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In 802.11-2012, we have the following definitions: portable station (STA): A type of station (STA) that might be moved from location to location, but that only uses network communications while at a fixed location. mobile station (STA): A type of STA that uses network communications while in motion. With the following discussion of the difference in 4.2.4: One of the requirements of IEEE Std 802.11 is to handle mobile as well as portable STAs. A portable STA is one that is moved from location to location, but that is only used while at a fixed location. Mobile STAs actually access the LAN while in motion. For technical reasons, it is not sufficient to handle only portable STAs. Propagation effects blur the distinction between portable and mobile STAs; stationary STAs often appear to be mobile due to propagation effects. Another aspect of mobile STAs is that they may often be battery powered. Hence power management is an important consideration. For example, it cannot be presumed that a STA’s receiver is always powered on. Not quite what you’re getting at about physical size (with its own implications), but it’s close, and probably something you could build on. Mark -----Original Message----- Hi Folks, As to the usage model 8a, when we talk about portable devices, do we need to seperate mobile devices (small footsize devices, such as cellular phone, Ipod) and normal portable devices (relatively large size devices, tablet pad, laptop, etc.)? As we know, for small footsize devices, antenna array size and power comsuption limitaions/reqirements are quite different from those of large footsize portable devices. Given the boom and diversity of portable devices, maybe it is wise to seperate into two categories (of course how to classify into two categories needs more discussion.) I think these two usage models will affect the function requirements on link budget and performance requirement. It will also may help for future implementation on cost and flexibility. Any thoughts are very welcome. Thanks, Jianhan Liu Mediatek USA _______________________________________________________________________________ If you wish to be removed from this reflector, do not send your request to this reflector - it will have no effect. Instead, go to http://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-tgaj and then press the LEAVE button. Further information can be found at: http://www.ieee802.org/11/Email_Subscribe.html _______________________________________________________________________________ If you wish to be removed from this reflector, do not send your request to this reflector - it will have no effect. Instead, go to http://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-tgaj and then press the LEAVE button. Further information can be found at: http://www.ieee802.org/11/Email_Subscribe.html _______________________________________________________________________________ |