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Feedback method and device for performing clear channel assessment

A technology for free channel evaluation and data transmission, applied in the field of communication, can solve problems such as terminal retransmission performance degradation, and achieve the effect of improving data transmission efficiency

Active Publication Date: 2017-10-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention provides a feedback method and device for performing idle channel assessment, so as to at least solve the problem of terminal retransmission performance degradation caused by CCA failure in the related art in the LAA system

Method used

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  • Feedback method and device for performing clear channel assessment
  • Feedback method and device for performing clear channel assessment
  • Feedback method and device for performing clear channel assessment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Corresponding to mode 1, the method for feedbacking the CCA detection status of the UE and the base station is described. Figure 4 It is a schematic diagram of the detection result feedback according to Embodiment 1 of the present invention, such as Figure 4 As shown, the detection result is fed back in the nth uplink subframe.

[0071] When the base station and the UE agree to feed back the CCA detection situation, specifically, 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 sending a scheduling request (SR), and the base station only judges whether there is an SR request to send through energy detection.

[0072] If PUCCH format 1 is used to send CCA detection failure, it is agreed that when CCA detection fails, the UE sends the corresponding feedback signal, where the feedback signal is the same as the SR request, but the code resources to be sen...

Embodiment 2

[0080] Corresponding to mode 3, the method for feedbacking the CCA detection status of the UE and the base station is described.

[0081] 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 succeeds. The reverse is also possible. Wherein, 1 or 0 adopts the encoding and sending manner of PUCCH format 1a. This kind of feedback may correspond to the PUCCH format 1a in the existing LTE system. Currently, the format 1a is used to feed back whether the UE has correctly received downlink data.

[0082] The base station and the UE agree that the base station configures a feedback resource for feeding back CCA detection failure / success information in the subframe n of the licensed carrier corresponding to the corresponding uplink subframe n for the UE scheduled in the unlicensed carrier. When the UE performs CCA detection before sending data in t...

Embodiment 3

[0089] Based on embodiments 1 and 2, when the main carrier or licensed carrier is in TDD mode, Figure 5 It is a schematic diagram of the feedback of detection results based on TDD mode according to Embodiment 3 of the present invention, as shown in Figure 5 As shown in , the detection result is fed back in the n+1th uplink subframe. At this time, the subframe corresponding to subframe n in the main carrier (the subframe that sends uplink data and performs CCA before sending) in the main carrier may be downlink, and the UE cannot send the CCA detection result. At this time, it needs to be postponed in the main carrier until later The CCA detection result can only be sent in the first uplink subframe, which may cause a problem of missing a feedback opportunity.

[0090] If the delay occurs, the base station needs to reserve resources according to the method in subframe n in the first uplink subframe after the above, and the resources reported by the UE according to the CCA de...

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Abstract

The invention provides a feedback method and a device for performing clear channel assessment. The invention includes the following steps: when user equipment UE is scheduled to send uplink data in an nth sub-frame of a non-authorized carrier, performing clear channel assessment CCA detection before the UE sends the uplink data, wherein n is a natural number; and feeding back the result of CCA detection to a base station. Through the method and the device of the invention, the problem in the related technology that the retransmission performance of a terminal is degraded due to CCA failure in an LAA (License Assisted Access) system is solved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a feedback method and device for performing idle channel assessment. Background technique [0002] In related technologies, long-term evolution technology (LTE) communication networks are deployed and operated in licensed carriers. With the development of LTE, some companies have proposed "suggesting research on the topic of LTE deployment in unlicensed carriers", such as the United States Qualcomm believes that: With the rapid growth of data services, authorized carriers will not be able to withstand the huge amount of data brought about by rapid service growth in the near future. Consider deploying LTE in unlicensed carriers to share the data traffic in licensed carriers, which can solve the pressure on data volume brought about by business growth. At the same time, unlicensed carriers have the following characteristics: on the one hand, because unlicensed carriers do not nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04W74/08
CPCH04W74/0816H04W72/542H04W72/21H04W72/12
Inventor 苟伟赵亚军彭佛才李新彩
Owner ZTE CORP
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