An Efficient Broadcasting TDPA Protocol for Ad Hoc Networks with Directional Antenna

2013 ◽  
Vol 330 ◽  
pp. 1036-1040
Author(s):  
Zhao Ran He ◽  
Hai Bin Shi
Keyword(s):  
Ad Hoc Networks ◽  
Network Performance ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Network Capacity ◽  
Directional Antenna ◽  
Network Throughput ◽  
Spatial Reuse ◽  
Simulation Results ◽  
Hoc Networks

Directional antenna has tremendous potential in improving the network capacity and anti-jamming compared with omni-directional antenna for ad hoc networks. In this article, a novel MAC protocol called TDPA based on TDMA was presented for ad hoc networks with directional antenna. It improved the spatial reuse by adaptively selecting interference-free angle according to communicating nodes positions, and increased the network throughput and broadcasting efficiency by piggyback retransmission technique. Analysis and simulation results showed that it can significantly improve network performance.

A Power Optimization Algorithm for Ad Hoc Networks with Variable Rate Control

2013 ◽  
Vol 470 ◽  
pp. 611-616
Author(s):  
Xuan Jie Ning ◽  
Hai Zhao ◽  
Mao Fan Yang ◽  
Dan Wu
Keyword(s):  
Ad Hoc Networks ◽  
Rate Control ◽  
Ad Hoc ◽  
Transmission Rate ◽  
Mac Protocol ◽  
Network Capacity ◽  
Data Rate ◽  
Medium Access ◽  
High Data ◽  
Hoc Networks

This paper is concerned with the capacity of ad hoc networks employing pure ALOHA medium access control (MAC) protocol under the effect of different transmission power levels and variable data rate control. The data rate of a certain link is related to the signal to interference plus noise ratio (SINR), and SINR is, in turn, related to the transmitted power and link distance. The increasing power conducts a high data rate, resulting in the high interference of networks. Consequently, the optimum power that yields maximum network throughput is a tradeoff between transmission rate and network interference. Mathematical model analysis for the ad hoc network capacity are presented in the paper. A revised expression to the approximate calculating of the capture probability in networks is proposed.

scholarly journals Design and Simulation of Spectrum Access and Power Management Protocol for Dynamic Access Networks

2020 ◽  
Vol 17 (4A) ◽  
pp. 588-597
Author(s):  
Ala'eddin Masadeh ◽  
Haythem Bany Salameh ◽  
Ahmad Abu-El-Haija
Keyword(s):  
Network Performance ◽  
Ad Hoc ◽  
Network Throughput ◽  
Network Simulator ◽  
Spatial Reuse ◽  
Transmission Power ◽  
Secondary Users ◽  
Primary Users ◽  
Management Protocol ◽  
Hoc Networks

This work investigates the problem of managing the transmission power and assigning channels for multi-channel single-radio Cognitive Radio Ad-Hoc Networks (CRAHNs). The considered network consists of M primary users and N secondary users, where the secondary users can use the licensed channels opportunistically when they are not utilized by the primary users. The secondary users have the capability of sensing the licensed channels and determine their occupation status. They are also able to control their transmission power such that the transmitted data can be received with high quality-of-service with the lowest possible transmission power, and minimum interference among the secondary users. This also contributes in increasing the frequency spatial reuse of the licensed channels by the secondary users, when the channels are unoccupied, which increases the network throughput. This work proposes a channel assignment algorithm aims at assigning the unoccupied licensed channels among secondary users efficiently, and a transmission power control aims at tuning the transmission power used by the secondary users to maximize the network throughput. The results show an enhancement achieved by the proposed protocol when it is integrated to the considered network, which is seen through increasing the network throughput and decreasing in the access delay. In this context, the Network Simulator 2 (NS2) was used to verify our proposed protocol, which indicates a significant enhancement in network performance

Research on Statistics Based Multi-Priority MAC Protocol for Ad Hoc Networks

2014 ◽  
Vol 644-650 ◽  
pp. 3103-3107
Author(s):  
Peng Wang ◽  
Hai Li ◽  
Ben Li Ye ◽  
Chen Chen ◽  
Yu Bao Wang
Keyword(s):  
Ad Hoc Networks ◽  
Success Rate ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Medium Access ◽  
Critical Data ◽  
Low Delay ◽  
Simulation Results ◽  
Hoc Networks ◽  
Application Diversification

