Priority Collision Resolution - Distributed Coordination Function for Distributed Wireless Networks

2007 ◽  
Author(s):  
Xiaohui Ye ◽  
Xin Liu ◽  
S. J. Ben Yoo ◽  
Zhi Ding
Keyword(s):  
Wireless Networks ◽  
Collision Resolution ◽  
Distributed Coordination ◽  
Distributed Coordination Function ◽  
Coordination Function

Interconnection Issues in CPS

2015 ◽  
pp. 61-75
Keyword(s):  
Wireless Networks ◽  
Mobile Networks ◽  
Ad Hoc ◽  
Multicast Routing ◽  
Distributed Coordination ◽  
Multicast Communication ◽  
Distributed Coordination Function ◽  
Network Properties ◽  
Hoc Networks ◽  
Coordination Function

This chapter shows the interconnection issues in different wireless networks such as ad hoc networks and sensor networks. It also specifies the need for multicast routing protocols in mobile networks, because these wireless networks are suitable for multicast communication due to its inherent transmission ability. Based on the area to be covered, mechanism used for sensor deployment, and various properties of sensor network properties, different coverage formulations have been suggested. In addition, several constructions reachable areas and their expectations along with an outline of the explanations are described. Though 802.11 planned for organization-based systems, the Distributed Coordination Function (DCF) offered in 802.11 permits mobile networks to communicate with the channel exclusive of the base location. Several performance issues related to IEEE 802.11 are revealed. This chapter identifies the main reasons for performance losses and provides solutions for the scenarios that are specific to certain issues related to CPS.

Improving WLAN Performance by Modifying an IEEE 802.11 Protocol

2013 ◽  
pp. 15-32
Author(s):  
Nurul I. Sarkar
Keyword(s):  
Ieee 802.11 ◽  
Ad Hoc ◽  
Packet Delay ◽  
Distributed Coordination ◽  
Bandwidth Utilization ◽  
Medium Access ◽  
802.11 Dcf ◽  
802.11 Networks ◽  
Distributed Coordination Function ◽  
Coordination Function

One of the limitations of the IEEE 802.11 distributed coordination function (DCF) protocol is its low bandwidth utilization under medium-to-high traffic loads resulting in low throughput and high packet delay. To overcome performance problems, traditional IEEE 802.11 DCF (“DCF”) protocol is modified to the buffer unit multiple access (BUMA) protocol. The BUMA protocol achieves a better system performance by introducing a temporary buffer unit at the medium access control (MAC) layer to accumulate multiple packets and combine them into a single packet (with a header and a trailer) before transmission. This paper provides an in-depth performance evaluation (by simulation) of BUMA for multiuser ad hoc and infrastructure networks. Results obtained show that the BUMA is more efficient than that of DCF. The BUMA protocol is simple and its algorithm (software) can be upgraded to 802.11 networks requiring no hardware changes. The BUMA protocol is described and simulation results are presented to verify the performance.

Distributed Approach for QoS Guarantee to Wireless Multimedia

2007 ◽  
pp. 195-201
Author(s):  
K. Chetan ◽  
P. Venkataram ◽  
R. Sircar
Keyword(s):  
Ieee 802.11 ◽  
Wireless Multimedia ◽  
Distributed Coordination ◽  
Access Method ◽  
Qos Guarantee ◽  
Distributed Approach ◽  
Research Areas ◽  
Distributed Coordination Function ◽  
Active Research ◽  
Coordination Function

Providing support for QoS at the MAC layer in the IEEE 802.11 is one of the very active research areas. There are various methods that are being worked out to achieve QoS at MAC level. In this article we describe a proposed enhancement to the DCF (distributed coordination function) access method to provide QoS guarantee for wireless multimedia applications.

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