当前位置: X-MOL 学术EURASIP J. Wirel. Commun. Netw. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A hybrid access method for broadcasting of safety messages in IEEE 802.11p VANETs
EURASIP Journal on Wireless Communications and Networking ( IF 2.6 ) Pub Date : 2021-04-01 , DOI: 10.1186/s13638-021-01933-3
Xiaoying Lei , Xiangjin Chen , Seung Hyong Rhee

Vehicular Ad-hoc Networks (VANETs) can improve the road safety by transmitting safety-critical messages such as beacons and emergency messages. IEEE 802.11p VANETs have adopted the carrier sense multiple access with collision avoidance (CSMA/CA) mechanism for the multiple access control. The 802.11p media access control (MAC) protocol, however, can not guarantee the reliability of broadcasting data, since the reception of transmitted messages are not acknowledged. Moreover, the backoff scheme of the 802.11p MAC utilizes a fixed-size contention window for safety message broadcasting, which causes high collision probabilities especially in dense environments. In order to improve such drawbacks, we propose a hybrid access method as follows: Nodes are equipped to reserve time slots for the next round of broadcasting, while unoccupied time slots are preserved for those which have emergency needs. In addition, implicit feedbacks are enabled for detecting collisions incurred during random channel accesses in preserved time slots. We devise a mathematical model which optimally controls the parameters of our scheme while minimizes the cost caused by idle channels and collisions. Extensive simulations show that our mechanism can remarkably improve the performance of VANETs in broadcasting of the safety messages.



中文翻译:

在IEEE 802.11p VANET中广播安全消息的混合访问方法

车载自组织网络(VANET)可以通过传输对安全至关重要的消息(如信标和紧急消息)来改善道路安全。IEEE 802.11p VANET已将具有冲突避免功能的载波侦听多路访问(CSMA / CA)机制用于多路访问控制。但是,802.11p媒体访问控制(MAC)协议不能保证广播数据的可靠性,因为未确认所传输消息的接收。此外,802.11p MAC的退避方案利用固定大小的争用窗口进行安全消息广播,这会导致较高的冲突概率,尤其是在密集环境中。为了改善这些缺点,我们提出了一种混合访问方法,如下所示:节点具有为下一轮广播保留时隙的能力,而空闲的时隙则保留给那些有紧急需求的时隙。另外,启用隐式反馈以检测在保留的时隙中在随机信道访问期间发生的冲突。我们设计了一个数学模型,该模型可以最佳地控制我们的方案的参数,同时最大程度地减少由空闲信道和冲突引起的成本。大量的仿真表明,我们的机制可以显着提高VANET在安全消息广播中的性能。

更新日期:2021-04-01
down
wechat
bug