US 2017/0303303 A1 · Physical Random Access Channel Design in eLAA

Abstract

A physical random access channel (PRACH) waveform design to satisfy the requirements on the occupied channel bandwidth in eLAA wireless communications network is provided. In one alternative, PRACH comprises multiple segments in the time/frequency domain in one subframe. In another alternative, PRACH comprises multiple segments in the time/frequency domain across two or more subframes by using inter-subframe hopping. In one advantageous aspect, PDCCH triggers the dynamic allocation of the PRACH resource to facilitate the listen-before-talk (LBT) channel access procedure in unlicensed carriers. The aperiodic and dynamic allocation of PRACH resource improves efficiency and PRACH success rate.

Claims22

Dependent claims

A method comprising:

performing a downlink listen before talk (LBT) channel access procedure by a base station in an orthogonal frequency division multiplexing (OFDM) wireless communications network;
transmitting a physical layer signaling over a physical downlink control channel (PDCCH) to a user equipment (UE) upon the successful LBT procedure;
triggering physical random access channel (PRACH) resource to be allocated to the UE using the physical layer signaling;
and
receiving a PRACH preamble from the UE over the allocated PRACH resource.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/474,094Filed 30 Mar 2017

Priority

1 Apr 2016

Published

19 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04W 72/23
Control channels or signalling for resource management: in the downlink direction of a wireless link, i.e. towards a terminal
H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 5/0053
Arrangements for allocating sub-channels of the transmission path: allocation of signalling, i.e. of overhead other than pilot signals
H04W 56/0045
Compensating for timing error of reception due to propagation delay: compensating for timing error by altering transmission time

Physical Random Access Channel Design in eLAA

Life of this patent

Physical Random Access Channel Design in eLAA

Life of this patent

Abstract

Claims22