Listen before talk (LBT) failure recovery method, user equipment and base station
A technology of listening first, talking first, and recovery method, which is applied in the field of communication, which can solve problems such as large resource overhead and long delay in business data transmission, and achieve the effect of reducing resource consumption and
Active Publication Date: 2021-05-07
VIVO MOBILE COMM CO LTD
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Problems solved by technology
[0005] The embodiment of the present invention provides a method for notifying the uplink BWP switching, the user equipment and the base station solve the problem of large resource overhead in the process of notifying the base station of the UE switching from the original UL BWP to the current UL BWP, and service data The problem of large transmission delay and the problem of recovering from LBT failure
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[0030] As mentioned above, when NR operates on an unlicensed frequency, before using a certain channel to send data, the transmitter of UE or base station (gNB) should detect the channel according to the detection mechanism of LBT to determine whether the channel is available. use. The specific detection method is: the transmitter measures the power received on the channel, and if the received power is higher than a preset value, then it is determined that the channel is occupied. On the contrary, the channel is determined to be in an unoccupied state, and the unoccupied channel can be used for NR signal transmission. Wherein, the preset value is a threshold used to represent whether the channel is in an occupied state.
[0031] When the UE performs LBT, if the channel is occupied by other devices, the LBT may fail. According to the conclusion of 3GPP RAN2: if the number of LBT failures of the UE within a preset period reaches the preset maximum number, then the UE will dete...
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Disclosed in an embodiment of the present invention are a listen before talk (LBT) failure recovery method, user equipment and a base station. The method comprises the steps of when a user equipment (UE) is switched from a second uplink bandwidth part (BWP) to a first uplink BWP, the UE sends first information to the base station on a configured uplink channel, the first information being used to notify the base station UE to switch from the second uplink BWP to the first uplink BWP, the first information being used to notify the base station UE to switch from the second uplink BWP to the first uplink BWP, the uplink channel comprises at least one of a sounding reference signal (SRS), a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH); and the UE receives second information sent by the base station, wherein the second information is used for notifying the UE that the uplink BWP is successfully switched. According to the embodiment of the invention, when the uplink BWP switching occurs in the UE, the first information is sent to the base station through the configured uplink channel to inform the base station that the UE switches the uplink BWP, so that the resource consumption and the transmission time delay of service data are reduced.
Description
technical field [0001] Embodiments of the present invention relate to the communication field, and in particular to a recovery method for a listen before talk (LBT) failure, a user equipment, and a base station. Background technique [0002] When NR operates on an unlicensed frequency, if the user equipment (user equipment, UE) uses a certain channel (such as a channel of 20MHz) to send a message, the UE needs to detect it according to the listen before talk (LBT) Mechanism to detect the channel to determine whether the channel is available. When performing LBT, if the channel is occupied by other devices, it is determined that the LBT fails, that is, the UE cannot use the channel for transmission. If the number of LBT failures within the preset period reaches the preset threshold, it is determined that the currently used uplink bandwidth part (uplink band width part, UL BWP) is unavailable, where the uplink part bandwidth is also referred to as an uplink part frequency ban...
Claims
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IPC IPC(8): H04W74/08H04W76/19
CPCH04W74/0808H04W76/19
Inventor εθΏε
Owner VIVO MOBILE COMM CO LTD