scholarly journals Access Control and Handover Strategy for Multiple Access Points Cooperative Communication in Vehicle Environments

10.5772/55401 ◽  
2013 ◽  
Author(s):  
Xiaodong Xu
Keyword(s):  
Access Control ◽  
Cooperative Communication ◽  
Multiple Access ◽  
Access Points

A collision feedback based multiple access control protocol for very high frequency data exchange system in E-navigation

2021 ◽  
pp. 1-16
Author(s):  
Xu Hu ◽  
Bin Lin ◽  
Ping Wang ◽  
Hongguang Lyu ◽  
Tie-Shan Li
Keyword(s):  
Access Control ◽  
High Frequency ◽  
Multiple Access ◽  
Data Exchange ◽  
High Frequency Data ◽  
Frequency Data ◽  
Exchange System ◽  
Very High Frequency ◽  
Time Division ◽  
Very High

Abstract The very high frequency data exchange system (VDES) is promising in promoting electronic navigation (E-navigation) and improving navigation safety. The multiple access control (MAC) protocol is crucial to the transmission performance of VDES. The self-organising time division multiple access (SOTDMA) protocol, as the only access mode given by current recommendations, leads to a high rate of transmission collisions in the traditional automatic identification system (AIS), especially with heavy traffic loads. This paper proposes a novel feedback based time division multiple access (FBTDMA) protocol to address the problems caused by SOTDMA, such that collision of transmissions can be avoided in information transmission among vessels. Simulation results demonstrate that the proposed FBTDMA outperforms the traditional SOTDMA in terms of channel utilisation and throughput, and significantly reduces the transmission collision rate. The study is expected to provide insights into VDES standardisation and E-navigation modernisation.

scholarly journals Distributed user-to-multiple access points association through deep learning for beyond 5G

2021 ◽  
pp. 108258
Author(s):  
Thi Ha Ly Dinh ◽  
Megumi Kaneko ◽  
Keisuke Wakao ◽  
Kenichi Kawamura ◽  
Takatsune Moriyama ◽  
...  
Keyword(s):  
Deep Learning ◽  
Multiple Access ◽  
Access Points

A Flexible Authorization Framework

2004 ◽  
pp. 149-176
Author(s):  
Duminda Wijesekera ◽  
Sushil Jajodia
Keyword(s):  
Access Control ◽  
Multiple Access ◽  
Rule Base ◽  
Multiple Access Control ◽  
Control Policies ◽  
Workflow Systems ◽  
Access Control Policies ◽  
New Challenges

Advances in application areas such as Internet-based transactions, cooperating coalitions, and workflow systems have brought new challenges to access control. In order to meet the diverse needs of emerging applications, it has become necessary to support multiple access control policies in one security domain. This chapter describes an authorization framework, referred to as the Flexible Authorization Framework (FAF), which is capable of doing so. FAF is a logic-based framework in which authorizations are specified in terms of a locally stratified rule base. FAF allows permissions and prohibitions to be included in its specification. FAF specifications can be changed by deleting and inserting its rules. We also describe FAF’s latest additions, such as revoking granted permissions, provisional authorizations, and obligations.

Sign in / Sign up

Export Citation Format

Share Document