• 인터넷정보학회논문지
• /
• 제18권6호
• /
• pp.65-73
• /
• 2017

Congestion occurring at wireless sensor networks(WSNs) causes packet delay and packet drop, which directly affects overall QoS(Quality of Service) parameters of network. Network congestion is critical when important data is to be transmitted through network. Thus, it is significantly important to effectively control the congestion. In this paper, new mechanism to guarantee reliable transmission for the important data is proposed by considering the importance of packet, configuring packet priority and utilizing the settings in routing process. Using this mechanism, network condition can be maintained without congestion in a way of making packet routed through various routes. Additionally, congestion control using packet service time, packet inter-arrival time and buffer utilization enables to reduce packet delay and prevent packet drop. Performance for the proposed mechanism was evaluated by simulation. The simulation results indicate that the proposed mechanism results to reduction of packet delay and produces positive influence in terms of packet loss rate and network lifetime. It implies that the proposed mechanism contributes to maintaining the network condition to be efficient.

• 한국전자통신학회논문지
• /
• 제10권2호
• /
• pp.289-296
• /
• 2015

대용량 멀티미디어 데이터를 센싱 및 전송하기 위한 무선 멀티미디어 센서 네트워크는 지연에 민감한 특징을 가진다. 본 논문은 멀티미디어 데이터를 전송하기위한 효율적인 네트워크 환경을 위해 트래픽에 따른 우선순위 라우팅 방법을 통한 지연을 최소화 시키는 메커니즘을 제안한다. 또한 노드에 도착하는 패킷들의 도착, 처리 되는 시간차와 버퍼 점유율을 고려하여 혼잡 제어 메커니즘을 제안한다. 시뮬레이션을 통해 성능 분석을 수행하여 제안한 라우팅 방법으로 인해 패킷 지연이 감소되는 것을 확인 하였고, 네트워크에 많은 양의 데이터가 유입되었을 때 혼잡을 감지하고 제어하여 안정적인 네트워크 상태를 유지하는 것을 검증하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제4권4호
• /
• pp.529-546
• /
• 2010

Greedy forwarding is the key mechanism of geographic routing and is one of the protocols used most commonly in wireless sensor networks. Greedy forwarding uses 1-hop local information to forward packets to the destination and does not have to maintain the routing table, and thus it takes small overhead and has excellent scalability. However, the signal intensity reduces exponentially with the distance in realistic wireless sensor network, and greedy forwarding consumes a lot of energy, since it forwards the packets to the neighbor node closest to the destination. Previous proposed greedy forwarding protocols are the sender-based greedy forwarding that a sender selects a neighbor node to forward packets as the forwarding node and hence they cannot guarantee energy efficient forwarding in unpredictable wireless environment. In this paper, we propose the receiver-based greedy forwarding called RGF where one of the neighbor nodes that received the packet forwards it by itself. In RGF, sender selects several energy efficient nodes as candidate forwarding nodes and decides forwarding priority of them in order to prevent unnecessary transmissions. The simulation results show that RGF improves delivery rate up to maximum 66.8% and energy efficiency, 60.9% compared with existing sender-based greedy forwarding.