US 2017/0367058 A1 · LATENCY REDUCTION IN LTE SYSTEMS

Abstract

Systems, methods, and instrumentalities are disclosed for a wireless transmit/receive unit (WTRU) autonomously synchronizing. For example, a WTRU may be configured to receive a downlink timing synchronization. The WTRU may be configured to determine a synchronization signal. The WTRU may be configured to determine a synchronization mode. The synchronization mode may be RRC CONNECTED mode. The synchronization mode may be RRC IDLE mode. The WTRU may communicate data to the network while in an unsynchronized state in an RRC IDLE and/or an RRC CONNECTED mode. The communication of data while unsynchronized may reduce latency relative to one or more of a random access channel (RACH) procedure, a resource radio control (RRC) connection establishment procedure, or a data packet scheduling, for example.

Claims23

Dependent claims

A method for communicating data performed by a wireless transmit/receive unit (WTRU), the method comprising:

determining, by the WTRU, that at least one of:
control plane data or user plane data is available for transmission to a network;
determining, by the WTRU, that the WTRU is in at least one of:
a radio resource control (RRC) IDLE mode or a RRC CONNECTED mode;
determining, by the WTRU, that the WTRU is in an unsynchronized state relative to the network;
determining a spectrum operational mode (SOM) for a transmission, the SOM indicating at least one of:
a subcarrier spacing, a transmission time interval (TTI) length, or a waveform for the transmission;
sending the transmission from the WTRU in the unsynchronized state, via a physical uplink channel to the network, the transmission including:
the at least one of the control plane data or the user plane data;
and
an uplink timing synchronization request;
and
receiving, by the WTRU, at least one of a timing advance command (TAC) or a transmit power command (TPC) from the network in response to the transmission.

10 more elements

Dependencies are inferred from the claim text.

Latency reduction in lte systems

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Latency reduction in lte systems

Life of this patent

Abstract

Claims23