  In this work we examine the operation of a node relaying packets from a
number of users to a destination node. We assume multi-packet reception
capabilities for the relay and the destination node. The relay node can
transmit and receive at the same time, so the problem of self interference
arises. The relay does not have packets of its own and the traffic at the
source nodes is considered saturated. The relay node stores a source packet
that it receives successfully in its queue when the transmission to the
destination node has failed. We obtain analytical expressions for the
characteristics of the relay's queue (such as arrival and service rate of the
relay's queue), the stability condition and the average length of the queue as
functions of the probabilities of transmissions, the self interference
coefficient and the outage probabilities of the links. We study the impact of
the relay node and the self interference coefficient on the throughput per
user-source as well as the aggregate throughput.
