A control signaling transmission method performed by a forwarder, the method comprising: • receiving control signaling carrying rule matching information, wherein the rule matching information includes classification information and an identifier of a mobile context of a user equipment, wherein: ∘ in a first alternative the classification information includes a network element type of a destination network element for the received control signaling, or, ∘ in a second alternative instead of the first alternative, the classification information includes a signaling type of the received control signaling (step 201); • in the first alternative, obtaining a first processing rule, wherein the obtained first processing rule comprises: ∘ a network element type matching the network element type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ first forwarding routing information, or in the second alternative, obtaining a second processing rule, wherein the obtained second processing rule comprises: ∘ a signaling type of control signaling matching the signaling type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ second forwarding routing information (step 202); and • in the first alternative, forwarding the received control signaling to a next-hop network element according to the first forwarding routing information, or in the second alternative, forwarding the received control signaling to the next-hop network element according to the second forwarding routing information (step 203). • receiving control signaling carrying rule matching information, wherein the rule matching information includes classification information and an identifier of a mobile context of a user equipment, wherein: ∘ in a first alternative the classification information includes a network element type of a destination network element for the received control signaling, or, ∘ in a second alternative instead of the first alternative, the classification information includes a signaling type of the received control signaling (step 201); ∘ in a first alternative the classification information includes a network element type of a destination network element for the received control signaling, or, ∘ in a second alternative instead of the first alternative, the classification information includes a signaling type of the received control signaling (step 201); • in the first alternative, obtaining a first processing rule, wherein the obtained first processing rule comprises: ∘ a network element type matching the network element type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ first forwarding routing information, or in the second alternative, obtaining a second processing rule, wherein the obtained second processing rule comprises: ∘ a signaling type of control signaling matching the signaling type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ second forwarding routing information (step 202); and ∘ a network element type matching the network element type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ first forwarding routing information, or ∘ a signaling type of control signaling matching the signaling type contained in the classification information of the received control signaling, ∘ an identifier of a mobile context matching the identifier of the mobile context contained in the received control signaling, and ∘ second forwarding routing information (step 202); and • in the first alternative, forwarding the received control signaling to a next-hop network element according to the first forwarding routing information, or in the second alternative, forwarding the received control signaling to the next-hop network element according to the second forwarding routing information (step 203).