  We consider an erasure multi-way relay channel (EMWRC) in which several users
share their data through a relay over erasure links. Assuming no feedback
channel between the users and the relay, we first identify the challenges for
designing a data sharing scheme over an EMWRC. Then, to overcome these
challenges, we propose practical low-latency and low-complexity data sharing
schemes based on fountain coding. Later, we introduce the notion of end-to-end
erasure rate (EEER) and analytically derive it for the proposed schemes. EEER
is then used to calculate the achievable rate and transmission overhead of the
proposed schemes. Using EEER and computer simulations, the achievable rates and
transmission overhead of our proposed schemes are compared with the ones of
one-way relaying. This comparison implies that when the number of users and the
channel erasure rates are not large, our proposed schemes outperform one-way
relaying. We also find an upper bound on the achievable rates of EMWRC and
observe that depending on the number of users and channel erasure rates, our
proposed solutions can perform very close to this bound.
