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Method for implementing synchronous HARQ in TDD system and data transmission

A technology of data transmission method and implementation method, which is applied in the field of realization of synchronous hybrid automatic retransmission request in time division duplex system, can solve the problems of delayed retransmission and different time slots, achieve improved transmission efficiency, simple implementation, and market prospect broad effect

Active Publication Date: 2008-02-27
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for realizing synchronous HARQ of a TDD system and data transmission, so as to solve the problem of delayed retransmission caused by inconsistent time slots in TDD synchronous HARQ

Method used

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  • Method for implementing synchronous HARQ in TDD system and data transmission
  • Method for implementing synchronous HARQ in TDD system and data transmission
  • Method for implementing synchronous HARQ in TDD system and data transmission

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Embodiment 1

[0039] Embodiment 1, a method for implementing synchronous HARQ in a TDD system, as shown in FIG. 3 , in this embodiment, TTI is a time slot, and data decoding and feedback can be completed in one subframe, and each subframe includes 5 time slots, two uplinks and three downlinks, and five HARQ processes are set. In this embodiment, the HARQ process i d is the same as the numbering of the corresponding time slots in each subframe, so the numbering of the time slots in each subframe is 0 respectively , 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, the corresponding HARQ process id is 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4.

[0040] Correspondingly, as shown in Figure 4, the data transmission method of the TDD system synchronous HARQ includes the following steps:

[0041] 1. The data sender uses the time slot where the resource assigned by the scheduler is used to send the data block;

[0042] 2. The data receiver demodulates the received data and feeds back ACK / NACK informati...

Embodiment 2

[0047] Embodiment 2, a method for implementing synchronous HARQ in a TDD system. The difference from Embodiment 1 is that in this embodiment, TTI is two time slots; as shown in FIG. 5 , in this embodiment, TTI is Two time slots, data decoding and feedback can be completed in one subframe, each subframe includes 5 time slots, two uplink and three downlink, 2 HARQ processes are set, and the fifth time slot of each subframe hangs Since data is not transmitted, in this embodiment, HARQ process id=number / 2 of the first time slot of the corresponding multiple time slots in the subframe, then the time slot numbers in each subframe are 0, 1, 2, 3, 4, where the HARQ process id corresponding to time slots 0 and 1 of the first subframe is 0, the HARQ process id corresponding to time slots 2 and 3 of the first subframe is 1, and the time slot of the second subframe The HARQ process id corresponding to 0 and 1 is 0, the HARQ process id corresponding to the time slots 2 and 3 of the second ...

Embodiment 3

[0054] Embodiment 3, a method for implementing synchronous HARQ in a TDD system. The difference from Embodiment 1 is that in this embodiment, data decoding and feedback need to be completed within 2 subframes; as shown in FIG. 3 , in In this embodiment, TTI is one time slot, PD=2, that is, data decoding and feedback can be completed within 2 subframes, each subframe includes 5 time slots, two uplinks and three downlinks, and five HARQ processes are set , in this embodiment, the HARQ process id is the same as the number of the corresponding time slot in each subframe, then the time slot numbers in each subframe are 0, 1, 2, 3, 4 respectively, and the corresponding HARQ process id is 0, 1, 2, 3, 4.

[0055] Correspondingly, the TDD system synchronous HARQ data transmission method includes the following steps:

[0056] 1. The data sender uses the time slot where the resource assigned by the scheduler is used to send the data block;

[0057] 2. The data receiver demodulates the ...

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Abstract

This invention discloses a method for realizing synchronization of HARQ of the TDD system and a data transmission method to correspond the HARQ progress with the time slot number in a sub-frame to realize synchronizing HARQ, if re-transmission is needed, then transmission is done in the time slot of the same number of the succeeded sub-frames, and the re-transmitted time slot is the same with the last one in the direction of up and down lines, which avoids the delay of re-transmission caused by disagreed time slots and increses transmission efficiency of the TDD system.

Description

technical field [0001] The present invention relates to the technical field of data transmission of a communication system, in particular to a method for realizing a synchronous Hybrid Automatic Repeat Request (HARQ, Hybrid Automatic Repeat Request) in a Time Division Duplex (TDD, Time Division Dual) system and a data transmission method. Background technique [0002] In order to quickly feedback and retransmit the wrongly transmitted data blocks, and make full use of the information carried by the wrong data through data block merging, many systems use the HARQ technology of multi-channel parallel stop and wait. [0003] Stopping and waiting means that after using a HARQ process to transmit data packets, the process cannot continue to transmit any other data before receiving feedback information. The advantage of the stop-and-wait protocol is that it is relatively simple, but the transmission efficiency is relatively low. However, the multi-channel parallel stop-and-wait pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L12/56H04J3/06H04L1/16
Inventor 高卓李国庆毕海洲
Owner DATANG MOBILE COMM EQUIP CO LTD
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