Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Performance Improvements in Heterogeneous Wireless Networks for First
  Responders   Efficient communications are crucial for disaster response and recovery.
However, most current public safety land mobile radio (LMR) networks only
provide narrowband voice service with limited support of low-speed data
services. In this paper, we study to enhance the interoperability of LMR with
commercial wireless cellular networks, by which a wide variety of benefits can
be offered to disaster responders, including new multimedia services, increased
data rates and low cost devices. Our approach is based on Session Initial
Protocol (SIP) and a joint radio resource management framework. In addition, an
optimal radio resource management scheme is proposed to maximize the overall
radio resource utilization and at the same time guarantee service availability
and continuity quality of service (QoS) for disaster responders. The
effectiveness of the proposed approach is illustrated by numerical examples.

2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph