency domains, and code sub-resources, one of which can be considered to be different from the existing ones for transmission. The latter is preferred.

Example 9

The resource for the uplink transmission data is preempted by the UE from the resource pool allocated by the base station in advance. The present application provides the following manner to reduce the blind detection on the base station side. For example, the resource pool includes n resource blocks, and the UE needs to compete for one or more of the n to send uplink data. At this time, the base station needs to perform blind detection to find that the UE uses the resource block to send uplink data, which is obviously complicated. .

The following manner is provided in this embodiment:

After the UE contends from the resource pool to the resource for uplink data transmission, the uplink data is sent, and the UE sends the used resource index to the base station. The resource index is sent to the base station in the PUCCH mode, or is sent to the base station in the manner of transmitting the UCI in the PUSCH. The specific transmission resource index is in the same manner as the foregoing information 1 or CCA detection result. It can also be transmitted in this carrier at this time.

Considering that the resource index can exceed 2 bits, the way of transmitting UCI in the PUSCH is prioritized.

That is, the base station allocates a resource (including the time domain, the frequency domain, and the code domain) for transmitting the resource index, and the allocation manner is the same as the method for transmitting the UCI. Only then, the base station and the UE agree that the resource is used to transmit the resource index. The UE then transmits using the same coding, modulation, scrambling, and mapping transmission as the existing UCI. That is, the resource index is transmitted by means of the transmission mode of the UCI. At this time, the base station and the UE agree that the information on the resource is a resource index.

Behavior of the base station: The base station receives the resource index information sent by the UE, and intercepts the data in the corresponding resource according to the resource index for decoding.

The UE sends uplink data in the preempted resources, and sends a resource index to the base station in the allocated resources.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

Embodiments of the present disclosure also provide a computer storage medium. In an embodiment of the present disclosure, the computer storage medium may be configured to store program code for performing the following steps:

S1, when the UE is scheduled to send uplink data in the nth subframe of the unlicensed carrier, perform CCA detection before sending the uplink data, where n is a natural number;

S2: The detection result of the CCA detection is fed back to the base station.

In an embodiment of the present disclosure, the computer storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic disk. Or a variety of media such as optical discs that can store program code.

In an embodiment of the present disclosure, the processor performs, according to the stored program code in the storage medium, when the UE is scheduled to send uplink data in the nth subframe of the unlicensed carrier, and sends the uplink number. According to previous tests, CCA is performed, where n is a natural number;

In an embodiment of the present disclosure, the processor performs feedback of the detection result of the CCA detection to the base station according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the disclosure, and various changes and modifications may be made to the present disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Industrial applicability

In the technical solution of the embodiment of the present disclosure, when the UE is scheduled to send the uplink data in the nth subframe, before the uplink data is sent, the CCA detection is performed, and the detection result of the CCA detection is fed back to the base station to solve the problem. The related art has a problem that the terminal retransmission performance is degraded due to the CCA failure in the LAA system, so that the base station can clearly know whether the scheduled UE transmits the corresponding uplink data in the corresponding subframe, so that the base station can clear the current reception. Whether the data is valid data, in order to facilitate the use of the received data by the base station, avoiding invalid data participating in HARQ merging during retransmission, and ensuring that the actual number of HARQ retransmissions is not detected by CCA. The effect of failure, in turn, achieves the effect of improving data transmission efficiency.

Claims

A feedback method for performing idle channel estimation, including:

When the user equipment is scheduled to transmit uplink data in the nth subframe of the unlicensed carrier, performing idle channel assessment detection before transmitting the uplink data, where the n is a natural number;

The detection result of the idle channel assessment detection is fed back to the base station.
The method according to claim 1, wherein the detection result comprises one of: success, failure, and feeding back the detection result of the idle channel evaluation detection to the base station, at least one of the following manners:

When the idle channel assessment detection fails, the detection result is sent to the base station through the physical uplink control channel, or the detection result is sent to the base station by using the resource that sends the uplink control information in the physical uplink shared channel;

When the idle channel assessment is successful, the detection result is sent to the base station through the physical uplink control channel, or the detection result is sent to the base station by using the physical uplink shared channel to send the uplink control information;

When the idle channel assessment is successful or fails, the detection result is sent to the base station through the physical uplink control channel, or the detection result is sent to the base station by using the physical uplink shared channel to send the uplink control information.
The method of claim 2, wherein

And transmitting, by the physical uplink control channel resource to the base station, the method, by using the physical uplink control channel physical uplink control channel format 1 to send the detection result to the base station; and/or

And sending, by the physical uplink control channel, the detection result to the base station, where the detection result is sent to the base station by using the physical uplink control channel format 1;

The physical uplink control channel format 1 includes at least one of the following: The control channel format 1 has the same coding mode, time domain resource allocation mode, frequency domain resource allocation mode, code domain resource allocation mode, and mapping transmission mode.
The method of claim 2, wherein

