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Feedback method and device for downlink short tti downlink transmission

A technology of feedback device and transmission time interval, applied in transmission system, digital transmission system, multiple use of transmission path, etc., can solve problems such as feedback resource conflicts, and achieve the effect of avoiding resource location conflicts

Active Publication Date: 2020-04-28
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, after LTE introduces a shorter downlink transmission time interval sTTI, the scheduling mode with a TTI of 1 ms and the scheduling mode with a short transmission time interval sTTI exist in the cell at the same time. The existing technology can only be scheduled for UEs with a TTI of 1 ms; And UEs with a TTI of 1 ms will occupy part of the PUCCH resources when feeding back ACK or NACK. If some UEs are scheduled with a short transmission time interval sTTI at this time, the feedback resources between UEs scheduled with multiple TTIs will conflict. , the existing technology cannot solve this problem

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  • Feedback method and device for downlink short tti downlink transmission
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  • Feedback method and device for downlink short tti downlink transmission

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Embodiment Construction

[0031] As described in the background art, after LTE introduces a shorter transmission time interval sTTI, there are both a scheduling method with a TTI of 1 ms and a scheduling method with a short transmission time interval of sTTI in the cell. The UE is scheduled; and the UE with a TTI of 1ms will occupy part of the PUCCH resources when feeding back ACK or NACK. If some UEs are scheduled with a short transmission time interval sTTI at this time, the feedback between UEs scheduled with multiple TTIs Resources will conflict, and the existing technology cannot solve this problem.

[0032] The downlink short TTI referred to in the embodiment of the present invention may be a short transmission time interval sTTI with a time length of less than 1 ms (in order to distinguish it from a conventional TTI, the sTTI is used for marking).

[0033] The feedback method and device for downlink transmission of the downlink short TTI in the embodiment of the present invention can be used in a bas...

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Abstract

A downlink transmission feedback method of a downlink short TTI and a device thereof are disclosed. The downlink transmission feedback method of the downlink short TTI comprises the following steps of determining multiple different reference values for user equipment using the downlink short TTI according to different scheduling starting positions of the user equipment in the same subframe; and sending at least a part of the multiple reference values to the user equipment so that the user equipment determines a resource position for sending HARQ feedback according to the reference values. In the technical scheme of the invention, determination of the resource position of the HARQ feedback when there is the downlink short TTI is realized and a resource conflict when the HARQ feedback is sent is avoided.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a feedback method and device for downlink transmission of a downlink short TTI. Background technique [0002] In the existing Long Term Evolution (LTE), a base station (eNB) schedules downlink data transmission and uplink data transmission through Downlink Control Information (DCI) in a subframe. [0003] In the prior art, when the base station transmits downlink data, the UE determines the position of the feedback resource according to the minimum control channel element (control channel element, CCE) index constituting the DCI and a fixed reference value. For downlink data transmission, the base station indicates the resource configuration of downlink data transmission to User Equipment (UE) in subframe n through DCI, for example, modulation and coding format, location information of allocated physical resource blocks, etc. The base station does user sched...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
CPCH04L5/0055
Inventor 邓云
Owner SPREADTRUM COMM (SHANGHAI) CO LTD