Coded slotted access based random-access scheme

A first user equipment (UE) device comprising:

• a transmitter configured to transmit, to a base station, a first plurality of copies of a first Random-Access Request Signal (RRS) transmitted in a first set of resources selected from a Random-Access Channel (RACH) resource pool, the first plurality of copies comprising a first RRS first copy transmitted in a first time resource;
• and
• a receiver configured to receive, from the base station, an uplink grant message transmitted at least partially in response to the base station removing interference to correctly detect the first RRS first copy in the first time resource, the removing of the interference being performed based on a second plurality of copies of a second RRS transmitted by a second UE device in a second set of resources selected from the RACH resource pool, the second plurality of copies comprising a second RRS first copy transmitted in the first time resource and a second RRS second copy transmitted in a second time resource, the removing of the interference comprising removing interference caused by the second RRS first copy using the second RRS second copy correctly detected in the second time resource.