Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Random Access Protocol for Massive MIMO: Strongest-User Collision
  Resolution (SUCR)   Wireless networks with many antennas at the base stations and multiplexing of
many users, known as Massive MIMO systems, are key to handle the rapid growth
of data traffic. As the number of users increases, the random access in
contemporary networks will be flooded by user collisions. In this paper, we
propose a reengineered random access protocol, coined strongest-user collision
resolution (SUCR). It exploits the channel hardening feature of Massive MIMO
channels to enable each user to detect collisions, determine how strong the
contenders' channels are, and only keep transmitting if it has the strongest
channel gain. The proposed SUCR protocol can quickly and distributively resolve
the vast majority of all pilot collisions.

11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con