End-to-end latency guarantee for downlink traffic

Abstract

A method and a network device for achieving end-to-end latency guarantees, where the method includes: receiving, by a network device in a core network, a latency guarantee service (LGS) request message from a source node in a data network (DN), the LGS request message requesting to transmit traffic to an end device and comprising one or more of a LGS indicator, an end-to-end packet delay budget (PDB) requirement, a maximum flow rate, and an end device identifier; determining a remaining PDB for the core network and a transport network; sending an LGS slice selection request to a network function, including one or more of the remaining PDB, the maximum flow rate, and the identifier; and receiving an LGS response from the network function, which identifies an LGS slice for the requested traffic and indicates whether the LGS slice is able to satisfy the remaining PDB and the maximum flow rate.