Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interference mitigation techniques for a dense heterogeneous area
  network in machine-to-machine communications   With the advent of Machine-to-Machine (M2M) communications, various
networking consumer industrial and autonomous systems exchange messages in the
real world in order to achieve their objectives. Parts of these systems are
comprised of short-range wireless networks in the form of clusters that
collectively cover a large geographical area. In these clusters, the nodes that
represent the cluster heads need to deal with two types of communications: one
is within the cluster and the other is from the cluster to the sink node. As
the number of clusters increases, it takes multiple hops for the cluster head
to forward data to the sink node, thus resulting in a low packet delivery rate
and throughput. To solve this problem, we propose a heterogeneous area network
in which the cluster head is equipped with two types of radios: the IEEE
802.15.4 and IEEE 802.11 radios. The former is for the devices within the
cluster to communicate, whereas the latter is for the cluster heads to
communicate to the sink node. Although the IEEE 802.11 links increase the link
capacity, the IEEE 802.11 radio and the IEEE 802.15.4 radio might share the 2.4
GHz unlicensed band, thus giving rise to the inter-network collisions or
interference. To tackle this problem and to maintain decent Qualityof-Service
(QoS) for the network, we subsequently present two interference mitigation
techniques, in which a Blank Burst (BB) period is proposed so that the IEEE
802.15.4 radios can be suspended while the IEEE 802.11 radios are active.
Simulation results show the proposed two methods can effectively mitigate the
inter-network collisions and are superior to the existing technique, which uses
an adaptive aggregation technique to mitigate the inter-network collisions.

17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con