Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Outage of Periodic Downlink Wireless Networks with Hard Deadlines   We consider a downlink periodic wireless communications system where multiple
access points (APs) cooperatively transmit packets to a number of devices, e.g.
actuators in an industrial control system. Each period consists of two phases:
an uplink training phase and a downlink data transmission phase. Each actuator
must successfully receive its unique packet within a single transmission phase,
else an outage is declared. Such an outage can be caused by two events: a
transmission error due to transmission at a rate that the channel cannot
actually support or time overflow, where the downlink data phase is too short
given the channel conditions to successfully communicate all the packets. We
determine closed-form expressions for the probability of time overflow when
there are just two field devices, as well as the probability of transmission
error for an arbitrary number of devices. Also, we provide upper and lower
bounds on the time overflow probability for an arbitrary number of devices. We
propose a novel variable-rate transmission method that eliminates time
overflow. Detailed system-level simulations are used to identify system design
guidelines, such as the optimal amount of uplink training time, as well as for
benchmarking the proposed system design versus non-cooperative cellular,
cooperative fixed-rate, and cooperative relaying.

8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn