Personal area network (PAN) technology, local area networks, metropolitan area networks, wide area networks.
- Personal Area Network (PAN) technology, the four core personal area network technology
capable of short-range communication network between the portable consumer electronics and communications devices. Its coverage is generally within 10 m radius. PAN advantage lies in: it can automatically detect any fall within the POS devices in a transparent and seamless manner and establish a connection. PAN is usually only a few meters, but it is very effective, because personal needs rarely exceed this distance.
There are a variety of techniques to achieve the PAN, mainly Bluetooth, IrDA, HomeRF and UWB (Ultra-Wideband Radio) these four technologies.
1.IrDA using infrared technology is a point to point communication, the mobile communication device having a small required volume, low-power, low power consumption characteristics in the art. Transmission rate is the highest of the four techniques, the use of point to point connection, data transmission subject to less interference, a rate of up to 16Mb / s. However, IrDA is a line of sight transmission technique, that is to say between the two devices has a transmission of data IrDA port, can not have the intermediate barrier, between the two devices which are easy to implement, but a plurality of The electronic device must be adjusted between the position and angle to each other. Further, the core member IrDA infrared LED device is not a durable, often use mobile Internet if the IrDA port assembly may quickly overwhelmed.
2.HomeRF is designed specifically for home users. HomeRF use frequency hopping spread spectrum to realize communication, either by time division multiplexing to support voice communications between mobile data and voice devices via a host family, but also to avoid protocol sense multiple access / collision by providing data communications carrier service. HomeRF is a combination of DECT and IEEE 802.11, aimed at reducing the cost of voice data, using spread spectrum technology, working in the 2.4GHz band, synchronization can support high-quality voice channels 4, HomeRF current transmission rate can reach 11Mb / s.
3. The Bluetooth technology is an open global specification networking personal area network, which is part of the user or neighboring piconet wireless device used, the communication distance is 10m standard configuration, when an external power amplifier, a communication distance can be expanded to 100m. Various mobile devices can be registered in a plurality of piconets, and in one piconet at any time the mobile device can use eight kinds.
WPAN (Wireless Personal Area Neawork, WPAN) refers to a special short-range network for connection between the portable communication apparatus and consumer electronics. WPAN coverage is generally within a radius of 10m, smaller than the wireless LAN. Special connector comprising two meanings, one refers to both devices assume the master function, but also the ability to assume the functions controlled; the second refers to the ease of the device to join or leave the existing network.
Bluetooth PAN stands for: Bluetooth Personal Area Networking, Bluetooth personal area network, is an important application of Bluetooth technology, the core idea is to use Bluetooth wireless technology to replace traditional wired cable, set up personalized information network, resources and scope of personal information share (that is, a network share).
The main scenarios: network sharing between mobile phones and mobile phone, PC to PC, PC and mobile phone.
Three roles:
NAP (Network Access Point): If your Bluetooth device supports NAP, then you can give other PC within the PAN Network provides Internet access over a shared network connection.
GN (Group Ad-hoc Network) : You can provide the data forwarding functionality in a small local area network to other devices.
PANU (PAN User): the role of the NAP, GN contrast, use of equipment NAP, GN functionality provided.
Android supports the NAP and as PANU role.