Contention-based protocols with Reservation Mechanisms

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Presentation transcript:

Contention-based protocols with Reservation Mechanisms Collision avoidance time allocation protocol (CATA) based on dynamic topology-dependent transmission scheduling Nodes contend for and reserve time slots by means of a distributed reservation and handshake mechanism. Support broadcast, unicast, and multicast transmissions. The operation is based on two basic principles: The receiver(s) of a flow must inform the potential source nodes about the reserved slot on which it is currently receiving packets. The source node must inform the potential destination node(s) about interferences in the slot. Usage of negative acknowledgements for reservation requests, and control packet transmissions at the beginning of each slot, for distributing slot reservation information to senders of broadcast or multicast sessions.

Contention-based protocols with Reservation Mechanisms Hop reservation multiple access protocol (HRMA) a multichannel MAC protocol which is based on half-duplex, very slow frequency-hopping spread spectrum (FHSS) radios uses a reservation and handshake mechanism to enable a pair of communicating nodes to reserve a frequency hop, thereby guaranteeing collision-free data transmission. can be viewed as a time slot reservation protocol where each time slot is assigned a separate frequency channel. Soft reservation multiple access with priority assignment (SRMA/PA) Developed with the main objective of supporting integrated services of real-time and non-real-time application in ad hoc networks, at the same time maximizing the statistical multiplexing gain. Nodes use a collision-avoidance handshake mechanism and a soft reservation mechanism.

Contention-based protocols with Reservation Mechanisms Five-Phase Reservation Protocol (FPRP) a single-channel time division multiple access (TDMA)-based broadcast scheduling protocol. Nodes uses a contention mechanism in order to acquire time slots. The protocol assumes the availability of global time at all nodes. The reservation takes five phases: reservation, collision report, reservation confirmation, reservation acknowledgement, and packing and elimination phase. MACA with Piggy-Backed Reservation (MACA/PR) Provide real-time traffic support in multi-hop wireless networks Based on the MACAW protocol with non-persistent CSMA The main components of MACA/PR are: A MAC protocol A reservation protocol A QoS routing protocol

Contention-based protocols with Reservation Mechanisms Real-Time Medium Access Control Protocol (RTMAC) Provides a bandwidth reservation mechanism for supporting real-time traffic in ad hoc wireless networks RTMAC has two components A MAC layer protocol is a real-time extension of the IEEE 802.11 DCF. A medium-access protocol for best-effort traffic A reservation protocol for real-time traffic A QoS routing protocol is responsible for end-to-end reservation and release of bandwidth resources.