tailieunhanh - Artificial Intelligence for Wireless Sensor Networks Enhancement Part 14

Tham khảo tài liệu 'artificial intelligence for wireless sensor networks enhancement part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Technologies and Architectures for Multimedia-Support in Wireless Sensor Networks 379 short summary and use cases for them are given in the following section. For more comparisons see also Sidhu et al. 2007 . ZigBee is meant to target scalar sensors and the remote control market with very low power consumption and very little communication. ZigBee does not allow streaming of any mm data. Bluetooth allows interoperability and the replacement of cables and targets on wireless USB hand- and headsets so that audio-streaming is supported. Figure 4 shows a comparison of ZigBee and Bluetooth based on the well-known OSI-Reference-Model-Layers. Wi-Fi is designed for computer networks and allows high data rates but it needs a lot of energy and is quite expensive in hardware costs. Wi-Fi allows even video-streaming in high quality. However even scalar nodes such as the Tag4M Ghercioiu 2010 Folea Ghercioiu 2010 Ursutiu et al. 2010 use Wi-Fi because of its wide availability and good integration into the Internet. Table 3 shows all technical details in a comparison of the presented technologies. Summary Technology Theoretical Data Rate Mb s Output Power mW Free-Space Range m Frequency Band GHz IEEE 1 100 Bluetooth 1-2 100 100 IEEE 54 40 - 800 120 5 IEEE 11 200 140 IEEE 54 65 140 Table 3. Survey of common transfer technologies. Properties are the theoretical values defined by the standard. The low bandwidth of the nodes is a problem for streaming media in the network. Live uncompressed video streaming with meaningful resolutions is often impossible. All given transfer rates are the theoretical maximum of the different standards. The real transfer rates will be much slower because of necessary calculations for sending wrapping to layers and interference on the communication channel. A single-hop communication between a SunSPOT sensor node and the SunSPOT base station can be mentioned as a real world example. .