Communication method, device and system in unlicensed frequency band

Abstract

Embodiments of the present invention provide a communication method and device in an unlicensed frequency band, wherein the method includes: the base station sends request information to the small cell and the user equipment connected to the base station respectively, requesting the small cell and the user equipment to The user equipment measures the candidate channel on the unlicensed frequency band; the base station negotiates the working parameters of the small cell with the small cell according to the measurement results reported by the small cell and the user equipment; The working parameters of the small cell negotiated by the small cell are sent to the user equipment, so that the user equipment accesses the small cell and performs data transmission according to the working parameters of the small cell. Through the embodiment of the present invention, when the small cell transmits data on the unlicensed frequency band, the working channel with the least interference to other adjacent systems can be selected, and at the UE side, the working channel suffers the least interference from other adjacent systems.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to a communication method, device and system of an unlicensed frequency band. Background technique [0002] In recent years, wireless communication technology has developed rapidly. 3GPP (The 3rd Generation Partnership Project) standardization has been developed to Rel.12 (version 12). The key technology covers a wide range of small cell (Small Cell) configurations. , Carrier aggregation, 3D (3Dimensions, three-dimensional) multiple antenna technology (MIMO, Multiple-Input Multiple-Output, multiple-input multiple-output), etc. Even if breakthroughs have been made in many transmission technologies, considering the rapid development of current and future mobile services, as well as the diversification of terminal forms and the huge quantification of the number, the existing and foreseeable future, based on the licensed frequency band LTE (Long Term Evolution, long-term evolution) syst...

AI Technical Summary

Problems solved by technology

[0008] In order to illustrate the shortcomings of the common LBT mechanism used in the LTE network, the following two examples are used to illustrate, such as figure 1 As shown, the terminal UE is within the coverage of the WiFi AP, and is also within the coverage of the Small cell that intends to use the unlicensed frequency band, and the WiFi AP and the Small Cell are on both sides of the UE. Obviously, since the Small Cell is not in the WiFi If the LBT mechanism is used, it is very likely to choose the same channel as the WiFi AP, but because the UE is in the coverage of the WiFi AP, the UE cannot receive correctly because the WiFi AP and the Small Cell use the same channel to cause interference. Data from Small Cells

similar, such as figure 2 As shown, the Small Cell is between the UE and the WiFi AP. At this time, the UE is outside the coverage of the WiFi AP. If the LBT mechanism is used, the UE can use the same channel as the WiFi AP to send and receive data, but due to The Small Cell is very close to the WiFi AP, which makes it impossible to correctly receive data from the UE. At the same time, when sending data on this channel, it will also cause interference to the WiFi AP.

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