Approach for channel reservation and allocation to improve quality of service in vehicular communications

Abstract

Channel allocation plays an important role in next generation of wireless networks that require huge bandwidth support for various applications. It became very interesting and important research area in vehicular ad hoc network (VANET) as the channel allocation procedure needs to be efficient as the frequency of handoff is high because of the high mobility of the nodes. So, the authors propose a channel allocation algorithm that utilises channel reuse technique, channel borrowing process and the speed of the vehicle to reserve the channel for handoff calls to improve quality of service (QoS) in VANET. The calls are categorised as real-time originating calls, real-time handoff calls, non-real-time originating calls, non-real-time handoff calls and non-real-time transfer calls, and queue is maintained for non-real-time originating calls, which leads to nonreal-time transfer calls. The channel borrowing process is incorporated only for real-time originating calls and real-time handoff calls. The proposed system is modelled using two-dimensional Markov model. The proposed algorithm is simulated and evaluated in terms of QoS parameters as blocking probability, dropping probability and handoff latency. The performance is tested with varying system load, varying number of channels and is compared with legacy systems like cooperative reservation of service channels, CRaSCH, and a new dynamic channel allocation strategy which combines channel reservation with new call queuing, RQS.

A reservation-based call admission control scheme and system modeling in 4G vehicular networks

“…There has been a great body of research on CAC design reported in the literature [1,5,6,[12][13][14][15][16][17][18]. In this section, we highlight a few important papers that mainly focus on reservation-based schemes in cellular and vehicular networks.…”

“…The CAC design for vehicular networks is discussed in [5,15,16], where the vehicular environment and movement has a major impact on the system design. Hence, the macroscopic vehicular modeling (CMVM) was introduced in CAC design in [5] where the macroscopic modeling describes vehicular traffic with aggregate variables such as traffic density, mean speed, etc.…”

“…On the other hand, dynamic channel assignment enables the fixed channel allocation methods to maintain a pre-set range of channels allocated to a cell and then varies based on the users' mobility due to vehicular movement. The CAC proposed in [16] uses fixed channel reuse technique, channel borrowing process, and the speed of the vehicle to reserve the channel for hand-off calls to improve quality of service (QoS) in VANETs. The authors in [14] proposed the idea of channel borrowing for the originating new calls along with the idea of channel adaptation for reserved channels.…”

“…A good CAC design for 4G vehicular networks should be robust enough to support a vast range of hand-off rates. Most of the research on handling hand-off in vehicular networks are trying to use the mobility/traffic pattern to enhance the call admission process [5,15,16,[20][21][22]. In our work, we propose the channel borrowing idea which improves the channel utilization of conventional channel borrowing CAC schemes and therefore results in improved CBP while does not affect CDP.…”

Performance metrics of a multirate resource sharing teletraffic model with finite sources under the threshold and bandwidth reservation policies

“…[3][4][5]), wireless (e.g. [6][7][8]) and optical networks (e.g. [9,10]) show the importance of the policy in teletraffic engineering.…”