Contention-resolution rach-less transmissions

Abstract

There is provided a method for performing random access without Msg1 by a UE, the method comprising: transmitting, to a base station, a contention-based transmission; wherein transmitting the contention-based transmission comprises: selecting, from among a set of transmission resources in a transmission window configured for random access without Msg1, at least one transmission resource; and transmitting, in the selected transmission resource, the contention-based transmission; wherein the contention-based transmission comprises at least one of user plane data or control plane signalling.