Abstract:
Ultra reliable low latency communication (URLLC)
is one of the main goals in 5G. URLLC requires highly reliable
and low latency transmission of safety critical and control
packets. Slotted ALOHA forms one of the widely used access
schemes in cellular communication. In this paper, we study the
performance of URLLC packet transmissions utilizing slotted
ALOHA and propose a prioritized access mechanism to provide
low latency and high reliability transmission of delay critical
packets. We consider two types of traffic, namely, regular
traffic and URLLC traffic. URLLC packets have stringent delay
requirements, thus, they are provided high priority access to the
channel. Via analytical formulation, we obtain the packet delay
distribution function for both URLLC and regular packets and
formulate an optimization problem to maximize the reliability
of regular packets given that the URLLC packets meet their
required reliability threshold. Results show that by enabling prioritized access to URLLC packets, their reliability requirements
can be met, while at the same time, regular packet transmission
can make most use of the remaining channel.
