• Title/Summary/Keyword: distributed reservation protocol

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A Conflict-Avoided Resource Reservation using Reservation Diversity for UWB WPAN with Distributed MAC Protocol

  • Joo, Yang-Ick;Hur, Kyeong
    • Journal of information and communication convergence engineering
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    • v.9 no.4
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    • pp.405-410
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    • 2011
  • In this paper, a conflict-avoided resource reservation scheme for UWB (Ultra Wide Band) WPAN (Wireless Personal Area Network) with D-MAC (Distributed Medium Access Control) is proposed. Since distributed characteristic of the WiMedia D-MAC supporting DRP (Distributed Reservation Protocol) scheme may cause lots of conflicts, overall performances of the WiMedia D-MAC can be deteriorated. In addition, once a DRP conflict occurs, only one of the DRP reservations involved in that DRP conflict maintains the reserved MASs, while the other DRP reservation must be terminated and DRP negotiations for them have to be re-started. Such DRP termination and renegotiation time delays due to the DRP conflicts can be a critical problem to the mobile devices transceiving real-time QoS traffic streams. Therefore, we propose a mechanism to avoid DRP conflicts by providing a kind of path diversity using relay transmission scheme and demonstrate its performance improvements via simulation results.

Reservation Conflict-Free MAC Design for Mobile Wireless USB Devices with Distributed MAC

  • Joo, Yang-Ick;Kwon, Moon Kyu
    • Journal of Korea Multimedia Society
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    • v.15 no.10
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    • pp.1212-1220
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    • 2012
  • In this paper, a collision-free resource reservation scheme for WUSB (Wireless Universal Serial Bus) networks with WiMedia D-MAC (Distributed Medium Access Control). Since distributed characteristic of the WiMedia D-MAC supporting DRP (Distributed Reservation Protocol) scheme may cause lots of conflicts, overall performances of the WUSB with WiMedia D-MAC can be deteriorated. In addition, when we consider multi-hop environment, "mobile" hidden node problem due to mobility of WUSB devices can be happened, and it is a critical problem to mobile WUSB devices transceiving real-time QoS (Quality of Service) traffic. To tackle the problem, we propose a new DRP reservation mechanism to prevent DRP conflicts for multi-hop mobility support in WUSB networks with WiMedia D-MAC and show its improved performance via simulation results.

A Cross-layer Link Adaptive HD Video Transmission Scheme in WiMedia D-MAC based UWB Systems

  • Joo, Yang-Ick
    • Journal of Korea Multimedia Society
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    • v.15 no.12
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    • pp.1464-1474
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    • 2012
  • In this paper, we propose a QoS (Quality of Service)-aware and cooperative resource reservation scheme using cross-layer link adaptation for wireless high definition video transmission through UWB (Ultra Wide Band) network with D-MAC (Distributed Medium Access Control). A wireless high definition video transmission system usually requires stable high throughput even without line-of-sight, e.g., a destination device in another room separated by a wall. Since the WiMedia D-MAC supporting DRP (Distributed Reservation Protocol) scheme causes lots of DRP resource reservation conflicts due to failure of beacon detection in wireless channel environment, overall performances of the WiMedia D-MAC can be deteriorated. And the current WiMedia MAC standard has not considered QoS provisioning even though QoS parameters such as a range of service rates are provided to each traffic stream. Therefore, we propose Relay DRP protocol with QoS-based relay node selection criterion, which makes a relay path to avoid DRP resource reservation conflicts and guarantee QoS more stably through cross-layer link adaptation of cooperative relay transmission scheme and is compliant with the current WiMedia D-MAC protocol. Simulation results demonstrate performance improvements of the proposed method for throughput and QoS provisioning.

Relay Transmission Protocol for QoS Enhancement in WiMedia Distributed MAC/WUSB Systems (WiMedia Distributed MAC 통신 시스템에서 QoS 성능 향상을 위한 릴레이 통신 프로토콜)

  • Hur, Kyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.4
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    • pp.692-700
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    • 2012
  • The WiMedia Alliance has specified a Distributed Medium Access Control (D-MAC) protocol based on UWB for high speed wireless home networks and Wireless USB. In this paper, firstly, the fair SoQ-based Distributed Reservation Protocol (DRP) for D-MAC is analyzed. And a novel SoQ-based relay transmission protocol is proposed to overcome DRP conflicts fast. In the proposed protocol, each device executes the Satisfaction of QoS (SoQ) time slot allocation algorithm independently. And, in order to give the loser device due to DRP conflicts another chance to maintain QoS resources, the proposed relay transmission protocol helps the device reserve another indirect link maintaining the required QoS resources via a relay node.

