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Method and device for determining feedback time sequence of hybrid automatic repeat request

A technology of hybrid automatic retransmission and feedback timing, which is applied in transmission systems, digital transmission systems, and multiple uses of transmission paths. too much effect

Active Publication Date: 2017-11-21
CHINA MOBILE COMM LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the TDD frame structure, since the uplink and downlink transmissions are time-division multiplexed, it is impossible to find a fixed and identical feedback time interval for each subframe

Method used

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  • Method and device for determining feedback time sequence of hybrid automatic repeat request
  • Method and device for determining feedback time sequence of hybrid automatic repeat request
  • Method and device for determining feedback time sequence of hybrid automatic repeat request

Examples

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example 1

[0186] Example 1: TDD uplink and downlink configuration mode 0

[0187] The following describes the feedback timing determined according to the method described in the embodiment of the present invention under different TTI lengths in the TDD uplink and downlink configuration mode 0 (which corresponds to the TDD configuration DSUUUDSUUU).

[0188] A) 0.5ms TTI

[0189] Considering a TTI of 0.5ms, that is, the number of (SC-)OFDM symbols contained in one TTI is the same as that of an existing slot (slot), 7 in the case of normal CP (6 in the case of extended CP) ); Considering being compatible with the existing LTE system, the TTI situation in a radio frame (frame) is as follows Figure 4 shown. Figure 4 What is given is the case of normal CP, and TTIs are sequentially numbered from 0 to 19 in the radio frame. For the case where the subframe number remains unchanged and the TTIs are only numbered within the subframe, the TTI numbers within each subframe are 0-1. Figure 4 Th...

example 2

[0246] Example 2: TDD uplink and downlink configuration mode 1

[0247] TDD uplink and downlink configuration mode 1, corresponding to TDD ratio DSUUDDSUUD, introduces that under the TTI length of 0.5ms and 4 / 3OFDM symbols, the feedback timing is determined according to the method described in the embodiment of the present invention.

[0248] A) 0.5ms TTI

[0249] Considering a TTI of 0.5ms, that is, the number of (SC-)OFDM symbols contained in one TTI is the same as that of an existing slot, which is 7 (extended CP is 6);

[0250] Two cases are considered. In case 1, it is set that the UpPTS in the special subframe cannot transmit the HARQ feedback information of the PDSCH. In case 2, it is set that the UpPTS in the special subframe can transmit the HARQ feedback information of the PDSCH.

[0251] According to the special subframe configuration mode, it can be divided into two types, one is the special subframe configuration mode 0, 5, 9 and 10, which will not have downlink ...

example 3

[0293] Example 3 Uplink and downlink configuration mode 2

[0294] A) 0.5ms TTI

[0295] Considering a TTI of 0.5 ms, that is, the number of (SC-)OFDM symbols contained in one TTI is the same as that of an existing slot, which is 7 (6 in the extended CP). Here is the case of normal CP. For the case where the subframe number remains unchanged and the TTIs are only numbered within the subframe, the TTI numbers within each subframe are 0-1.

[0296] Two cases are considered, case 1: the UpPTS in the special subframe cannot transmit the HARQ feedback information of the PDSCH, and case 2: the UpPTS in the special subframe can transmit the HARQ feedback information of the PDSCH.

[0297] According to the special subframe configuration mode, it can be divided into two types, one is the special subframe configuration mode 0, 5, 9 and 10, which will not have downlink transmission in the second TTI of the special subframe, The other type is the special subframe configuration mode 1, ...

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Abstract

The invention provides a method and device for determining a feedback time sequence of a hybrid automatic repeat request. The method comprises the steps of determining configuration of a currently adopted TDD frame structure, wherein the configuration of the TDD frame structure comprises uplink and downlink configuration and a special sub-frame ratio; determining the size of a currently adopted transmission time interval (TTI); and determining a relative position relationship between a data transmission TTI and a feedback TTI thereof in an HARQ (Hybrid Automatic Repeat Request) process according to the configuration of the TDD frame structure and the size of the TTI, or a relative position relationship among an initial transmission TTI, a feedback TTI and a retransmission TTI. The invention can provide support for low-delay transmission. Furthermore, the embodiment of the invention can provide an HARQ feedback time sequence in allusion to a short threshold value, and thus faster low-delay transmission can be realized. In addition, the embodiment of the invention further can enable the HARQ feedback to be averagely borne on each feedback TTI as far as possible, thereby avoiding a certain / some feedback TTIs from bearing too much information.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and a device for determining a hybrid automatic repeat request (HARQ, hybrid Automatic Repeat reQuest) feedback sequence. Background technique [0002] Hybrid Automatic Repeat reQuest (HARQ, hybrid Automatic Repeat reQuest) is a combination of automatic repeat request ARQ and forward error correction code (FEC, Forward Error Correction), and is a means of link adaptation in the LTE system. [0003] The LTE system adopts the N-channel stop-and-equal HARQ protocol, that is, N processes exist at the same time, and each process uses the stop-and-equal ARQ protocol for transmission. After sending a data packet, the sender stops temporarily and waits for the confirmation message from the receiver, etc. When the data arrives at the receiving end, it is checked for errors. If the reception is correct, an ACK message will be fed back to the sending end. Oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L5/00
CPCH04L1/1806H04L1/1812H04L5/0055H04W28/04H04L1/1854H04L5/14H04W72/0446H04W72/23
Inventor 胡丽洁侯雪颖沈晓冬董静
Owner CHINA MOBILE COMM LTD RES INST
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