• Title/Summary/Keyword: medium access control

Search Result 417, Processing Time 0.081 seconds

The medium access control protocol of virtual token bus network for real time communication (실시간 통신을 위한 가상토큰버스 통신망의 매체접근제어 프로토콜)

  • 정연괘
    • Journal of the Korean Institute of Telematics and Electronics A
    • /
    • v.33A no.7
    • /
    • pp.76-91
    • /
    • 1996
  • In this paper, we proposed the new medium access control protocol for the virtual token bus netowrk. The network is applied to inter-processor communication network of large capacity digital switching system and digital mobile system with distributed control architecture. in the virtual token bus netowrk, the existing medium access control protocols hav ea switchove rtime overhead when traffic load is light or asymmetric according ot arbitration address of node that has message to send. The proposed protocol optimized average message delay using cyclic bus access chain to exclude switchover time of node that do not have message to send. Therefore it enhanced bus tuilization and average message delay that degrades the performance of real time communication netowrks. It showed that the proposed protocol is more enhacned than virtual token medium access control protocol and virtual token medium access control protocol iwth reservation through performance analysis.

  • PDF

Performance Evaluation of an Underwater Propagation Delay-Aware Medium Access Control Protocol (수중 전파 지연을 고려한 매체 접근 제어 프로토콜에 대한 성능 평가)

  • Hwang, Ho Young;Kim, Woo-Sik;Lee, Sang-Kug;Cho, Ho-Shin
    • The Journal of the Acoustical Society of Korea
    • /
    • v.34 no.6
    • /
    • pp.463-469
    • /
    • 2015
  • In this paper, we propose an underwater propagation delay-aware medium access control protocol and evaluate the performance of the proposed protocol. In the proposed propagation delay-aware medium access control protocol, a sink node can restore the received RTS frames that are not piled up in a slot time. We analyze and compare the performance of the proposed underwater propagation delay-aware medium access control protocol with that of the conventional medium access control protocol in various environments.

LTE에서의 Medium Access Control 표준기술

  • Song, Pyeong-Jung;Tri, Do Huu;Im, Seon-Bae
    • Information and Communications Magazine
    • /
    • v.25 no.9
    • /
    • pp.32-40
    • /
    • 2008
  • 본고에서는 현재 3GPP (3rd Generation Partner Project)에서 표준화 작업이 마무리중인 LTE (Long Term Evolution) 시스템에서 Medium Access Control의 구조, 절차 및 PDU 포멧 등에 대해 알아본다.

Delay and Channel Utilization Analysis of IEEE 802.12 VG-AnyLAN Medium Access Control under the Homogeneous Traffic Condition (동질 트래픽 조건에서 IEEE 802.12 VG-AnyLAN 매체접근제어의 지연시간과 채널이용율 해석)

  • Joo, Gi-Ho
    • The KIPS Transactions:PartC
    • /
    • v.13C no.5 s.108
    • /
    • pp.567-574
    • /
    • 2006
  • VG-AnyLAN is a local area network standard developed by the IEEE 802.12 project. While preserving the frame format of IEEE 802.3, VG-AnyLAN adopts a new medium access control called Demand Priority where transmission requests of stations are arbitrated by a control hub in a round-robin manner. Unlike CSMA/CD which is the medium access control of IEEE 802.3, the Demand Priority, while providing the maximum bound on the packet delay, does not put the limit on the network segment size. In this paper, we analyze the delay and the channel utilization performances of the medium access control of IEEE 802.12 VG-AnyLAN. We develope an analytic model of the system under assumptions that each station generates traffic of the equal priority and that the packets are of fixed length. Using the analytic model, we obtain the recursive expression of the average channel utilization and the average access delay The numerical results obtained via analysis are compared to the simulation results of the system for a partial validation of our analysis.

MIMO Ad Hoc Networks: Medium Access Control, Saturation Throughput, and Optimal Hop Distance

  • Hu, Ming;Zhang, Junshan
    • Journal of Communications and Networks
    • /
    • v.6 no.4
    • /
    • pp.317-330
    • /
    • 2004
  • In this paper, we explore the utility of recently discovered multiple-antenna techniques (namely MIMO techniques) for medium access control (MAC) design and routing in mobile ad hoc networks. Specifically, we focus on ad hoc networks where the spatial diversity technique is used to combat fading and achieve robustness in the presence of user mobility. We first examine the impact of spatial diversity on the MAC design, and devise a MIMO MAC protocol accordingly. We then develop analytical methods to characterize the corresponding saturation throughput for MIMO multi-hop networks. Building on the throughout analysis, we study the impact of MIMO MAC on routing. We characterize the optimal hop distance that minimizes the end-to-end delay in a large network. For completeness, we also study MAC design using directional antennas for the case where the channel has a strong line of sight (LOS) component. Our results show that the spatial diversity technique and the directional antenna technique can enhance the performance of mobile ad hoc networks significantly.

