Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contention Intensity based Distributed Coordination for V2V Safety
  Message Broadcast   In this paper, we propose a contention intensity based distributed
coordination (CIDC) scheme for safety message broadcast. By exploiting the
high-frequency and periodical features of the safety message broadcast, the
application-layer design of the CIDC enables each vehicle to estimate the
instantaneous channel contention intensity in a fully distributed manner. With
the contention intensity information, the MAC layer design of CIDC allows
vehicles to adopt a better channel access strategy compared to the 802.11p.
This is because CIDC selects the initial back-off counter for each new packet
deterministically, i.e., based on the contention intensity, instead of
randomly. The proposed CIDC is modeled, and key performance indicators in terms
of the packet collision probability and average contention delay, are derived.
It is shown that the proposed change in the initial counter selection leads to
a system model completely different from the classic Markov chain based model.
Moreover, the proposed CIDC, fully distributed and compatible with the 802.11p,
can achieve both a much lower collision probability and a smaller contention
delay compared with 802.11p at the cost of a small communication and
computation overhead. Extensive simulation results demonstrate the
effectiveness of the CIDC in both of the accurate and the erroneous contention
intensity estimation scenarios.

30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th