• Journal of Information Processing Systems
• /
• 제13권6호
• /
• pp.1436-1458
• /
• 2017

Quorum-based algorithms are widely used for solving several problems in mobile ad hoc networks (MANET) and wireless sensor networks (WSN). Several quorum-based protocols are proposed for multi-hop ad hoc networks that each one has its pros and cons. Quorum-based protocol (QEC or QPS) is the first study in the asynchronous sleep scheduling protocols. At the time, most of the proposed protocols were non-adaptive ones. But nowadays, adaptive quorum-based protocols have gained increasing attention, because we need protocols which can change their quorum size adaptively with network conditions. In this paper, we first introduce the most popular quorum systems and explain quorum system properties and its performance criteria. Then, we present a comparative and comprehensive survey of the non-adaptive and adaptive quorum-based protocols which are subsequently discussed in depth. We also present the comparison of different quorum systems in terms of the expected quorum overlap size (EQOS) and active ratio. Finally, we summarize the pros and cons of current adaptive and non-adaptive quorum-based protocols.

• ETRI Journal
• /
• 제37권3호
• /
• pp.480-490
• /
• 2015

The reliability of sensor networks is generally dependent on the battery power of the sensor nodes that it employs; hence it is crucial for the sensor nodes to efficiently use their battery resources. This research paper presents a method to increase the reliability of sensor nodes by constructing a connected dominating tree (CDT), which is a subnetwork of wireless sensor networks. It detects the minimum number of dominatees, dominators, forwarder sensor nodes, and aggregates, as well as transmitting data to the sink. A new medium access control (MAC) protocol, called Homogenous Quorum-Based Medium Access Control (HQMAC), is also introduced, which is an adaptive, homogenous, asynchronous quorum-based MAC protocol. In this protocol, certain sensor nodes belonging to a network will be allowed to tune their wake-up and sleep intervals, based on their own traffic load. A new quorum system, named BiQuorum, is used by HQMAC to provide a low duty cycle, low network sensibility, and a high number of rendezvous points when compared with other quorum systems such as grid and dygrid. Both the theoretical results and the simulation results proved that the proposed HQMAC (when applied to a CDT) facilitates low transmission latency, high delivery ratio, and low energy consumption, thus extending the lifetime of the network it serves.

• 디지털콘텐츠학회 논문지
• /
• 제18권4호
• /
• pp.753-760
• /
• 2017

본 논문에서는 무선센서 네트워크 환경에서 스케줄링 기법 중 큐롬(Quorum)기반 이웃 노드 탐색 프로토콜을 개선한 결합 큐롬기반 스케줄링 기법을 제안한다. 본 논문에서 제시하는 방법은 서로 다른 크기를 갖는 두 개의 큐롭기반 스케줄링을 결합하여 새로운 스케줄을 생성하는 방법이다. 기존의 그리드기반의 큐롬 스케줄링 방법은 주어진 스케줄의 주기 내에서 2번의 만남을 보장하는 방법이지만 두 개의 그리드를 결합하여 생성된 스케줄방법은 두 개의 스케줄이 만나는 횟수가 증가한다. 제안하는 방법과 토심(TOSSIM) 시뮬레이터를 사용하여 그리드기반의 스케줄링 방법인 큐롬, 써치라이트 및 헤디스와 성능을 비교하였다. 실험에서 모든 센서 노드가 서로 다른 듀티 싸이클을 가정하여 실험을 수행하였다. 실제 실험결과 제안하는 방법이 기존의 다른 이웃 노드탐색 프로토콜에 비해 우수한 성능을 보였다.