Traditional wireless ad hoc medium access control (MAC) protocols often utilize control frames such as Request-ToSend (RTS), Clear-To-Send (CTS) and Acknowledgement (ACK) to reliably delivery unicast data. However, little effort has been given to improve the reliable delivery of broadcast data. Often, broadcast data are transmitted blindly without any consideration of hidden terminals. In this ...

In this paper we describe the IEEE 802.16 Orthogonal Frequency Division Multiplexing (OFDM) and the 802.16 Orthogonal Frequency Division Multiple Access (OFDMA), Medium Access Control (MAC) protocols, both of which are key elements of the Worldwide Interoperability for Microwave Access Forum (WiMAX) deployments. We also discuss the types of provisioning and Quality of Service (QoS) that can be ...

Multimedia service integration over wireless networks poses a number of signi cant challenges to the Medium Access Control (MAC) level. Future MAC schemes need to coordinate the access to the media for heterogeneous services requiring a wide variety of Quality of Service (QoS). These include new adaptive multimedia services capable of gracefully responding to the reduction in the available band...

In this paper, an IEEE 802.15.6 wireless body area networks (WBAN) medium access control protocol is developed to support a wireless USB (WUSB) application as a protocol adaptation layer (PAL). Due to portable and wearable nature, the WUSB over IEEE 802.15.6 hierarchical medium access control (MAC) protocol has to support the power saving operation and integrate WUSB transactions with WBAN traf...

In this paper cluster-based hybrid MAC (CB-HMAC) protocol, based on IEEE 802.15.4 is proposed for smart home networks. The CB-HMAC specially designed short packet transmission in a dense network environment. Simulation results show that the more energy-efficient than other medium access control (MAC) protocols without sacrificing much delay and throughput.

In this paper, we propose an approach to vehicle collision-avoidance system by broadcasting vehicles’ driving conditions via Inter-Vehicle Communication (IVC) networks. We study the use of Elimination Yield Nonpreemptive Priority Multiple Access (EY-NPMA) Medium Access Control (MAC) protocol. This protocol is used in the High Performance Radio LAN (HIPERLAN) system being developed in Europe. In...

Despite some scepticism, cross-layer optimization has largely been accepted as an indispensable part of protocol design for wireless networks. In this respect, generalized network utility maximization (GNUM) has become a widely employed systematic approach for understanding the interconnections between layers and designing efficient cross-layer protocols. In this paper we adopt the GNUM approac...

Medium access control (MAC) protocols in a cognitive radio network (CRN) are required to increase spectral efficiency and achieve high data rate for secondary users (SUs). Many MAC protocols use a single control channel with a bottleneck problem. In this paper, we propose a multichannel MAC protocol using dicontiguous orthogonal frequency division multiplexing (D-OFDM) in a CRN. Since D-OFDM te...

In a wireless LAN (WLAN) based on IEEE 802.11, supporting multiple classes of services with QoS constraints in MAC layer is very important. In this paper, we propose a class-based analytical model to support multiple traffic classes. Through investigating the relationship between access control parameters, such as contention window (CW) sizes and inter-frame space (IFS) under QoS constraints, w...