Reservation Time Division Multiple Access Research Articles

A Competent Ad-hoc Sensor Routing Protocol for Energy Efficiency in Mobile Wireless Sensor Networks

In wireless sensor networks (WSNs), energy utilization plays an essential part in the survival time (survivability) of the network. All the network aspects are redesigned to work in the WSN for lesser energy consumption. In this regard, routing protocol and dynamic topology are very crucial aspects to be noted. In this work, we present a competent ad-hoc sensor routing (CASeR) protocol for delay reduction, reliable data communication, and efficient energy usage in mobile WSNs (MWSNs). It is aimed to cope up with challenging requirements of the rising limited battery powered technologies, which requires low energy consumption and end-to-end delay (EED). Further, the CASeR uses reservation based channel allocation using reservation time division multiple access mobility adaptive cross-layer in dynamic networks and cost based multi-hop communication for packet forwarding and gradient maintenance. The MWSN routing protocols, robust ad-hoc sensor routing, mobility adaptive cross-layer routing, and proactive highly ambulatory sensor routing as well as the mobile ad-hoc network protocols, optimized link state routing and ad-hoc on demand distance vector, measure up with the CASeR. The simulation results show improvements over other routing protocols in energy consumption, EED, queuing delay, and reliable data communication. The competence of this protocol makes it highly suitable to minimize time delay in target applications.

An adaptive reservation time division multiple access control protocol for robot inter-communication

In autonomous distributed robot systems, many robots cooperate together to carry out many difficult tasks that single robots cannot realise. But, in order to cooperate together the robots should communicate with each other. Therefore, the inter-communication among robots is a very important problem to be solved. In this paper, we propose an Adaptive Reservation-Time Division Multiple Access (AR-TDMA) medium access control protocol which can realise a real-time communication among robots in a heterogeneous environment by using a reservation mechanism. Also, by using an adaptive time slot allocation method, the protocol has a flexible behaviour and can deal with the changes of number of robots. Furthermore, the proposed protocol can reduce the packet collision probability.

Topology-transparent reservation time division multiple access in multihop ad hoc networks

In this paper, an optimal topology-transparent reservation time division multiple access (OTTR-TDMA) protocol is proposed for multihop ad hoc networks. Our MAC protocol is based on a slotted TDMA architecture in which every slot is divided into reservation phase and data transmission phase. Every node not only transmits data in its assigned slots that are computed by Chlamtac’s algorithm, but it also utilizes free slots among its non-assigned slots through reservation. Through theoretical analysis, we derive the proper parameter for the best performance. We compare our protocol with other TDMA protocols and find that it gives better performance. Simulation results show that they are consistent with our analytical results.

Topology-transparent reservation time division multiple access protocol with MIMO links in multihop ad hoc networks

The transmission collisions of topology-transparent reservation time division multiple access protocol with MIMO links are solved by dynamically trading off the MIMO link transmission capacity and its anti-interference ability. Through theoretical analysis, we derive the guaranteed throughput and optimal frame length. Results show that the guaranteed throughput will be improved greatly by dynamic allocation of MIMO transmission capacity and its anti-interference ability. Moreover, the protocol is immune to topology change.

An adaptive access control scheme for a reservation TDMA/adaptive modulation system

AbstractIn realizing multimedia communication systems in land mobile communications, high‐frequency efficiency must be achieved, while satisfying various requirements for transmission quality depending on the media. In the proposed system, voice and the data of long message size are transmitted by the reservation TDMA (time division multiple access) system, and data of shorter message size are transmitted by the slotted ALOHA system, using slots which are not used for voice or long data. In order to ensure a larger number of idle slots for short data transmission, the voice activation technique and adaptive modulation are utilized in voice transmission. This paper considers the reservation TDMA/adaptive modulation system, and the transmission of voice/data integrated traffic at high speed and high efficiency through the common radio channel. An adaptive access control system is proposed in which the threshold for separating long and short data is automatically controlled according to traffic variation. It is verified by a simulation that the proposed system is effective in integrating data with high efficiency and in reducing delay in data transmission, while maintaining the voice transmission capacity. © 2002 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 85(11): 77–86, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.1140

Dynamic reservation TDMA protocol for wireless ATM networks

A dynamic reservation time division multiple access (DR-TDMA) control protocol that extends the capabilities of asynchronous transfer mode (ATM) networks over the wireless channel is proposed in this paper. DR-TDMA combines the advantages of distributed access and centralized control for transporting constant bit rate (CBR), variable bit rate (VBR), and available bit rate (ABR) traffic efficiently over a wireless channel. The contention slots access for reservation requests is governed by the framed pseudo-Bayesian priority (FPBP) Aloha protocol that provides different access priorities to the control packets in order to improve the quality-of-service (QoS) offered to time sensitive connections. DR-TDMA also features a novel integrated resource allocation algorithm that efficiently schedules terminals' reserved access to the wireless ATM channel by considering their requested bandwidth and QoS. Integration of CBR, voice, VBR, data, and control traffic over the wireless ATM channel using the proposed DR-TDMA protocol is considered in this paper. Simulation results are presented to show that the protocol respects the required QoS of each traffic category while providing a highly efficient utilization of approximately 96% for the wireless ATM channel.

Block Reservation Time Division Multiple Access (BRTDMA) Protocol for a High Capacity Wireless Network

Next generation high capacity wireless networks need to support various types of traffic, including voice, video and data, each of which have different Quality of Service (QoS) requirements for successful transmission. This paper presents an advanced reservation packet access protocol BRTDMA (Block Reservation Time Division Multiple Access) that can accommodate voice and data traffic with equal efficiency in a wireless network. The proposed BRTDMA protocol has been designed to operate in a dynamic fashion by allocating resources according to the QoS criteria of voice and data traffic. Most of the existing reservation protocols offers reservation to voice traffic while data packets are transmitted using contention mode. In this paper we propose a block reservation technique to reserve transmission slots for data traffic for a short duration, which minimizes the speech packet loss and reduce the end-to-end delay for wireless data traffic. The optimum block reservation length for data traffic has been studied in a cellular mobile radio environment using a simulation model. Simulation results show that the BRTDMA protocol offers higher traffic capacity than standard PRMA protocol for integrated voice and data traffic and offers flexibility in accommodating multimedia traffic.