An analysis of incident information transmission performance using MCS/CDMA scheme

Watanabe, Fumio; Fujii, Masahiro; Itami, Makoto; Itoh, Kohji

doi:10.1109/ivs.2005.1505110

Cited by 15 publications

(11 citation statements)

References 3 publications

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“…Consider that a node x has a MAC layer service data unit (MSDU) 6 to be delivered to a certain destination (assuming unicast) on service channel c m . In what follows, the term 'service' refers to the delivery of an MSDU on a certain service channel.…”

Section: Accessing Slots On the Service Channelsmentioning

confidence: 99%

“…, M 7 . If node x decides 6. An MSDU is a unit of data arriving to the MAC layer entity from the layer above.…”

Section: Accessing Slots On the Service Channelsmentioning

confidence: 99%

“…An SDMA scheme consists of three main parts: a discretization procedure which divides the road into small areas called cells, a mapping function which assigns to each of the cells a unique time slot, and an assignment rule which specifies which time slots a vehicle is allowed to access based on the cell where it is currently located. Similarly, CDMA is proposed for MAC in VANETs due to its robustness against interference and noise [6], [7]. The main problem which arises with CDMA in VANETs is how to allocate the pseudo noise (PN) codes to different vehicles.…”

Section: Introductionmentioning

confidence: 99%

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VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs

Omar

Zhuang

2013

IEEE Trans. on Mobile Comput.

429

272

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Abstract-The need of a medium access control (MAC) protocol for an efficient broadcast service is of great importance to support the high priority safety applications in vehicular ad hoc networks (VANETs). This paper introduces VeMAC, a novel multichannel TDMA MAC protocol proposed specifically for a VANET scenario. The VeMAC supports efficient one-hop and multi-hop broadcast services on the control channel by using implicit acknowledgments and eliminating the hidden terminal problem. The protocol reduces transmission collisions due to node mobility on the control channel by assigning disjoint sets of time slots to vehicles moving in opposite directions and to road side units. Analysis and simulation results in highway and city scenarios are presented to evaluate the performance of VeMAC and compare it with ADHOC MAC, an existing TDMA MAC protocol for VANETs. It is shown that, due to its ability to decrease the rate of transmission collisions, the VeMAC protocol can provide significantly higher throughput on the control channel than ADHOC MAC.Index Terms-TDMA, medium access control, reliable broadcast, and vehicular ad hoc networks.

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Section: Accessing Slots On the Service Channelsmentioning

confidence: 99%

“…, M 7 . If node x decides 6. An MSDU is a unit of data arriving to the MAC layer entity from the layer above.…”

Section: Accessing Slots On the Service Channelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs

Omar

Zhuang

2013

IEEE Trans. on Mobile Comput.

429

272

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show abstract

“…Such MAC protocols are designed based on channel access schemes such as code division multiple access (CDMA), space division multiple access (SDMA), IEEE 802.11 random access, and time division multiple access (TDMA). MAC protocols based on CDMA channel access [27,28] require each vehicle to have a database of allowable location-specific pseudo-random noise (PN) codes specified in its digital map. In addition, vehicles must be equipped with a large number of match filters, which depends on the length of PN codes.…”

Section: Medium Access Control In Vanetsmentioning

confidence: 99%

Link-Layer Cooperative Communication in Vehicular Networks

Bharati¹

2018

Wireless Networks

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Vehicular ad hoc networks (VANETs) are a special kind of communication networks and possess unique characteristics as compared with general mobile ad hoc networks (MANETs), where vehicles communicate with each other or with stationary road side units. Hence, directly applying the existing communication protocols designed for MANETs may not be reliable and efficient in VANETs. Thus, this thesis presents link-layer cooperative frameworks to improve transmission reliability and network throughput over distributed TDMA MAC 1 protocols for VANETs.We present a link-layer node cooperation scheme for VANETs, referred to as Cooperative ADHOC MAC (CAH-MAC). In CAH-MAC, neighboring nodes cooperate to utilize unused time slots to retransmit failed packets. Throughput improvement is achieved by using idle time slots that are wasted in the absence of node cooperation. In addition, as a packet is retransmitted earlier by a relay node, transmission delay and packet dropping rate are reduced. We study the effects of a dynamic networking environment on the performance of CAH-MAC. It is observed that, system performance degrades due to cooperation collisions. To tackle this challenge, we present an enhanced CAH-MAC (eCAH-MAC) scheme. In eCAH-MAC, using different types of packet and by delaying or suspending some relay transmissions, cooperation collisions can be avoided and cooperation opportunities can be efficiently utilize without disrupting the normal operations of the distributed TDMA MAC.We propose a node cooperation based makeup strategy for vehicular networks, referred to as cooperative relay broadcasting (CRB), such that neighboring nodes proactively rebroadcast the packet from a source node. An optimization framework is developed to provide an upper bound on the CRB performance with accurate channel information. Further, we propose a channel prediction scheme based on a two-state first-order Markov chain, to select the best relaying node for CRB. As packets are repeatedly broadcasted by the neighboring nodes before they expire, the proposed CRB framework provides a more reliable broadcast service as compared with existing approaches.The proposed node cooperation frameworks enhance the performance of distributed TDMA MAC and make it more robust to tackle VANET's dynamic networking conditions.

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“…In [4] and [5], two MAC protocols are proposed based on TDMA. In [6] and [7], CDMA-based MAC protocols are proposed. Among all these MAC protocols, clustering is an effective way to limit channel contention and increase spatial reuse in VANETs.…”

Section: Introductionmentioning

confidence: 99%

A novel cooperative MAC for broadcasting in clustering VANETs

Yang

Tang

Huang

2013

2013 International Conference on Connected Vehicles and Expo (ICCVE)

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In VANETS, a variety of services can be provided, including safety-related applications, traffic management and user infotainment services. Out of all these applications, safetyrelated applications are the most important ones and they mainly depend on the broadcast service. However, it is a challenging task to provide a reliable broadcast in VANETs, because of the mobility of vehicles and the unreliability of wireless channels. On the other hand, cooperative communication has been proved effective to mitigate wireless channel impairments and increase the reliability of communications. In this paper, a cooperative MAC for broadcasting is proposed in clustering VANETs. This MAC can improve the reliability of broadcasting. The performance of this MAC is verified through mathematical analysis and simulations.

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An analysis of incident information transmission performance using MCS/CDMA scheme

Cited by 15 publications

References 3 publications

VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs

VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs

Link-Layer Cooperative Communication in Vehicular Networks

A novel cooperative MAC for broadcasting in clustering VANETs

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