Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relay-aided Random Access for Energy-Limited Devices in the IoT   In the Internet-of-Things (IoT), random access is employed for devices to
share a common access channel in packet transmission with low signaling
overhead. Although a retransmission strategy is necessary for packet collision
resolution, it might be prohibitive for some devices due to energy and
complexity constraints. In this paper, we consider a novel relay-aided random
access (RARA) scheme where re-transmissions are carried out by relay nodes, not
devices. Thanks to multipacket reception with multiple copies of collided
signals forwarded by relay nodes, a receiver is able to recover multiple
collided packets simultaneously in RARA. As a result, devices of limited
complexity and energy source can enjoy reliable transmission using RARA, and
the throughput can approach 1 with a large number of relay nodes.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph