A method, applied to a second V2X device, for feedback information transmission between vehicle to everything, V2X, devices, comprising: receiving first user data from a first V2X device; determining a feedback time window for the first user data based on end time of the first user data transmission; and transmitting hybrid automatic repeat request, HARQ, feedback information for the first user data to the first V2X device in the feedback time window for the first user data; determining the feedback time window for the first user data based on the end time of the first user data transmission comprises: acquiring time window offset information indicating a first offset duration between a low boundary and the end time of the first user data transmission, herein referred as T1, and indicating a second offset duration between an upper boundary of the feedback time window for the first user data and the end time of the first user data transmission, herein referred as T2, wherein T1 and T2 are preconfigured as fixed values in first V2X device and the second V2X device by a base station and different values of (T1, T2) pairs are configured for user data corresponding to different service types of user data; and determining the feedback time window for the first user data based on the time window offset information and the end time of the first user data transmission. receiving first user data from a first V2X device; determining a feedback time window for the first user data based on end time of the first user data transmission; and transmitting hybrid automatic repeat request, HARQ, feedback information for the first user data to the first V2X device in the feedback time window for the first user data; determining the feedback time window for the first user data based on the end time of the first user data transmission comprises: acquiring time window offset information indicating a first offset duration between a low boundary and the end time of the first user data transmission, herein referred as T1, and indicating a second offset duration between an upper boundary of the feedback time window for the first user data and the end time of the first user data transmission, herein referred as T2, wherein T1 and T2 are preconfigured as fixed values in first V2X device and the second V2X device by a base station and different values of (T1, T2) pairs are configured for user data corresponding to different service types of user data; and determining the feedback time window for the first user data based on the time window offset information and the end time of the first user data transmission. acquiring time window offset information indicating a first offset duration between a low boundary and the end time of the first user data transmission, herein referred as T1, and indicating a second offset duration between an upper boundary of the feedback time window for the first user data and the end time of the first user data transmission, herein referred as T2, wherein T1 and T2 are preconfigured as fixed values in first V2X device and the second V2X device by a base station and different values of (T1, T2) pairs are configured for user data corresponding to different service types of user data; and determining the feedback time window for the first user data based on the time window offset information and the end time of the first user data transmission. <EOS>