How can hidden terminals be detected in 802.11

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In such a case, if one station wants to transmit data, there is a fear of collision from the other station i. Which one of the following event is not possible in wireless LAN? Explanation: Collision detection is not possible in wireless LAN with no extensions. A problem that manifests in wireless networks where some of the nodes are unaware of each other.

Which of these is not applicable for IP protocol? Explanation: IP does not provide reliable delivery service for the data. It can be conceived as a set of laptops and other wireless devices communicating by radio signals. Users connected by WLANs can move around within the area of network coverage.

The mode that is used for installing networks in the wireless communication device is fixed and wired. A wireless network refers to a network that uses wireless data connections between nodes of networks. Why the shape of cell is not circle?

Explanation: Circle is the first natural choice to represent the coverage area of a base station. But while adopting this shape, adjacent cells cannot be overlaid upon a map without leaving gaps or creating overlapping regions. What is the condition for handoff? Explanation: Handoff occurs when a mobile moves into a different cell while a conversation is in progress. The MSC automatically transfers the call to a new channel belonging to the new base station.

The IEEE In ad hoc mode, mobile units transmit directly peer-to-peer. In infrastructure mode, mobile units communicate through a wireless access point WAP that serves as a bridge to other networks such as the Internet or a local area network. In essence, This will allow all devices to connect to this network. Ideally, the 2. Given the same levels of noise, a weaker signal results in a lower SNR signal-to-noise ratio and a lower quality connetcion.

This can limit an access points reach inside buildings like homes and offices where many walls may come between a wireless antenna and the user. Both 5GHz and 2. It is perfectly safe. This thesis describes new methods for the detection and measurement of the hidden terminal problem in wireless networks based on commodity hardware and software platforms.

These new methods allow network operators to identify areas of a network where hidden terminals are likely to exist; detect instances of the hidden terminal problem occurring; and estimate the total impact hidden terminals are having on the performance of the network. A new framework for measurement of wireless networks is described which provides a new approach to wireless measurement on Linux based wireless routers. The new framework is used to implement the methods and they are deployed across an operational commercial wireless network and are shown to be useful.

Type Thesis. Publisher University of Waikato. Rights All items in Research Commons are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.