Embodiments of the present application provide a method, device and system for triggering a scheduling request (SR), capable of meeting QoS requirements of different services in an NR V2X system while avoiding or reducing unnecessary SR triggers. The method comprises: a network device sends a first message to a terminal device, the first message comprising a first identifier and one or more configuration parameters corresponding to the first identifier, and the first identifier being the identifier of a first logical channel; the first logical channel is the logical channel of a sidelink radio bearer. Or, the first identifier has a mapping relationship with the first logical channel, for example, the first identifier is the identifier of a logical channel group to which the first logical channel belongs. After the terminal device receives the first message from the network device, if the first logical channel triggers a first regular sidelink buffer status report (SL BSR) and is not cancelled, the terminal device triggers the SR according to the first identifier and the one or more configuration parameters corresponding to the first identifier.
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