A channel listening method and device applied to unlicensed frequency band
A technology of unlicensed frequency bands and channels, which is applied in the field of channel monitoring in unlicensed frequency bands, and can solve problems such as short transmission distances
Active Publication Date: 2021-06-15
HUAWEI TECH CO LTD
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Problems solved by technology
In a high-frequency (such as 60GHz) communication system, due to the rapid attenuation of the electromagnetic wave surface and the short transmission distance, in order to enhance the coverage and effectively suppress interference at the same time, the signal transmission adopts directional sending / receiving technology; in this directional transceiver system In , the beam is usually variable, however, there is currently no channel sensing scheme that supports variable beam
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[0065] The present application will be described in detail below in conjunction with the accompanying drawings.
[0066] The channel sensing method in this application is applicable to various system architectures. figure 1 It is a schematic diagram of a network architecture used in this application. Such as figure 1 As shown, the network architecture includes a network device 101, and at least one terminal connected to the network device 101, for example figure 1 Terminal 1021, terminal 1022, terminal 1023 shown in. The network device 101 may perform data transmission with any terminal in the terminal 1021 , the terminal 1022 , and the terminal 1023 .
[0067] In this application, the network device may be a base station device (base station, BS). A base station device may also be called a base station, and is a device deployed on a wireless access network to provide wireless communication functions. For example, devices providing base station functions in a 5G network i...
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The present application discloses a channel sensing method and device applied to unlicensed frequency bands. The method includes: the communication device performs idle channel assessment on the first beam, and during the idle channel assessment process, the communication equipment uses the first beam's The fallback control parameter performs fallback, the communication device has multiple optional beams, the first beam is one of the multiple optional beams, and the fallback control parameter is based on the fallback control parameter of at least one of the multiple optional beams. The historical value is set; after the fallback is successful, the communication device uses the first beam for transmission. In this application, the back-off control parameters of the first beam are obtained according to the historical information of the back-off control parameters of at least one of the multiple optional beams, so as to fully adapt to the network conditions and avoid using random control parameters when the network conditions are good. The selection of a large value in the method leads to the problem of low communication efficiency, and can effectively ensure the rationality of the back-off control parameters of the first beam.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel monitoring method and device applied to unlicensed frequency bands. Background technique [0002] The clear channel assessment (CCA) technology is to find the signals of other devices that may exist in the channel through pilot signal detection or energy detection, and judge whether the current channel is idle or not. For example, device 1 is sending a signal to device 2, and device 3 also wants to send a signal to device 2; device 3 first performs a free channel assessment before sending a signal, and after detecting the signal from device 1, it determines that the channel is occupied , so as not to send a signal to device 2 immediately, thereby avoiding the occurrence of interference. [0003] Furthermore, in order to effectively solve the occurrence of collision (collision), a contention fallback mechanism is introduced. For example, after dev...
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IPC IPC(8): H04W74/08H04W72/04H04W72/08H04W72/54
CPCH04W74/0808H04W74/085H04W72/046H04W72/542H04W16/14H04W16/28H04W74/0825
Inventor 刘洋林英沛黄磊
Owner HUAWEI TECH CO LTD