Performance Analysis of ITS V2V Broadcast Communication Using CSMA/CA and a Roadside Relay Station at Intersections

Adachi

Journal of Information Processing

2018

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CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) based relay-assisted V2V scheme is effective in compensating shadowing loss and hence improves performance of ITS V2V communications, especially for non-line-of-sight (NLOS) areas such as intersections. However, when the number of vehicle stations becomes large, packet congestion happens frequently at the relay station (RS). It causes interruption of packet relaying transmission and limits the improvement by the scheme. This paper proposes a packet payload combining relay (PCRL) scheme to alleviate the congestion issue at RS by compressing packet overheads of broadcast packets. With adaptive modulation and coding technique at RS, PCRL can further mitigate the packet interruption by reducing the air time of relayed packets. Time division grouping method is also applied to PCRL to mitigate the hidden terminal problem at intersections. Analyzed and simulated results show that the proposed schemes can effectively mitigate packet congestion issue and improve the reliability of the V2V communication.

Section: Introductionmentioning

confidence: 84%

Section: Mac Layer Service Time Of Rsmentioning

confidence: 99%

See 1 more Smart Citation

Efficient CSMA/CA Packet Relay-Assisted Scheme with Payload Combining for ITS V2V Communication

Adachi

Journal of Information Processing

2018

Self Cite

“…Since the RS is located at the intersection to be line-of-sight (LOS) to the vehicles, and the antenna height of the RS can be as high as traffic lights, the path loss between RS and vehicles are small. Effectiveness of the relaying scheme has been shown in some works by theoretical analysis and computer simulations [4][5].…”

Section: Introductionmentioning

confidence: 99%

Packet Combining Relay Scheme with Sectorized Relay Station for Reliable ITS V2V Communication

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

2015

Self Cite

Vehicle-roadside-vehicle relaying scheme has been studied as an effective means for improving the reliability of ITS V2V communication at intersection. However, hidden terminal (HT) problem that is caused by non-line-of-sight (NLOS) propagation at the intersection severely deteriorates packet reception at relay station (RS), which reduces the gain of relaying scheme. On the other hand, relaying increases air traffic, which results in interruption of packet transmission when the number of vehicles is large. In order to mitigate these two issues and achieve higher communication reliability, an improved packet payload combining relay scheme with sectorized RS (S-PCRL) is proposed. Simulated results show that the proposed scheme can effectively mitigate the issues and remarkably improve the reliability of ITS V2V communication at intersection environment with up to three hundreds of vehicles.

“…Since the RS is located at the intersection to be line of sight (LOS) to the vehicles, and the antenna height of the RS can be as high as traffic lights, the path loss between RS and vehicles are small. Its effectiveness has been shown in some works by theoretical analysis and simulations [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An investigation of network coding relay in its V2V communication at intersections

2014 4th IEEE International Conference on Network Infrastructure and Digital Content

2014

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Vehicle-to-vehicle (V2V) communication is regarded as an essential means to avoid traffic accidents and enhance vehicle safety. However, reliability of the communication severely suffers from wireless propagation on the road such as fading and shadowing. Vehicle-roadside-vehicle relay communication schemes have been proposed to improve the reliability of the V2V communication. Although the scheme can ease fading and compensate shadowing loss for intersection environments, it increases airtime occupancy ratio which results in more chances of packet collisions. This paper proposes a network coding broadcast relay scheme considering the location of transmitting vehicle stations. It can reduce the air traffic caused by relaying and improve the performance of V2V communication. Simulated results show that the proposed scheme can effectively reduce airtime occupancy ratio under intersection environment and improve the performance of relaying for high traffic conditions.