Channel detection method, channel detection system, base station and terminal

Abstract

The invention discloses a channel detection method, a channel detection system, a base station and a terminal. The method includes: determining the channel occupancy parameter of data; if the channel occupancy parameter is less than or equal to a first preset parameter, the channel detection Send the data under the condition; if the channel occupancy parameter is greater than the first preset parameter and less than or equal to the second preset parameter, then perform channel detection with the first preset granularity and / or the first preset contention window , and when the detection result satisfies the channel occupancy condition, send the data; if the channel occupancy parameter is greater than the second preset parameter, perform channel detection with the second preset granularity and / or the second preset contention window , and when the detection result satisfies the channel occupation condition, sending the data, the first preset granularity is smaller than the second preset granularity, and the first preset contention window is smaller than the second preset contention window. Through the present invention, data time delay can be reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel detection method, a channel detection system, a base station and a terminal. Background technique [0002] In traditional LTE Assisted Access (LAA), the unlicensed spectrum is accessed based on the LTE structure, and its subcarrier spacing (subcarrier spacing) is 15KHZ, and each subframe is 1ms, divided into 14 symbols. Under such a structure, for the channel detection mechanism of one shot, that is, for the downlink, the channel detection mechanism that only includes the Discovery Reference Signal (Discovery Reference Signal, DRS) and does not include the Physical Downlink Shared Channel (PDSCH) or the uplink The type 2 mechanism is to detect that the channel is idle within 25us, which means the channel is idle and the channel can be occupied, of which 25us is divided into 16us+9us. Under this mechanism, the channel occupation time cannot exceed 1ms. Under such a st...

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Problems solved by technology

Even if the subcarrier spacing is 15KHZ consistent with LTE, the occupation time of this channel is only 1 / 14ms, which is far shorter than the shortest maximum channel occupation time of 1ms, and the subcarrier spacing is 15 times (2 to the nth power) , the time length of a symbol is divided by 1 / 14 (2 to the nth power), in this case, the detection is still carried out according to the current shortest channel detection time of LTE, 25us, which will bring time delay

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