Collision-free operation in ad hoc carrier sense multiple access wireless networks

2002 ◽  
Vol 6 (8) ◽  
pp. 352-354 ◽  
Author(s):  
C. Papachristou ◽  
F.N. Pavlidou
Keyword(s):  
Wireless Networks ◽  
Multiple Access ◽  
Ad Hoc ◽  
Carrier Sense Multiple Access ◽  
Carrier Sense

Synchronous Relaying in Vehicular Ad-hoc Networks

2011 ◽  
Vol 1 (2) ◽  
pp. 36-41
Author(s):  
D. Moltchanov ◽  
A. Vinel ◽  
J. Jakubiak ◽  
Y. Koucheryavy
Keyword(s):  
Ad Hoc Networks ◽  
Multiple Access ◽  
Information Dissemination ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Ieee 802.11P ◽  
Carrier Sense Multiple Access ◽  
Carrier Sense ◽  
Wireless Medium ◽  
Hoc Networks

In this paper, the authors propose a simple concept for emergency information dissemination in vehicular ad-hoc networks. Instead of competing for the shared wireless medium when transmitting the emergency information, the authors’ proposed method requires nodes to cooperate by synchronizing their transmissions. The proposed scheme is backward compatible with IEEE 802.11p carrier sense multiple access with collision avoidance. The authors also briefly address some of the implementation issues of the proposed scheme.

scholarly journals A CSMA Mechanism with Variable Collision Control and Priority Provision in Multichannel Mobile Ad Hoc Networks

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Hongwei Ding ◽  
Mingliang Li ◽  
Jun Zhang
Keyword(s):  
Multiple Access ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Packet Transmission ◽  
Utilization Rate ◽  
Joint Control ◽  
Carrier Sense Multiple Access ◽  
Network Systems ◽  
Carrier Sense ◽  
Mobile Ad Hoc

Toward making the conventional carrier sense multiple access (CSMA) protocol transmit and control mobile ad hoc network systems, as well as reducing energy consumption, an adaptive multichannel multipriority two-dimensional probability detection and 1-stick joint control strategy carrier sense multiple access with variable collision duration and three-way handshake mechanisms (iCSMA for short) is proposed. Based on the conventional two-slot model of the CSMA protocol, iCSMA introduces a concept of collision duration (b), which divides the system’s timeslot into the duration of successful packet transmission (1 + a), the duration of collision (b + a), and the duration of the idle state (a) of the system. By employing iCSMA, the loss of the system could be reduced with a fine-tuned collision duration (b), which leads to improved performance compared to the conventional 1P-persistent CSMA protocol. Furthermore, a three-way handshake mechanism is introduced for monitoring the entire network system at a minimal cost of throughput. Toward a higher channel utilization rate, a multichannel and multipriority function is employed in the implementation of multiservice communication for the system. Besides, with an adaptive mechanism, the transmission probabilities p 1 and p 2 are reasonably set so that the system will not produce a complete collision under the condition of high load, and the throughput can also be stabilized. Based on the battery model, the lifetime of the system nodes (T) is extended. Both theoretical analysis and experimental results confirm the accuracy of the theoretical derivation.

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