Network device and operation method for network device

A method of operating a network device in a network system including a plurality of network devices, the method comprising:

• identifying whether specific information is included in an uplink message received from a specific terminal device, wherein the specific information includes subscription-related information indicating that (i) the specific terminal device has a subscription to a specific network device among the plurality of network devices and (ii) the specific terminal device is locally managed by the specific network device;
• determining whether to route the uplink message on the basis of the identification of the specific information;
• and
• deciding the specific network device to which the uplink message is routed on the basis of the specific information when routing the uplink message is determined,
• wherein each network device of the network devices in the network system locally manages terminal devices which subscribes to each network device.

A network device in a network system including a plurality of network devices, the network device comprising:

• a receiver, implemented by a processor and including electrical circuits or integrated circuits, configured to receive a response packet of a specific downlink packet transmitted to a terminal device;
• a decision unit, implemented by a processor and including electrical circuits or integrated circuits, configured to analyze whether the response packet indicates the specific downlink packet is generated by a specific network device among the plurality of network devices in the network system;
• and
• a routing unit, implemented by a processor and including electrical circuits or integrated circuits, configured to route the response packet to the specific network device when the specific network device is a network device other than the network device receiving the response packet.

A method of operating a network device in a network system including a plurality of network devices, the method comprising:

• receiving a response packet of a specific downlink packet transmitted to a terminal device;
• analyzing whether the response packet indicates the specific downlink packet is generated by a specific network device among the plurality of network devices in the network system;
• and
• routing the response packet to the specific network device when the specific network device is a network device other than the network device receiving the response packet.