HARQ-ACK information feedback method and device

A technology of feedback bits and feedback units, applied in the field of feedback of HARQ-ACK information, can solve the problems of no solution, increasing the upper limit of the number of carriers, and low feedback efficiency.

Active Publication Date: 2016-11-23
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the number of downlink carriers supported by UE increases, the absolute number of unscheduled downlink subframes will also increase accordingly, so the negative impact of invalid HARQ-ACK bits will undoubtedly be magnified accordingly
In this case, if the currently defined HARQ-ACK feedback mechanism is still used, the efficiency of the feedback information will be significantly reduced, which will eventually affect the peak downlink rate of the UE, which violates the original intention of increasing the upper limit of the number of carriers
[0016] From the above analysis, we can see that in order to effectively support the downlink CA with an upper limit of 32 carriers, the existing HARQ-ACK feedback mechanism will affect the peak downlink rate that the UE can achieve because of its low feedback efficiency.
However, there is still no ideal solution for this problem

Method used

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  • HARQ-ACK information feedback method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] In this embodiment, all downlink CCs of the UE are FDD downlink carriers, that is, the UE feeds back the HARQ-ACK of the downlink CC according to the FDD downlink HARQ timing relationship, and according to the eNB signaling instruction, the UE reports the feedback unit in the HARQ-ACK process In addition, the number of bits in the DL DAI field is 3, and the UE determines the total number of feedback units by receiving eNB physical layer signaling before determining the feedback bit sequence. There is no SPS scheduling within the time-frequency binding window. The specific implementation steps are as follows:

[0095] Step 1: The UE determines the time-frequency binding window corresponding to the uplink subframe n.

[0096] In this embodiment, K={4}, the time-frequency binding window is a set of downlink subframes with subframe numbers n-4 on all downlink CCs for which the UE feeds back HARQ-ACK in uplink subframe n, and the time-frequency binding window The index value...

Embodiment 2

[0107] In this embodiment, all downlink CCs of the UE are TDD carriers, and the UE feeds back the HARQ-ACK of the downlink CCs according to the HARQ timing relationship of TDD uplink and downlink configuration 2, and according to the eNB signaling instruction, the UE reports the HARQ-ACK in the HARQ-ACK process The feedback unit is TB. In addition, the number of bits in the DL DAI field is 3. The UE determines the total number of feedback units by receiving eNB physical layer signaling before determining the feedback bit sequence. There is no SPS scheduling within the time-frequency binding window. The specific implementation steps are as follows:

[0108] Step 1: The UE determines the time-frequency binding window corresponding to the uplink subframe n.

[0109] In this embodiment, K={8,7,6,4}, the time-frequency binding window is a set of downlink subframes with subframe numbers n-k on all downlink CCs where the UE feeds back HARQ-ACK in uplink subframe n , where k∈K, the ...

Embodiment 3

[0118] In this embodiment, there are both FDD downlink carriers and TDD carriers in the downlink CC of the UE, and the carrier where the uplink subframe that feeds back the HARQ-ACK is located is the FDD carrier. The UE feeds back the HARQ-ACK of the downlink CC according to the FDD timing relationship, and according to the eNB signaling instruction, the feedback unit in the process of the UE reporting the HARQ-ACK is the downlink subframe. In addition, the number of bits in the DL DAI field is 3, and the UE according to the eNB's RRC layer signaling determines the total number of feedback units O ACK , namely O ACK is a semi-statically configured value, and O ACK Not greater than the number of downlink subframes in the time-frequency binding window. There is no SPS scheduling within the time-frequency binding window. The specific implementation steps are as follows:

[0119] Step 1: The UE determines the time-frequency binding window corresponding to the uplink subframe n...

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Abstract

The invention discloses an HARQ-ACK information feedback method. According to the invention, a UE receives DL-GRANT scheduling downlink HARQ transmission, obtains DL DAI in the DL-GRANT and determines the mapping value of each DL DAI in a time frequency binding window corresponding to an uplink sub frame feeding back HARQ-ACK; performing bit mapping of the HARQ-ACK of each HARQ feedback unit onto corresponding bit of the feedback bit sequence. The invention also discloses an HARQ-ACK information feedback device. By adopting the method and device provided by the invention, invalid HARQ-ACK bits can be removed effectively, HARQ-ACK feedback efficiency can be improved, so that UE downlink peak value rate can be ensured.

Description

technical field [0001] The invention relates to wireless communication system technology, in particular to a feedback method and equipment for HARQ-ACK information. Background technique [0002] The Long Term Evolution (LTE) system supports two duplex modes of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). figure 1 It is the frame structure of the TDD system. The length of each radio frame is 10ms, which is equally divided into two half-frames with a length of 5ms. Each half-frame contains 8 time slots with a length of 0.5ms and 3 special domains, namely downlink pilot time slot (DwPTS), guard interval (GP) and uplink pilot time slot (UpPTS), these 3 special domains The sum of the lengths is 1ms. The TDD system supports seven different TDD uplink and downlink configurations, as shown in Table 1. In Table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents the above-mentioned special subframe including three special fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04L1/1861H04L1/1864H04L1/1893H04L1/1896
Inventor 张世昌李迎阳付景兴王轶孙程君许丽香
Owner BEIJING SAMSUNG TELECOM R&D CENT
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