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Data transmission method and equipment on unauthorized frequency spectrum

A technology of unlicensed spectrum and licensed spectrum, applied in the field of data transmission method and equipment on unlicensed spectrum, can solve the problems such as the inability to use the LTE/LTE-A system solution and the complex frame structure definition, so as to shorten the waiting time and improve the The effect of channel utilization

Active Publication Date: 2018-03-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the frame structure definition in the 5G NR standard may be more complicated, a variable-length subframe structure may be defined (based on the subcarrier spacing or the number of OFDM symbols contained), and the coexistence between subframes of different lengths is allowed ( on different frequency bands in the same time period, or on the same frequency band in different time periods)
Therefore, in the 5G NR system, the initial moment after LBT cannot follow the scheme of the LTE / LTE-A system
In the 5G NR system, how to transmit data on the unlicensed spectrum, there is no solution yet

Method used

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  • Data transmission method and equipment on unauthorized frequency spectrum
  • Data transmission method and equipment on unauthorized frequency spectrum
  • Data transmission method and equipment on unauthorized frequency spectrum

Examples

Experimental program
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Effect test

Embodiment 1

[0114] Embodiment 1. In this embodiment, data transmission at the sending end needs to be aligned with reference subframe boundaries. The sending end and the receiving end need to clarify with each other the possible data sending and data receiving start times after LBT, so as to ensure that the channels of the sending and receiving parties are synchronized, so as to complete the communication interaction. When at least two subframes are configured, that is, there are multiple possible configurations of subframes (such as time length), for the sender, after determining that the unlicensed spectrum is free and available, it can select the one used for this transmission according to its own scheduling. Subframe configuration: For the receiving end, at each possible transmission start moment on the unlicensed frequency spectrum, detection is performed according to each subframe configuration in the at least two subframes.

[0115] like Figure 7 As shown, it is assumed that the ...

Embodiment 2

[0129] Embodiment 2. The difference between this embodiment and Embodiment 1 is that in this embodiment, data transmission at the sending end is not required to be aligned with reference subframe boundaries.

[0130] In this embodiment, the transmission start time may be: the time at which the start time of the reference subframe where T0 is located is separated by at least one first time length, and the first time length is the shortest time among the at least two subframes The length of the subframe.

[0131] Figure 9 In the shown embodiment, the possible transmission start time of the eNB is T1, and within each interval equal to the reference subframe after the transmission starts, there are 6 combinations of subframes used for transmission, such as Figure 9 As shown, the eNB has three possible subframe configurations for transmission at the start of transmission, and the eNB can select the used subframe configuration according to its own scheduling.

Embodiment 3

[0132] Embodiment 3 In this embodiment, it is required that the data transmission at the sending end is aligned with the Orthogonal Frequency Division Multiplex (OFDM for short) symbol boundary.

[0133] Correspondingly, the second moment is the start moment of any OFDM symbol in the OFDM symbols included between the first moment and the third moment.

[0134] In order to reduce the complexity of data detection at the receiving end and reduce the number of reception attempts at the receiving end, the second moment is one OFDM symbol in at least one OFDM symbol set between the first moment and the third moment the starting moment of .

[0135] For example, if 5G NR is consistent with the LTE system, and also uses 15KHz subcarriers and maintains 14 symbols within 1ms (but it does not mean that the internal design of the subframe is completely the same), in order to coordinate the coexistence of LTE and 5G NR dual systems, it will be required The symbol boundary of 5G NR transmi...

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Abstract

The invention discloses a data transmission method and data transmission equipment on an unauthorized frequency spectrum. The method comprises the steps as follows: a sending end performs LBT operation on the unauthorized frequency spectrum; and if the condition that the unauthorized frequency spectrum is idle and can be used is determined at a first moment, data is sent to a receiving end via theunauthorized frequency spectrum at a second moment, wherein the second moment is more than or equal to the first moment and less than or equal to a third moment, the third moment is a start moment ofa reference sub-frame after the first moment, the length of the reference sub-frame is the same as that of one sub-frame of the preconfigured at least two sub-frames, and the adjacent reference sub-frames are continuous in time. Therefore, data sending and receiving on the unauthorized frequency spectrum are achieved under the condition that the plurality of sub-frames with different lengths areconfigured; the second moment is more than or equal to the first moment and less than or equal to the third moment, and the third moment is the start moment of the reference sub-frame after the firstmoment, the waiting time between the moment after LBT and the start moment of data transmission is shortened, and a channel utilization rate is improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a data transmission method and equipment on an unlicensed frequency spectrum. Background technique [0002] With the rapid increase of wireless data traffic, the licensed spectrum may not be able to meet the spectrum requirements required for communication. 3GPP introduced License Assisted Access (LAA for short) and enhanced LAA (eLAA for short) technologies in Release 13 (Release-13, R-13 for short) and R-14 respectively. , that is, the non-standalone LTE / LTE-A system is deployed on the unlicensed spectrum, and the unlicensed spectrum resources are utilized to the greatest possible extent through the assistance of the licensed spectrum. [0003] Communication systems deployed on unlicensed spectrum usually use / share wireless resources in a competitive manner. The same or similar principles are used between stations (such as stations under the framework of the Institute o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W72/12H04W74/08
CPCH04W72/0446H04W74/0808H04W72/53H04W72/542H04W72/20H04L5/0007H04L5/001H04L5/0082H04L5/0092H04L27/0006H04L27/26025H04L27/26H04L5/0048
Inventor 庞继勇张佳胤
Owner HUAWEI TECH CO LTD