A Lightpath Establishment Algorithm in WDM/TDM Networks (WDM/TDM 네트워크에서 광 경로 설정 알고리즘)

  • 임재복;김진영;이현태
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.7
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    • pp.1427-1433
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    • 2003
  • This paper presents the routing and wavelength and timeslot assignment problems for a circuit-switched time division multiplexed (TDM) wavelength-routed networks. In this paper, we propose an efficient distributed control protocol for establishing lightpath dynamically. The protocol uses backward reservation to reduce the chance of blocking. We use aggressive reservation method with usable multiple channels and select only one in multiple channel. We show through simulation that the proposed protocol improves the success rate in TDM-based lightpath establishment and the proposed aggressive reservation method improve blocking probability with appropriate reservation channel count.

Channel Reservation based DCF MAC Protocol for Improving Performance in IEEE 802.11 WLANs (IEEE 802.11 무선 랜에서 성능 향상을 위한 채널 예약 기반 DCF MAC 프로토콜)

  • Hyun, Jong-Uk;Kim, Sunmyeng
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2159-2166
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    • 2016
  • In the IEEE 802.11 DCF (Distributed Coordination Function) protocol, the binary exponential backoff algorithm is used to avoid data collisions. However, as the number of stations increases of, the collision probability tends to grow and the overall network performance is reduced. To solve this problem, this paper proposes a data transmission scheme based on the channel reservation method. In the proposed scheme, channel time is divided into reservation period and contention period. During the reservation period, stations succeeded in channel reservation transmit their own data packets in sequence without contention. During the contention period, each station sends its data packets through contentions as in DCF. During both the reservation period and the contention period, each station sends a request for channel reservation for the next reservation period to an AP (Access Point). After receiving such a channel reservation request from each station, the AP decides whether the reservation is succeeded and sends the result via a beacon frame to each station. Performance of the proposed scheme is analyzed through simulations. The simulation results show that the proposed scheme tends to reduce the collision probability of DCF and to improve the overall network performance.

Relay Transmission Protocol for Mobility Support in WiMedia Distributed MAC Systems (WiMedia Distributed MAC 통신 시스템에서 이동성 지원을 위한 릴레이 통신 프로토콜)

  • Hur, Kyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.3
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    • pp.526-534
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    • 2014
  • In this paper, for the WiMedia Distributed Medium Access Control (D-MAC) protocol based on UWB. performance degradation due to the Distributed Reservation Protocol (DRP) conflict problem caused by devices' mobility is analyzed. And a DRP relay protocol and a DRP conflict resolution (CR) are proposed to overcome the performance degradation at DRP conflicts. In order to give the loser device at DRP conflicts a chance to maintain resources, the proposed DRP relay protocol executed at each device helps the loser device reserve an indirect link maintaining the required resources via a relay node. Simulation results considering the mobile environment have indicated that the DRP relay combined with the CR prevent the throughput decrease even though mobility of devices increases.

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
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    • 2005.11a
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    • pp.199-201
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    • 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.

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A Distributed Lightpath Establishment Algorithm in WDM/TDM Networks (WDM/TDM 네트워크에서 분산 광경로 설정 알고리즘)

  • 임재복;김진영;이현태
    • Proceedings of the Korea Contents Association Conference
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    • 2003.05a
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    • pp.466-469
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    • 2003
  • This paper presents the routing and wavelength and timeslot assignment problems for a circuit-switched time division multiplexed (TDM) wavelength-routed networks. In this paper, we propose an efficient distributed control protocol for establishing lightpath dynamically. The protocol uses backward reservation to reduce the chance of blocking. we use aggressive reservation method with usable multiple channels and select only one in multiple channel. We show through simulation that the proposed protocol improves the success rate in TDM -based lightpath establishment.

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A Method for the Performance Ehancement of PRMA Protocol for Mobile Voice/Data Integration (음성/데이터 통합형 PRMA 프로토콜의 성능 개선 기법)

  • 송재섭;김연수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.3B
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    • pp.423-430
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    • 2000
  • Future microcellular systems will require distributed network control. A packet-switched network is suitable for this requirement. The packet reservation multiple access(PRMA) is a Reservation-ALOHA like protocol for wireless terminals to transmit packet speech to a base station. It allows spatially distributed users in cellular systems to transmit packeted voice and data to a common base station using a shared channel. In the existing PRMA, the problem is that the voice packets may collide with the data packets due to simultaneous channel access. the problem may be a major performance degradation factor to a voice and data mixed system. We propose a new PRMA method that integrates voice and data traffic efficiently by resolving the collision problem between data and voice packets. The proposed PRMA method gives a performance improvement than the existing PRAMA method in terms of voice packet dropping probability and data delay characteristic. From analytic results, we can confirm that the proposed PRMA method show a performance improvement than the existing PRMA protocol.

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