Method and terminal for feeding back ACK/NACK (Acknowledgement/Non-acknowledgement) information with uplink sub-frame

A non-acknowledgment, subframe technology, applied in the LTE field, can solve the problem of wasting resources, and achieve the effect of saving physical resources

Active Publication Date: 2011-05-04
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Obviously, the above implementation method is a waste of resources

Method used

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  • Method and terminal for feeding back ACK/NACK (Acknowledgement/Non-acknowledgement) information with uplink sub-frame
  • Method and terminal for feeding back ACK/NACK (Acknowledgement/Non-acknowledgement) information with uplink sub-frame
  • Method and terminal for feeding back ACK/NACK (Acknowledgement/Non-acknowledgement) information with uplink sub-frame

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Embodiment Construction

[0051] The core of the present invention is that: the UE selects the downlink subframe with the smallest value of m and the smallest value of m to obtain a relatively small PUCCH logical resource index, thereby saving the physical resources used by PUCCH grid 1 / 1a / 1b; in addition, making full use of The resource transmission RI implicit in the PUCCH format 1 / 1a / 1b is eliminated, thereby saving the physical resources of the PUCCH format 2 / 2a / 2b.

[0052] Such as Figure 7 Shown, be method flowchart of the present invention:

[0053] Step 100, the UE obtains the set K{k of the current uplink subframe n according to the uplink and downlink ratio 1 , k 2 ...k m}, where m is the index of the set K, less than or equal to M-1; see Figure 6 , the relationship between the uplink and downlink ratio and the set K can be obtained, M is the number of elements in the set K, and the physical meaning is that the uplink subframe needs to feed back the maximum number of ACK / NACK informatio...

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Abstract

The invention discloses a method and terminal for feeding back ACK / NACK (Acknowledgement / Non-acknowledgement) information with an uplink sub-frame. The method comprises the following steps: UE (User Equipment) obtains a set K containing multiple k values according to the current uplink-downlink ratio, and detects whether a downlink sub-frame n-km occupies a PDCCH (Physical Downlink Control Channel), wherein m is an index of K; the UE selects the downlink sub-frame with the least m value from the detected downlink sub-frames occupying the PDCCH, and obtains a PUCCH (Physical Uplink Control Channel) logic resource index sending the ACK / NACK information according to the index value of the start CCE (Channel Control Element) of the downlink sub-frame with the least m value occupying the PDCCHand the least m value; and the UE selects the physical resources corresponding to the logic resource index and feeds the ACK / NACK information generated by the downlink sub-frame occupying the PDCCH back to a base station through PUCCH on an uplink sub-frame n. In the invention, a relatively small PUCCH logic resource index is obtained by selecting the downlink sub-frame with the least m value so as to save the physical resources.

Description

technical field [0001] The present invention relates to LTE (Long Term Evolution) technology, in particular to a method for feeding back acknowledgment / non-acknowledgment ACK / NACK information by using an uplink subframe, and a terminal for feeding back ACK / NACK information by using an uplink subframe. Background technique [0002] In the LTE system, the application of HARQ (hybrid automatic repeat quest) technology improves the reliability of communication. It decides whether to retransmit the old data through the feedback ACK / NACK (acknowledgment / non-acknowledgement) information. For downlink HARQ, ACK / NACK is fed back on the uplink PUSCH (Physical Uplink Shared Channel) or PUCCH (Physical Uplink Control Channel). [0003] For TDD (Time Division Duplexing) system, the system frame structure is as attached figure 1 As shown, the asymmetry of uplink and downlink subframes determines that one uplink subframe may need to feed back ACK / NACK of several downlink subframes. For s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/00H04W72/12
CPCH04L1/1861
Inventor 安豆娃
Owner SANECHIPS TECH CO LTD
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