A method of collecting terminal-related information of a first mobility management entity, MME,, the method comprising: receiving a message that includes identification information on a node, which stores a context of a terminal, and additional identification information; determining whether the first MME stores the context of the terminal; if the first MME does not store the context of the terminal, determining whether a type of the identification information on the node corresponds to an SGSN, serving, general packet radio service, GPRS node; and if the type of the identification information on the node corresponds to the SGSN: receiving (750-b-2) a first context of the terminal from the SGSN, receiving (750-c-2) a second context of the terminal from a second MME corresponding to the additional identification information, characterised in that the method further comprises: identifying a new authentication vector of the terminal based on a key set identifier, KSI, received from the terminal or a third MME, and creating the context of the terminal by combining the first context of the terminal received from the SGSN and the second context of the terminal received from the second MME based on the new authentication vector. receiving a message that includes identification information on a node, which stores a context of a terminal, and additional identification information; determining whether the first MME stores the context of the terminal; if the first MME does not store the context of the terminal, determining whether a type of the identification information on the node corresponds to an SGSN, serving, general packet radio service, GPRS node; and if the type of the identification information on the node corresponds to the SGSN: receiving (750-b-2) a first context of the terminal from the SGSN, receiving (750-c-2) a second context of the terminal from a second MME corresponding to the additional identification information, characterised in that the method further comprises: identifying a new authentication vector of the terminal based on a key set identifier, KSI, received from the terminal or a third MME, and creating the context of the terminal by combining the first context of the terminal received from the SGSN and the second context of the terminal received from the second MME based on the new authentication vector. receiving (750-b-2) a first context of the terminal from the SGSN, receiving (750-c-2) a second context of the terminal from a second MME corresponding to the additional identification information, characterised in that the method further comprises: identifying a new authentication vector of the terminal based on a key set identifier, KSI, received from the terminal or a third MME, and creating the context of the terminal by combining the first context of the terminal received from the SGSN and the second context of the terminal received from the second MME based on the new authentication vector. identifying a new authentication vector of the terminal based on a key set identifier, KSI, received from the terminal or a third MME, and creating the context of the terminal by combining the first context of the terminal received from the SGSN and the second context of the terminal received from the second MME based on the new authentication vector.