Re-allocation request method, and re-allocation method and device

Disclosed are a re-allocation request method, and a re-allocation method and device. The re-allocation request method comprises: a communication station receives an allocation message, the allocation message being configured to indicate the triggering condition for initiating a re-allocation request; the communication station monitors network performance parameters according to the allocation message; when the network performance parameters satisfy the triggering condition, the communication station initiates a re-allocation request. The prevention invention solves the problems caused by non-standard re-allocation requests in prior art, so that the re-allocation requests are more standardized, thereby avoiding useless re-allocation requests, enhancing the resources allocation rationality, reducing the extra signaling costs caused by inappropriate resources allocation, and lowering processing delays.