Adaptive Configuration of Mobile Roadside Units for the Cost-Effective Vehicular Communication Infrastructure

Table 1

Previous work on RSUs.

RSU Type	Year	Reference	Main Features
fRSU	2014	[4]	(i) Roads are divided into cells; (ii) More fRSUs are deployed in a cell with more vehicles
fRSU	2013	[5]	(i) Roads are divided into zones; (ii) Less fRSUs are deployed in a zone with more vehicles
fRSU	2013	[6]	(i) More intersections are covered by less fRSUs
fRSU	2015	[7]	(i) Roads are divided into segments; (ii) More fRSUs are deployed in a cell with less vehicles
mRSU	2011	[8]	(i) Certain vehicles are used as mobile gateways (mRSUs) to extend the coverage of fRSUs; (ii) A position-based routing protocol based on V2V and V2I communications is proposed; (iii) No deployment issue of mRSUs is covered
mRSU	2010	[9]	(i) Buses (mRSUs) form mobile infrastructure; (ii) A position-based routing protocol is proposed based on the transmission quality of each road segment; (iii) No deployment issue of mRSUs is covered
mRSU	2010	[10]	(i) Buses (mRSUs) form mobile infrastructure; (ii) Each vehicle registers with a bus; (iii) A position-based routing protocol is proposed based on the transmission quality of each road segment; (iv) No deployment issue of mRSUs is covered
mRSU	2013	[11]	(i) Buses (mRSUs) form mobile infrastructure; (ii) Each vehicle registers with a bus or fRSU that can have the longest registration time; (iii) No deployment issue of mRSUs is covered
fRSU	2016	[12]	(i) Two types of mRSUs are defined according to whether the mRSU is controllable by an organization or not; (ii) According to the RSU types and the given budget, the placement of RSUs is determined; (iii) Uncontrollable mRSUs are given with the largest portion of the budget
mRSU	2017	[13]