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Data transmitting method and apparatus

A technology of data transmission method and transmission direction, which is applied in the field of data transmission method and equipment, can solve problems such as ACK/NACK feedback conflicts, and achieve the effect of avoiding ACK/NACK feedback conflicts

Active Publication Date: 2015-05-06
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a data transmission method and equipment to solve the problem of ACK / NACK feedback conflict between D2D link and PDSCH of cellular link

Method used

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  • Data transmitting method and apparatus

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Embodiment Construction

[0068] How to solve the problem of ACK / NACK feedback conflict between the D2D link and the cellular link PDSCH has no relevant consideration in the existing mechanism. Intuitively, there are several ways to avoid conflicts:

[0069] Manner 1: Avoidance through scheduling, for example, not scheduling the physical downlink shared channel (PDSCH) transmission of the D2D UE in subframes n-k. The problem caused by this is that cellular transmission will be limited, especially in TDD systems, because uplink and downlink subframes share a radio frame, and one uplink subframe needs to carry multiple downlink subframes in some TDD uplink and downlink configurations. ACK / NACK feedback of the PDSCH, by avoiding scheduling the PDSCH transmission of the downlink subframe corresponding to the uplink subframe, it will greatly affect the cellular PDSCH transmission of the D2D UE in the TDD system.

[0070] Mode 2: If a conflict occurs, the PUCCH feedback of the cellular link is discarded, wh...

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Abstract

A method and a device for data transmission, the method comprising: transmitting cellular downlink data in a downlink subframe indicated by a time division duplexing (TDD) uplink / downlink reference configuration, said TDD uplink / downlink reference configuration being determined on the basis of the TDD uplink / downlink reference configuration of the cell and a D2D subframe configuration; on the basis of the HARQ feedback sequence of the cellular downlink data as based on the TDD uplink / downlink reference configuration, carrying out ACK / NACK feedback for the cellular downlink data using an uplink subframe indicated by said TDD uplink / downlink reference configuration. In the TDD uplink / downlink reference configuration, any subframe having the same serial number as a D2D subframe is not used for cellular downlink data ACK / NACK feedback. Through embodiments of the present invention, conflicts between D2D links and PDSCH ACK / NACK feedback of cellular links are avoided.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and equipment. Background technique [0002] Device-to-Device (D2D), that is, terminal direct technology, refers to the way that adjacent terminals can transmit data through direct links within a short distance without going through a central node (that is, a base station). Forward. [0003] In D2D research, there are four main scenarios to be considered, and each scenario can appear in combination, such as Figures 1a to 1d shown. [0004] in, Figure 1a In the scenario, user equipment 1 (UE1) and user equipment 2 (UE2) are both out of network coverage (Out of Coverage); Figure 1b In the scenario, UE1 is within the network coverage (In Coverage), and UE2 is outside the network coverage; Figure 1c In the scenario, UE1 and UE2 are within the network coverage of the same cell; Figure 1d In a scenario, UE1 and UE2 are within network ...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/18
CPCH04L1/1861
Inventor 赵锐高秋彬陈文洪彭莹
Owner DATANG MOBILE COMM EQUIP CO LTD
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