And sending, by the physical uplink control channel, the detection result to the base station, where the detection result is sent to the base station by using the physical uplink control channel format 1a;

The physical uplink control channel format 1a includes at least one of the following: an encoding mode, a time domain resource allocation mode, a frequency domain resource allocation mode, a code domain resource allocation mode, and a mapping sending mode, which are the same as the physical uplink control channel format 1a.
The method according to claim 3 or 4, wherein

Allocating different physical uplink control channel format 1 or resource index of physical uplink control channel format 1a to the detection result and the success confirmation/failure confirmation message or the scheduling request by means of a manner agreed by the base station and the user equipment; or

The n-th subframe is estimated by the physical downlink control channel of the uplink grant information carried in the nk subframe or the control channel element with the smallest index number among the control channel elements of the enhanced physical downlink control channel in a manner agreed by the base station and the user equipment. The user equipment feeds back a value of a resource index of the detection result;

The resource index of the physical uplink control channel format 1 or 1a, where k is the number of interval subframes of the uplink grant information transmission subframe and the corresponding uplink data transmission subframe.
The method according to claim 5, wherein the calculating, according to the protocol long-term evolution TS36.211vd00, the time domain, the frequency domain, and the code domain resource of the detection result by the user equipment.
The method according to claim 1, wherein the feeding back the detection result of the idle channel evaluation detection to the base station comprises: after the subframe corresponding to the nth subframe or the corresponding subframe in the authorized carrier The detection result of the idle channel evaluation detection is fed back to the base station in the first subframe.
The method according to claim 7, wherein, in the nth subframe, when the corresponding subframe in the authorized carrier is a downlink subframe, the authorized carrier is in the nth subframe by a manner agreed by the base station and the user equipment. The detection result of the idle channel evaluation detection is fed back to the base station in the first uplink subframe after the corresponding subframe, and/or after the subframe corresponding to the subframe in the nth subframe When one subframe is a downlink subframe, the first subframe is in the first uplink subframe after the first subframe after the subframe corresponding to the subframe corresponding to the subframe in the manner agreed by the base station and the user equipment. The detection result of the idle channel evaluation detection is fed back to the base station.
The method according to claim 8, wherein the base station and the user equipment agree on the first uplink subframe after the nth subframe, or the first subframe after the first subframe after the nth subframe When the uplink subframe feeds back the detection result of the idle channel assessment detection to the base station, the detection result further includes the number of failed channel assessment failures or successes accumulated by the user equipment.
The method according to claim 1, wherein when the base station transmits the physical downlink control channel or the enhanced PDCCH of the uplink grant information in the nkth subframe, the user equipment is in the primary carrier in a manner agreed by the base station and the user equipment. The detection result is fed back to the base station in the nth or n+1th subframe, where k is the number of interval subframes of the uplink grant information transmission subframe and the corresponding uplink data transmission subframe.
The method according to claim 1, wherein, when the detection result is a failure, the user equipment cannot send the nth subframe of the uplink data according to the uplink grant information, and the user equipment considers the retransmission to be invalid, and The number of times of retransmission is excluded from the actual retransmission count result.
The method according to claim 1, wherein when the base station receives the idle channel evaluation detection result corresponding to the nth subframe, and the failure is performed, the base station learns that the user equipment is due to the idle channel according to the idle channel evaluation detection result fed back by the user equipment. When the evaluation fails, the base station excludes the number of retransmissions from the actual retransmission count result.
The method according to claim 1, wherein when the base station receives the idle channel evaluation detection result corresponding to the nth subframe, and the failure is performed, or the base station returns the feedback according to the user equipment The idle channel evaluation detection result is that when the user equipment fails to detect the idle channel, the base station abandons the received signal and performs the hybrid automatic repeat request combining of the uplink data.
A feedback device that performs an idle channel assessment, comprising:

The detecting module is configured to: when the user equipment is scheduled to send the uplink data in the nth subframe of the unlicensed carrier, perform the idle channel assessment detection before sending the uplink data, where the n is a natural number;

The feedback module is configured to feed back the detection result of the idle channel assessment detection to the base station.
The apparatus according to claim 14, wherein the detection result comprises one of: success, failure, and the feedback module comprises:

The first feedback unit is configured to send the detection result to the base station through the physical uplink control channel when the idle channel assessment detection fails, or send the detection result to the resource that sends the uplink control information in the physical uplink shared channel. Sent to the base station;

The second feedback unit is configured to send the detection result to the base station through the physical uplink control channel when the idle channel assessment detection is successful, or send the detection result to the resource that sends the uplink control information in the physical uplink shared channel. Sent to the base station;

The third feedback unit is configured to send the detection result to the base station through the physical uplink control channel when the idle channel assessment detection succeeds or fails, or send the uplink control information by using the detection result through the physical uplink shared channel. The resources are sent to the base station.
A computer storage medium having stored therein computer executable instructions configured to perform a feedback method of performing a clear channel assessment as claimed in any of claims 1-13.