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Data transmission method and device

一种传输数据、设备的技术，应用在无线通信系统领域，能够解决干扰接收操作、不能同时执行接收和发送等问题，达到提高灵活性、保证友好共存、避免浪费的效果

Active Publication Date: 2017-11-21
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, for the third frame structure, when the base station works on multiple carriers, and the frequencies of these carriers are adjacent or the intervals are relatively close, the receiving and sending operations cannot be performed on these carriers at the same time
This is due to the imperfection of the filter, the signal transmitted by the base station on one carrier will leak to another carrier, thereby interfering with the receiving operation on this carrier

Method used

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  • Data transmission method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] On a carrier in the unlicensed frequency band, the device seizes the channel based on the LBT mechanism, and the time it occupies the channel cannot exceed the maximum channel occupation time (MCOT), thus giving other devices the opportunity to compete for the channel. After the first device preempts the channel through its LBT operation, if its actual data transmission time is less than MCOT, then, when the data transmission of the first device is scheduled after the data transmission of the second device, the first device within a subframe For data transmission between two devices, as long as the current subframe is within the MCOT of the channel occupied by the first device, the second device can perform the first LBT to determine whether data transmission can be performed in this subframe; otherwise, the second device needs to execute The second LBT is used to determine whether data transmission can be performed in this subframe. Here, the first LBT is more aggressi...

Embodiment 2

[0107] In the unlicensed frequency band, when a device works on two or more adjacent carriers, because the frequency interval between these carriers is relatively close, the transmission operation on one carrier will affect the transmission of the same device on adjacent carriers. Receive operation. In particular, the transmit operation on a carrier, its power leaked to the adjacent carrier will affect the CCA operation on this adjacent carrier, that is, even if this adjacent carrier is currently idle, but because of the leaked power, this The device will mistakenly think that the adjacent carrier is busy, so it cannot occupy this carrier. In the existing LAA downlink operation, the processing for this situation is to start transmission operations on these adjacent carriers at the same time as much as possible. For example, CAT4 LBT may be performed on each carrier separately, but after the base station successfully completes LBT of one carrier, it may perform a self-delay pr...

Embodiment 3

[0139] On a carrier in the unlicensed frequency band, depending on the scheduling of the base station, the UE can perform CAT2 or CAT4 LBT to compete for the channel, and start uplink transmission after successfully completing the LBT. For CAT2, the UE only needs to detect the idleness of T1us before the start timing of the uplink transmission, for example, if T1 is equal to 25us, then the UE can occupy the channel. For CAT4, it is necessary to generate a random number N according to the size of the current CW. After the UE detects that the channel of T2us is idle, for example, T2 is equal to 25us, it continues to detect the channel. When the number of currently idle CCA time slots reaches N, it can occupy it. channel. After the UE successfully completes CAT4, there are two processing methods. The first processing method is to immediately send a filling signal occupying the channel until the start timing of the scheduled uplink transmission, and then start to transmit the sch...

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PUM

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Abstract

The application puts forward a data transmission method comprising the following steps: scheduling signaling transmitted via a first device is detected via second devices, and an LTB mechanism and corresponding parameters of a contention channel configured for the first device are determined; LBT is performed via the second devices, and uplink data is transmitted after the LBT is successfully conducted. Data transmission LBT mechanisms for the second devices are can be set for a group or all of the second devices via common control signaling, and LBT mechanisms adopted for the second devices can be correspondingly determined by the second devices according to whether the common control signaling is received. The second devices need to report capability of the second devices to simultaneously receive and transmit on neighboring carrier waves to the first device, and uplink and downlink transmission of the second devices can be reasonably scheduled via the first device according to the capability. Via adoption of the method disclosed in the invention, flexibility of control over the LBT mechanisms of UE uplink transmission by a base station can be improved, waste of downlink resources can be prevented, and friendly coexistence with other devices can be ensured.

Description

technical field [0001] The invention relates to wireless communication system technology, in particular to a method and equipment for transmitting data on an unlicensed frequency band. Background technique [0002] The Long Term Evolution (LTE) system of the 3rd Generation Partnership Project (3GPP) standardization organization supports three frame structure types. Including Frequency Division Duplex (FDD) and Time Division Duplex (TDD), which are generally deployed on licensed frequency bands; the third frame structure is used in unlicensed frequency bands, based on first detect before transmission (LBT) and other wireless access Technology coexists. The above three frame structures all configure a wireless frame with a length of 10 ms and equally divide it into 10 subframes with a length of 1 ms. Wherein, a subframe is composed of two consecutive time slots with a length of 0.5 ms, that is, the kth subframe includes time slot 2k and time slot 2k+1, where k=0, 1, . . . 9 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0808H04W74/0833H04W16/14H04W74/002H04L1/1825H04W72/1263H04W72/20H04B7/0413H04L1/1812H04L5/0007H04W72/569
Inventor 李迎阳王轶张世昌
Owner BEIJING SAMSUNG TELECOM R&D CENT
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