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Data transmission method and device

A transmission method and data transmission technology, applied in the field of communication, to achieve the effect of improving spectrum efficiency

Active Publication Date: 2017-01-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a data transmission method and device to at least solve the problem of how the uplink UE performs LBT and realizes multi-user frequency reuse when the LTE system operates in the unlicensed carrier frequency band in the related art

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] In this embodiment, the method of LBT of frame-based equipment (referred to as FBE) and load-based equipment (Load-based Equipment, referred to as LBE) of a station (base station, user equipment UE, home base station, and relay station) A brief introduction to the way of LBT.

[0145] Figure 5 is a schematic diagram of the LBT mechanism of the frame-based device FBE according to an optional embodiment of the present invention, such as Figure 5 As shown, for FBE, it has a fixed transmission frame structure. The channel occupation time and idle period constitute a fixed frame period. The device performs CCA detection during the idle period. When the channel is detected to be idle, data transmission can be performed immediately. Otherwise, CCA detection is performed again in the idle period of the next fixed frame period. For FBE in Europe, the channel occupancy time is 1 ms to 10 ms, and the idle period is at least 5% of the channel occupancy time. The duration of th...

Embodiment 2

[0148] This optional embodiment describes the process of the UE performing LBT according to the configuration information.

[0149] When the uplink behavior is based on FBE LBT, assuming that the time when the base station sends the UL grant is n, the UE should perform uplink data transmission at time n+k according to the timing relationship, where k is a predefined value, for example, for FDD, k is less than or equal to 4, For TDD bigger. Then the UE will perform the CCA at the time t_cca before the distance n+k, where t_cca is the duration of the predefined CCA or the initial CCA, and the value is, for example, 34 microseconds or 20 microseconds. If the UE executes the CCA successfully, the UE performs data transmission at time n+k, and if it fails, it cannot perform data transmission.

[0150] When the uplink is configured as LBE-based LBT, assuming that the UE should perform uplink data transmission at time n+k according to the timing, the base station can configure the s...

Embodiment 3

[0166] This optional embodiment specifically describes a method for realizing synchronous data transmission under LBE and multi-user CCA.

[0167] In order to realize that multiple UEs scheduled for uplink in the same subframe can perform data transmission at the same time after completing the CCA, a common waiting time can be defined. This time is the time of n eCCAs from the moment of data transmission, for example, the value of n is 1 or 2. This time is used for UEs that successfully execute LBE competition in advance to wait for UEs that do not succeed in competition to complete LBT within this time, and then the multiple UEs perform uplink data transmission together, thereby realizing FDM.

[0168] Figure 8 It is a schematic diagram of resource competition and data transmission according to the third optional embodiment of the present invention; Figure 8 As shown, assume that the base station configures three UEs to perform CCA at the same time at the same time, and the...

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Abstract

The invention provides a data transmission method and device. The method comprises that a base station sends a configuration signaling to user equipment UE, and the configuration signaling carries a clear channel assessment (CCA) parameter of the UE as well as an uplink transmission parameter of the UE; and the base station receives uplink data which is sent by the UE according to the configuration signaling. According to the invention, the problems in carrying out LBT and realizing multiplication of multiple user frequencies when an LTE system carries out operation in a non-authorized carrier frequency range in the related art are solved, and the efficiency of frequency spectrum is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a data transmission method and device. Background technique [0002] In the evolution process of Long Term Evolution (referred to as LTE), the LTE Rel-13 version was launched in September 2014, and one of the important contents is that the LTE system uses unlicensed carriers to work. This technology will enable the LTE system to use existing unlicensed carriers, greatly enhance the potential spectrum resources of the LTE system, and enable the LTE system to obtain lower spectrum costs. [0003] However, LTE will face many problems when using unlicensed carriers. First, in some countries and regions, there are corresponding control policies for the use of unlicensed spectrum. For example, for Listen Before Talk (LBT for short), also known as Clear Channel Assessment (CCA for short), two types are defined, one is frame-based FB), and the other is based on Loaded LBE. For the F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L25/02
CPCH04L5/003H04L5/0053H04L25/0224H04W74/0808H04W74/0816H04W16/14H04W72/23H04L1/1812H04L5/0048H04W74/0825
Inventor 李新彩苟伟赵亚军
Owner ZTE CORP
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