HETEROGENEOUS NETWORK
The concept of having several users, which are collectively on the move forming a group with different access standards into this group, is called Collectively Mobile Heterogeneous Network (CMHN). In such a scenario [5] one can find two types of mobility and two types of heterogeneity: the mobile group itself and the user mobility inside the group from one side, and heterogeneous access segments and heterogeneous user access standards from the other side. The aircraft cabin represents a CMHN (see Fig. 1) supporting three types of wireless (user mobility) access standards (heterogeneous user access) inside an aircraft (the mobile group) using one or more satellite access segments. The CMHN may cross coverage areas and then inter-/ intra- satellite handover will be required. The communication infrastructure to support the cabin CMHN is depicted in Fig 2. The architecture consists of (i) several wireless access segments in the aircraft cabin which can coexist with the standard wired IP LAN, (ii) a satellite segment for interconnection of the cabin with the terrestrial telecom networks, and (iii) an aircom service provider segment supporting the integrated cabin services.
Figure 4.CMHN system architecture
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9.CONCLUSION
Go meet the increasing and ever changing needs of the most demanding passengers a solution in which passengers, both business and economy, could use their own wireless equipment must be developed. This approach has many advantages. From the users point of view, their service acceptance will be increased by the following facts: they can be reached under their usual telephone number, they may have available telephone numbers or other data stored in their cell phones or PDAs, their laptops have the software they are used to, the documents they need and with their personalized configuration (starting web site, bookmarks, address book). In addition, since users in an aircraft are passengers, the electronic devices they carry with them is wireless, like laptops with WLAN interface. From the airlines point of view there is a huge saving of the investment that would suppose the installation of terminals (screens, stations, wired telephones), the consequent software licenses (in case of PCs) and the further investment due to hardware updating to offer always last technology to their customers. Currently, one of the major IFE costs is due to film copies and delivery expenses of new movies. This could be reduced if other broadband services were offered to passengers via satellite. Anyway, the wireless access solution is not replacing other kinds of IFE, such as TV on board or provision of Internet access with dedicated installed hardware in the cabin seats. Hence, it should not be seen as an alternative to a wired architecture in aircraft, but as an added service for passengers.
REFERENCE
· Passenger Multimedia Service Concept Via Future Satellite System By A. Jahan, M. HolzbockInstitute of Communication and Navigation, Germany
· IEE Communication Magazine, July 2003
· www.inmarsat.com/swift64
· www.wirelesscabin.com
· Wireless mobile communication by William Feher
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1 comment:
I so agree with you.
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