Table of contents
Wireless local area network is a local area network using wireless communication technology
Wireless LAN Features
- Provides mobile access functionality
- Save investment and build a network faster
- Support portable device networking
Composition of wireless LAN
Portable station: easy to move, but stays in place while you work
Mobile station: Not only can move, but also can communicate while moving
Wireless LAN Classification
Wireless LAN can be divided into two categories
- WLAN with fixed infrastructure
- WLAN without fixed infrastructure
Fixed infrastructure refers to a group of fixed base stations that have been established in advance and can cover a certain geographical area.
IEEE 802.11
IEEE 802.11 is an international standard for wireless local area networks with fixed infrastructure and is the standard for wireless Ethernet
- Using a star topology, the center is called the access point AP (Access Point)
- Using the CSMA/CA protocol at the MAC layer
Any local area network that uses 802.11 series protocols is also called Wi-Fi (Wireless-Fidelity, meaning wireless fidelity
hot spot
Hotspots are public wireless access points
The area connected by many hotspots and APs is called a hot zone (hot zone)
Users can access to the wireless Internet service provider WISP (Wireless Internet Service Provider) through the wireless channel, and then access to the Internet through the wireless channel
mobile ad hoc network
Mobile ad hoc network is also called ad hoc network
An ad hoc network is a wireless local area network without a fixed infrastructure (that is, without APs)
This network is a temporary network composed of some mobile stations in an equal state to communicate with each other
- The service range of the mobile ad hoc network is limited, and it is generally not connected to other external networks
- mobile ad hoc network
WSN
Wireless sensor network (WSN) is an ad hoc network composed of a large number of sensor nodes through wireless communication technology.
The application of wireless sensor network is to collect, process and transmit various data
features
- Does not require high bandwidth, must keep power consumption low
- There are strict restrictions on the size of the protocol stack
- There are certain requirements for network security, node automatic configuration, network dynamic reorganization, etc.
Mobile ad hoc network is different from mobile IP
several different access
