Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mathematical model of LoRaWAN channel access   While 3GPP has been developing NB-IoT, the market of Low Power Wide Area
Networks has been mastered by cheap and simple Sigfox and LoRa/LoRaWAN
technologies. Being positioned as having an open standard, LoRaWAN has
attracted also much interest from the research community. Specifically, many
papers address the efficiency of its PHY layer. However MAC is still
underinvestigated. Existing studies of LoRaWAN do not take into account the
acknowledgement and retransmission policy, which may lead to incorrect results.
In this paper, we carefully take into account the peculiarities of LoRaWAN
transmission retries and show that it is the weakest issue of this technology,
which significantly increases failure probability for retries. The main
contribution of the paper is a mathematical model which accurately estimates
how packet error rate depends on the offered load. In contrast to other papers,
which evaluate LoRaWAN capacity just as the maximal throughput, our model can
be used to find the maximal load, which allows reliable packet delivery.

31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom