무선메쉬네트워크 환경을 고려한 MAC protocol제안 (MDCF)

이 자료는 Rui Zhao가 IEEE에 제안한 내용으로 무선메쉬네트워크 환경에서 효과적으로 작동하는 MAC protocol을 제안한 내용으로 QoS까지 지원할 수 있도록 굉장히 방대한 내용을 수록하고 있다.

무선메쉬네트워크의 기술적인 부분이나, 이론적인 부분들에 대해서 어느정도 이해가 있다면 이 논문을 통해서 실제로 어떻게 무선메쉬네트워크 환경에 맞는 프로토콜을 제안할 수 있는지를 확인할 수 있는 자료로 활용되면 매우 좋을 것 같다.

요약

Wireless Mesh Networks (WMN) are receiving growing attention. They can widely find applications in Wireless Local Area Networks (WLAN), Wireless Metropolitan Area Networks (WMAN), Wireless Personal Area Networks (WPAN) and Wireless Sensor Networks (WSN), helping to substantially improve the network performance, cut down the operation cost and bring more convenience to both operators and end users. There are lots of open research issues in the field. Among them, the design of the Media Access
Control (MAC) protocol is the most challenging one.

This thesis proposes Mesh Distributed Coordination Function (MDCF), a novel MAC protocol that can be used to construct efficient WMNs supporting Quality of Service (QoS). MDCF applies Time Division Multiple Access (TDMA) to share the radio medium in a fully distributed manner. It is able to run on a single frequency channel independent of physical schemes. Transmissions in MDCF networks take place in periodic time slots in a dynamic Time Division Duplex (TDD) mode of operation. A novel synchronization algorithm, operating under fully distributed control, is proposed for synchronizing mesh points (MP) for TDMA operation in the multi-hop environment. MDCF is well designed to properly handle highly loaded situations, hidden stations, exposed stations and capture effect which usually appear in a mesh environment and may dramatically deteriorate the network performance. For QoS support, besides a prioritized, collision eliminating and fair channel access mechanism, a distributed Radio Resource Control (RRC) protocol is used to evaluate and allocate a fair portion of bandwidth to a specific traffic flow. The assigned portion of the bandwidth for a flow is adaptable with the traffic load and overall channel utilization. As a result, MDCF is able to efficiently exploit channel capacity, fairly distribute bandwidth and support multi-hop relaying of a large number of concurrent various traffic services in a WMN.

The performance of MDCF is extensively evaluated by both analytical and simulation approaches. The results exhibit the outstanding performance of MDCF, significantly outperforming the IEEE 802.11 Distributed Coordination Function (DCF) and Enhanced Distributed Coordinated Access (EDCA), in both single-hop and mesh environments.

MDCF has been submitted as a MAC proposal for the IEEE 802.11 Task Group s (TGs), which is formed to develop mesh WLANs. It can also be tailored for WMAN, WPAN and WSN mesh applications.

Mesh Distributed Coordination Function for Efficient Wirele.pdf