Small data transmission

A control plane of a central unit of a network device, comprising:

• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the control plane of the central unit at least to:
• receive, from a distributed unit of the network device, an indication of a subset of data radio bearers configured for a small data transmission for a terminal device;
• and
• transmit, to the distributed unit, a context request message including at least one data radio bearer configured for the small data transmission to be setup corresponding to the received subset of data radio bearers.

A user plane of a central unit of a network device, comprising:

• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the user plane of the central unit at least to:
• receive, from a control plane of the central unit, a request for a bearer context modification, the request comprising an indication of at least one of a first list of data radio bearers to be resumed or a second list of data radio bearers to remain in a suspended state;
• and
• perform, based on the indication, a bearer context modification procedure to resume the first list of data radio bearers.