WDM 메트로 링에서 공정한 전송을 위한 확률기반 MAC 프로토콜에 대한 성능 평가

소원호,김영천,So Won-Ho,Kim Young-Chon 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.4B

본 논문에서는 FT-TR(Fixed Transmitter-Tunable Receiver) 형 액세스 노드를 사용하여 광대역 액세스 망을 연결하는 파장 분할 다중화 (Wavelength Division Multiplexing; WDM)기반의 메트로(metro) 링에서 공정한 전송을 위한 MAC 프로토콜을 제안한다. 기본적인 채널 액세스 방식은 CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance)이며 메트로 링을 순환한 전송된 슬롯은 SS(Source-Stripping) 방식으로 패킷이 제거되어 빈 슬롯이 된다. 빈 슬롯은 바로 패킷 전송에 이용되거나 다음 액세스 노드에 그대로 전송될 수 있는데, 전자는 망의 처리율은 향상되나 공정성에 문제가 발생되며 후자는 공정성은 향상되나 처리율이 낮은 단점을 갖는다. 따라서 제안된 MAC 프로토콜은 전자와 후자의 장점을 이용한다 제안된 프로토콜은 p-Persistent MAC 프로토콜로서 파장 채널을 공유하는 액세스 노드는 하향 액세스 노드에게도 빈 슬롯을 이용하도록 확률적으로 전송 기회를 주고, 상향 액세스 노드의 무조건적인 빈 슬롯 사용을 확률적으로 억제하는 방식이다. 수치적 분석을 통하여 제안된 프로토콜에 대한 대역 효율성과 최대 노드 처리율을 분석하고 시뮬레이션을 통하여 확률에 따른 노드 처리율, 전송 공정성, 전송 지연 등의 다양한 결과를 분석한다. 또한 FT-TR 형 액세스 노드인 FT-FRn (Fixed Transmitter-nFixed Receivers)과 FT-TR 구조로 메트로 망을 구성하여 제안된 MAC 프로토콜을 비교 평가한다. In this paper, we consider a WDM based metro ring connecting broadband access networks by using FT-TR (Fixed Transmitter-Tunable Receiver) type access nodes and a new MAC protocol for fair transmission is proposed. The basic channel access scheme is CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance) and the transferred optical slot is changed to be empty slot by SS(Source-Stripping) which drops a packet from ring-rotated slot. This empty slot can be either used to send head-of-line packet in buffer or transmitted to next access node. In former cases, there is the improvement of network throughput, but latter case leads unfairness problem of transmission. Thus the proposed MAC protocol exploits the advantages form tow cases. It gives downstream access nodes chance to use empty slots and limits the unconditional usage of empty slots at upstream access nodes with probability as called p-Persistent MAC protocol. We use a numerical analysis to evaluate bandwidth efficiency and maximum node throughput and compares simulation results in terms of node throughput, fairness factor, transfer delay depending on probability. Under two different FT-TR type architectures for metro ring network the proposed MAC protocol is evaluated and compared.

IEEE 802.11e에서 동일 서비스 클래스 간의 공정성 향상을 위한 IFMA MAC 프로토콜

탐라카 니푼,신석주 한국차세대컴퓨팅학회 2012 한국차세대컴퓨팅학회 논문지 Vol.8 No.5

본 논문에서는 비인프라 기반의 무선 네트워크에서 동일 서비스 클래스 간의 공정성을 향상시킬 수 있는 새로운 MAC (Medium Access Control) 프로토콜인 IFMA (Intra-class Fair Medium Access) 기법을 제안하였다. 제안된 기법은 IEEE 802.11e 표준에서 MAC 계층의 경쟁 파라미터 중 하나인 임의 프레임 간격 번호 (AIFSN)를, 각각의 사용자에 대해 쉽게 계산될 수 있는 패킷 손실률을 기반으로 제어하는 방식이다. NS-2를 이용한 모의실험을 통하여, 제안 기법이 동일한 QoS 클래스에 속해 있는 다수의 단말들이 채널 접속에 대해 공정한 기회를 제공받을 수 있음을 확인하였다.

A Fair Distributed Resource Allocation Method in UWB Wireless PANs with WiMedia MAC

Kim, Seok-Hwan,Hur, Kyeong,Park, Jong-Sun,Eom, Doo-Seop,Hwang, Kwang-Il The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.4

The WiMedia alliance has specified a distributed medium access control (WiMedia MAC) protocol based on ultra wideband (UWB) for high data rate WPANs (HR-WPANs). The merits of WiMedia MAC such as distributed nature and high data rate make it a favorite candidate in HR-WPAN. Although QoS parameters such as the range of service rates are provided to a traffic stream, the WiMedia MAC is not able to use the QoS parameters and to determine or adjust a service rate using the QoS parameters for the traffic stream. In this paper, we propose a fair and adaptive resource allocation method that allocates time slots to isochronous streams according to QoS parameters and the current traffic load condition in a fully distributed manner. Although the traffic load condition changes, each device independently recognizes the changes and calculates fair and maximum allowable service rates for traffic streams. From the numerical and simulation results, it is proved that the proposed method achieves high capacity of traffic streams and fair QoS provisioning under various traffic load condition.

