US 2019/0104560 A1 · Method of Data Recovery with Uplink Switching

Abstract

A method of data recovery with uplink switching for dual connectivity (DC) is proposed. A UE establishes two data radio bearers for simultaneous data transmission under DC. When the UE receives a command to switch from using two paths to using a single path for uplink transmission, packets that have been pre-processed by the RLC entity on the “deactivated” leg are retransmitted by a transmitting PDCP entity to the RLC entity for the “active” leg. The transmitting PDCP entity performs retransmission of certain unsent PDCP PDUs that are previously submitted to the RLC entity that is now deactivated, and retransmits to the RLC entity that is still active. The unsent PDCP PDUs are defined as those PDCP PDUs that have been pre-processed by the deactivated RLC entity but have either not been transmitted at all or the successful delivery has not been confirmed by the lower layers.

Claims18

Dependent claims

A method comprising:

establishing a first data radio bearer (DRB) with a first base station and a second DRB with a second base station by a user equipment (UE) for simultaneous data transmission under dual connectivity in a wireless communication network;
routing a first plurality of Packet Data Convergence Protocol (PDCP) PDUs from a PDCP entity to a first radio link control (RLC) entity associated with the first DRB and routing a second plurality of PDCP PDUs from the PDCP entity to a second RLC entity associated with the second DRB;
receiving a configuration from the network that configures the UE to deactivate the second data radio bearer for data transmission;
and
retransmitting a subset of PDCP PDUs of the second plurality of PDCP PDUs to the first RLC entity.

2 more elements

Dependencies are inferred from the claim text.

Method of Data Recovery with Uplink Switching

Life of this patent

Method of Data Recovery with Uplink Switching

Life of this patent

Abstract

Claims18