Address allocation method, apparatus, core network, node, network system and medium

An address allocation method, comprising:

• in a case of establishing a session, configuring at least two uplink addresses and sending the at least two uplink addresses to an access network, wherein the access network is a connectivity network formed by a coupling of at least two network element nodes and part of the at least two uplink addresses are used for being allocated among the at least two network element nodes, wherein a mode of allocating an uplink address to a network element node includes:
• randomly selecting one uplink address from the at least two uplink addresses and performing allocation, or performing allocation according to an order in which the at least two uplink addresses are ranked;
• and
• receiving at least one downlink address sent by the access network and determining usage of the at least two uplink addresses,
• receiving release notification information, wherein the release notification information comprises:
• identification information of an uplink address allocated to the at least two network element nodes;
• and
• releasing, according to the release notification information, an uplink address not allocated to the at least two network element nodes,
• wherein the session is a splitting session and the session is configured on the at least two network element nodes;
• wherein the determining the usage of the at least two uplink addresses further comprises determining the usage of the at least two uplink addresses according to a preset mapping relation between uplink addresses and downlink addresses.