A Fair Distributed Resource Allocation Method in UWB Wireless PANs withWiMedia MAC

Seokhwan Kim,Kyeong Hur,박종선,엄두섭,황광일 한국통신학회 2009 Journal of communications and networks Vol.11 No.4

The WiMedia alliance has specified a distributed medium access control (WiMedia MAC) protocol based on ultra wideband (UWB) for high data rate WPANs (HR-WPANs). The merits of WiMedia MAC such as distributed nature and high data rate make it a favorite candidate in HR-WPAN. Although QoS parameters such as the range of service rates are provided to a traffic stream, the WiMedia MAC is not able to use the QoS parameters and to determine or adjust a service rate using the QoS parameters for the traffic stream. In this paper, we propose a fair and adaptive resource allocation method that allocates time slots to isochronous streams according to QoS parameters and the current traffic load condition in a fully distributed manner. Although the traffic load condition changes, each device independently recognizes the changes and calculates fair and maximum allowable service rates for traffic streams. From the numerical and simulation results, it is proved that the proposed method achieves high capacity of traffic streams and fair QoS provisioning under various traffic load condition.

Fairness CSMA/CA MAC Protocol for VLC Networks

Huynh, Vu Van,Jang, Yeong-Min The Institute of Internet 2012 Journal of Advanced Smart Convergence Vol.1 No.1

This paper presents a fair MAC protocol based on the CSMA/CA algorithm in visible light communication (VLC) networks. The problem of bandwidth sharing among differentiated priority in VLC networks can be solved by using number of backoff time and backoff exponent parameters with AIFS. The proposed algorithm can achieve fair allocation of the bandwidth resource among differentiated priority. The two dimension Markov chain is assisted for analyzing the proposed mechanism about throughput and delay metrics. Numerical results show that our proposed algorithm improves the fairness among different traffic flows.

Fairness CSMA/CA MAC Protocol for VLC Networks

Vu Van Huynh,Yeong Min Jang 한국인터넷방송통신학회 2012 Journal of Advanced Smart Convergence Vol.1 No.1

수중 센서 네트워크에서 공평성 문제를 해결하기 위한 가중치 기반 MAC 프로토콜

최성영(Sungyoung Choi),김선명(Sunmyeng Kim) 한국정보기술학회 2017 Proceedings of KIIT Conference Vol.2017 No.6

Additional Transmission Protocol for Fairness Enhancement in IEEE 802.11 Wireless LANs

Tae-Uk Kang(강태욱),Sunmyeng Kim(김선명) 대한전기학회 2016 전기학회논문지 Vol.65 No.12

In IEEE 802.11 wireless LANs, when a source node with low data rate occupies the channel resource for a long time, network performance degrades. In order to improve performance, the cooperative communication has been proposed. In the previous cooperative communication protocols, relay nodes deliver data packets only for a source node. In this paper, we propose an additional transmission scheme in which relay nodes select an additional source node based on several information and deliver data packets for the original source node and the selected additional source node. The proposed scheme improves performance and provides fairness among source nodes. Performance of the proposed scheme is investigated by simulation. Our results show that the proposed scheme outperforms the previous protocol in terms of fairness index and throughput.

수중 센서 네트워크에서 공평성 향상 방법

강우진(WooJin Kang),김선명(Sunmyeng Kim) 한국정보기술학회 2017 Proceedings of KIIT Conference Vol.2017 No.6

Ad-hoc 망에서 채널의 부분정보를 이용한 스케줄링 기법

신수영,장영민 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.b11

본 논문에서는 Ad-hoc 망인 블루투스 시스템의 각 채널의 질 정보를 이용하여 대역폭을 효율적으로 사용하는 새로운 스케줄링 기법을 제시하였다. 특히 제시한 기법은 채널의 불균형한 환경과 여러 가지 특성의 데이터가 혼합되어 전송되는 경우, 특정한 채널에 데이터가 집중되는 경우에 효과적인 것으로 나타났다. 각 채널의 부분 정보를 이용하여 가중치를 계산하고 그 값을 GPS 알고리즘을 수정한 새로운 스케줄링 기법에 적용하였으며 NS-2와 블루학 시뮬레이션을 통해 제시한 기법의 효율성을 검증하였다. A new scheduling scheme, which uses channel quality information of each flow in Bluetooth system of ad-hoc network for effective bandwidth assignment, has been proposed in this paper. By an effective bandwidth assignment, QoS (Quality of Service) could have been ensured in case of asymmetric data traffic, mixed data transmission, and congested data transmission in a specific channel. The scheduling algorithm determines channel weights using partial channel information of flows. Case studies conducted by NS-2 (Network Simulator 2) and Bluehoc simulator has been presented to show the effectiveness of the proposed scheduling scheme.