An Iterative Analysis of Single-Hop B-MAC Networks Under Poisson Traffic

  • Jung, Sung-Hwan;Choi, Nak-Jung;Kwon, Tae-Kyoung
    • Journal of Communications and Networks
    • /
    • v.14 no.1
    • /
    • pp.40-50
    • /
    • 2012
  • The Berkeley-medium access control (B-MAC) is a lightweight, configurable and asynchronous duty cycle medium access control (MAC) protocol in wireless sensor networks. This article presents an analytic modelling of single-hop B-MAC protocol under a Poisson traffic assumption.Our model considers important B-MAC parameters such as the sleep cycle, the two stage backoff mechanism, and the extended preamble. The service delay of an arriving packet and the energy consumption are calculated by an iterative method. The simulation results verify that the proposed analytic model can accurately estimate the performance of single-hop B-MAC with different operating environments.

A Distributed Medium Access Control Protocol for Cognitive Radio Ad Hoc Networks

  • Joshi, Gyanendra Prasad;Kim, Sung Won;Kim, Changsu;Nam, Seung Yeob
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.9 no.1
    • /
    • pp.331-343
    • /
    • 2015
  • We propose a distributed medium access control protocol for cognitive radio networks to opportunistically utilize multiple channels. Under the proposed protocol, cognitive radio nodes forecast and rank channel availability observing primary users' activities on the channels for a period of time by time series analyzing using smoothing models for seasonal data by Winters' method. The proposed approach protects primary users, mitigates channel access delay, and increases network performance. We analyze the optimal time to sense channels to avoid conflict with the primary users. We simulate and compare the proposed protocol with the existing protocol. The results show that the proposed approach utilizes channels more efficiently.

Performance Analysis of an Collision Resolution Algorithm in HFC-CATV Network (HFC-CATV 망에서의 충돌해결알고리즘에 대한 성능분석)

  • 이수연;안정희
    • The Journal of the Korea Contents Association
    • /
    • v.2 no.3
    • /
    • pp.113-118
    • /
    • 2002
  • To provide interactive sonics in HFC(Hybrid Fiber Coax)-CATV network, there must be supported a MAC(Medium Access Control) protocol. It is wet known that collision can be occurred in the HFC upstream channel because it is shared by up to 500 users. Thus it needs the collision resolution algorithm. Consequently, this paper proposes the analysis mood to study stability of binary stack algorithm for adaptive collision resolution algorithm in HFC-CATV. Also, it compares a system throughput between IPP model and D-BMAP model.

  • PDF

A Medium Access Control Protocol for Stable Internet Services on IS-2000 Network (IS-2000망에서 안정적 인터넷 서비스를 위한 매체접근제어 프로토콜)

  • 조성현;박성한
    • Proceedings of the IEEK Conference
    • /
    • 2000.11a
    • /
    • pp.193-196
    • /
    • 2000
  • A new medium access control protocol is proposed to support stable wireless Internet services. Using the characteristics of the uplink Internet traffic and a Voice-Packet multi-session mode, the proposed protocol transmits the uplink Internet traffic via the voice traffic channel of silent duration in a multi-session mode. Out simulation results show that the proposed protocol guarantees stable wireless Internet services under heavy loads.

  • PDF

Light Medium Access Control (MAC) Protocol for Wireless Universal Serial Bus (WUSB)

  • Kim, Jun-Whan;Huh, Jea-Doo
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • 2005.11a
    • /
    • pp.199-201
    • /
    • 2005
  • USB has arguably become the most successful PC peripheral interconnect ever defined. As appearing UWB, wireless USB (WUSB) emerges very popular technology. However, the distributed Medium Access Control (MAC) does not harmonize with the topology of WUSB. In this paper, we address a novel MAC protocol for conformity with WUSB. The protocol is to handle negotiation on Distributed Reservation Protocol (DRP) including the channel time slot of WUSB.

  • PDF