A request processing method performed by an access and mobility management function, the method comprising: a.) determining (step 401) a plurality of control plane function entities for a terminal device, wherein each control plane function entity among the plurality of control plane function entities is configured to serve the terminal device; b.) determining (step 402) that the terminal device enters an idle state; c.) receiving (step 403) a first service invocation request from a first control plane function entity among the plurality of control plane function entities, wherein the first service invocation request comprises a first allocation retention priority, ARP, and the first service invocation request is used to request the access and mobility management function to page the terminal device that enters the idle state; the method characterized in that d.) rejecting (step 404) the first service invocation request when the access and mobility management function determines, based on the first service invocation request, that a priority level of the first ARP is lower than or equal to a highest priority level of an ARP of a service invocation request among those already, by the access and mobility management function, processed service invocation requests of the plurality of control plane function entities used for requesting the access and mobility management function to page the terminal device that enters the idle state; and e.) accepting the first service invocation request when the access and mobility management function determines, based on the first service invocation request, that the priority level of the first ARP is higher than the highest priority level of the ARP of the service invocation request among those already, by the access and mobility management function, processed service invocation requests of the plurality of control plane function entities used for requesting the access and mobility management function to page the terminal that enters the idle state. a.) determining (step 401) a plurality of control plane function entities for a terminal device, wherein each control plane function entity among the plurality of control plane function entities is configured to serve the terminal device; b.) determining (step 402) that the terminal device enters an idle state; c.) receiving (step 403) a first service invocation request from a first control plane function entity among the plurality of control plane function entities, wherein the first service invocation request comprises a first allocation retention priority, ARP, and the first service invocation request is used to request the access and mobility management function to page the terminal device that enters the idle state; the method characterized in that d.) rejecting (step 404) the first service invocation request when the access and mobility management function determines, based on the first service invocation request, that a priority level of the first ARP is lower than or equal to a highest priority level of an ARP of a service invocation request among those already, by the access and mobility management function, processed service invocation requests of the plurality of control plane function entities used for requesting the access and mobility management function to page the terminal device that enters the idle state; and e.) accepting the first service invocation request when the access and mobility management function determines, based on the first service invocation request, that the priority level of the first ARP is higher than the highest priority level of the ARP of the service invocation request among those already, by the access and mobility management function, processed service invocation requests of the plurality of control plane function entities used for requesting the access and mobility management function to page the terminal that enters the idle state. <EOS>