Method of Enhanced Connection Recovery and Loss-Less DATA Recovery

摘要

An enhanced connection recovery upon lost RRC connection due to radio link failure (RLF) or handover failure (HOF) is proposed. A UE first establishes an RRC connection in a source cell in a mobile communication network. Later on, the UE detects a failure event and starts an RRC reestablishment procedure in a target cell to restore the RRC connection. In a first novel aspect, a fast NAS recovery process is applied to reduce the outage time in the target cell. In a second novel aspect, context fetching is used to reduce the outage time in the target cell. In a third novel aspect, a loss-less reestablishment procedure is proposed to reduce data loss during the connection recovery.

主权项

1. A method for enhanced connection recovery, the method comprising:
receiving a radio resource control (RRC) reestablishment request message from a user equipment (UE) by a target base station in a mobile wireless communication network; transmitting an X2 radio link failure (RLF) indication to a serving base station, wherein the X2 RLF indication comprises a data-forwarding request; receiving an X2 message transfer comprising of packet data convergence protocol (PDCP) serial number (SN) status from the serving base station; and transmitting an RRC reestablishment response message to the UE.