The present invention provides a method for determining resource allocation, a method for instructing resource allocation, a terminal, and a network-side device. A method for determining resource allocation according to the present invention is applied to a terminal, the method comprising: determining the number N of bits of a resource allocation indication field in DCI; determining a BWP in which a data channel is located based on the DCI; and determining resource allocation in the BWP in which the data channel of the data channel is located based on the information in the resource allocation indication field in the DCI. includes
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