With the growing application diversification in Ad Hoc networks, it is particularly important to support prioritization of traffic and ensure that critical data can be delivered more reliably and faster in an emergency scene. We mainly study on the improvement of statistics based multi-priority medium access control (MAC) protocol, including the channel occupancy statistic and the backoff mechanism. We conduct comprehensive simulations based on the OPNET Modeler and account for the success rate results with theoretical analysis. The simulation results show that the proposed algorithm can simultaneously guarantee high success rate and low delay for high-priority packets.

scholarly journals A Multichannel MAC Protocol for IoT-enabled Cognitive Radio Ad Hoc Networks

2020 ◽  
Vol 5 (1) ◽  
pp. 45-55
Author(s):  
Chien-Min Wu ◽  
Yen-Chun Kao ◽  
Kai-Fu Chang
Keyword(s):  
Cognitive Radio ◽  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Cognitive Radios ◽  
Window Size ◽  
Spatial Reuse ◽  
Wireless Spectrum ◽  
Multichannel Mac ◽  
Hoc Networks

Cognitive radios have the ability to dynamically sense and access the wireless spectrum, and this ability is a key factor in successfully building Internet-of-Things (IoT)-enabled mobile ad hoc networks. This paper proposes a contention-free token-based multichannel MAC protocol for IoT-enabled Cognitive Radio Ad Hoc Networks (CRAHNs). In this, secondary users of CRAHNs detect activity on the wireless spectrum and then access idle channels licensed by primary users. CRAHNs are divided into clusters, and the channel to use for transmission is determined dynamically from the probability of finding idle primary-user channels. The token-based MAC window size is adaptive, with adjustment according to actual traffic, which reduces both end-to-end MAC contention delay and energy consumption. High throughput and spatial reuse of channels can also be achieved using a dynamic control channel and dynamic schemes for contention windows. We performed extensive simulations to verify that the proposed method can achieve better performance in mobile CRAHNs than other MAC schemes can.

scholarly journals Capacity of Vehicular Ad Hoc Networks Based on Multibeam Directional Transmission

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Yuhua Wang ◽  
Laixian Peng ◽  
Renhui Xu
Keyword(s):  
Lower Bound ◽  
Ad Hoc Networks ◽  
Network Performance ◽  
Scaling Laws ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Network Capacity ◽  
Cross Layer ◽  
Directional Transmission ◽  
Hoc Networks

The development of multibeam directional transmission technology used in vehicular ad hoc networks is drawing much more attention in recent years due to its wider coverage ability than omnidirectional transmission. In this paper, we analyse the transport capacity of the vehicular network using different antenna modes in the transmitter and receiver end, respectively. We first construct the cross-layer model comprising the characteristic of the directional antenna model, arbitrary network model, and interference model. Then, based on scaling laws, we calculate the upper and lower bound of the network capacity with and without the directional multibeam transmission technology. In order to reduce the capacity lower bound computation complexity, several topology frameworks are constructed while taking various interferences into account included in the actual project. Finally, we analyse the capacity under changes of different parameters and also evaluate the law of capacity changes to discover how much improvement multibeam transmission technology can bring to the network performance. Analysis shows that compared with DTOR and OTDR mode, DTDR mode can continue to increase network capacity by 2 to 3 times on the basis of the above two modes.

scholarly journals A QoS Based Adaptive Backoff Scheme for Vehicular Ad Hoc Networks

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4421 ◽  
Author(s):  
Tianjiao Zhang ◽  
Qi Zhu
Keyword(s):  
Ad Hoc Networks ◽  
Network Performance ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Intelligent Transportation System ◽  
Mac Protocol ◽  
Media Access Control ◽  
Media Access ◽  
The Media ◽  
Hoc Networks

The media access control (MAC) protocol is a key element in the design of vehicular ad hoc networks (VANETs) that directly affects the network performance. The backoff schemes of existing MAC protocols apply the single backoff process and therefore are not suitable for multi-class data transmission. Additionally, they cannot satisfy the delay requirements of emergency data in the case of varying number of vehicles, causing an adverse effect to the intelligent transportation system (ITS). This paper presents a priority-based adaptive backoff scheme that can enhance the binary exponential backoff (BEB) algorithm as well as the polynomial backoff (QB) algorithm. This system distinguishes priority data with different delay requirements first and designs different backoff schemes for each type of data later. The two-dimensional Markov Chain is used to analyze the backoff scheme and determine the expressions for throughput and delay. The simulation results show that the backoff scheme provided by this paper can reduce the average data delay and regulate each kind of data delay adaptively, according to the varying number of vehicles and different delay requirements.

Sign in / Sign up

Export Citation Format

Share Document